Circuit | Category | Date Added | OK? | Votes | |
13.8V 30-40A Power Supply (PDF) | Power | | | 86 |
|
Yaesu FT-897 - PC interface (PDF) | PC | | | 3 |
|
AT89C2051 serial COMs to LED driver | Microcontroller | Apr 12, 2001 | | 16 |
|
RCM710 electronic scale, technical manual including schematic | Test | Apr 12, 2001 | | 2 |
|
RS-232 line monitor and loopback cables | PC | Jan 26, 2001 | | 3 |
|
Serial to parallel converter using the AT89C2051 | Microcontroller | Jan 26, 2001 | | -1 |
|
Slave flash trigger with counting logic (Silicon Chip Mazine article) | Photo | Aug 18, 2009 | | 2 |
|
Filters for the RadioJove Receiver | Filter | | | 0 |
|
Autopilot: Do it yourself UAV | Models | Sep 10, 2006 | | 7 |
|
Bridge head | Control | Aug 14, 2002 | | -6 |
|
Bat detector microphone pre-amplifiers | Preamp | | | 8 |
|
Visor cradle serial interface | Games | Aug 09, 2002 | | -1 |
|
TomTom One V3 connector pinout | PDA | Mar 27, 2009 | | -1 |
|
Simple CW Keyer based on Atmel ATtiny 2313 | Microcontroller | | | -1 |
|
PWM motor controller | Control | Jun 06, 2003 | | -1 |
|
Single and Two Cell White LED Drivers Without Inductors | LED | Sep 13, 2006 | | 2 |
|
Laser link communicator project from Electronics Australia magazine | Laser | | | 2 |
|
12V battery level indicator for car batteries | Automotive | | | 9 |
|
Bicycle rear flashing LED light | LED | | | 4 |
|
Car burglar alarm circuit | Automotive | | | 2 |
|
Decision maker circuit diagram | Games | | | 2 |
|
Egg timer circuit diagram, PCB layout and assembly information | Timing | | | 1 |
|
Electronic candle | Lighting | | | 8 |
|
Flashing light / emergency beacon for vehicle | Automotive | | | -1 |
|
3-up decision maker circuit diagram | Games | | | 3 |
|
Headlight guard | Automotive | | | 3 |
|
LED dice with fast roll | Games | | | 5 |
|
Interior light extender | Automotive | | | -2 |
|
Little bike light using LEDs | LED | | | 1 |
|
Simple metronome using LM1458 | Music | | | 4 |
|
LED dice using PIC16F88 | Games | | | 1 |
|
Simple moisture indicator | Misc | | | -4 |
|
LM380 2.5 watt audio amplifier circuit | Amplifiers | | | 38 |
|
One transistor FM transmitter / FM bugging device | Transmitters | | | 5 |
|
Two player quiz master game | Games | | | -2 |
|
4 channel 433MHz remote control transmitter / receiver based on SM5162 and SM5172 chips | RF | | | 13 |
|
Seatbelt reminder circuit | Automotive | | | 4 |
|
Solar tracker | Solar | | | -1 |
|
Stereo audio amplifier based on TDA2822M | Amplifiers | | | -9 |
|
Two LED trouble light system | Automotive | | | -1 |
|
Two-tone doorbell using 555 timer | Misc | | | -4 |
|
Two transistor FM transmitter / FM bug | Transmitters | | | 1 |
|
Snore alarm electronic device | Medical | Aug 14, 2002 | | 5 |
|
Car Ignition Coil Driver from 110V AC | Power | Sep 23, 2009 | | -10 |
|
Laser beam alarm system | Laser | | | -10 |
|
Amplified zener regulator | Power | | | -4 |
|
13.5 Watt Power Amplifier using a TL081 opamp and TIP125 / TIP120 power transistors | Amplifiers | | | -11 |
|
Momentary High Voltage Arc Circuit - can be used to Ignite a barbeque or a Gas in a Potato Gun | Misc | | | 3 |
|
Simple car battery voltage monitor | Automotive | | | 0 |
|
Car Battery Charger, an SCR Design with a 10 Amp rating | Automotive | | | -6 |
|
Car Ignition Coil Driver from 12V DC - Can be used as an electric fence | Power | Sep 23, 2009 | | 3 |
|
Cat or Dog Detector - can be used to control entry on a Cat or Dog Door | Misc | | | -1 |
|
Battery Charger, Current and Voltage Regulated for Sealed Lead Acid batteries | Power | | | -7 |
|
Digital Up / Down Counter with 7-segment display | LED | | | -2 |
|
Delayed Power Circuit using an SCR | Control | | | 3 |
|
LED flasher with "Rising and Falling" Brightness | LED | Sep 23, 2009 | | 0 |
|
Ground Fault Indicator | Test | | | -5 |
|
H-Bridge Circuit | Control | | | 0 |
|
12 Volt Knight Rider LED display | LED | Sep 23, 2009 | | -5 |
|
Digital combination lock using pair of CD4013 CMOS chips | Alarms | Sep 23, 2009 | | -4 |
|
Low battery cut-off circuit for a car or truck | Automotive | Sep 23, 2009 | | 2 |
|
Fish caller circuit | Misc | Sep 23, 2009 | | -2 |
|
Parabolic microphone project circuit (can be used with shotgun directional microphone also) | Audio | Sep 23, 2009 | | 0 |
|
Voltage and current regulated power supply | Power | Sep 23, 2009 | | -3 |
|
High current PWM controller based around a 555 timer | Control | Sep 23, 2009 | | -1 |
|
Electronic roulette wheel circuit diagram | Games | Sep 23, 2009 | | -3 |
|
SCA Adapter - listen to advertisement free background music on FM broadcast radio | RF | Sep 23, 2009 | | 6 |
|
Simple Sine Wave Oscillator including a PCB layout | Timing | Sep 23, 2009 | | -6 |
|
Solar cell battery charger circuit diagram | Solar | Sep 23, 2009 | | -6 |
|
Using a speaker as a microphone - impedance matching circuit | Audio | Sep 23, 2009 | | -1 |
|
Sound pressure level meter | Test | Sep 23, 2009 | | -1 |
|
Powerful stun gun / taser circuit diagram | Misc | Sep 23, 2009 | | -1 |
|
Simple switching power supply (mains operated) | Power | Sep 23, 2009 | | 3 |
|
Relatively simple thermostat circuit diagram | Control | Sep 23, 2009 | | -1 |
|
Electric heater thermostat | Control | Sep 23, 2009 | | -2 |
|
TENS Circuit diagram for muscle stimulation | Medical | Sep 23, 2009 | | 5 |
|
12 Volt Switching Power Supply circuit diagram and PCB layout | Power | Sep 23, 2009 | | -6 |
|
Ultrasonic sound detector / sniffer | Misc | Sep 23, 2009 | | -1 |
|
Simple voltage booster based on Linear Technologies LT1372, includes PCB design | Power | Sep 23, 2009 | | -1 |
|
True RMS Watt Meter | Test | Sep 23, 2009 | | -1 |
|
Two transistor FM transmitter circuit diagram and PCB layout | Transmitters | Sep 23, 2009 | | -7 |
|
Making a bistable from a normal relay, based on coil hysteresis | Control | Jul 21, 2013 | | -2 |
|
Two-button control for dangerous machines | Control | Oct 05, 2012 | | 1 |
|
Bicycle LED POV (persistence of vision display) LED display | LED | | | -1 |
|
GSM-900 Mobile Jammer Book (PDF compressed with WinRAR) | Telephone | Aug 01, 2010 | | -2 |
|
Alkaline battery charger | Power | Dec 02, 2002 | | 0 |
|
PIC16F628 controlled FLL (Frequency Locked Loop) VFO for HF (PDF) | Microcontroller | Oct 05, 2009 | | 2 |
|
Direct Digital Synthesis VFO for HF Bands - based on Analog Devices AD7009 DDS (PDF) | Timing | Oct 05, 2009 | | -1 |
|
Simple Frequency Reader for conversion VFOs | Misc | Oct 05, 2009 | | 2 |
|
The u-counter, a PIC based programmable frequency meter (PDF) | Test | Oct 05, 2009 | | 2 |
|
Continuous Coverage V.F.O. for H.F. (PDF) | Timing | Oct 05, 2009 | | -2 |
|
Experimental DSB/CW QRP rig for 20 and 40 meter bands (PDF) | RF | Oct 05, 2009 | | 0 |
|
PIC16F84 CW decoder (PDF) | Microcontroller | Jul 10, 2002 | | 0 |
|
Simple 40 meters CW QRP Transceiver (PDF) | RF | Oct 05, 2009 | | 1 |
|
20 meters CW QRP Transceiver (PDF) | RF | Oct 05, 2009 | | -3 |
|
Heathkit modulated HeNe laser power supply kit (HK-HI1) | Laser | | | 3 |
|
Easy Xenon DC-DC Converter using LM386 | Lighting | | | 1 |
|
Large collection of strobe / photoflash circuit diagrams | Photo | Sep 01, 2009 | | -1 |
|
Slave Flash Trigger Circuit | Photo | | | -1 |
|
Car power supply unit for digital projects, small car PCs etc | Automotive | | | 0 |
|
Atmel AVR ATtiny45 development board | Microcontroller | Jun 28, 2011 | | 0 |
|
RGB pattern generator based on an Atmel ATtiny2313 running at 20MHz | Video | Jun 28, 2011 | | 1 |
|
Simple RS232 Level Converter based on a MAX232 including Eagle PCB and schematic files | PC | Jun 28, 2011 | | -2 |
|
AVR thermometer / thermostat based on an Atmel ATtiny2313 | Microcontroller | Jun 28, 2011 | | -1 |
|
PCB exposure countdown timer based on an Atmel ATtiny2313 | Timing | Jun 28, 2011 | | 1 |
|
VCR ping pong game | Games | Apr 27, 2004 | | 2 |
|
Video ping pong game | Games | Jul 10, 2002 | | 0 |
|
Video Clock Superimposer | Video | Jul 10, 2002 | | 1 |
|
Video clock superimposer using PIC16C711 | Video | Apr 27, 2004 | | -2 |
|
Eddie's Composting Loo fan controller | Misc | Mar 09, 2012 | | 0 |
|
Dual LED dice (available in kit form) | Games | | | 0 |
|
Single LED dice kit circuit diagram | Games | | | -1 |
|
Precision Digital Altimeter | Data Acquisition | May 01, 2004 | | 1 |
|
Highly accurate constant current source using LM4140, OP777 and MOSFET | Power | Mar 17, 2014 | | -2 |
|
MOSFET based H-Bridge controller for DC motors | Control | Mar 17, 2014 | | 4 |
|
Transistor delay circuits to detect if a door is open for a long period | Alarms | Jun 24, 2015 | | 2 |
|
Interfacing a DSLR Hotshoe to an Arduino | Arduino | Mar 27, 2014 | | 6 |
|
Single supply op-amp audio amplifier | Amplifiers | Jun 24, 2015 | | -6 |
|
USB 0-500MHz RF Power Meter based on a AD8307 | RF | Feb 21, 2013 | | -3 |
|
Serial LCD controller using a PIC16F628 | Microcontroller | | | 3 |
|
Advanced LED temperature indicator | LED | Oct 25, 2014 | | 4 |
|
Simple AM transmitter using a BFW10 FET | Transmitters | Dec 07, 2014 | | 3 |
|
Clap operated remove control for fans | Control | Dec 07, 2014 | | 0 |
|
Dry cell battery charger | Power | Dec 07, 2014 | | 4 |
|
Electronics Cricket on board | Games | Mar 23, 2015 | | 3 |
|
Electronics Lucky Number | Games | Oct 25, 2014 | | 1 |
|
Simple FM receiver based on a TEA5591 IC | RF | Mar 23, 2015 | | -6 |
|
Long Time Period Automatic Timer | Timing | Oct 25, 2014 | | -2 |
|
Microprocessor based home security system | Microcontroller | Oct 25, 2014 | | 1 |
|
PC-based candle ignitor (parallel port based design) | PC | Dec 07, 2014 | | 0 |
|
PC-Based DC Motor Speed Controller | PC | Oct 25, 2014 | | -3 |
|
Power Supply Resumption Alarm using 555 timer | Power | Oct 25, 2014 | | -4 |
|
Presure based hit switch | Control | Dec 07, 2014 | | -1 |
|
Sensitive Optical Burglar Alarm | Alarms | Oct 25, 2014 | | -3 |
|
Simple FM transmitter using a single transistor | Transmitters | Mar 23, 2015 | | 1 |
|
Simple quiz display using 74 series logic chips | Games | Mar 23, 2015 | | 2 |
|
Single chip dice using a 4060 chip | Games | Dec 07, 2014 | | 1 |
|
Solid-state voltage indicator with high voltage cutout | Power | Dec 07, 2014 | | 0 |
|
Sound operated music bell using 555 timer | Alarms | Dec 07, 2014 | | -1 |
|
Stabilized Power Supply With Short-Circuit Indication | Power | Oct 25, 2014 | | -1 |
|
Stereo audio simulator | Audio | Mar 23, 2015 | | 0 |
|
Temperature Indicator Using AT89C52 | Microcontroller | Dec 07, 2014 | | -1 |
|
Touch operated Band switch for Radio Set | Misc | Oct 25, 2014 | | 0 |
|
Trangular wave generator | Timing | Mar 23, 2015 | | 0 |
|
Capacitor voltage stepper using 555 timer | Power | Dec 07, 2014 | | -2 |
|
White / LF noise generator | Audio | Dec 07, 2014 | | -1 |
|
Wind Sound Generator | Audio | Oct 25, 2014 | | -1 |
|
Home Built Laser Projector | Laser | | | -1 |
|
Arduino Mega 2560 schematic (PDF) - Arduino R3 | Arduino | Jul 21, 2013 | | -1 |
|
DPA 220 amplifier schematic | Amplifiers | | | -5 |
|
Low impedance microphone amplifier | Amplifiers | | | -4 |
|
DPA 440 amplifier schematic | Amplifiers | | | 0 |
|
Low pass filter for subwoofer | Filter | | | 3 |
|
Portable Mixer with high-quality modular design (9V battery powered) | Music | | | -1 |
|
100W audio amplifier including PCB layout | Amplifiers | Apr 14, 2011 | | -22 |
|
Quadraphonic Amplifier based on pair of LM1877 devices | Amplifiers | | | -3 |
|
DPA 880 amplifier schematic | Amplifiers | | | -4 |
|
Class-A/AB Amplifier delivering 100W into a 4 ohm load | Amplifiers | | | -7 |
|
Audio Indicator - monitor a loudspeaker, alarm, or audio source for presence of an audio waveform | Audio | | | -1 |
|
Stereo Audio Isolator | Audio | | | 0 |
|
Guitar Reverb Effect Version 2 | Music | | | -1 |
|
Guitar Reverb Pedal | Music | | | 0 |
|
Voltage Controlled Panner | Audio | | | 2 |
|
25 Watt MOSFET Audio Amplifier using IRF532 / IRF9532 hexfet transistors for output stage | Amplifiers | | | -3 |
|
Large capacitor charge "controllers" (Car Audio) | Automotive | | | 2 |
|
Easy to build DIY 50W amplifier based on ICL8063 | Amplifiers | | | 3 |
|
Audio VU Meter based on pair of LM324 quad opamps | Amplifiers | | | 1 |
|
Voice-Over Circuit | Audio | | | -2 |
|
20 Watt Audio Power Amplifier using TDA2005M | Amplifiers | | | -4 |
|
22 Watt Stereo Amplifier using TDA1554 | Amplifiers | | | -4 |
|
Two Transistors Audio Amplifier | Amplifiers | | | -2 |
|
10 Watt Audio Amplifier circuit diagram | Amplifiers | | | -4 |
|
Underwater microphone used in a home aquarium to monitor fish sounds | Audio | | | -2 |
|
DIY intervalometer for Sony NEX 5N camera | Photo | Jun 14, 2015 | | 2 |
|
DIY DC Amp Volt Watt Meter using an Arduino and ZXCT1010 | Arduino | Jun 14, 2015 | | 0 |
|
DIY Infrared Thermometer using Arduino Nano and MLX90614 | Arduino | Jun 14, 2015 | | -1 |
|
Speed limit alert | Automotive | Jul 05, 2012 | | -3 |
|
Motorcycle Alarm | Alarms | Jul 05, 2012 | | 2 |
|
Car Alarm and Immobilizer | Alarms | Jul 05, 2012 | | -1 |
|
Car Hijack Alarm | Alarms | Jul 05, 2012 | | -1 |
|
Motorcycle Alarm Number 2 | Alarms | Jul 05, 2012 | | 1 |
|
Motorcycle Alarm Number 3 | Alarms | Jul 05, 2012 | | -4 |
|
Motorcycle Alarm Number 4 | Alarms | Jul 05, 2012 | | -3 |
|
Motorcycle Alarm Number 5 & 6 | Alarms | Jul 05, 2012 | | 1 |
|
Park-Aid - Three LEDs signal bumper-barrier distance | Automotive | Jul 05, 2012 | | -2 |
|
Headlight Flasher | Automotive | Jul 05, 2012 | | 3 |
|
Car Voltage Gauge with 7-segment readout | Automotive | Jul 05, 2012 | | -1 |
|
Car Water Temperature Gauge with 7-segment readout | Automotive | Jul 05, 2012 | | 1 |
|
Auto Burglar Alarm | Alarms | Jul 05, 2012 | | 0 |
|
Automotive Speed Indicator | Automotive | Jul 05, 2012 | | 0 |
|
Simple but reliable car battery tester using LM3914 | Automotive | Jul 05, 2012 | | 1 |
|
Automotive 12V to +-20V converter (for audio amplifier) | Automotive | Jul 05, 2012 | | -1 |
|
Electronic car ignition | Automotive | Jul 05, 2012 | | 0 |
|
Car battery charger with automatic cutoff | Automotive | Jul 05, 2012 | | -4 |
|
Automatic Headlight Brightness Switch | Automotive | Jul 05, 2012 | | 3 |
|
Dome Lamp Dimmer | Automotive | Jul 05, 2012 | | 0 |
|
Light switch using LDR | Control | Jun 26, 2009 | | -3 |
|
Digital Remote Thermometer | Misc | Jun 26, 2009 | | 0 |
|
Fridge door Alarm | Alarms | Jun 26, 2009 | | -1 |
|
Room Noise Detector | Audio | Jun 26, 2009 | | -1 |
|
Capacitive Sensor | Misc | Jun 26, 2009 | | 1 |
|
Ultra-simple Voltage Probe | Test | Jun 26, 2009 | | 1 |
|
Emergency Light & Alarm | Alarms | Jun 26, 2009 | | 1 |
|
Heating System Thermostat | Control | Jun 26, 2009 | | -2 |
|
Touch switch based on CD4011 flip-flop | Control | Jun 26, 2009 | | -2 |
|
Door Alarm circuit diagram | Alarms | Jun 26, 2009 | | 0 |
|
Mains Remote-Alert - Remotely operates beeper and/or a LED via mains supply line | Misc | Jun 26, 2009 | | -2 |
|
Low Voltage Alarm for batteries and other volatile DC power sources | Power | Jun 26, 2009 | | -3 |
|
Touch activated switch using CD4011 CMOS NAND gate | Misc | Jun 26, 2009 | | 1 |
|
Voice activated switch (VOX) circuit diagram | Misc | Jun 26, 2009 | | 0 |
|
Everything-that-moves alarm works by inducing eddy currents in living beings | Alarms | Jun 26, 2009 | | -1 |
|
Electronic locker digital combination lock circuit diagram | Alarms | Jun 26, 2009 | | -2 |
|
Electronic Eavesdropping Devices Detector | RF | Jun 26, 2009 | | 1 |
|
Simple Infa-Red Remote Control | IR | Jun 26, 2009 | | 2 |
|
IR Remote Control Extender Circuit | IR | Jun 26, 2009 | | 2 |
|
Gate alarm | Alarms | Jun 26, 2009 | | -3 |
|
Circuit diagram for 5 Zone Alarm System | Alarms | Jun 26, 2009 | | -3 |
|
Miniature Loop Alarm | Alarms | Jun 26, 2009 | | 3 |
|
Modular Burglar Alarm | Alarms | Jun 26, 2009 | | -1 |
|
Water Activated Alarm | Alarms | Jun 26, 2009 | | -2 |
|
Novel buzzer using a relay and transformer | Audio | Jun 26, 2009 | | -3 |
|
Radio Wave Alarm | RF | Jun 26, 2009 | | 1 |
|
Enhanced 5 Digit Alarm Keypad | Alarms | Jun 26, 2009 | | -1 |
|
Enhanced 4 Digit Alarm Keypad | Alarms | Jun 26, 2009 | | -1 |
|
Automatic Intruder Alarm | Alarms | Jun 26, 2009 | | 0 |
|
Single Zone CMOS Alarm | Alarms | Jun 26, 2009 | | -2 |
|
Travel Touch Alarm | Alarms | Jun 26, 2009 | | 0 |
|
UltraSonic Radar | Misc | Jun 26, 2009 | | 0 |
|
Cuckoo sound Generator | Audio | | | 1 |
|
TRIAC Light Dimmer | Lighting | | | 2 |
|
LEDs or Lamps Sequencer is versatile modular design with no limits on number of lights | Lighting | | | -2 |
|
Battery-powered Night Lamp | Lighting | | | 0 |
|
Courtesy light circuit diagram | Lighting | | | 1 |
|
Brightness Control for small Lamps | Lighting | | | -2 |
|
12VDC Fluorescent Lamp Driver | Lighting | | | -1 |
|
LED Chaser using 4011 / 4017 CMOS chips | LED | | | -2 |
|
Adjustable Strobe Light | Lighting | | | 0 |
|
Fading LEDs | LED | | | 0 |
|
Dancing LEDs circuit diagram | LED | | | -1 |
|
Black Light powered by a 6 volt battery | Lighting | | | 1 |
|
DC Motor Control Circuit | Control | | | 2 |
|
Fan control based on a TL082 opamp and IRF510 power MOSFET | Control | | | -2 |
|
Bicycle back Safety Light | Lighting | | | 0 |
|
Simple LASER Transmitter/Receiver using HeNe laser tube | Laser | | | 4 |
|
LASER Transmitter/Receiver using Pulse Width Modulator (PWM) for 12V / 24V applications | Laser | | | 1 |
|
Nocturnal Animals Whisker | Misc | | | 1 |
|
Seven Component Regulated LED Lamp | LED | | | 3 |
|
LED Mood Light | LED | | | -3 |
|
13 Color LED Rainbow circuit diagram | LED | | | 5 |
|
Lightning Activated Camera Shutter Trigger | Photo | | | -1 |
|
Electronic Canary | Audio | | | 0 |
|
Metronome Circuit | Music | | | 1 |
|
Sun - Up Alarm that provides an audible alarm when the sun comes up or a dark area is illuminated | Alarms | | | -2 |
|
Assortment of Siren Circuits | Audio | Sep 17, 2009 | | -1 |
|
60 LED Clock | LED | | | -2 |
|
Bike Light Flasher | Lighting | | | 0 |
|
Simple 120 VAC motor speed controller based on a TRIAC | Control | | | -4 |
|
PIC Light Chaser using PIC16C84 | Microcontroller | | | -2 |
|
Wire tracer | Test | | | -3 |
|
Flashing neon christmas lights | Lighting | | | -1 |
|
Doorbell for the Deaf | Alarms | | | -4 |
|
Insect Repellant | Misc | Sep 17, 2009 | | -2 |
|
220 Volts Flashing Lamps | Lighting | | | -5 |
|
IR Audio link | IR | Jul 05, 2012 | | -3 |
|
Wireless IR headphone transmitter | IR | Jun 28, 2009 | | 0 |
|
Wireless IR headphone receiver | IR | Jun 28, 2009 | | 0 |
|
IR illuminator for night-vision tv cameras and scopes | IR | Jun 28, 2009 | | 0 |
|
Infra Red Switch that works with commonly available remote controls | IR | Jul 05, 2012 | | 0 |
|
Infra Red Remote Control Extender (Mark 1) | IR | Jul 05, 2012 | | 0 |
|
IR Remote Control Tester | Test | Jul 05, 2012 | | -1 |
|
IR Remote Control Extender Circuit (Mark 2) | IR | Jul 05, 2012 | | 0 |
|
IR Remote Control Extender Circuit (Mark 3) | IR | Jul 05, 2012 | | 0 |
|
IR Remote Control Extender Circuit (Mark 4) | IR | Jul 05, 2012 | | 0 |
|
IR Remote Control Extender Circuit (Mark 5) | IR | Jul 05, 2012 | | 1 |
|
Infrared Remote Control that operates on 115 volts AC | IR | Jul 05, 2012 | | 1 |
|
Three channel audio spectrum analyzer | Audio | Oct 21, 2009 | | 0 |
|
Digital Voltmeter using ICL7107 | Test | Sep 17, 2009 | | -3 |
|
Triangle / Squarewave Generator using a 1458 dual opamp | Timing | Oct 21, 2009 | | 1 |
|
Beeper to find short circuits | Test | Oct 19, 2009 | | -2 |
|
Voltage follower with 1G ohm input resistance based on LM11 opamp | Preamp | Oct 21, 2009 | | 0 |
|
Led display digital Voltmeter using ICL7107 | Test | Sep 17, 2009 | | 0 |
|
MOSFET transistor tester | Test | Nov 05, 2009 | | -6 |
|
Precision Audio Millivoltmeter | Audio | Sep 17, 2009 | | 0 |
|
Oscilloscope testing module (huntron circuit) | Test | Nov 10, 2009 | | 2 |
|
Voltage Monitor using UA741 operational amplifier | Power | Oct 19, 2009 | | -3 |
|
Logic probe | Test | Oct 19, 2009 | | 0 |
|
Digital Radar Speedometer | Misc | Oct 21, 2009 | | -2 |
|
Digital Volume Control based around CD4067 CMOS chips | Audio | Oct 19, 2009 | | -2 |
|
Electromagnetic Field Probe with Meter Output using an LF351 opamp | Misc | Oct 19, 2009 | | -2 |
|
Three-Level Audio Power Indicator | Audio | Oct 19, 2009 | | -1 |
|
Beat Balance Metal Detector | Metal | | | 65 |
|
Coil Coupled Operation Metal Detector | Metal | Nov 10, 2009 | | -4 |
|
Expanded Scale Battery Volt Meter | Power | Sep 17, 2009 | | 0 |
|
Pulse Reading Logic Probe | Test | Oct 19, 2009 | | 0 |
|
Stereo Test Tone Generator | Test | Oct 21, 2009 | | -2 |
|
Continuity Tester based on 4 x 2N3904 and 1 x 2N3905 transistors | Test | Oct 19, 2009 | | 0 |
|
Audible Logic Probe based on LM339 operational amplifier | Test | Oct 19, 2009 | | 0 |
|
Single chip digital voltmeter using ICL7129 | Test | Nov 05, 2009 | | -1 |
|
Latching Continuity Tester to help find intermittent faults, has quite a few innovative features | Test | Oct 19, 2009 | | 1 |
|
Infrared remote control tester using a SFH2030 photodiode and a CA3140 operational amplifier | IR | Oct 19, 2009 | | 1 |
|
Linear Resistance Meter | Test | Oct 19, 2009 | | -4 |
|
XTal Tester for testing quartz crystals based on a pair of BC550C PNP transistors | Test | Oct 19, 2009 | | -1 |
|
Simple RC car for beginners (Android control via Bluetooth) | Models | Jun 14, 2015 | | 0 |
|
Arduino RC car (Android control via Bluetooth) | Arduino | Jun 14, 2015 | | -2 |
|
STM32 RC car (Android control via Bluetooth) | Models | Jun 14, 2015 | | 2 |
|
Lighting control with Android device through Bluetooth | Lighting | Jun 14, 2015 | | 0 |
|
Android controlled RC Vehicle with real-time video (Bluetooth & Wi-Fi) | Models | Jun 14, 2015 | | -2 |
|
Portable GSM900 Cellular Phone Jammer | Telephone | Aug 01, 2010 | | 1 |
|
High Power 800 MHz/AMPS Cellular Phone Jammer | Telephone | Aug 01, 2010 | | 0 |
|
Cellular Phone Jammer. Ver 2 circuit diagram | Telephone | Aug 01, 2010 | | 0 |
|
Portable AMPS Cellular Phone Jammer | Telephone | Aug 01, 2010 | | 2 |
|
Portable AMPS Cellular Phone Jammer - Dual Purpose | Telephone | Aug 01, 2010 | | -1 |
|
PCS Phone Jammer circuit diagram | Telephone | Aug 01, 2010 | | 0 |
|
Portable PCS Cellular Phone Jammer circuit schematic | Telephone | Aug 01, 2010 | | 0 |
|
PCS Cellular Phone Jammer circuit schematic | Telephone | Aug 01, 2010 | | 2 |
|
GBPPR Cellular Phone Jammer Exciter schematic diagram | Telephone | Aug 01, 2010 | | 1 |
|
Cellular Phone Jammer RF Amplifier circuit diagram | Telephone | Aug 01, 2010 | | 0 |
|
Homebrew P2JBZ-style cellular / mobile phone jammer circuit | Telephone | Aug 01, 2010 | | 0 |
|
Self-powered Fast Battery-Tester - Tests 1.5 to 15 Volt cells | Test | Sep 17, 2009 | | 0 |
|
Battery Low Voltage Beeper | Power | Sep 17, 2009 | | -1 |
|
AA Battery Solar Charger | Solar | Sep 17, 2009 | | 1 |
|
4 Transistor Tracking Transmitter | Transmitters | | | 0 |
|
AM Transmitter | Transmitters | | | -5 |
|
FM Telephone Bug | Telephone | | | 0 |
|
FM Transmitter using two transistors | Transmitters | | | 1 |
|
AM/FM Simultaneous Transmitter Using Digital IC | Transmitters | | | 4 |
|
Medium range transmitter using pair of 2N3904 transistors | Transmitters | | | 2 |
|
15 watt FM transmitter circuit diagram | Transmitters | | | 1 |
|
AM Transmitter | Transmitters | | | -1 |
|
Single transistor FM transmitter | Transmitters | | | 2 |
|
Small FM transmitter using SMD components | Transmitters | | | 0 |
|
Miniature FM Transmitter | Transmitters | | | 0 |
|
Low Power FM Transmitter | Transmitters | | | 0 |
|
FM Voice Transmitter | Transmitters | | | 0 |
|
Sensitive FM Transmitter | Transmitters | | | 2 |
|
Small FM Transmitter | Transmitters | | | -1 |
|
TV Signal Amplifier covers frequencies from 40MHz to 900 MHz | Video | Jun 28, 2009 | | 1 |
|
Linear FM 50Watt with BLY90 | RF | Jun 28, 2009 | | -4 |
|
Motorized Video Camera Mount | Video | Jun 28, 2009 | | -1 |
|
TV Transmitter - VHF band TV transmitter using negative sound modulation and PAL video modulation | Video | Jun 28, 2009 | | -2 |
|
UHF Preamplifier covers 450MHz - 800MHz based on MPSH10 / BF180 / BCY90 | RF_Amplifier | Jun 28, 2009 | | -1 |
|
60W Linear amplifier using IRF840 power MOSFET | RF_Amplifier | Jun 28, 2009 | | -2 |
|
Video Signal Amplifier | Video | Jun 28, 2009 | | 1 |
|
Cellular Phone calling Detector | Telephone | Sep 17, 2009 | | -1 |
|
Simple Phone Tap circuit diagram | Telephone | Aug 12, 2009 | | -2 |
|
Telephone Hold Button circuit | Telephone | Aug 12, 2009 | | -1 |
|
Telephone recorder to record phone conversations automatically | Telephone | Aug 12, 2009 | | -1 |
|
Cellular Phone calling Detector | Telephone | Aug 12, 2009 | | 0 |
|
Phone line indicator | Telephone | Sep 17, 2009 | | 0 |
|
Isolated Telephone Interface | Telephone | Aug 12, 2009 | | 0 |
|
Telephone Record Control using 2N4360, 2N2222 and 2N2102 | Telephone | Aug 12, 2009 | | 0 |
|
Voice Scrambler | Audio | Aug 12, 2009 | | -1 |
|
Phone In Use Indicator circuit diagram | Telephone | Sep 17, 2009 | | 1 |
|
Phone "Hold" With Music | Telephone | Aug 12, 2009 | | -1 |
|
Voice / Audio Record / Playback Circuit | Audio | Aug 12, 2009 | | -2 |
|
Simple speakerphone | Telephone | Aug 12, 2009 | | 0 |
|
High Quality Intercom using LM380 amplifier IC | Telephone | Aug 12, 2009 | | 0 |
|
Soft Musical Telephone Ringer | Telephone | Aug 12, 2009 | | 0 |
|
Telephone amplifier | Telephone | Aug 12, 2009 | | -3 |
|
Cut Phone Line Detector | Telephone | Aug 12, 2009 | | 0 |
|
Telephone line monitor | Telephone | Aug 12, 2009 | | 0 |
|
Phone Busy Indicator | Telephone | Aug 12, 2009 | | -1 |
|
Ringing Phone Light Flasher using optocoupler and relay | Telephone | Aug 12, 2009 | | 0 |
|
ADC conversion using ADC0804LCN and 8051 | Microcontroller | | | -1 |
|
Build a Tape Linearizer and a Distortion Analyzer | Audio | Apr 14, 2010 | | -1 |
|
Peak-reading meters | Audio | Jan 26, 2001 | | -1 |
|
Microphone polarity tester circuit diagran | Test | Apr 14, 2010 | | -2 |
|
Audio Spectrum Analyzer and Equalizer Designs | Audio | Mar 30, 2010 | | -2 |
|
Build A Stereo Synthesizer | Music | May 07, 2010 | | 1 |
|
Electronic Control for DC Motors Using Discrete Bridge Circuits (PDF) | Control | | | 0 |
|
Defeating SCMS on DAY recorders using a Sony CXD2601 chip | Audio | May 07, 2010 | | -1 |
|
Bell 202 and CCITT V23 Compatible FSK Modem Circuit | PC | Oct 27, 2009 | | -1 |
|
Strobo Disco Light Using Standard Tube Lamp (TL) | Lighting | | | 5 |
|
Heartbeat Sensor (Tranduscer) | Medical | Jan 08, 2014 | | 1 |
|
Low Cost Universal Battery Charger | Power | Jan 08, 2014 | | -2 |
|
26V-to-5000V DC-DC Converter | Power | Jan 08, 2014 | | -2 |
|
Ring-Around LED Flasher | LED | Jan 08, 2014 | | 0 |
|
Black Light (UV Tube Lamp) Inverter | Lighting | Jan 08, 2014 | | 1 |
|
15 Channels Cascaded MAX455 Video Mux | Video | Jan 08, 2014 | | 1 |
|
Digital Encoder Circuit Using Stepper Motor | Control | Jan 08, 2014 | | 3 |
|
30-Khz Bandwidth High Linearity Opto-Isolated Amplifier | Amplifiers | Jan 08, 2014 | | -1 |
|
Three Wire RS232 To RS485 Converter | PC | Jan 08, 2014 | | -2 |
|
Low-Drift High-Impedance JFET DC Voltmeter | Test | Jan 08, 2014 | | -2 |
|
Telephone Circuit: Music On Hold | Telephone | Oct 03, 2013 | | 0 |
|
Loud 10-W Car Alarm Siren | Automotive | Oct 03, 2013 | | 1 |
|
Missing Pulse Detector Circuit with 555 IC | Misc | Oct 03, 2013 | | -1 |
|
Binaural Synthesizer/Mono to Stereo Converter for Small Speaker/Phones | Audio | Oct 03, 2013 | | -2 |
|
Fast Charger for Better Lead-Acid Battery Life | Power | Oct 03, 2013 | | 0 |
|
5 A Constant Voltage-Constant Current Regulator | Power | Oct 03, 2013 | | -1 |
|
Voltage Controlled Variable Gain Video Amplifier | Video | Oct 03, 2013 | | 0 |
|
Tremolo Effect Circuit for Electric Guitar or Other Musical Instruments | Music | Oct 03, 2013 | | 2 |
|
PC Audio Signal Generator Using RS232 Port | PC | Oct 03, 2013 | | -2 |
|
Powerline Carrier System Transmitter for Audio (Music/Speech) | Audio | Oct 03, 2013 | | 0 |
|
Compact 3W BTL Audio Power Amplifier TDA7056 | Amplifiers | Oct 03, 2013 | | -5 |
|
CamTrig - A home-made light-operated camera trigger | Photo | | | 0 |
|
A simple home-made light-operated camera trigger | Photo | | | 0 |
|
A home-made light-operated camera trigger using the stamp microprocessor | Photo | | | 0 |
|
Resistor decade box | Test | Aug 14, 2002 | | -2 |
|
Gameboy MIDI interface circuit schematic and notes on Linux development for Gameboy | PDA | Feb 05, 2010 | | 0 |
|
Octave screamer | Music | Jan 26, 2001 | | -3 |
|
Atari Punk Console schematics | Games | Oct 04, 2010 | | 1 |
|
Build A Roomba Bluetooth Adapter | Models | | | -2 |
|
Chaos generator | Misc | Jan 26, 2001 | | -2 |
|
Various CNC mill circuit diagrams and other DIY CNC mill information | Control | Jun 17, 2011 | | -1 |
|
5W Chinese PLL FM Transmitter With LCD Printed Circuit Board (PCB) | Transmitters | | | 1 |
|
Simple test equipment to build | Test | | | -2 |
|
A Two-Way Morse Practice Set | Misc | | | 0 |
|
Send Morse on your VHF Rig | RF | | | -1 |
|
An end-fed antenna, L-match coupler and resistive bridge for HF | RF | | | -3 |
|
Regenerative receiver for the AM broadcast band using two transistors | RF | | | 0 |
|
Two Valve 40m CW Transmitter | Tube | | | 1 |
|
Novel crystal set requires no antenna, earth | RF | | | 1 |
|
80 meter direct conversion receiver | RF | | | 0 |
|
3 - 12 MHz Signal Generator | Timing | | | 1 |
|
A compact L-match ATU for portable use | RF | | | 0 |
|
80m ceramic resonator VXO CW transmitter | Transmitters | | | 0 |
|
RF Power Meter for the QRP measures up to 25 watts | Test | | | 3 |
|
Converter to yune six metres on your two metre receiver | RF | | | 0 |
|
80 Metre DSB Transmitter | Transmitters | | | 0 |
|
High quality AM through your FM stereo | RF | | | -2 |
|
Signal Frequency Beat Frequency Oscillator | Timing | | | 0 |
|
Dip Oscillator for HF | Test | | | 1 |
|
Converter to Hear Amateurs on your FM Radio | RF | | | 0 |
|
RF Actuated Keying Monitor | RF | | | 0 |
|
LF to HF Converter | RF | | | -3 |
|
CMOS IC 1 kHz Audio Oscillator | Audio | | | 0 |
|
One Valve CW transmitter | Tube | | | 0 |
|
1A Variable Regulated Power Supply | Power | | | -1 |
|
Super 80 ultra-simple SSB receiver for 3.5 MHz a basic superhet | RF | | | -1 |
|
Two Tone Audio Oscillator | Audio | | | -2 |
|
Wide-swing Variable Crystal Oscillator | Timing | | | 0 |
|
Palm PDA based datalogger | PDA | | | 0 |
|
Traffic light controller with 20-output sequencing | Models | Sep 10, 2006 | | 0 |
|
4 Photo-Detector circuit with delayed release and bipolar output | Alarms | Aug 18, 2009 | | -1 |
|
5 Times Around Circuit | Models | Sep 10, 2006 | | 2 |
|
8 Photo-Detector Circuit Board | Data Acquisition | Sep 10, 2006 | | 0 |
|
Fast Electronic Circuit Breaker for Model Railways | Models | Nov 13, 2010 | | 0 |
|
Automatic - Railway Grade Crossing Circuit (2008 design) | Models | | | 0 |
|
Audible Train Approach Warning Circuit | Models | Sep 10, 2006 | | 1 |
|
Across The Track Infrared Detectors | Models | Sep 10, 2006 | | 0 |
|
Automatic Reversing Circuit for Model Trains | Models | Nov 13, 2010 | | -1 |
|
Voltage Comparator Information And Circuits | Misc | Apr 27, 2003 | | -1 |
|
Block Occupancy Detector For DCC | Models | | | 1 |
|
Rail Crossing Diamond Protection Circuit | Models | Sep 10, 2006 | | 1 |
|
Automatic Railway Grade Crossing Flashers | Models | Sep 10, 2006 | | 1 |
|
H Bridge Motor Control Circuits | Control | Jun 09, 2002 | | -3 |
|
Incline Railway Control Circuit | Models | Jan 01, 2003 | | -1 |
|
Infrared Proximity Detector based on Vishay TSOP4830 | IR | | | -1 |
|
LM3909 replacement using discrete components | LED | Feb 14, 2003 | | -1 |
|
Model Railroad Odometer Car | Models | Sep 10, 2006 | | 0 |
|
Visible and Infrared Light Detectors | Misc | | | 0 |
|
Turnout Anti-Derail Protection Circuits | Models | Sep 10, 2006 | | -1 |
|
Regulated Power Supply Circuits | Power | Sep 10, 2006 | | 0 |
|
Single Traffic Light Driver Circuit | Models | Nov 13, 2010 | | 0 |
|
Basic Solid State Relays | Power | Sep 10, 2006 | | -3 |
|
Unipolar and bipolar stepper motor driver circuits using 74194 and ULN2803 | Control | Nov 04, 2011 | | -1 |
|
Various Transistor Throttles Cicuit Schematics | Models | Sep 10, 2006 | | -1 |
|
Three Terminal Regulator Type Throttle (LM350K) | Models | Sep 10, 2006 | | 0 |
|
1200 Watt Lamp Dimmer Circuit using Q4015LT combination Diac | Lighting | Sep 10, 2006 | | -2 |
|
LM311 Thermostat circuit diagrams | Power | | | -1 |
|
10, 8 And 6 Step LED Circuits (CD4017) | LED | Sep 10, 2006 | | 0 |
|
5 Second Ramp Generator for Locomotive Sound Card Demonstration | Models | | | 1 |
|
Transformer Secondary Voltage Reduction | Power | | | 1 |
|
Adding External Meters to DC Throttles | Models | | | 1 |
|
Back And Forth - Bidirectional Bipolar Stepper Motor Driver | Power | | | 1 |
|
Grade Crossing Bell Ringer (LM555) | Models | | | 0 |
|
CA4060B Timer Circuits | Timing | Sep 10, 2006 | | -2 |
|
Train Mounted Camera Battery Charger | Models | | | 2 |
|
Using Common Cathode Or Anode LEDs As Bipolar LEDs | LED | | | 0 |
|
Timed Uncoupling Ramp Driver (LM555) | Models | Sep 10, 2006 | | 0 |
|
Colour Shifting For Bi-Colour LED's | LED | Sep 10, 2006 | | -3 |
|
Light Activated Detector Circuit (LM393/LM555) | Misc | Sep 10, 2006 | | 0 |
|
Diode Type Constant Lighting Circuits | Lighting | Sep 10, 2006 | | 0 |
|
High Side Current Monitors (LM358, Zetex - ZXCT-1009) | Power | Sep 10, 2006 | | 0 |
|
Current Regulators For Light Emitting Diodes | LED | Sep 10, 2006 | | -1 |
|
DCC To DC - Accessory Power Supplies | Models | | | 0 |
|
Grouped DCC Block Occupancy Detectors | Models | Sep 10, 2006 | | 1 |
|
HIGH or LOW Power Switch For Lights or Small Motors | Control | Sep 10, 2006 | | -1 |
|
High Impedance Voltmeter | Test | Sep 10, 2006 | | -1 |
|
Incandescent LED Circuit | LED | Sep 10, 2006 | | 0 |
|
Model Railroad - Infrared Proximity Switch | Models | | | 2 |
|
Infrared Receiver Module Schematics | IR | Sep 10, 2006 | | 1 |
|
Various LM555 LED Blinker Circuits | LED | Sep 10, 2006 | | 1 |
|
Low Battery Voltage Cutout Circuits | Power | Sep 10, 2006 | | -2 |
|
Preselect Twin Coil Switch Machine Circuit | Power | | | -3 |
|
First Across The Line Race Scorer Circuits | Models | Sep 10, 2006 | | -1 |
|
School Bus Signals Circuit | Models | Sep 10, 2006 | | -1 |
|
N.O. Magnetic Reed Switch ON /OFF Circuit (SCR equivalent) | Power | | | -2 |
|
Servo Motor Test Circuit (LM555) | Test | | | 0 |
|
Special Function Timer Circuits (LM555) | Timing | Sep 10, 2006 | | 2 |
|
Team digital - SCR16 - Twin Coil Switch Machine Adapter | Power | | | -1 |
|
LED Out Circuit For Tortoise Switch Machines | Models | | | 0 |
|
Push Button Motor Control Circuits | Control | Sep 10, 2006 | | 0 |
|
Timed DC Throttle | Models | Sep 10, 2006 | | 0 |
|
Efficient unipolar stepper motor driver (only uses power when it makes a step) | Power | | | 0 |
|
DCC - Zero Stretching Simulator (LM555) | Models | Sep 10, 2006 | | 0 |
|
10 GHz CW Radar based on a X-band Gunnplexer | Misc | | | -1 |
|
Self made data-logger V2.5 (second edition) | Data Acquisition | Nov 27, 2002 | | -3 |
|
GoldPic 3 Pulse Induction Metal Detector (has electronic kit available) | Metal | May 30, 2007 | | -8 |
|
Photodiode primer and interface circuit diagrams including photovoltaic and photoconductive modes | Misc | Mar 04, 2010 | | 0 |
|
Build a PIC controlled DDS VFO, 0 to 6 MHz | Microcontroller | Jul 12, 2001 | | -5 |
|
MBC5/CPLD for the GameBoy | Games | Oct 31, 2002 | | 1 |
|
10W 2M CW transmitter circuit diagram | Transmitters | Jun 19, 2011 | | -1 |
|
50 MHz to 10 MHz receive converter | RF | Jun 19, 2011 | | 1 |
|
17M to 6M transveter circuit diagram | RF | Jun 19, 2011 | | -1 |
|
metre receiver | RF | Jun 19, 2011 | | -2 |
|
Passive grid (tube based) linear amplifier | Tube | Jun 19, 2011 | | 0 |
|
T-Match ATU (antenna tuning unit) | RF | Jun 19, 2011 | | -2 |
|
Fourth order Butterworth BPF circuit diagram and design notes | Filter | Jun 19, 2011 | | -2 |
|
Frequency counter based on PIC16F628 and LCD display | Test | Jun 19, 2011 | | -4 |
|
10MHz GPS disciplined frequency standard | Timing | Jun 19, 2011 | | -1 |
|
Iambic keyer based on a PIC16F84 or PIC16C84 | Microcontroller | Jun 19, 2011 | | 0 |
|
Chebyshev low pass filter, rolls of at 30MHz | Filter | Jun 19, 2011 | | 0 |
|
PIC18F4550 Development Board including PCB layout suitable for home etching | Microcontroller | Jun 19, 2011 | | -1 |
|
Single transistor receiver for SSB, CW, AM using a VHF dual gate MOSFET | RF | Jun 19, 2011 | | 0 |
|
Multi band SSB transceiver construction project | RF | Jun 19, 2011 | | -1 |
|
Receiver building blocks | RF | Sep 06, 2001 | | 2 |
|
Digital display and VFO stabiliser using a PIC microcontroller and LCD | RF | Jun 19, 2011 | | 1 |
|
SSB transceiver for 80M | RF | Jun 19, 2011 | | -1 |
|
Simple CW transmitter for 80M | Transmitters | Jun 13, 2011 | | -1 |
|
VHF receiver converterer | RF | | | -1 |
|
A Receive Signal Decoder | Models | Oct 30, 2002 | | 1 |
|
Motor speed controllers | Control | Jun 17, 2003 | | -1 |
|
How to install LED lights to Mini-Z model car (based on PIC12C509) | Games | Nov 05, 2009 | | -1 |
|
Alternative power source for Magellan GPS receivers | Power | May 01, 2004 | | 0 |
|
PIC16F84 line following robot | Microcontroller | Jan 26, 2001 | | -2 |
|
8 x 8 Audio-video switch | Video | Mar 23, 2003 | | 0 |
|
Commodore 64 24-bit parallel port interface with 8255 | PC | Mar 23, 2003 | | 0 |
|
PIC16C505 IR / wireless remote control | Microcontroller | Mar 23, 2003 | | -2 |
|
DIY 2^16 encoder based on PIC | Microcontroller | Apr 12, 2014 | | -2 |
|
Electronic door codelock (PIC16F84) | Alarms | Mar 23, 2003 | | -1 |
|
Automatic door opener with PIC12C508 | Microcontroller | Mar 01, 2001 | | -2 |
|
Full-duplex doorphone with 3 wires connection | Misc | Mar 23, 2003 | | 0 |
|
Infrared gate for door | IR | Mar 23, 2003 | | 1 |
|
Infrared circuits for remote control | IR | Mar 23, 2003 | | 0 |
|
Serial port controller infrared transmitter (PIC16F628) | IR | Mar 23, 2003 | | 0 |
|
Dual light timer based on PIC - Automatically turn off the lights after 10 minutes | Lighting | Apr 12, 2014 | | -3 |
|
3-wire serial LCD interface for the PIC | Microcontroller | | | -1 |
|
Learning IR remote control receiver using a PIC16F628 | IR | Apr 12, 2014 | | -1 |
|
Low impedance microphone amplifier | Preamp | Mar 23, 2003 | | -6 |
|
RS485-like multi-drop bus with half duplex serial protocol | Microcontroller | Mar 23, 2003 | | -1 |
|
EPCOS Principles of SAWR-stabilized oscillators and transmitters application notes (PDF) | Transmitters | Apr 12, 2014 | | -2 |
|
Circuit diagrams for 418/433 MHz short-range communication (Elektor Electronics article) | RF | Apr 12, 2014 | | 3 |
|
88 - 108MHz FM audio transmitter / bug circuit diagram | Transmitters | Apr 12, 2014 | | -1 |
|
Circuit diagram for superregenerative receiver built by GE labs | RF | Apr 12, 2014 | | -3 |
|
X10 RF daughter board - receiver circuit diagram | RF | Apr 12, 2014 | | 0 |
|
RX3302 433MHz superregenerative receiver module circuit diagram | RF | Apr 12, 2014 | | -1 |
|
Automicro RX3304 receiver module schematic | RF | Apr 12, 2014 | | 1 |
|
Automicro TM02 high power data transmitter module circuit diagram | Transmitters | Apr 12, 2014 | | 1 |
|
27MHz toy car receiver L4=9 turns, .15mm wire on 4.5mm diameter tunable ferrite coil former | Models | Apr 12, 2014 | | -1 |
|
SAW-based 434MHz transmitter schematic with RO2101 1-port SAW resonator | Transmitters | Apr 12, 2014 | | -1 |
|
Simple VHF video transmitter / video modulator circuit diagram (not FCC approved) | Video | Apr 12, 2014 | | 0 |
|
500MHz video signal transmitter | Video | Apr 12, 2014 | | -1 |
|
RF Audio transmitter circuit diagram that operates in the AM broadcast band | Transmitters | Apr 12, 2014 | | -1 |
|
49MHz walkie-talkie circuit diagram that uses only three transistors | RF | Apr 12, 2014 | | 5 |
|
Superregenerative 27MHz receiver | RF | Mar 23, 2003 | | 0 |
|
LCD thermometer using PIC16F871 | Microcontroller | | | 0 |
|
Electronic irrigation controller based on PIC | Microcontroller | | | -1 |
|
USB digital I/O extender using a PIC18F14K50 | PC | Apr 12, 2014 | | -2 |
|
220V live wire-in-wall scanner | Test | Mar 23, 2003 | | -2 |
|
Opendiag OBD-II Schematics & PCB Layout
Opendiag OBD-II Schematics & PCB Layout | Automotive | | | -1 |
|
G Strain energy absorber | Misc | Jan 01, 2003 | | 1 |
|
'Almost No Parts' 7-segments 12/24 Hours LED clock with PIC 16F84A or 16F628A | Microcontroller | Sep 25, 2009 | | -4 |
|
FM Microphone micro-transmitter that is small and sensitive | Transmitters | | | -1 |
|
Montreal Doppler 3 DF (direction finder) unit | RF | Apr 14, 2011 | | 1 |
|
A PIC-based "TDOA" RDF (radio direction finder) antenna unit | Microcontroller | Apr 14, 2011 | | 1 |
|
Construction details for 30 meter rig with superhet receiver and crystal controlled transmitter | RF | Apr 12, 2014 | | 0 |
|
All Discrete Components 40 M transceiver with super-het receiver using no IC's | RF | Apr 12, 2014 | | -1 |
|
Versatile L tuner for end feed wire antennas that fits in an Altoids tin. | RF | Apr 12, 2014 | | 0 |
|
MMR-40 40 meter rig with SSB (voice) and CW (Morse code) operating modes. | RF | Apr 12, 2014 | | 1 |
|
Battery voltage monitor using an LM358 op-amp | Power | Apr 12, 2014 | | -1 |
|
KD1JV Digital SWR / Power Meter | Test | Apr 12, 2014 | | 0 |
|
An 80 meter rig for the MAS contest by KD1JV | RF | Apr 12, 2014 | | 1 |
|
A unique PSK transceiver, Version 2 By Steven Weber, KD1JV | RF | Apr 12, 2014 | | -2 |
|
(Fairly) Simple 75M SSB rig with PTT | RF | Apr 12, 2014 | | 2 |
|
AM Short Wave Broadcast Receiver circuit diagram | RF | | | -3 |
|
Low Power Antenna Analyzer and ATU Tuning Aid | Test | | | -1 |
|
Voltage boost and buck circuits using Atmel AVR Tiny13V for driving a white LED | LED | Mar 09, 2012 | | -2 |
|
Fixed Frequency "Tuner Dipper" | Test | | | -3 |
|
0-14 volt, 0-2 amp current limited variable power supply regulator | Power | | | -2 |
|
A Variable power supply with adjustable current limiting. 0-14V output up to 5A current. | Power | Apr 12, 2014 | | 0 |
|
Simple WWV receiver for 10 MHz calibration signal | Timing | Apr 12, 2014 | | -1 |
|
Microcontroller (AT89C2051) based tachometer (PDF) | Audio | Nov 13, 2010 | | -2 |
|
GSM SMS javljalnik ALSMS-01 (page in slovenian )SMS remote control project | Control | Oct 07, 2009 | | -1 |
|
Singing Christmas tree based on Microchip PIC16F84 | Microcontroller | Oct 07, 2009 | | -1 |
|
DDS/PLL based VFO synthesizer | Timing | Oct 07, 2009 | | 0 |
|
Universal USB digimode interface supports CAT (Yaesu), CI/V (Icom) and RS-232 (Kenwood) units (PDF) | RF | Oct 07, 2009 | | -1 |
|
50 MHz frequency counter, voltage meter & SWR/PWR indicator | Microcontroller | Jul 12, 2001 | | -1 |
|
Universal frequency counter & voltage meter | Test | Oct 07, 2009 | | 0 |
|
Convert 2m VHF FM PMR transceiver Motorola Radius M110 into an amateur radio | RF | Jun 18, 2003 | | 0 |
|
Simple CW identifier for a FM repeater (PDF) | RF | Oct 07, 2009 | | -1 |
|
Transceiver to PC soundblaster interface for digital operating modes (PSK-31, RTTY, SSTV etc) | PC | Oct 07, 2009 | | -1 |
|
6m SSB & CW QRP transceiver | RF | Oct 07, 2009 | | -1 |
|
80m SSB & CW QRP superhet transceiver | RF | Oct 07, 2009 | | 2 |
|
Transceiver to PC interface with a hardware DTMF detector and galvanic isolation (PDF) | PC | Oct 07, 2009 | | 0 |
|
Pocket sized 20m (30m) CW QRP transceiver | RF | Oct 07, 2009 | | 0 |
|
USB / CAT (CI-V) adapter tested with FT-8900, FTB-9800, VX-7R, VX-7, FT-817 and IC-706MkIIG | RF | Oct 07, 2009 | | 1 |
|
Amateur weather station to APRS interface ALWXI-01 | Misc | Oct 07, 2009 | | -1 |
|
Collection of quartz crystal ladder filter circuit diagrams | Filter | Oct 07, 2009 | | -1 |
|
Building a Digital Intervalometer - includes circuit diagram and suggested layout | Photo | May 09, 2010 | | 0 |
|
Serial LCD Controller using Microchip PIC16F628 | Microcontroller | | | -1 |
|
Arduino based motion triggered camera using a PIR sensor | Arduino | Nov 13, 2010 | | -3 |
|
Dynamo Current and Voltage Regulator | Power | Sep 21, 2006 | | -2 |
|
Wideband SWR meter | RF | | | 0 |
|
Spring reverb unit | Audio | Jan 26, 2001 | | -2 |
|
Incoming call indicator (ZIP file) | Telephone | Jan 26, 2001 | | 0 |
|
A 3m (100 MHz) small bug (ZIP file) | Transmitters | Jan 26, 2001 | | 0 |
|
Digital speedometer for cars with 7-segment display of speed | Automotive | Jun 28, 2011 | | -1 |
|
PC serial port parastic mode interface for 1-wire DS18S20 and similar 1-wire temperature sensors | PC | Jun 28, 2011 | | -1 |
|
Homebrew Wired Remote for Canon EOS 350D Camera | Photo | | | 1 |
|
Dreamcast PC serial adapter | Games | Oct 23, 2002 | | 0 |
|
How to use a SCART TV as a Monitor for MAME arcade game emulator | Games | | | 1 |
|
SCA Subcarrier Demodulator for FM broadcast stations | RF | | | 1 |
|
ESR Meter | Test | May 17, 2002 | | -2 |
|
Line Output / Flyback transformer tester | Test | May 17, 2002 | | 1 |
|
LED Voltage Indicator Board | LED | | | -3 |
|
Voice Message Recorder / Player (uses an obsolete voice recorder chip) | Audio | | | -1 |
|
BC547 80M SSB QRP Transceiver | Transmitters | | | 0 |
|
Timer circuit based on a 14536 and 4011 CMOS chips that can be calibrated using a frequency counter | Timing | Jan 31, 2010 | | 0 |
|
Circuit diagram for basic alarm with delayed trigger | Alarms | Feb 09, 2010 | | -1 |
|
General purpose portable DC power supply using rechargeable C cells | Power | Feb 05, 2010 | | -2 |
|
PCB board tester and RF detector circuir diagrams | Test | Feb 09, 2010 | | -1 |
|
Alarm circuit to remind you to turn off your DMM (digital multimeter) | Test | Jan 31, 2010 | | -1 |
|
Circuit to enable cycling a string of Christmas lights | Lighting | Jan 31, 2010 | | 0 |
|
Pseudo car alarm system | Automotive | Feb 05, 2010 | | -3 |
|
45 to 90Hz hum filter circuit diagram | Filter | Sep 13, 2006 | | 0 |
|
Sound alarm based on LM741 opamp and LM386 amplifier | Amplifiers | Feb 09, 2010 | | -2 |
|
General purchase audio preamplifier based on pair of 2N2222 transistors | Preamp | Jan 31, 2010 | | -8 |
|
Audible timer that can be used as a cooking timer for roasting peanuts for example | Timing | Jan 31, 2010 | | -1 |
|
Wireless alarm FM transmitter module | Alarms | Feb 09, 2010 | | 0 |
|
Switch debouncer circuits including transistor, CMOS logic and a 555 timer based design | Misc | Jan 31, 2010 | | 0 |
|
Percussion generator circuits | Music | Feb 09, 2010 | | 0 |
|
Bench power supply that allows a number of varying output voltages to be preset. Includes PCB layout | Power | Feb 26, 2010 | | -2 |
|
Small audio amplifier based on LM386 | Amplifiers | Jan 31, 2010 | | -4 |
|
Function generator based on 555 timer and three 2N2222 transistors | Test | Feb 05, 2010 | | -3 |
|
Interesesting circuits using diodes ideal for education or introductory courses on electronics | Misc | Feb 20, 2010 | | -1 |
|
Sequential flashing arrow circuit using a 4017, also includes a PCB layout | LED | Feb 26, 2010 | | 0 |
|
Selection of run circuits to experiment with the 4017 CMOS decade counter chip | Misc | Feb 26, 2010 | | -2 |
|
Notes on using LEDs and various LED driver circuit diagrams | LED | Feb 26, 2010 | | 2 |
|
Multi-trace scope display that allows up to 4 channels to be viewed on a single oscilloscope channel | Test | Feb 26, 2010 | | -1 |
|
Small circuit and PCB layout for recording to PC Sound Monitor / Pre-amp | PC | Feb 26, 2010 | | -1 |
|
FM Microphone transmitter / FM buf circuit diagram | Transmitters | Jan 31, 2010 | | 0 |
|
Model Train Diesel & Horn Sound Module | Models | Mar 30, 2010 | | 0 |
|
Magentic phono cartridge phono preamp circuit diagram | Preamp | Feb 05, 2010 | | -4 |
|
Power supply metering circuits for measuring both voltage and current | Power | Feb 09, 2010 | | -5 |
|
Cicuit diagram for super long range microphone for use with a shotgun microphone or parabolic dish | Audio | Feb 20, 2010 | | -2 |
|
Fuse or line monitor that will check the status of up to six fuses including a PCB layout | Alarms | Feb 20, 2010 | | -1 |
|
Variety of applications using a CMOS 4001 2-input NOR gate including a PCB layout | Misc | Feb 20, 2010 | | 0 |
|
Select of interesting electronic circuits that require only a single transistor ideal for education | Misc | Feb 20, 2010 | | 0 |
|
Small selection of useful circuits | Misc | Feb 09, 2010 | | -2 |
|
Variety of simple motor control circuit diagrams using SCR or TRIAC | Control | Feb 20, 2010 | | -1 |
|
Super mixer with microphone input / amplifier including a PCB layout | Amplifiers | Feb 20, 2010 | | -2 |
|
Selection of 14 oscillator circuits include sinewave, audio, logic and LED flashers | Timing | Feb 20, 2010 | | -1 |
|
Jeopardy game circuit diagram using three CMOS logic chips | Games | Feb 09, 2010 | | 1 |
|
Selection of audio preamplifiers including circuits suitable for battery operation | Preamp | Jan 31, 2010 | | -4 |
|
DDS from 1-60 MHz with built-in amplifier and variable output level using Analog Devices AD9851 | Test | | | -2 |
|
Ericsson phone to PC serial port interface | PC | Nov 29, 2002 | | -3 |
|
Network car controller provides functions for remote door locks, headlight reminder, and car finder | Automotive | May 16, 2010 | | -1 |
|
Emergency power system | Power | May 16, 2010 | | -3 |
|
Digital bench power supply based on a PIC16F870 | Power | May 24, 2010 | | -2 |
|
Candle simulator based on a PIC12F675 microcontroller | Lighting | May 16, 2010 | | 1 |
|
Magnetic card reader to PC RS-232 port interface based on a PIC12F675 micro | PC | May 24, 2010 | | 0 |
|
Cat toy using a PIC12F675 and a small weighted motor to keep your cat amused | Games | May 24, 2010 | | 0 |
|
Dirt cheap video using a PIC16F819 microcontroller | Microcontroller | May 16, 2010 | | -1 |
|
Dremel drill speed controller | Control | May 16, 2010 | | 0 |
|
Talking Egyption frog box | Games | May 24, 2010 | | 0 |
|
Talking fish hack using a PIC16F819 microcontroller | Microcontroller | May 16, 2010 | | -1 |
|
Furby Resurrection - Project that replaces the electronics in a Furby with new custom electronics | Games | May 24, 2010 | | 0 |
|
PWM Heater fan controller based on PIC12F675 | Control | May 24, 2010 | | -1 |
|
Hexbot robot based on a PIC including source code and circuit diagram | Models | May 16, 2010 | | -3 |
|
433MHz super remote control using a PIC12F683 to boost range | Transmitters | May 24, 2010 | | 0 |
|
Home theater system | Audio | May 24, 2010 | | -3 |
|
Beam robot / insect based on a PIC16F818 microcontroller | Models | May 24, 2010 | | 0 |
|
Infrared object detector using a PIC12F629 microcontroller | IR | May 16, 2010 | | -1 |
|
Isolated oscilloscope probe | Test | May 16, 2010 | | -1 |
|
Telephone line simulator ideal for testing phone interface projects | Telephone | May 24, 2010 | | 0 |
|
Lithium Ion Battery Charger based on a PIC micro including circuit diagram and source code | Power | May 24, 2010 | | 0 |
|
Marshmallow Bazooka with a PIC12F615 based capacitor discharge ignition system | Misc | May 16, 2010 | | 0 |
|
Colour Organ based on a PIC16F84 microcontroller including schematics and source code | Music | May 24, 2010 | | 3 |
|
Touch sensistive touchpad based on a PIC16F627A micro | Misc | May 24, 2010 | | -1 |
|
Self-powered phone messenger based on a PIC16C819 microcontroller | Telephone | May 24, 2010 | | 0 |
|
Phone call interceptor to stop unsolicited phone calls | Telephone | May 16, 2010 | | 0 |
|
Telephone call screener with voice | Telephone | May 24, 2010 | | 1 |
|
Remote RF transmitter based on PIC12F675 or PIC12F629 | Transmitters | May 24, 2010 | | -1 |
|
Remote infrared terminal for projects requiring IR communications | IR | May 24, 2010 | | 0 |
|
RS-232 to TTL level translator | PC | May 16, 2010 | | -1 |
|
DIY flying saucer / UFO using a PIC microcontroller | Games | May 16, 2010 | | 0 |
|
Solar charge controller based on a PIC microcontroller including schematic and source code | Solar | May 16, 2010 | | 0 |
|
SD card interface for PIC microcontroller including schematic and source code | Microcontroller | May 16, 2010 | | -2 |
|
Function Generator Sine / Triangle / Square / Saw / Burst Sweep Noise based on PIC16F870 | Timing | May 16, 2010 | | -1 |
|
Circuit monitoring device logs for over 10 days and can log up to 32k events both digital and analog | Data Acquisition | May 24, 2010 | | 0 |
|
Superprobe handheld test device based on a PIC16F870 | Test | May 24, 2010 | | 2 |
|
Speech Synthesizer Development System using a PIC microcontroller | Microcontroller | May 16, 2010 | | 1 |
|
Toy car hack to turn it into a synthetic rodent | Models | May 24, 2010 | | 0 |
|
PIC micro programmer that runs under MAC, Win98, XP, Vista, DOS, Linux, etc | Programmers | May 24, 2010 | | 1 |
|
Video switcher to allow monitoring of multiple video cameras using a single monitor | Video | May 24, 2010 | | 1 |
|
Low cost video motion detection using a PIC16F819 and an LM339 | Video | May 24, 2010 | | -1 |
|
YoYo enhancement device using a PIC12F629 to provide LED lighting effects | LED | May 24, 2010 | | -1 |
|
Electric cockroach zapper | Misc | May 24, 2010 | | -2 |
|
Programmer PIC16F84,12C50x and EEPROM 24Cxx | Programmers | Aug 14, 2002 | | 0 |
|
Build an inexpensive Hall effect Gaussmeter | Test | | | -1 |
|
Design for a slightly more expensive Gaussmeter | Test | | | -1 |
|
Home-Built Magnetic Levitator | Misc | | | 0 |
|
Project for experimenting with magnetic levitation | Misc | | | 1 |
|
Adaptive Windscreen Wiper Control | Automotive | Apr 14, 2003 | | -1 |
|
Portable iPod charger | PDA | | | 0 |
|
Ultrasound detector | Misc | Sep 13, 2006 | | -1 |
|
IC tone control preamplifier using single 741 opamp | Preamp | Jul 03, 2011 | | -5 |
|
1KHz 4th order Butterworth filter using LT1367 quad operational amplifier | Filter | Jul 03, 2011 | | 0 |
|
1.5 volt FM transmitter circuit diagram | Transmitters | Jul 03, 2011 | | -2 |
|
10-30 watt stereo audio amplifier circuit | Amplifiers | Jul 03, 2011 | | 8 |
|
118MHz to 136MHz aircraft receiver circuit diagram | RF | Jul 03, 2011 | | 3 |
|
12V 300W 4 channel car amplifier schematic diagram | Automotive | Jul 03, 2011 | | 3 |
|
1300MHz - 1500MHz transmitter with 20 - 50mW output power | Transmitters | Jul 03, 2011 | | 0 |
|
1300MHz - 1500MHz antenna with amplifier based on two MAR-8 RF amplifiers | RF_Amplifier | Jul 03, 2011 | | 1 |
|
15W mono car amplifier using TA7227P | Automotive | Jul 03, 2011 | | 2 |
|
Shortwave received circuit diagram | RF | Jul 03, 2011 | | -2 |
|
Two transistor audio preamplifier with volume control | Preamp | Jul 03, 2011 | | 0 |
|
20KHz Butterworth active filter using Linear Technology LT1124, LT1355 or LT1169 | Filter | May 25, 2012 | | 0 |
|
2W / 4W audio amplifier using pair of LA4100, LA4101 or LA4102 modules | Amplifiers | May 25, 2012 | | -6 |
|
455KHz oscillator using FET and 455KHz IF transformer | Timing | May 25, 2012 | | 1 |
|
6W mono car amplifier using BA521 or BA532 amplifier module | Automotive | May 25, 2012 | | 0 |
|
Basic logarithmic amplifier using op-amp and NPN transistor | Preamp | Jul 03, 2011 | | -5 |
|
Beat frequency oscillator for AM/SW radio receivers | RF | May 25, 2012 | | 0 |
|
Direct conversion 7MHz receiver using NE602 | RF | May 25, 2012 | | 0 |
|
Low voltage microphone preamplifier using LM10 | Preamp | May 25, 2012 | | 0 |
|
Micro TV transmistter | Video | May 25, 2012 | | -2 |
|
Mono audio preamplifier using single 2SC732 transistor | Preamp | May 25, 2012 | | -6 |
|
Relay interface to R/C receivers | Models | May 25, 2012 | | -1 |
|
Small TV transmitter for CCTV observation | Video | May 25, 2012 | | 1 |
|
VCR head amplifier tester | Test | May 25, 2012 | | -1 |
|
Video line receiver using AD818 | Video | May 25, 2012 | | -1 |
|
Wireless guitar transmitter | Music | May 25, 2012 | | -7 |
|
Wireless microphone using 741 opamp and 2N3904 | Transmitters | May 25, 2012 | | 0 |
|
WWV receiver | RF | May 25, 2012 | | 2 |
|
Casio calculator interface schematic | PDA | Sep 10, 2006 | | 1 |
|
Conrad Electronics MM3610D multimeter cable pinout | Test | Sep 10, 2006 | | -2 |
|
1.5 GHz PLL Frequency Synthesizer | RF | Apr 10, 2014 | | 0 |
|
Tiny EEG interface schematic | Medical | | | -1 |
|
OpenEEG open hardware EEG project | Medical | | | -2 |
|
Fitting a JTAG interface to an iPAQ 3600 | PDA | Sep 10, 2006 | | 0 |
|
Diode laser electronic circuits for atom optics | Laser | | | -2 |
|
Build Your Own Video-Rate 2-photon Microscope | Misc | Sep 25, 2009 | | 0 |
|
LED driving and controlling methods including constant current drivers and PWM brightness control | LED | Jul 11, 2012 | | -1 |
|
Touch senstor based on Atmel AT90S2313 | Microcontroller | | | 0 |
|
VHF/UHF TV modulator | Video | Nov 16, 2002 | | -1 |
|
Programming hardware and softrware for 14-bit FLASH PIC microcontrollers | Programmers | Feb 25, 2011 | | 0 |
|
Single cell LED flasher with two-year battery life (LM3909 replacement) | LED | | | -1 |
|
Volvo 164 electric fan thermostat | Automotive | Feb 25, 2011 | | -1 |
|
RS232 to RS485 converter schematic to connect PC to RS485 network | PC | Apr 09, 2010 | | -1 |
|
RS232 serial to USB converter cable circuit schematic | PC | | | -1 |
|
Sony RS-422 ADAT sync cable pinout | Misc | Sep 10, 2006 | | 0 |
|
Mac to HP48 cable pinout | PC | Sep 10, 2006 | | -1 |
|
Digital cameras (AGFA, Olympus) to PC (COM) cable pinout | Photo | Sep 10, 2006 | | 0 |
|
Garmin Foretrex 101,201, Forerunner 101,201 to Serial DB9 cable schematic pinout | Misc | Sep 10, 2006 | | 0 |
|
Apple iPod and iPhone dock pinout | PDA | Sep 13, 2006 | | -1 |
|
Palm Pilot, Palm III, V, VII, VIIx, Handera interface port pinout | PDA | Sep 13, 2006 | | 0 |
|
Car OBDII diagnostic interface cable schematic pinout | Automotive | Sep 10, 2006 | | -2 |
|
Car OBD II J1850 PWM, J1850 VPW, ISO-9141 cables schematic pinout | Automotive | Sep 10, 2006 | | 0 |
|
Simple DTMF Repeater Controller using PIC16F84 | Misc | | | -2 |
|
LCD clock based on AVR Attiny2313 | Microcontroller | | | -2 |
|
Music player built on microcontroller AT91SAM7S256 with ARM core | Music | | | -1 |
|
Build a Simple Bat Detector | Misc | Jan 08, 2014 | | 1 |
|
Various radio control schematics | Models | | | -3 |
|
Linear constant current source dimmer for a white 24-LED array | LED | Mar 03, 2011 | | 2 |
|
Simple current limiting for LED flashlights | LED | Mar 03, 2011 | | 0 |
|
Single-Wire-Telephones for caves and mines | Telephone | Mar 03, 2011 | | 0 |
|
Transverter for Converting SSB CB to LF for Thru-the-Earth Voice Communications | RF | Mar 03, 2011 | | 2 |
|
A simple and inexpensive laser power meter (PDF) | Laser | Feb 21, 2013 | | -1 |
|
101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU | Microcontroller | Jan 26, 2001 | | -1 |
|
Traffic light controller using an Arduino microcontroller | Arduino | Aug 26, 2010 | | -2 |
|
Simple ADS-B aircraft transponder decoder based on a PIC18F2550 microcontroller | RF | Dec 09, 2010 | | 2 |
|
PIXpand - TI calculator to Playstation memory card interface | Microcontroller | Jul 12, 2001 | | 0 |
|
Constant current LED driver schematic using a pair of BC547 transistors | LED | Jul 11, 2012 | | -1 |
|
Simple laser communicator | Laser | Jun 09, 2002 | | -1 |
|
Arduino UNO based CW decoder | Arduino | Jun 24, 2015 | | -1 |
|
PIC 18 programmer (PIC18F458, PIC18F452, PIC18C252, PIC16C745, PIC18F6620, PIC18F6720) | Programmers | Jun 06, 2003 | | 0 |
|
Game boy camera PC serial interface | PC | Sep 13, 2006 | | -1 |
|
Build a synchronous clock locked to the mains frequency | Timing | Aug 18, 2009 | | 0 |
|
Simple Class A Amplifier - 10W audio output | Amplifiers | Jan 22, 2010 | | -3 |
|
Better Volume (and Balance) control circuit diagrams | Audio | Apr 14, 2010 | | -1 |
|
Low Noise Microphone Preamplifier | Preamp | Jun 04, 2010 | | -3 |
|
Bridging Adapter For Audio Power Amplifiers | Amplifiers | Jan 29, 2010 | | -7 |
|
Audio Millivoltmeter | Test | Apr 14, 2010 | | 0 |
|
'A' Weighting Filter For Audio Measurements | Filter | Sep 13, 2006 | | 0 |
|
Simple surround sound decoder circuit schematic | Audio | Apr 14, 2010 | | -1 |
|
Stereo Width Controllers | Music | May 07, 2010 | | -1 |
|
Power Amplifier Clipping Indicator Circuit Diagram | Amplifiers | Jan 29, 2010 | | -3 |
|
Collection of phono preamplifier circuits | Preamp | Apr 21, 2010 | | 6 |
|
Digital Delay Unit For Surround Sound | Music | May 07, 2010 | | -2 |
|
100W Guitar Amplifier Mk II circuit diagram | Music | Jan 29, 2010 | | -5 |
|
Parametric And Sub-Woofer Equaliser | Audio | Apr 14, 2010 | | -2 |
|
High Quality Audio Mixer | Audio | Mar 17, 2010 | | -3 |
|
Simple Car Preamplifier and Artificial Earth | Preamp | Jan 29, 2010 | | -2 |
|
Loudspeaker Protection and Muting | Audio | Jan 29, 2010 | | -2 |
|
Spring Reverb Unit For Guitar or Keyboards | Music | Apr 14, 2010 | | 0 |
|
Audio Signal Detecting Auto Power-On Unit | Control | Mar 30, 2010 | | 1 |
|
Soft-Start Circuit For Power Amps | Amplifiers | Mar 30, 2010 | | -1 |
|
Mains Power Load Sensing Automatic Switch | Control | Mar 30, 2010 | | -1 |
|
Thermo-Fan to keep your amplifier or other equipment cool | Control | Mar 30, 2010 | | -1 |
|
Guitar Vibrato Unit Circuit Diagram | Music | Apr 14, 2010 | | 1 |
|
Microphone Circuit Test Oscillator | Test | Apr 14, 2010 | | 0 |
|
Distortion analyser circuit diagram | Test | Apr 14, 2010 | | -2 |
|
VU And PPM Audio Metering | Audio | May 07, 2010 | | -2 |
|
Variable Amplifier Impedance | Amplifiers | Mar 30, 2010 | | -1 |
|
The ESP SIM (Sound Impairment Monitor) | Test | Apr 14, 2010 | | -2 |
|
Linkwitz Cosine Burst Generator | Test | Apr 14, 2010 | | 0 |
|
Multiple Feedback Bandpass Filter | Filter | Nov 01, 2002 | | 0 |
|
High quality audio preamplifier (OPA2134) | Preamp | Sep 13, 2006 | | -8 |
|
Automatic Charger for Battery Operated Hi-Fi Preamps | Preamp | Jun 17, 2003 | | 0 |
|
Capacitance to Voltage conversion | Misc | | | 0 |
|
LED dice project based on 555 timer and CD4017 decade counter | Games | | | 0 |
|
CMoy pocket headphone amplifier | Amplifiers | | | -4 |
|
Biasing Op-Amps into Class A | Misc | Jan 01, 2003 | | 0 |
|
Laser high-voltage power supply | Laser | Oct 06, 2006 | | 0 |
|
THE FOX - 40 milliwatt transmitter | Transmitters | Apr 14, 2011 | | 0 |
|
THE FOX 750 - 750 milliwatt transmitter | Transmitters | Apr 14, 2011 | | 0 |
|
Active RF antennuator | RF | Apr 14, 2011 | | 2 |
|
FOX BOX - Transmitter controller | Transmitters | Apr 14, 2011 | | 0 |
|
Amplified field strength meter / RF sniffer | Test | Apr 14, 2011 | | -2 |
|
THE FOX - 250mw transmitter with timer | Transmitters | Apr 14, 2011 | | 2 |
|
Simple Time-Difference-Of-Arrival RDF | RF | Apr 14, 2011 | | 0 |
|
555 Time-Difference-Of-Arrival RDF | RF | Apr 14, 2011 | | -1 |
|
PIC-Bot II using Microchip PIC16LF84 | Models | | | 0 |
|
Arduino MIDI interface (Arduino MIDI Drum Kit and Spooky Sound Trigger) | Arduino | Aug 26, 2010 | | -1 |
|
Solar robots | Solar | Nov 16, 2002 | | -1 |
|
Bleeper box for time reference | Misc | May 01, 2004 | | -1 |
|
3 in one tester (audio, tone generator, diode/circuit tester) | Test | | | -3 |
|
50MHz converter project based on a NE602/SA602/NE612 | RF | | | 0 |
|
AF variable frequency generator using 555 IC | Timing | | | 0 |
|
Regulatable audio amplifier using a 741opamp | Amplifiers | | | 1 |
|
HF/6M Antenna Tuner Preselector and Antenna Switcher | RF | | | 0 |
|
Bass EQ pre-amp correction for high impedance ceramic crystal pickup | Amplifiers | | | -3 |
|
300/1200 baud BAYCOM MODEM (revision and improved) | PC | | | -1 |
|
Direct Crystal radio receiver examples | RF_Amplifier | | | 2 |
|
Crystal switcher using diodes | Timing | | | 1 |
|
MW Enhanced Crystal Receiver using 741 IC | RF | | | -2 |
|
455 Khz MF to AF converter used for DRM reception in a Yaesu FRG-100 receiver | RF | | | 1 |
|
Emergency light flasher schematic | Lighting | | | -1 |
|
Sensitive LW/MW/SW Shortwave general coverage receiver | RF | | | -1 |
|
HAMCOM (SSTV, RTTY, FAX...) modem using PC-speaker for TX | PC | | | -1 |
|
10 meter (28MHz) band RF amplifier | RF_Amplifier | | | 1 |
|
12 watt audio amplifier with tone using TDA1020 | Amplifiers | | | 0 |
|
5 watt audio amplifier using TDA1010 | Amplifiers | | | -3 |
|
Low frequency / audio frequency dB output meter | Audio | | | -1 |
|
Basic low frequency preamplifier circuits | Preamp | | | 2 |
|
Microphone pre-amp with high emphasis | Preamp | | | -4 |
|
MW/SW Radio receiver | RF | | | 0 |
|
Bipolar transistor RF mixer | RF | | | -1 |
|
IC oscillator 1...30MHz using 74LS04 chip | Timing | | | 2 |
|
Simple AF-oscillator / signal generator using pair on 2N2222 transistors | Timing | | | 1 |
|
HF/VHF mini portable antenna tuner | RF | | | 0 |
|
Microphone preamp for portable transceivers | Preamp | | | -1 |
|
Wideband VHF/UHF/SHF 22dB RF preamp with MAR-6 or MAR-8 (MSA-0885) | RF_Amplifier | | | -3 |
|
PTT and/or soundcard interface | PC | | | 0 |
|
PTT and soundcard interface for the TM255/455 | PC | | | 0 |
|
HF 10 watt amplifier for 18MHz using a 2SC1969/2SC1944 transistor | RF_Amplifier | | | 0 |
|
RF Power meter / dummy load | RF | | | 1 |
|
HAMCOM (SSTV, RTTY, FAX...) modem using serial audio for TX | PC | | | 0 |
|
HAMCOM & SoundCard MODEM using serial- or soundcard audio | PC | | | -1 |
|
SWR bridge covering HF to VHF | RF | | | 1 |
|
Active bandpass filter with TDA2320A | Filter | | | 1 |
|
1 Watt audio amp using a TDA7052 | Amplifiers | | | -1 |
|
TM-441 9600bps packet modification | PC | | | -1 |
|
1 Watt AM transmitter for the 10 meter band (28MHz) | Transmitters | | | 1 |
|
12-meterband QRP AM oscillator transmitter using a 2N2219 transistor | Transmitters | | | -1 |
|
500mW AM transmitter for the 20 meter band (14MHz) | Transmitters | | | -1 |
|
VHF 6 Meterband RF amplifier | RF_Amplifier | | | -1 |
|
HF/VHF portable antenna tuner | RF | | | -1 |
|
90S2313 AVR Robot Board | Microcontroller | May 01, 2004 | | 1 |
|
A selection of robotics projects | Models | Jun 09, 2002 | | 0 |
|
Digital clock based on 74 series logic | Timing | | | 0 |
|
LH0032 video amplifier | Video | Oct 24, 2002 | | -1 |
|
LM359N video amplifier | Video | Oct 24, 2002 | | -1 |
|
ATmega8 based TNC with GPS and WX support | Microcontroller | Mar 27, 2009 | | -2 |
|
Atmel AVR 90s2313 based POCSAG encoder (ZIP file) | Microcontroller | Mar 27, 2009 | | 1 |
|
Atmel 90s2313 based TNC | Microcontroller | Mar 27, 2009 | | 0 |
|
ATmega48 based Nixie Clock | Tube | Mar 27, 2009 | | 0 |
|
POCSAG encoder/decoder (Zip file) | Microcontroller | Jul 10, 2002 | | -1 |
|
Simple alarm with telephone dialler interface | Telephone | Mar 27, 2009 | | 1 |
|
In-circuit electrolytic capacitor checker | Test | Mar 27, 2009 | | -2 |
|
Logic probe with pulser | Test | Mar 27, 2009 | | -2 |
|
Telephone line simulator | Telephone | Mar 05, 2001 | | 2 |
|
Making your own RS-60E3 Remote Control for Canon EOS cameras | Photo | | | -1 |
|
Home made PBX / PABX | Telephone | Jun 17, 2003 | | 1 |
|
Headphone amplifier based on 12AX7 tubes | Tube | | | -1 |
|
Two nixie display clock | Tube | | | 1 |
|
Pocket Ignignokt LED display | LED | | | 1 |
|
VFD (vacuum flourescent display) clock | Tube | | | 0 |
|
Single-digit Nixie clock | Tube | | | 0 |
|
Oscilloscope CRT Clock | Tube | | | 0 |
|
Weston Voltmeter Clock | Timing | | | 0 |
|
Using a PC power supply as a benchtop power supply | PC | | | -1 |
|
Digibox interface circuit diagram | IR | Aug 09, 2002 | | 0 |
|
Six-channel Mixer and Amplifier | Amplifiers | Jan 31, 2003 | | -1 |
|
Audio Signal Source | Audio | Oct 30, 2002 | | -1 |
|
Random noise generator | Misc | Jan 26, 2001 | | 0 |
|
Analog pulse counter | Misc | Aug 12, 2001 | | 0 |
|
Analog opto-isolator | Misc | Aug 12, 2001 | | 0 |
|
Voltage controlled amplifier | Amplifiers | Aug 12, 2001 | | 0 |
|
Current loop interface | Control | Aug 12, 2001 | | -1 |
|
Audio graphic equaliser | Audio | Aug 12, 2001 | | -2 |
|
Intercom preamp | Preamp | Aug 12, 2001 | | 0 |
|
Electric field & leakage detector | Test | Aug 12, 2001 | | -2 |
|
Pulse width modulators (PWM) | Misc | Aug 12, 2001 | | 0 |
|
30W ultra-low distortion audio power amplifier | Amplifiers | Jan 22, 2010 | | -4 |
|
Pulse width to voltage converter | Misc | Aug 12, 2001 | | -1 |
|
Ultrasonic remote control & alarm system | Alarms | Aug 12, 2001 | | -2 |
|
Grand Cherokee Off-Highway Lights | Automotive | | | -1 |
|
Flashing LED circuit using 555 timer | LED | Jul 03, 2011 | | 0 |
|
Engine control unit schematics | Automotive | Nov 16, 2002 | | 0 |
|
3 Channel Spectrum Analyzer | Audio | Sep 01, 2009 | | -1 |
|
3 Watt FM Transmitter circuit diagram | Transmitters | Sep 01, 2009 | | 1 |
|
6V to 12V Converter | Power | | | -2 |
|
AC Motor Speed Controller | Control | Sep 01, 2009 | | -1 |
|
Aircraft Radio Communications Receiver | RF | Sep 01, 2009 | | -1 |
|
Air flow detector using an incandescent lamp to detect airflow | Misc | | | 0 |
|
Wire Loop Alarm using 4001UBE Quad NOR Gate | Alarms | Sep 01, 2009 | | -1 |
|
Circuit diagram for 8 watt audio amp | Amplifiers | Jan 26, 2001 | | 1 |
|
22 Watt Audio Amplifier using TDA1554 two channel audio amp chip | Amplifiers | Sep 01, 2009 | | 8 |
|
50 Watt Amplifier circuit diagram | Amplifiers | Sep 01, 2009 | | -4 |
|
Fantastic Atom Expander | LED | Sep 01, 2009 | | 1 |
|
Car Alarm Arming Horn Beep Canceller | Automotive | Sep 01, 2009 | | 0 |
|
Black Light | Lighting | Sep 01, 2009 | | 1 |
|
Portable CD Player Adapter For Car | Automotive | Sep 01, 2009 | | -2 |
|
Car Battery Charger | Automotive | Sep 01, 2009 | | -3 |
|
Automatic 12V Lead Acid Battery Charger | Power | Sep 01, 2009 | | 0 |
|
LED Chaser | LED | Sep 01, 2009 | | 0 |
|
Simple Two Speed Contactor DC Motor Controller | Control | Sep 01, 2009 | | 0 |
|
Digital Keypad Combination Lock | Alarms | Sep 01, 2009 | | -2 |
|
Computer Controlled Frequency Counter/Logic Probe | PC | Sep 01, 2009 | | -1 |
|
Simple Colour Organ | Music | Sep 01, 2009 | | 1 |
|
7 Segment LED Counter | LED | Sep 01, 2009 | | 1 |
|
Crystal Radio | RF | Sep 01, 2009 | | 1 |
|
Circuits to computerize your room/house | PC | Sep 01, 2009 | | -2 |
|
TRIAC Light Dimmer | Lighting | Sep 01, 2009 | | 0 |
|
12VDC Fluorescent Lamp Driver | Lighting | Sep 01, 2009 | | 1 |
|
FM Transmitter with range of about 300 feet | Transmitters | Sep 01, 2009 | | 0 |
|
Guitar Fuzz Effect | Music | Sep 01, 2009 | | 0 |
|
Automatic Headlight Brightness Switch | Automotive | Sep 01, 2009 | | -2 |
|
Solid State Tesla Coil/High Voltage Generator | Power | Sep 01, 2009 | | -1 |
|
Simple Parallel (Printer) Port Interface | PC | Sep 01, 2009 | | -1 |
|
12V to 120V Inverter circuit diagram | Power | Sep 01, 2009 | | -4 |
|
Infa-Red Remote Control | IR | Sep 01, 2009 | | 0 |
|
IR Remote Control Jammer | IR | Sep 01, 2009 | | 0 |
|
LASER Power Supply | Laser | Sep 01, 2009 | | 3 |
|
LASER Transmitter/Receiver | Laser | Sep 01, 2009 | | 0 |
|
LED Thermometer | LED | Sep 01, 2009 | | 1 |
|
Simple Lie Detector | Misc | Sep 01, 2009 | | 0 |
|
Light/Dark Detector drives a relay | Control | Sep 01, 2009 | | -1 |
|
Low Voltage Alarm | Misc | Sep 01, 2009 | | 0 |
|
Video Stabilizer/MacroVision Removal | Video | Sep 01, 2009 | | -3 |
|
FET Audio Mixer | Audio | Sep 01, 2009 | | -1 |
|
Microphone Mixer | Audio | Sep 01, 2009 | | -2 |
|
Pulse Width Modulation DC Motor Controller | Control | Sep 01, 2009 | | -1 |
|
8 Note Tune Player | Music | Sep 01, 2009 | | 0 |
|
Colour (Sound) Organ | Music | Sep 01, 2009 | | 0 |
|
Ringing Phone Light Flasher | Telephone | Sep 01, 2009 | | 0 |
|
Phone Busy Indicator | Telephone | Sep 01, 2009 | | 0 |
|
FM Telephone Bug | Telephone | Sep 01, 2009 | | 0 |
|
Cut Phone Line Detector | Telephone | Sep 01, 2009 | | 0 |
|
Simple Phone Tap Circuit | Telephone | Sep 01, 2009 | | 0 |
|
Telephone Hold Button | Telephone | Sep 01, 2009 | | 0 |
|
Telephone Recorder | Telephone | Sep 01, 2009 | | 0 |
|
Simple Polarity Tester | Test | Sep 01, 2009 | | -1 |
|
Water Detector With Sump/Bilge Pump Controller | Control | Sep 01, 2009 | | -1 |
|
Pine Racecar Victory Judge | Games | Sep 01, 2009 | | 0 |
|
Op Amp Radio | RF_Amplifier | Sep 01, 2009 | | -1 |
|
Rain Detector | Misc | Sep 01, 2009 | | 0 |
|
Time Delay Relay | Control | Sep 01, 2009 | | -1 |
|
Time Delay Relay II | Control | Sep 01, 2009 | | 1 |
|
Remote Telephone Bell Ringer | Telephone | Sep 01, 2009 | | 0 |
|
Simple Servo Controller using 555 Timer | Control | Sep 01, 2009 | | -3 |
|
Flash Slave Trigger | Photo | Sep 01, 2009 | | 0 |
|
Stepper Motor Controller using 4027 flip-flop and 4070 XOR gate | Control | Sep 01, 2009 | | -1 |
|
Mono To Stereo Synthesizer / Simulator | Audio | Sep 01, 2009 | | 0 |
|
Electronic Stethoscope | Medical | Sep 01, 2009 | | 2 |
|
Strobe light | Lighting | Jan 26, 2001 | | 0 |
|
Adjustable Strobe Light | Lighting | Sep 01, 2009 | | -1 |
|
Basic Power Supply | Power | Sep 01, 2009 | | 2 |
|
High Current Power Supply | Power | Sep 01, 2009 | | -1 |
|
Dual Polarity Power Supply | Power | Sep 01, 2009 | | -1 |
|
High Voltage High Current Power Supply | Power | Sep 01, 2009 | | -3 |
|
Transformerless Power Supply | Power | Sep 01, 2009 | | -5 |
|
Fixed Voltage Power Supply | Power | Sep 01, 2009 | | -1 |
|
Wireless Auto Tachometer | Automotive | Sep 01, 2009 | | 0 |
|
Tone Control using TDA1524A Tone Control IC | Audio | Sep 01, 2009 | | -1 |
|
Simple Transistor Organ | Music | Sep 01, 2009 | | 0 |
|
Touch Switch using 4011 CMOS NAND Gate IC | Control | Sep 01, 2009 | | -2 |
|
Video Activated Relay | Video | | | 0 |
|
Voltage Inverter using 555 Timer | Power | Sep 01, 2009 | | -2 |
|
Voltage Inverter using LM380 audio amplifier IC | Power | Sep 01, 2009 | | -3 |
|
Digital Volume Control using DS1669 Digital Pot IC | Audio | Sep 01, 2009 | | -1 |
|
Sound Level Meter | Audio | Sep 01, 2009 | | -1 |
|
89C2051 microcontroller programmer | Programmers | | | 0 |
|
JFET Bass Preamp | Preamp | | | -1 |
|
Dual power supply | Power | Jan 31, 2003 | | -1 |
|
Magnetic levitation device | Misc | Aug 14, 2002 | | 0 |
|
Tesla power receiver | Misc | Jan 06, 2002 | | 0 |
|
Class B series modulator | RF | | | -1 |
|
The KD2BD Pacsat Modem | PC | Jul 10, 2002 | | -1 |
|
SHARP palm-top/hand-held to RS232 serial converter | PDA | | | 0 |
|
1.9 Kilojoule Coil Gun | Misc | Nov 16, 2010 | | -1 |
|
20kV Digital High Voltage Meter | Test | Nov 16, 2010 | | 1 |
|
Build your own radio controlled switch from a cordless telephone | Telephone | Nov 16, 2010 | | 0 |
|
A spark throwing tesla coil made entirely of garbage | Misc | Nov 16, 2010 | | 1 |
|
Measuring Acceleration Using a PIC Microcontroller (ADXL202 + PIC16F84A) | Microcontroller | Jan 09, 2010 | | -1 |
|
PIC serial communications tutorial, includes circuit diagram and PIC16F84 assembler code | Microcontroller | Jan 09, 2010 | | -1 |
|
Eight simple power supplies for your workbench (mainly vacuum tube based) | Tube | Apr 10, 2014 | | 0 |
|
Build a Crystal Set (simple AM radio receiver) | RF | Apr 10, 2014 | | 2 |
|
Filter Choke Analyzer | Test | Apr 10, 2014 | | -1 |
|
Vacuum Tube Grid Leak Detector: Needs an Amplifier | Tube | Apr 10, 2014 | | 0 |
|
A Load Box for testing power supplies | Test | Apr 10, 2014 | | -2 |
|
Low resistance adapter for a DMM (digital multimeter) | Test | Apr 10, 2014 | | 0 |
|
Vacuum Tube Plate Detector: Needs an Amplifier | Tube | Apr 10, 2014 | | 1 |
|
Precision Frequency Control for AM Radios - A Frequency Synthesized Local Oscillator | RF | Apr 10, 2014 | | 0 |
|
Miniature SWR / RF power meter circuit | Test | Feb 15, 2014 | | -2 |
|
Home Brew Compass Sensor | Data Acquisition | Apr 27, 2003 | | -1 |
|
Higher Order Analog Butterworth Filter Designs, includes on-line filter calculator | Filter | Jan 16, 2010 | | -1 |
|
SWTP PR-40 Printer Interface Schematics | PC | Sep 10, 2006 | | -2 |
|
Interfacing Sony control stick to Empeg | Games | Jun 09, 2002 | | 0 |
|
Negative voltage generator | Power | Aug 12, 2001 | | 1 |
|
Basic Homebuilt Discrete DTL gate circuits (Diode Transistor Logic) | Misc | | | 0 |
|
Electronic shutter release with ultrasonic remote control | Photo | | | 0 |
|
Lazer Tag Equipment Modifications | Misc | Mar 23, 2003 | | 0 |
|
A Serial Infrared Remote Controller | PC | Jan 26, 2001 | | 0 |
|
Driving high-power loads with a microprocessor | Microcontroller | | | -1 |
|
Control your camera (Canon DSLR) with your Palm PDA | Photo | | | 0 |
|
Simple 10 bit DAC for the Arduino using TLC274 opamp | Arduino | Jun 07, 2011 | | -1 |
|
Connect a NTC with a wheatstone bridge to a normal AD-Input | Data Acquisition | | | 1 |
|
IDE interface to a Microchip PIC16F877 microcontroller | Microcontroller | | | 0 |
|
Inexpensive APRS Weather Station | Misc | Aug 14, 2002 | | 0 |
|
1381 solar engine | Solar | Nov 16, 2002 | | 0 |
|
Collection of BEAM robot circuits | Models | Sep 01, 2009 | | -2 |
|
Computerized Shutter Control of Canon DSLRs | Photo | | | 0 |
|
Binary clock using LED matrix to display a binary clock with 6 digits of 4 binary bits each | Timing | | | 0 |
|
Making an LM35 temperature recorder (based on PIC12F675) - logs to EEPROM | Data Acquisition | | | 0 |
|
Schematics and C code for a PIC frequency counter operating up to about 50 MHz (7 segment) | Test | | | -1 |
|
Universal Serial Infrared Receiver | IR | | | -1 |
|
Schematics and C code for a 0-5V PIC LCD volt meter | Test | | | 0 |
|
Driving led display matrix from a PIC micro | LED | | | -2 |
|
Schematics and C code for a PIC frequency counter operating up to about 50 MHz (LCD) | Test | | | -1 |
|
PIC sonar (ultrasonic) range finding project with seven segment display using PIC micro | Microcontroller | | | 0 |
|
A Real Time Clock IC (DS1307) project using the PIC micro | Microcontroller | | | -2 |
|
PIC Serial LCD project - An RS232 serial LCD interface using a standard HD44780 LCD | Microcontroller | | | -1 |
|
Stepper motor driver using PIC12F675 that offers serial port command interface | Control | | | 0 |
|
Stepper motor driver using PIC12F675 | Control | | | -1 |
|
Making an LM35 temperature recorder (based on PIC12F675) - serial output | Data Acquisition | | | -1 |
|
Infrared remote control with intervalometer function for Nikon cameras | Photo | | | 1 |
|
IR Remote Control for Nikon cameras, standard version | Photo | | | 0 |
|
Not So Tiny Power Meter - Measures power consumption for entire apartment
Not So Tiny Power Meter | Test | Feb 21, 2013 | | -1 |
|
Accelerometer with microcontroller and display | Data Acquisition | | | -1 |
|
Using a 555 Timer as an A/D converter | Data Acquisition | | | 0 |
|
Serial cable for Casio QV-200 digital camera | Photo | | | 0 |
|
Locomotive signal braking module | Models | | | 1 |
|
H-Bridge Motor Control with Power MOSFETS | Control | Mar 23, 2015 | | -1 |
|
Connect a Serial LCD Display to Raspberry Pi | Microcontroller | Mar 23, 2015 | | -2 |
|
DSP-RDF Doppler Radio Direction Finder circuit schematic - complete kit available | RF | Apr 14, 2011 | | 0 |
|
White LED Drive Circuit | LED | | | -1 |
|
Solar Powered Garden Light with PCB layout | Solar | Feb 25, 2011 | | 0 |
|
Low Power PLL FM Transmitter based on LMX1601 and Atmel ATtiny2313 or AT90S2313 microcontroller | Transmitters | | | 1 |
|
Simplest LED Flasher Circuit using a 2N2222 transistor
Simplest LED Flasher Circuit led | LED | | | -1 |
|
White LED Stroboscope | LED | Feb 25, 2011 | | 1 |
|
4th Order Butterworth filter schematic and calculator | Filter | Jan 16, 2010 | | -1 |
|
Wave Multiplier for music synthesizers | Music | Apr 27, 2003 | | 1 |
|
Infinite melody for music synthesizers | Music | | | 0 |
|
Nikon Coolpix 950 / 990 / 995 Flash-adapter | Photo | Sep 25, 2009 | | 0 |
|
Digital clock that receives and displays the time from the Rugby MSF radio transmission (PIC16F877) | Timing | | | -2 |
|
Remote shutter (or 'cable release') for SLR and DSLR cameras | Photo | | | 0 |
|
Transistor based single zone intruder alarm | Alarms | | | -1 |
|
CMOS single zone intruder alarm | Alarms | | | -1 |
|
Automatic Intruder Alarm - a simple single-zone burglar alarm circuit based on a 4011 quad NAND gate | Alarms | | | -1 |
|
Hijack alarm | Automotive | | | -2 |
|
Two-component metal detector using a 4093 | Metal | | | 6 |
|
Simple temperature regulated FAN speed controller | Control | | | -1 |
|
RS-232 to TTL Translator | Microcontroller | | | -1 |
|
Car acceleration meter | Automotive | | | -3 |
|
Serial port I/O interface using AVR microcontroller | Microcontroller | | | 0 |
|
150W audio amplifier that's cheap to build using TIP142 / TIP147 Darlington power transistors | Amplifiers | | | -5 |
|
Infrared motion detector circuit | IR | Nov 13, 2010 | | 0 |
|
LED based transistor tester
LED based transistor tester | Test | Oct 05, 2012 | | -1 |
|
A Scenix (and PIC) Programmer | Programmers | Jan 26, 2001 | | 0 |
|
Induced voltage sensor delta-peak trigger for coilgun | Misc | | | 0 |
|
Open loop pulse trigger module for coilgun | Misc | | | -1 |
|
Optical speed trap to measure the the velocity of the projectile | Misc | | | 0 |
|
Optical trigger module for coilgun | Misc | | | -1 |
|
Power MOSFET module for coilgun | Misc | | | 0 |
|
Three stage induced voltage triggered coilgun | Misc | | | 0 |
|
Thyristor fired coilgun circuit diagram | Misc | | | -1 |
|
KITT (from Knight Rider) Car scanner using incandescant lamps | Automotive | | | -1 |
|
Magnetic levitation project from Electronics Now, February 1996 | Misc | | | 0 |
|
LNS Technologies Levitator Kit circuit diagram | Misc | | | 0 |
|
Magnetic levitation project from Popular Electronics, May 1966 | Misc | | | 0 |
|
Magnetic levitation project from Popular Electronics, May 1989 | Misc | | | 0 |
|
Barry's magnetic levitation project | Misc | | | 0 |
|
Barry's Coilgun Mark I circuit diagrams | Misc | | | 0 |
|
Barry's Coilgun Mark II circuit diagrans | Misc | | | 0 |
|
Barry's Coilgun Mark III circuit diagrans | Misc | | | 0 |
|
Barry's Coilgun Mark IV circuit diagrans | Misc | | | 0 |
|
Circuit diagram for Coilgun Pistol Pskov 1100 | Misc | | | -1 |
|
MMC to PIC16F876 circuit diagram | Microcontroller | Jun 18, 2003 | | -1 |
|
Circuits for interfacing microcontrollers to a wide number of real-word interfaces | Microcontroller | | | -1 |
|
50O Load and Power Meter | RF | Feb 21, 2013 | | -1 |
|
Simple Audio Tone Control Circuit | Audio | Feb 21, 2013 | | 0 |
|
TTL pulse counter/logic probe | Test | | | -3 |
|
General purpose ISA interface card for PC | PC | | | -1 |
|
PC ISA Card Random Number Generator | PC | | | -1 |
|
Hardware Random Number Generator with an SX microcontroller | Microcontroller | | | -1 |
|
MIDI cable for Sound Blaster cards | PC | | | -1 |
|
PC ISA board containing a Z80 microprocessor (coprocessor card) | PC | | | -1 |
|
8088 maximum mode SBC | Microcontroller | Nov 16, 2002 | | -1 |
|
External antenna for the GPS-38, Magellan 2000, or Eagle Explorer GPS receivers | RF | May 01, 2004 | | 0 |
|
EZ80 single board computer schematic (Z80) | Microcontroller | Apr 27, 2003 | | -1 |
|
8051 Development System Circuit Board circuit diagram | Microcontroller | Jun 20, 2004 | | -1 |
|
Inexpensive infrared reflectometer | IR | | | 1 |
|
Sallen-Key Low Pass Filter Calculator (handles Butterworth filters, Bessel filters and Chebychev) | Filter | Jan 16, 2010 | | 0 |
|
Multi-User Jeopardy Game (Fastest Finger First) | Games | Oct 06, 2006 | | 1 |
|
Commodore RF modulator | Video | Jan 01, 2003 | | 0 |
|
Shadow activated (or hand wave) motion detector | Control | | | -1 |
|
Constant current LED driver circuit using LM334 plus a transistor | LED | Jul 11, 2012 | | 0 |
|
Laser light output intensity meter | Laser | Oct 06, 2006 | | 0 |
|
175KHz inductive pulse transmitter (PDF) | Transmitters | Jan 26, 2001 | | 0 |
|
175KHz inductive pulse receiver (PDF) | RF | Jan 26, 2001 | | 2 |
|
1-line telephone status indicator powered from a 3V battery (PDF) | Telephone | Jan 26, 2001 | | 0 |
|
1uS light pulse descriminator plus F to V converter (PDF) | Misc | Jan 26, 2001 | | 0 |
|
1.5V LED flasher B (PDF) | LED | Jan 26, 2001 | | 1 |
|
200-400 MHz voltage controlled oscillator (PDF) | RF | Jan 26, 2001 | | -1 |
|
20MHz VCSEL 3mW laser test circuit (PDF) | Laser | Jan 26, 2001 | | 0 |
|
20MHz laser light detector (PDF) | Laser | Jan 26, 2001 | | 2 |
|
Broadband 2MHz optical fiber receiver (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Line in use indicator that handles two independent phone lines (PDF) | Telephone | Jan 26, 2001 | | 0 |
|
3KHz low-pass filter plus audio amp (PDF) | Filter | Jan 26, 2001 | | 2 |
|
Low current LED flasher (PDF) | LED | Jan 26, 2001 | | 0 |
|
Pushbutton one-shot and latch (PDF) | Control | Jan 26, 2001 | | -1 |
|
Modulated light receiver circuit (PDF) | Misc | Jan 26, 2001 | | 1 |
|
Micro-power 40KHz burst laser diode driver (PDF) | Laser | Jan 26, 2001 | | 0 |
|
40KHz light receiver (PDF) | IR | Jan 26, 2001 | | 0 |
|
40KHz laser burst detector (PDF) | Laser | Jan 26, 2001 | | 0 |
|
40KHz TV-VCR repeater (PDF) | IR | Jan 26, 2001 | | 0 |
|
4-line telephone status indicator that is polarity independent (PDF) | Telephone | Jan 26, 2001 | | 0 |
|
1uS light pulse receiver plus post amp (MISC) | Misc | Jan 26, 2001 | | 0 |
|
Broadband 5MHz optical fiber receiver (PDF) | Misc | Jan 26, 2001 | | 0 |
|
5W Fluorescent light intensity modulator (PDF) | Lighting | Jan 26, 2001 | | 0 |
|
Line powered 60Hz clock generator (PDF) | Timing | Jan 26, 2001 | | 0 |
|
High-speed 75MHz light receiver (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Micro-power pulse generator (PDF) | Timing | Jan 26, 2001 | | 0 |
|
1.5V LED flasher A (PDF) | LED | Jan 26, 2001 | | 1 |
|
Flashing LED advertising badge (PDF) | LED | Jan 26, 2001 | | 0 |
|
Flashing LED advertising badge (PDF) | LED | Nov 17, 2002 | | 0 |
|
Honey Bee counter (PDF) | Data Acquisition | Jan 26, 2001 | | -1 |
|
Power reminder beeper (PDF) | Power | Jan 26, 2001 | | -1 |
|
Very loud beeper (PDF) | Audio | Jan 26, 2001 | | -1 |
|
Darkroom camera shutter timer | Photo | Jan 26, 2001 | | 0 |
|
Capacitance type liquid level measurement (PDF) | Data Acquisition | Jan 26, 2001 | | 0 |
|
Unplugged power cord alarm | Power | Jan 26, 2001 | | -1 |
|
Modulated laser diode tester (PDF) | Laser | Jan 26, 2001 | | 1 |
|
Divide by 1.5 counter (PDF) | Timing | Jan 26, 2001 | | 1 |
|
Door knob alarm (PDF) | Alarms | Jan 26, 2001 | | -1 |
|
Basement doorbell beeper (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Time to dust indicator - battery powered dust indicator (PDF) | Misc | Jan 26, 2001 | | -1 |
|
Charge coupled bi-directional power MOSFET relay (PDF) | Control | Jan 26, 2001 | | -1 |
|
Finger touch activated switch (PDF) | Control | Jan 26, 2001 | | 1 |
|
High-output square wave generator (PDF) | Timing | Jan 26, 2001 | | 0 |
|
1W Fluorescent lamp night light (PDF) | Lighting | Jan 26, 2001 | | 0 |
|
Water seepage alarm (PDF) | Alarms | Jan 26, 2001 | | -1 |
|
Machine vibration triggers hour meter (PDF) | Control | Jan 26, 2001 | | -1 |
|
LASER/LED light output intensity meter (PDF) | Laser | Jan 26, 2001 | | 0 |
|
Solid state relay (PDF) | Control | Jan 26, 2001 | | -1 |
|
Digital noise generator (PDF) | Audio | Jan 26, 2001 | | -1 |
|
D Flip-flot one-shot circuits (PDF) | Timing | Jan 26, 2001 | | 1 |
|
Low-power optical interrupter (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Micro-power over temperature alarm (PDF) | Alarms | Jan 26, 2001 | | -2 |
|
Machine power loss beepter (PDF) | Power | Jan 26, 2001 | | -1 |
|
Simple nitrogen spark generator (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Pulsed LED test circuit (PDF) | LED | Jan 26, 2001 | | 1 |
|
Low battery voltage flasher (PDF) | LED | Jan 26, 2001 | | 2 |
|
Video signal edge enhancement | Video | Jan 26, 2001 | | 1 |
|
Long-period watchdog timer | Microcontroller | Jan 26, 2001 | | 0 |
|
Line-powered Xenon flash transmitter (PDF) | Control | Jan 26, 2001 | | 0 |
|
9V Xenon photoflash controller (PDF) | Control | Jan 26, 2001 | | -1 |
|
Series Notch Fliter Designer / Calculator (displays circuit diagram after calculation) | Filter | Jan 16, 2010 | | 0 |
|
Cellular Phone calling Detector | Telephone | | | 0 |
|
7MHz QRP transmitter | Transmitters | Jul 09, 2002 | | 0 |
|
Tone display system | Audio | Oct 30, 2002 | | -1 |
|
Tube amplifier | Tube | Aug 14, 2002 | | -2 |
|
Analog Filters for Data Conversion (ADC filter) | Filter | Jan 16, 2010 | | 0 |
|
Simple DIY BFO metal detector | Metal | Jun 27, 2010 | | 4 |
|
Transducer Amplifiers | Data Acquisition | | | 0 |
|
Equivalent circuit and SPICE model of 555 timer | Timing | Apr 11, 2011 | | 0 |
|
ADC Input Driver DIFFERENTIAL to DIFFERENTIAL | Data Acquisition | Apr 11, 2011 | | 0 |
|
ADC Input Driver DIFFERENTIAL to SINGLE-ENDED | Data Acquisition | Apr 11, 2011 | | 2 |
|
ADC Input Driver FULLY DIFFERENTIAL AMPLIFIER | Data Acquisition | Apr 11, 2011 | | 0 |
|
ADC Input Driver SINGLE-ENDED to DIFFERENTIAL | Data Acquisition | Apr 11, 2011 | | -1 |
|
ADC Input Driver SINGLE-ENDED to SINGLE-ENDED | Data Acquisition | Apr 11, 2011 | | 1 |
|
Op-Amp Current Source with Floating Load including SPICE simulation | Power | Mar 26, 2011 | | -1 |
|
H-Bridge Power Amp circuit diagram and SPICE simulation files | Amplifiers | Jan 17, 2011 | | -6 |
|
Op Amp Comparator with Hysteresis with SPICE simulation | Misc | Mar 26, 2011 | | 1 |
|
Op Amp Precision Half-wave Rectifier including SPICE simulation | Misc | Mar 26, 2011 | | 0 |
|
Op Amp based PID Controller circuit with SPICE simulation | Control | Mar 26, 2011 | | -2 |
|
Op Amp Triangle-Wave Generator circuit diagram and SPICE simulation files | Timing | Jan 17, 2011 | | 0 |
|
RC Low-Pass Filter with Op Amp Buffer (single pole filter) with SPICE simulation files | Filter | Jan 17, 2011 | | 0 |
|
Single-Supply AC Inverting Op Amp amplifier with SPICE simulation | Misc | Mar 26, 2011 | | 0 |
|
Sallen-Key Low-Pass Filter (Double-Pole) with SPICE simulation files | Filter | Jan 17, 2011 | | 0 |
|
Wien Bridge Oscillator with SPICE simulation | Timing | Mar 26, 2011 | | -1 |
|
Basic Audio Amplifier including a SPICE model | Amplifiers | Apr 11, 2011 | | 0 |
|
Thermostat node schematic | Data Acquisition | Oct 31, 2002 | | 0 |
|
No-Hum Fan Controller | Control | Sep 13, 2006 | | -1 |
|
PIC Web Server Schematic | Microcontroller | Sep 13, 2006 | | -1 |
|
Micro based PIR to IR remote converter | IR | Oct 23, 2002 | | 0 |
|
DIY Microphone Cable for iPod Touch (2nd Gen) | PDA | Sep 25, 2009 | | 0 |
|
Hacking the Hot Wheels Radar Gun - includes circuit of analog front end | Misc | | | 0 |
|
Laser range finder and reflectivity meter for the MARS-96 international space project (PDF) | Laser | Oct 06, 2006 | | 1 |
|
12 Volt DC Fluorescent Lamp Driver | Lighting | Nov 13, 2010 | | 0 |
|
Battery juicer provides a night light from almost flat batteries that would otherwise be discharded | Lighting | Nov 13, 2010 | | 0 |
|
Beam-break Detector For Camera Shutter or Flash Control | Photo | Nov 13, 2010 | | 2 |
|
Dual Polarity Unregulated PSU For High-End Audio Amps | Power | Nov 13, 2010 | | -1 |
|
High Voltage Converter: 90V From 1.5V | Power | Nov 13, 2010 | | -1 |
|
Infra-red Light Barrier Using 555 | IR | Nov 13, 2010 | | 1 |
|
Infra-Red Sensor/Monitor | IR | Nov 13, 2010 | | 0 |
|
IR On/Off Switch Using a PIC12F629 Microcontroller | Microcontroller | Nov 13, 2010 | | -2 |
|
Infrared S/PDIF Receiver | IR | Nov 13, 2010 | | -1 |
|
RC5 Repeater to extend distance of infrared remote controls | IR | Nov 13, 2010 | | -2 |
|
Super Simple 3 Watt Audio Power Amplifier based on TDA1015 | Amplifiers | Nov 13, 2010 | | -1 |
|
Transistor Tester | Test | Nov 13, 2010 | | 0 |
|
VGA to BNC Adapter (Converter) | Video | Nov 13, 2010 | | 1 |
|
White LED Lamp | LED | Nov 13, 2010 | | -1 |
|
Wire Tracer (Receiver) | Test | Nov 13, 2010 | | 0 |
|
Wire Tracer (Transmitter) | Test | Nov 13, 2010 | | 0 |
|
PIC ICD | Microcontroller | Oct 23, 2002 | | -2 |
|
Dreamcast interface | Games | Aug 09, 2002 | | -4 |
|
Ultrasonic Range Finder & Imager | Data Acquisition | Jun 09, 2002 | | 1 |
|
iPod / USB MP3 charger using MC34063 switchmode regulator | PDA | | | 0 |
|
Elecraft XG2 receiver test oscillator (PDF) | Test | Sep 13, 2006 | | -1 |
|
Infrared beam barrier / proximity detector | IR | | | -1 |
|
Simple electronic buzzer | Audio | | | -1 |
|
Big Ben sound effects generator | Audio | | | -1 |
|
Charge Monitor for 12V lead acid battery | Power | | | 0 |
|
Wiper Speed Control | Automotive | | | 1 |
|
PC based Frequency Meter | PC | | | -1 |
|
7 segment rolling display using PC | PC | | | -1 |
|
JAM(Just A Minute) Quiz Game Circuit | Games | | | 1 |
|
Running Message Display | LED | | | 0 |
|
Simple car battery charger | Automotive | Jun 18, 2003 | | -1 |
|
Clap activated remote control | Control | | | -1 |
|
Contactless Mains Voltage Indicator | Test | | | -1 |
|
Automatic Staircase Light 1 | Lighting | | | 0 |
|
Automatic Staircase Light 2 | Lighting | | | 0 |
|
Clack Clack Electronic Bell | Audio | | | 0 |
|
Electronic Astrologer (decision maker) | Games | | | 0 |
|
Electronic dice | Games | | | 0 |
|
Light Operated Switch | Control | | | -1 |
|
Mini emergency light | Lighting | | | -1 |
|
Mini tester: Handles continuity testing, resistor testing, capacitor testing and diode testing | Test | | | 1 |
|
Musical Electronic Bell | Audio | | | -1 |
|
MW Transmitter can be used as an inter-room radio telephone | Transmitters | | | 0 |
|
NiCd Cell Charger | Power | | | -2 |
|
Pocket Transmitter that can cover 20 to 25 meters with a telescopic antenna | Transmitters | | | 1 |
|
Reflex Action Game | Games | | | 1 |
|
Simple Traffic Light Controller | Models | | | 0 |
|
Voice Amplifier | Amplifiers | | | -4 |
|
Discrete LED Color Organ | LED | | | 0 |
|
Automatic Plant Irrigation System Circuit for Watering Plants without any Human Interference. | Misc | Dec 07, 2014 | | -1 |
|
BCD to 7 Segment LED Display Decoder Circuit | LED | Apr 26, 2014 | | 1 |
|
25W MOSFET audio amplifier | Amplifiers | Feb 21, 2005 | | 2 |
|
50W audio amplifier using ICL8063 | Amplifiers | Feb 21, 2005 | | -4 |
|
Digital volume control | Audio | Feb 21, 2005 | | -2 |
|
Electronic attenuator | Audio | Feb 21, 2005 | | 1 |
|
Speech recorded using ISD2560 | Audio | Feb 21, 2005 | | -1 |
|
Precision audio millivoltmeter | Test | Feb 21, 2005 | | -5 |
|
Amplified ear for surveillance | Amplifiers | Feb 21, 2005 | | -2 |
|
Flashing / pulsing third brake like for cars | Automotive | Feb 21, 2005 | | -2 |
|
Headlight flasher | Automotive | Feb 21, 2005 | | -3 |
|
Speed alert - wireless portable unit | Automotive | Feb 21, 2005 | | 0 |
|
Parking aid senses distance to rear of vehicle | Automotive | Feb 21, 2005 | | -1 |
|
Automatic headlight brightness switch | Automotive | Feb 21, 2005 | | -1 |
|
Flashing heart | Games | Feb 21, 2005 | | -1 |
|
Electronic millipede robot | Models | Feb 21, 2005 | | 0 |
|
Circuit diagram of 3V LED chaser using 4017 | LED | Feb 21, 2005 | | 0 |
|
6V ultra-bright LED chaser using 74HC4017 | LED | Feb 21, 2005 | | 0 |
|
Smart card programmer | Programmers | Feb 21, 2005 | | 0 |
|
Decoder for encoded transmissions in Videocrypt and D2MAC | Video | Feb 21, 2005 | | 0 |
|
Circuit for gold wafer card | Misc | Feb 21, 2005 | | 1 |
|
Jupiter card programemr | Programmers | Feb 21, 2005 | | -1 |
|
PIC16F84 based diode tester | Test | Feb 21, 2005 | | -2 |
|
Nokia 3310 Lcd Thermometer using DS18B20 | Misc | Feb 21, 2005 | | 0 |
|
Lost keys finder using HCF4069 | Misc | Feb 21, 2005 | | 1 |
|
SmartCard PC Emulator | PC | Feb 21, 2005 | | -1 |
|
Economy radar detector | Automotive | Feb 21, 2005 | | -2 |
|
S-Video to RCA adapter | Video | Feb 21, 2005 | | 0 |
|
Digital pedometer circuit diagram | Medical | Feb 21, 2005 | | -1 |
|
Cellular Phone calling detector (detects RF field) | Telephone | Feb 21, 2005 | | 0 |
|
Cuckoo sound generator | Audio | Feb 21, 2005 | | -1 |
|
RS-232 Laser Transceiver | Laser | May 01, 2004 | | -1 |
|
RS-232 laser transceiver | Laser | Feb 21, 2005 | | -1 |
|
Casio datalogger | PDA | Feb 21, 2005 | | 1 |
|
Relay interface add-on board for PC | PC | Feb 21, 2005 | | -1 |
|
8-way relay interface board for PC parallel printer port | PC | Feb 21, 2005 | | -1 |
|
Stepper motor controller for PC parallel port | PC | Feb 21, 2005 | | -2 |
|
3-axis stepper motor controller for PC parallel port | PC | Feb 21, 2005 | | -2 |
|
Optically isolated stepper motor controller | Control | Feb 21, 2005 | | -1 |
|
PC based thermometer based on Dallas DS1621 | PC | Feb 21, 2005 | | -1 |
|
VGA to SCART adapter | Video | Feb 21, 2005 | | -4 |
|
Basic UPS Power Supply | Power | Feb 21, 2005 | | 0 |
|
Fuse monitor / alarm | Power | Feb 21, 2005 | | -1 |
|
4 watt FM transmitter circuit diagram | Transmitters | Feb 21, 2005 | | 0 |
|
FM transmitter bug | Transmitters | Feb 21, 2005 | | 0 |
|
Television signal amplifier | Video | Feb 21, 2005 | | -1 |
|
Small radio transmitter | Transmitters | Feb 21, 2005 | | 0 |
|
Electronic Eavesdropping Devices Detector (bug detector) | RF | Feb 21, 2005 | | -2 |
|
20dB VHF Amplifier | RF_Amplifier | Feb 21, 2005 | | 4 |
|
30 watt FM linear amplifier circuit diagram | RF_Amplifier | Feb 21, 2005 | | -2 |
|
AM transmitter | Transmitters | Feb 21, 2005 | | 0 |
|
2 Transistor FM Voice Transmitter | Transmitters | Feb 21, 2005 | | -1 |
|
Linear FM 50 watt amplifier with BLY90 | RF_Amplifier | Feb 21, 2005 | | 0 |
|
15 watt FM transmitter circuit schematic | Transmitters | Feb 21, 2005 | | -1 |
|
Video signal amplifier circuit | Video | Feb 21, 2005 | | 0 |
|
CB (27MHz citizens band) receiver | RF | Feb 21, 2005 | | -2 |
|
Circuit for three axis robot arm based on stepper motors out of 5 1/4" drives | Models | Nov 10, 2009 | | -1 |
|
Lightning Detector | Misc | Feb 21, 2005 | | -2 |
|
Geomagnetic field detector | Misc | Feb 21, 2005 | | -1 |
|
Frost alarm | Alarms | Feb 21, 2005 | | -1 |
|
Ultrasonic radar alarm | Alarms | Feb 21, 2005 | | -1 |
|
iRDA transceiver to extend IR port range up to 15 meters | IR | Feb 21, 2005 | | 0 |
|
Remote digital thermometer sends data over AC power line | Data Acquisition | Feb 21, 2005 | | 0 |
|
Telephone music on hold interface | Telephone | Feb 21, 2005 | | 0 |
|
Soft musical telephone ringer | Telephone | Feb 21, 2005 | | 0 |
|
Telephone amplifier | Telephone | Feb 21, 2005 | | 1 |
|
Telephone line monitor | Telephone | Feb 21, 2005 | | 0 |
|
Cut telephone line detector | Telephone | Feb 21, 2005 | | 0 |
|
FM telephone line bug transmitter (88MHz to 94MHz) | Telephone | Feb 21, 2005 | | 0 |
|
Continuity tester using transistors | Test | Feb 21, 2005 | | -2 |
|
Latching continuity tester using 4093 | Test | Feb 21, 2005 | | -1 |
|
IR remote control tester | IR | Feb 21, 2005 | | 0 |
|
Linear Resistance Meter | Test | Feb 21, 2005 | | -2 |
|
Crystal tester circuit diagram | Test | Feb 21, 2005 | | 0 |
|
Capacitance meter | Test | Feb 21, 2005 | | 1 |
|
Digital voltmeter (DVM) | Test | Feb 21, 2005 | | -1 |
|
Transistor tester using 555 timer and 4027 | Test | Feb 21, 2005 | | -3 |
|
Function generator based upon 8038 waveform generator IC | Test | Feb 21, 2005 | | 0 |
|
Triangle / Square wave generator | Timing | Feb 21, 2005 | | 0 |
|
Picoammeter circuit schematic with 4 ranges using CA3420 | Test | Feb 21, 2005 | | -2 |
|
Beeper to find short circuits (continuity tester) | Test | Feb 21, 2005 | | 1 |
|
Voltage follower with 1G ohm input resistance | Data Acquisition | Feb 21, 2005 | | 0 |
|
Led display digital Voltmeter | LED | Feb 21, 2005 | | 0 |
|
MOSFET tester for N-type MOSFET transistors | Test | Feb 21, 2005 | | -1 |
|
Inductive meter adapter to measure inductance using a frequency counter | Test | Feb 21, 2005 | | -1 |
|
Crystal tester that covers a range of 32kHz to 24MHz | Test | Feb 21, 2005 | | -1 |
|
Oscilloscope testing module (Huntron circuit) that shows Lissajous patterns | Test | Feb 21, 2005 | | -1 |
|
Voltage monitor with LED indicator | Power | Feb 21, 2005 | | -2 |
|
Logic probe with 7-segment display based on 74LS00 and 74LS47 | Test | Feb 21, 2005 | | -1 |
|
Wireless transmitter for PIR using Holtek HT12E | Transmitters | | | 0 |
|
OPT301 Laser receiver | Laser | | | 1 |
|
Heartbeat transducer using infrared LED / detector | Medical | | | 0 |
|
ECG amplifier with right leg drive | Medical | | | 1 |
|
High current regulated power supply | Power | Oct 31, 2002 | | -1 |
|
Low-voltage light dimmer | Lighting | Nov 17, 2002 | | -1 |
|
Active bandpass filters | Filter | Nov 01, 2002 | | 1 |
|
Bandpass filters | Filter | Nov 01, 2002 | | -1 |
|
AM BCB radio receiver | RF | Oct 23, 2002 | | 0 |
|
Regenerative shortwave receiver | RF | Jun 08, 2002 | | -1 |
|
Miniature audio amplifier | Amplifiers | | | -2 |
|
Optical Heart Rate Monitor | Medical | Sep 10, 2006 | | -2 |
|
PIC Project #1 - RS232 to I2C Interface | Microcontroller | Jan 26, 2001 | | -1 |
|
RF front-end for triple conversion GPS receiver (PDF) | RF | Mar 01, 2003 | | 1 |
|
Design and build your own iPod docking station | PDA | May 30, 2007 | | 0 |
|
Various tube crossover circuits | Tube | Jan 31, 2003 | | 0 |
|
Serial Port A/D-converter | Data Acquisition | Jan 26, 2001 | | -1 |
|
Audio amplifier output relay delay | Amplifiers | Jan 26, 2001 | | -2 |
|
TV/Radio antenna cable galvanic isolator | Video | Jan 26, 2001 | | 0 |
|
Audio line isolator | Audio | Jan 26, 2001 | | -2 |
|
Connect two CD-ROM drives to one soundcard | PC | Jan 26, 2001 | | -1 |
|
Centronics port D/A converters and low-pass filter | Data Acquisition | Jan 26, 2001 | | 0 |
|
4-channel dimmer rack circuit diagram | Lighting | Nov 17, 2002 | | 2 |
|
Dynamic microphone to electret microphone input | Audio | Jan 26, 2001 | | -1 |
|
Fogger smoke machine controller | Misc | Jan 26, 2001 | | 0 |
|
Headphone driving circuit for soundcards | PC | Jan 26, 2001 | | -1 |
|
Simple line mixer | Music | Jan 26, 2001 | | 0 |
|
Simple IR transmitter circuit | IR | Jan 26, 2001 | | 0 |
|
Simple infra-red detector | IR | Jan 26, 2001 | | 1 |
|
Experimental laser data link | Laser | Jan 26, 2001 | | 0 |
|
Simple light sensor adapter for oscilloscope | Test | Jan 26, 2001 | | -1 |
|
Line level signal to microphone input adapter | Audio | Jan 26, 2001 | | -2 |
|
Simple two line output combiner | Audio | Jan 26, 2001 | | -1 |
|
Adjustable power supply using LM317 | Power | Jan 26, 2001 | | -2 |
|
Get power out of PC parallel port | PC | Jan 26, 2001 | | -1 |
|
Simple microphone preamplifier | Preamp | Jan 26, 2001 | | 1 |
|
Electret microphone powering circuits | Audio | Jan 26, 2001 | | -2 |
|
Simple MIDI tester | Music | Jan 26, 2001 | | 0 |
|
Null Printer Adapter | PC | Jan 26, 2001 | | -1 |
|
PC speaker volume control circuit | PC | Jan 26, 2001 | | -1 |
|
Use amplifier phono input as line level input | Amplifiers | Jan 26, 2001 | | -2 |
|
How to get power from PC to your circuits | PC | Jan 26, 2001 | | -1 |
|
Simple +5V power supply circuit | Power | Jan 26, 2001 | | -1 |
|
RS-232 surge protection | PC | Jan 26, 2001 | | -1 |
|
Simple RS-232 serial port buffer circuit | PC | Jan 26, 2001 | | -1 |
|
Get power out of PC RS-232 port | PC | Jan 26, 2001 | | -1 |
|
Sound Blaster Microphone Preamplifier | PC | Jan 26, 2001 | | -2 |
|
Sega 3D glasses interface circuit diagrams | PC | Jan 26, 2001 | | -1 |
|
0-10V control for RC servos | Models | Jan 26, 2001 | | 0 |
|
Speaker signals to line level inputs | Audio | Jan 26, 2001 | | -1 |
|
S-video to composite video adapter | Video | Jan 26, 2001 | | 1 |
|
TDR cable reflection tester (Time Domain Reflectometer) | Test | Sep 21, 2006 | | 0 |
|
Telephone privacy adapter | Telephone | Jan 26, 2001 | | 1 |
|
Telephone ringing circuits | Telephone | Jan 26, 2001 | | 0 |
|
Simple circuit to connect telephone equipment to audio mixer | Telephone | Jan 26, 2001 | | 1 |
|
VGA to RGB + composite sync -converter | Video | | | -2 |
|
VGA to TV converter | Video | Jan 26, 2001 | | -3 |
|
VGA to PAL and NTSC converter | Video | Jan 26, 2001 | | 0 |
|
A-weighting filter from an old Ampex service manual | Filter | May 07, 2010 | | 0 |
|
Convert Atari-style joystick to PC joystick port | PC | Jan 26, 2001 | | -1 |
|
Fake Joystick circuit | PC | Jan 26, 2001 | | -1 |
|
Using the joystick port as general purpose input | PC | Jan 26, 2001 | | -1 |
|
Connect other circuits to PC joystick port | PC | Jan 26, 2001 | | -1 |
|
HeNe laser power supply | Laser | Jun 09, 2002 | | -2 |
|
Video/Audio Wireless Transmitter | Video | Oct 23, 2002 | | -2 |
|
Using an ADXL330 accelerometer with an AVR microcontroller | Microcontroller | Jan 09, 2010 | | -1 |
|
Peggy - A Light Emitting Pegboard Display | LED | | | -2 |
|
LPG leakage alarm using SEN-1327 gas sensor module (detects 4 other dangerous gases) | Alarms | Jul 17, 2012 | | -2 |
|
Build your own iRDA SIR Transceiver (Dongle) using MCP2120 | PC | Aug 27, 2003 | | -2 |
|
Programmable Optical Slave Flash Trigger for Digital Cameras using PIC12F675 | Photo | | | 1 |
|
7MHz SSB Transceiver | RF | May 01, 2004 | | -1 |
|
Homebuilt MP3 Player | Music | | | 0 |
|
5 Zone Alarm Circuit circuit diagram | Alarms | | | -1 |
|
Strain gauge sensor interface | Data Acquisition | | | 0 |
|
Ultrasonic Distance Measurer based on Freescale MC9RS08KA2 (PDF) | Microcontroller | | | -1 |
|
Model 2030 XRAY monitor instruction manual including schematics (PDF) | Medical | Sep 13, 2006 | | 3 |
|
Rangefinder with Fast Multiple Range Capability | Laser | Oct 06, 2006 | | 0 |
|
Laser diode transmitter RF section | Laser | | | 1 |
|
DC Fault Protection Circuit for Audio Amplifiers | Amplifiers | Jan 29, 2010 | | -3 |
|
Soft Power On Tester for Amplifiers | Test | Jan 29, 2010 | | 0 |
|
Zonk Machine and Treble Booster | Music | Jan 31, 2003 | | 2 |
|
Pulse Induction Metal Detector part 1 (PDF) | Metal | Jun 27, 2010 | | 2 |
|
Pulse Induction Metal Detector part 2 (PDF) | Metal | Jun 27, 2010 | | -8 |
|
Lightning shutter trigger for a camera using an Arduino | Arduino | Nov 13, 2010 | | -1 |
|
Camera Axe open hardware and open software project for camera triggering | Photo | Nov 13, 2010 | | 0 |
|
Direction sensing infrared motion detector using PIR (PDF) | IR | | | 0 |
|
Universal telephone hold | Telephone | Jan 26, 2001 | | 0 |
|
Video switcher - run up to four cameras into one video monitor (PDF) | Video | | | 0 |
|
Talking phone dial monitor (PDF) | Telephone | Jan 26, 2001 | | -1 |
|
Stepper motor positioner | Control | Jan 26, 2001 | | -1 |
|
Infrared Motion Detector using a PIR sensor (PDF) | IR | | | 1 |
|
Pyroelectric Infrared (PIR) Sensor | IR | Jan 26, 2001 | | -1 |
|
Mobile APRS / GPS tracking system | Misc | May 01, 2004 | | 0 |
|
GPS receiver support kit | Misc | May 01, 2004 | | 0 |
|
GPS receiver (Gamin, Eagle etc) to PC interface cables | PC | Mar 23, 2003 | | -1 |
|
Heart of LEDs | LED | Oct 23, 2002 | | 1 |
|
Christmas Star | LED | Oct 23, 2002 | | -1 |
|
Christmas tree | LED | Oct 23, 2002 | | -1 |
|
Simple Skype VoIP analog adapter | Telephone | Sep 10, 2006 | | 0 |
|
Brain-Wave Machine | Medical | Nov 27, 2002 | | 2 |
|
Cranial Electrotherapy Stimulation (CES) circuit diagram | Medical | | | -1 |
|
Lie detector | Medical | Oct 30, 2002 | | 4 |
|
Simple lie detector | Medical | Oct 30, 2002 | | 0 |
|
Furby reverse-engineered circuit | Games | Apr 27, 2003 | | 0 |
|
Circuit and Arduino sketch for interfacing to a DS18B20 1-wire temperature sensor | Arduino | Jul 21, 2013 | | -2 |
|
TXTVb - 70cm ATV Test Generator (PDF) | Test | | | -1 |
|
BCD readout frequency counter | Test | Aug 18, 2009 | | -1 |
|
Binary clock circuit diagram | Timing | Aug 18, 2009 | | 0 |
|
Experimental DDS frequency synthesizer uses the AD9851 | Timing | Oct 08, 2009 | | -1 |
|
Dekatron circuit diagram - device used for dividing by 10 during the valve era | Tube | Oct 25, 2009 | | 0 |
|
Circuit diagrams for making logic gates from discrete components | Misc | Oct 25, 2009 | | 0 |
|
Simple intercom circuit diagram | Telephone | Oct 25, 2009 | | -1 |
|
LCD Frequency Counter | Test | Aug 18, 2009 | | 0 |
|
Circuit for remote lighting controller using a 433MHz AM keyfob transmitter | Lighting | Oct 25, 2009 | | 0 |
|
LED matrix clock circuit diagram | Timing | Aug 18, 2009 | | 1 |
|
Miniscope - simple all-valve 1-inch CRT oscilloscope | Tube | Oct 25, 2009 | | 1 |
|
Positive Feedback Circuit for Isometric Muscle Experiments | Medical | Nov 05, 2009 | | 1 |
|
Z80 Computer circuit diagram | PC | Aug 18, 2009 | | 1 |
|
Giant nixie clock circuit diagram | Tube | Aug 18, 2009 | | 0 |
|
Panel-mounting clock circuit diagram | Timing | Aug 18, 2009 | | 0 |
|
Basic 78xx series regulator mains power supply circuit diagram | Power | Oct 25, 2009 | | -2 |
|
Simple QRSS callsign keyer based on an Atmega AVR programmed in C | Programmers | Nov 05, 2009 | | 0 |
|
Panel Mounting Radio Frequency Counter | Test | Aug 18, 2009 | | -1 |
|
Giant T-shaped LED matrix display board for financial applications containing 275 8x8 LED modules | LED | Oct 25, 2009 | | -1 |
|
Simple Frequency Counter | Test | Aug 18, 2009 | | -1 |
|
Sidereal clock project with circuit diagrams | Timing | Aug 18, 2009 | | 1 |
|
Heathkit signal generator user manual and circuit diagram | Test | Oct 25, 2009 | | -1 |
|
Spectrum analyzer Mk 1 | Test | Aug 18, 2009 | | 3 |
|
Spectrum analyzer Mk 2 | Test | Aug 18, 2009 | | 1 |
|
TinyScope - simple all-valve 1-inch CRT oscilloscope | Tube | Oct 25, 2009 | | 0 |
|
Asynchronous 40-bit TTL CPU | Microcontroller | Aug 18, 2009 | | -1 |
|
USB charger circuit diagram | Power | Aug 18, 2009 | | 0 |
|
Z80 controlled Viscometer project | Test | Aug 18, 2009 | | 0 |
|
Wind speed logger | Data Acquisition | Oct 25, 2009 | | 1 |
|
Wind speed logger Mk2 | Data Acquisition | Oct 25, 2009 | | 0 |
|
The Great Z80 Computer Project | PC | Aug 18, 2009 | | 0 |
|
AVR-Based Serial Port IR Receiver | Microcontroller | Oct 23, 2002 | | -1 |
|
Ethernet interface for Commodore 64 computer | PC | | | -2 |
|
i2c-tiny-usb, a simple i2c interface for the usb port | PC | | | -1 |
|
LCD2USB, cheap open source text LCD interface | PC | | | -1 |
|
LEDMATRIX, a 80x32 pixel DIY LED matrix display | LED | | | 1 |
|
Interfacing ADXL202 accelerometer to PalmPilot | PDA | Apr 27, 2003 | | -1 |
|
SPI2CF, a fast and efficient WLAN interface for the AVR | Microcontroller | | | -1 |
|
TiltStick, a motion sensing device (USB interface to accelerometer) | PC | | | -1 |
|
Minimum Theremin Kit Schematic | Audio | Sep 13, 2006 | | -1 |
|
FM radio for a PIC (uses TDA7000 IC which is now obsolete) | PC | Sep 08, 2009 | | -1 |
|
Lightning detector circuit diagram | Misc | Sep 08, 2009 | | 0 |
|
Build an iButton electronic lock based around a AT91C2051 microcontroller (includes ASM source code) | Alarms | Nov 10, 2009 | | -1 |
|
AM receiver circuit diagram | RF | Sep 08, 2009 | | 0 |
|
Using an Apple II+ Computer as a Flash Intervalometer (PDF) | Photo | May 09, 2010 | | 1 |
|
Heathkit Groundtrack GR-1290 VLF metal detector circuit diagram and detector coil construction notes | Metal | Jun 27, 2010 | | -5 |
|
White's Surfmaster PI (pulse induction) metal detector schematic diagram | Metal | Jun 27, 2010 | | 5 |
|
Ultrasonic Radar Alarm Circuit Diagram | Alarms | | | -1 |
|
10 tricks for interfacing to the PIC16C508 | Microcontroller | Nov 05, 2009 | | -1 |
|
Circuit to connect a rotary encoder to a Arduino UNO | Arduino | Jul 21, 2013 | | -1 |
|
555 Based Simple Servo Controller | Control | | | 1 |
|
Fluorescent Tube "Strip light" Driver | Lighting | | | 0 |
|
Field Strength Meter (FSM) covers 2Mhz - 1Ghz with peak reception at 3-200Mhz | Test | | | 0 |
|
Simple Function Generator using TL084 or other opamp | Timing | | | -2 |
|
H Bridge controller for DC motors | Control | | | 0 |
|
Advanced High Voltage PSU circuit | Power | | | -1 |
|
Authentic Looking Knight Rider Led Project | Automotive | | | -1 |
|
6 Pole ElectroMagnet Motor (aka Simple Brushless motor) | Misc | | | -1 |
|
88-108Mhz FM Radio Transmitter with 3 transistor stages | Transmitters | | | 1 |
|
Serial servo controller for interfacing hobby servos via RS232 to a PC | PC | | | -1 |
|
Solid State Tesla Coil and Wireless Power | Misc | | | 0 |
|
Tesla coil construction project | Misc | | | 0 |
|
12 Vdc - 120 Vac Inverter Schematic | Power | Jan 01, 2003 | | -2 |
|
POV Persistence Of Vision 2 x 32 LED display | LED | | | 1 |
|
Vareity of circuits for interfacing to/from TTL logic | Misc | | | 0 |
|
Victoria TAFE programmer (based on AT89C2051) | Programmers | Jan 31, 2003 | | 0 |
|
JDM programmer circuit diagram | Programmers | Jan 31, 2003 | | 0 |
|
PIC micro programmer circuit diagram | Programmers | Jan 31, 2003 | | -1 |
|
Dinsmore 1490 digital compass | Misc | Nov 29, 2002 | | 0 |
|
Geiger counter circuit diagram | Misc | Nov 29, 2002 | | -2 |
|
Speech recognition using HM2007 | Microcontroller | Nov 29, 2002 | | -1 |
|
PIC microcontroller servo motor interface | Microcontroller | Nov 29, 2002 | | -1 |
|
PIC micro multiple servo motor interface | Microcontroller | Nov 29, 2002 | | -1 |
|
Electric field disturbance monitor | Misc | Jan 26, 2001 | | 0 |
|
3 KHz low pass filter plus audio amplifier circuit diagram | Filter | Apr 14, 2010 | | 1 |
|
Micropower pulse generator (PDF) | Timing | Jan 26, 2001 | | 0 |
|
Inexpensive seismometer project | Misc | Dec 15, 2002 | | 0 |
|
Constant current LED driver circuit using an NPN transistor to control an N-channel MOSFET | LED | Jul 11, 2012 | | 0 |
|
Simple 430MHz band FM transmitter uses only 2 FETtransistors | Transmitters | | | 0 |
|
110mW emitter follower audio power amplifier | Amplifiers | Jan 22, 2010 | | -3 |
|
AM transmitter using no power supply | Transmitters | | | 3 |
|
NE555 drives a speakes: Pulse Width Modulation Amplifier | Amplifiers | Mar 30, 2010 | | -5 |
|
UHF signal generator | Test | | | 0 |
|
VHF signal generator | Test | | | 0 |
|
Judge Dredd pinball locking ring modification | Games | | | 0 |
|
PIC micro frame grabber (TDA8708) | Video | Feb 01, 2003 | | 0 |
|
Digitally Addressable DALI Dimming Ballast (PDF) | Lighting | Dec 27, 2004 | | 0 |
|
New and Improved Sound Card Packet Interface tested with PSK31 and APRS | PC | Oct 27, 2009 | | -1 |
|
Home security project | Alarms | Nov 17, 2002 | | -1 |
|
PC Controlled RC car construction project | Models | | | 0 |
|
Pulse Circuits for Infrared LEDs and Visible Diode Lasers | Laser | Aug 04, 2012 | | -1 |
|
Pulse Circuits for Infrared LEDs and Visible Diode Lasers | Laser | Mar 04, 2010 | | 2 |
|
LED Modulation Circuits including 5MHz and 50MHz versions | LED | Apr 17, 2011 | | 0 |
|
Measuring the speed of light with an infrared LED / photodiode (TDOA) | IR | Jun 13, 2011 | | 0 |
|
Canon DSLR cable shutter release usin 4N25 for optical isolation | Photo | Sep 25, 2009 | | 0 |
|
Spatial Distortion Reduction Headphone Amp | Amplifiers | Jan 31, 2003 | | -2 |
|
Simple GPS Stabilised 10 MHz Oscillator | Timing | | | 1 |
|
Sanyo 20EZ monitor circuit diagram | PC | Mar 18, 2003 | | -1 |
|
Burger Time Arcade Game circuit diagram (PDF) | Games | Mar 17, 2009 | | -1 |
|
Dig Dug Arcade Game (800k ZIP) | Games | Mar 18, 2003 | | 1 |
|
Frogger Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | -1 |
|
Frogger Sound/ROM - FROGSND Arcade game circuit diagram (PDF) | Games | Mar 30, 2014 | | 0 |
|
Gyrus Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | 0 |
|
Junior Pacman Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | 1 |
|
Ladybug Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | 1 |
|
Mappy Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | 0 |
|
Moon Cresta Arcade circuit diagram (PDF) | Games | Mar 18, 2003 | | 0 |
|
Mr.Do Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | 0 |
|
Pengo Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | 0 |
|
PacLand Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | 0 |
|
Q*Bert Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | 0 |
|
Qix Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | 0 |
|
Scramble Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | -2 |
|
Time Pilot'84 Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | -1 |
|
Xevious Arcade Game circuit diagram (PDF) | Games | Mar 18, 2003 | | -1 |
|
Robotic microcontroller board | Models | Jan 31, 2003 | | 0 |
|
Single to 3-phase power conversion | Power | | | -1 |
|
Low noise PIN diode laser receiver circuit | Laser | | | 0 |
|
Circuits for biasing and modulating laser diodes | Laser | | | 0 |
|
inexpensive high speed microwave data link using an Alpha Gunnplexer for 10 Mbps data rate | RF | | | 0 |
|
18 dB LT1253 DDS amplifier circuit diagram | RF_Amplifier | | | 0 |
|
23 dB Bipolar DDS Amplifier | RF_Amplifier | | | 0 |
|
15M CW Transceiver design | RF | | | 0 |
|
20 Meter CW Transceiver | RF | | | 2 |
|
30 Meter, Discrete Component CW Transceiver Built Manhattan-style | RF | | | 0 |
|
K8IQY's Original 2N2/40 CW Transceiver Rig | RF | | | 0 |
|
40 to 6 Meter "No Tune" Transverter | RF | | | 0 |
|
SW30+ 30 Meter CW Transceiver | RF | | | 0 |
|
-20 dB Couplers for use with a with a spectrum analyzer or other sensitive detector | Test | | | 0 |
|
-20 dBm, 14.060 MHz Precision Signal Source | Test | | | 0 |
|
RC Audio Oscillator | Audio | | | -1 |
|
Precision VXO for Crystal Characterization & Matching | Test | | | 0 |
|
Return Loss Bridge | Test | | | -1 |
|
Lossless portable digital audio player using the Microchip PIC32 | Music | | | -1 |
|
Water system controller (PDF) | Control | | | -1 |
|
GPS LCD Display Project | Microcontroller | Jul 24, 2002 | | -1 |
|
PIC16F84 LED chaser | Microcontroller | Nov 17, 2002 | | -1 |
|
PIC micro LED projects | Microcontroller | Jun 18, 2003 | | -1 |
|
PS/2 keyboard keystroke logger based on Atmel 89C2051 | Microcontroller | Jun 20, 2004 | | -1 |
|
Breadboard supply - very low dropout adjustable power supply | Power | Oct 12, 2009 | | 0 |
|
Bedazzler: Do-it-yourself Handheld LED-Incapacitator (non-lethal weapon) | LED | Oct 12, 2009 | | 0 |
|
Dimmable Li-Ion Halogen Bike Light | Lighting | Oct 12, 2009 | | 0 |
|
Solderless Breadboard Arduino Clone for Arduino prototyping | Arduino | Oct 12, 2009 | | -1 |
|
Digg Button Kit | Misc | Oct 12, 2009 | | 0 |
|
Drawdio - A very simple musical synthesizer that uses the conductive properties of pencil graphite | Music | Oct 12, 2009 | | 0 |
|
Ethernet shield for Arduino (Xport) | Arduino | Oct 12, 2009 | | -1 |
|
Fuzebox - open source 8-bit game console based on Atmel ATmega644-20PU | Games | Oct 12, 2009 | | 0 |
|
GPS / Datalogging shield for Arduino microcontroller | Arduino | Oct 12, 2009 | | 0 |
|
Ice Tube Clock - Vacuum fluorescent display (VFD) clock | Tube | Oct 12, 2009 | | 0 |
|
Real-world MIDI interface platform project including circuit diagram and PCB design files | Music | Oct 12, 2009 | | 0 |
|
Persistance of vision (POV) toy | Games | Oct 12, 2009 | | 0 |
|
Portable MP3 music player | Music | Oct 12, 2009 | | 0 |
|
Small battery-powered USB charger including circuit diagram and PCB layout | Power | Oct 12, 2009 | | 0 |
|
Arduino based controller interface for servo motors, stepper motors and DC motors | Arduino | Oct 12, 2009 | | 0 |
|
Arduino microcontroller prototyping system | Arduino | Oct 12, 2009 | | -1 |
|
SIM card reader circuit diagram | Misc | Oct 12, 2009 | | 0 |
|
Persistence of Vision Display for Bikes | LED | Oct 12, 2009 | | 0 |
|
High power infrared remote control to turn off television sets from a distance | IR | Oct 12, 2009 | | 0 |
|
USBtinyISP - AVR programmer & SPI interface project | Programmers | Oct 12, 2009 | | 0 |
|
Wave Bubble self-tuning portable RF jammer | RF | | | 0 |
|
Wave Bubble - A design for a self-tuning portable RF jammer | RF | Oct 12, 2009 | | 1 |
|
Wave (Audio) shield for Arduino microcontroller | Arduino | Oct 12, 2009 | | 0 |
|
Bassline synthesizer/sequencer | Music | Oct 12, 2009 | | -3 |
|
YBox2 - DIY networked set-top box that connects to a TV to deliver Internet content | Video | Oct 12, 2009 | | 1 |
|
Mini-Beacon - miniature programmable LED Flasher that is based around a PIC12F629 microcontroller | LED | | | 0 |
|
Subwoofer Filter, Gainer, Auto Power System | Audio | | | -1 |
|
PC-based ISA data acquisition and control board | PC | Sep 13, 2006 | | -1 |
|
Circuit for driving a liquid crystal (LCD) shutter to simply pass or block light | Misc | Dec 21, 2009 | | 0 |
|
Linux Infra-red Remote Control (LIRC) | PC | Apr 12, 2001 | | -2 |
|
Simple home made ADS-B receiver that takes IF from a modified receiver | RF | Oct 04, 2010 | | 1 |
|
Very Simple ADSB Receiver using a TV tunder to allow reception of aircraft transponders | RF | Oct 04, 2010 | | 0 |
|
115200 RS232 QPSK RF modem project | RF | Oct 04, 2010 | | 0 |
|
Build your own MARES dive computer IRIS interface for RS232 | PC | Oct 04, 2010 | | -1 |
|
3.3V / 5V Regulated Power Supply Circuit | Power | Jul 03, 2011 | | 2 |
|
Acceleration Sensing - gesture controllers for robotic musical instruments | Models | Jan 09, 2010 | | 1 |
|
Distance Sensing - devices for wireless distance and position determination | Models | Jan 09, 2010 | | 0 |
|
Doppler radar based gesture measurement system capable of delivering positional information | Models | Jan 09, 2010 | | 0 |
|
Infrared Body Sensing | IR | Jan 09, 2010 | | 0 |
|
Homebuilt RS232 LCD Interface | PC | Jun 18, 2003 | | -1 |
|
Lie detector | Misc | | | 0 |
|
Project to capture infrared remote control signals and play them back, based on Atmel ATMEGA48 micro | IR | Jan 17, 2010 | | 0 |
|
MIDI Controller Footpedal | Music | Aug 14, 2002 | | 0 |
|
DIY Serial MIDI Interface (80C51/80C31 Version) | Music | Aug 14, 2002 | | 0 |
|
Homemade Serial to Nokia MBus Interface on a PCB, without using Zener diodes | PC | | | -1 |
|
Microcontroller sensor and actuator interfaces | Microcontroller | Apr 27, 2003 | | -1 |
|
Hi-Fi Preamp with remote-control and other advanced features | Preamp | | | -2 |
|
Actvie speaker based on a dual op-amp (LM833) and TDA2030 power amp | Amplifiers | | | -3 |
|
4 channel power amplifier with bi-amping and bridging options | Amplifiers | | | -1 |
|
Amplifier based on LM4780 including a thermal shutdown feature | Amplifiers | | | -1 |
|
Lead-Acid Battery Monitor | Power | | | 0 |
|
Complete Design for Giant 8-foot LCD Counter (Zip file) | Microcontroller | Mar 27, 2009 | | -1 |
|
PIC12C509 logic gate replacement for nitrogen filler (ZIP file) | Microcontroller | Mar 01, 2003 | | -1 |
|
PIC demo board | Microcontroller | Oct 31, 2002 | | -1 |
|
Disco light controller (ZIP file) | Lighting | Mar 01, 2003 | | 0 |
|
DS1821 programmable thermostat | Control | Mar 01, 2003 | | -1 |
|
PIC12C509 Gym Timer (ZIP file) | Microcontroller | Mar 01, 2003 | | -1 |
|
PIC LCD and Keypad driver | Microcontroller | Oct 31, 2002 | | -2 |
|
PIC12C508 Phase Controller for 2kW heater (ZIP file) | Microcontroller | Mar 01, 2003 | | -1 |
|
PIC16F84 TRIAC / IGBT brightness phase controller | Microcontroller | Mar 01, 2003 | | 0 |
|
PIC16F84 pulse monitor with date/time output (ZIP) | Microcontroller | Mar 01, 2003 | | -1 |
|
Simple metal detector based on a PIC12F683 microcontroller | Metal | Jun 27, 2010 | | -2 |
|
Three component bat detector based on a PIC12F683 microcontroller | Misc | Jun 27, 2010 | | -1 |
|
Mini oscilloscope based on PIC18F4620 and standard 16x2 text LCD display module | Test | Jun 27, 2010 | | 2 |
|
PIC based touch clock that demonstrates interfacing a PIC microcontroller to an LCD touch panel | Microcontroller | Jun 27, 2010 | | -1 |
|
Pico OSD, a PIC video superimposer | Video | Jun 27, 2010 | | 0 |
|
A PIC16F84A Alarm Clock | Microcontroller | Jun 27, 2010 | | 0 |
|
PIC16F877A Thermometer with MCP9700A sensor | Data Acquisition | Jun 27, 2010 | | 0 |
|
A Voice Controlled LED Light Show using a VRStamp | Microcontroller | Jun 27, 2010 | | -1 |
|
PIC PAL Video Library including source code and circuit schematics | Video | Jun 27, 2010 | | 0 |
|
Cheap Ultrasonic Range Finder based on a PIC microcontroller | Microcontroller | Jun 27, 2010 | | -1 |
|
Cheap Ultrasonic Range Finder based on PIC16F877A with a 8MHz crystal | Microcontroller | | | 0 |
|
A PIC16F819 Dymoclock (also demonstrates interfacing 30 LEDs to a PIC using only six I/O pins) | Microcontroller | Jun 27, 2010 | | -1 |
|
MemoSound game based on a PIC16F84A | Games | Jun 27, 2010 | | -2 |
|
EasyPic2 with on-board Ethernet Adapter | Microcontroller | Jun 27, 2010 | | -1 |
|
Automatic LED display dimmer using a LED as a light sensor | LED | Jun 27, 2010 | | -2 |
|
DCF-77 PIC LED clock (DCF77 is the name of a German radio station on 77.5 KHz) | Timing | Jun 27, 2010 | | 0 |
|
DCF77 PIC16F84A Single-Nixie clock (DCF77 is the name of a German radio station on 77.5 KHz) | Tube | Jun 27, 2010 | | 0 |
|
Yaesu FT-736R doppler compensation | RF | Aug 14, 2002 | | 0 |
|
AI-1 ("All-in-one") Remote - photographic accessory that you can build | Photo | | | 0 |
|
HeadBanger Headphone Amp | Amplifiers | Jan 26, 2001 | | -3 |
|
Pad launch controller for model rockets | Models | Jun 17, 2003 | | 0 |
|
Stage center reverb unit circuit schematic | Music | Apr 14, 2010 | | 1 |
|
Custom USB tyre pressure monitoring system | Automotive | | | -1 |
|
Simple flashing light circuit | Models | Jan 26, 2001 | | 0 |
|
Simple flashing light circuit | Models | Jan 26, 2001 | | 0 |
|
A dual alternating flashing light circuit | Models | Jan 26, 2001 | | -1 |
|
Simple flashing light circuit | Models | Jan 26, 2001 | | 0 |
|
A dual tandem flashing light circuit powered by a 9 volt battery | Models | Jan 26, 2001 | | 0 |
|
Simulate the Gyralite (dual flashing headlights). | Models | Jan 26, 2001 | | 0 |
|
Moderately complex train detector using an infrared LED and an infrared detector | Models | | | 0 |
|
Simple train detector using ambient light and a photocell | Models | Jan 26, 2001 | | 0 |
|
Aladin interface | PDA | Jun 13, 2002 | | 0 |
|
Homemade GPS jammer using a MC145151 frequency synthesizer | Misc | Jan 17, 2011 | | -4 |
|
Neon lamp dimmer | Lighting | Nov 17, 2002 | | -1 |
|
Microphone phantom power supply | Audio | Jan 31, 2003 | | 0 |
|
AD9850 DDS daughterboard | Test | Sep 21, 2006 | | 0 |
|
30M PSK31 Transceiver circuit diagram | RF | Feb 25, 2003 | | 1 |
|
SOP receiver (PDF) | RF | Oct 30, 2002 | | 2 |
|
SOP direct conversion receiver | RF | Jan 06, 2002 | | -1 |
|
Popular Electronics Ultrasound Detector | Misc | Jan 01, 2003 | | 0 |
|
PIC micro to ISA bus interface | Microcontroller | Apr 17, 2004 | | -1 |
|
Balanced microphone preamp | Preamp | Nov 01, 2002 | | 2 |
|
Machine Independent Parallel Interface | PC | | | -1 |
|
Navigator 555A radio direction finder (RDF) circuit diagram | Misc | May 01, 2004 | | 0 |
|
Signal Tracer and Injector | Test | Sep 13, 2006 | | -2 |
|
80188XL Engine Tachometer / Race Computer | Automotive | Oct 24, 2002 | | -1 |
|
TDS/PPM Meter for measuring of the amount of salts in a solution | Test | Mar 29, 2009 | | 0 |
|
Laser Modem with an Arduino Microcontroller | Arduino | Nov 13, 2010 | | -2 |
|
24" Wall Clock | Timing | | | 0 |
|
Linuxstamp general purpose processor module based on Atmel AT91RM9200 | Microcontroller | | | -1 |
|
PG31 GPS RS232 GPS development board | PC | | | -1 |
|
PG31 GPS RS232 USB development board | PC | | | -1 |
|
PointLess LED Array - A 8 by 8 array displays something using POV | LED | | | 0 |
|
A "persistence of vision display" (POV display) using LEDs | LED | | | 1 |
|
PC to microcontroller communications using power from the PC serial port | Microcontroller | | | -1 |
|
RS232 RS485 USB Converter Board | PC | | | -1 |
|
PalmPilot turbo boost guage interface | PDA | Apr 27, 2003 | | 0 |
|
1.5V iPod Microphone (PDF) | PDA | Sep 25, 2009 | | 1 |
|
Inverter for fluorescent lights as published in Silicon Chip Magazine February 1991 (PDF) | Lighting | Aug 18, 2009 | | 0 |
|
Solar switching regulator as published in Silicon Chip Magazine January 1994 Part 1/2 (PDF) | Solar | Aug 18, 2009 | | -2 |
|
Solar switching regulator as published in Silicon Chip Magazine January 1994 Part 2/2 (PDF) | Solar | Aug 18, 2009 | | -1 |
|
LDR light/dark activated relay switch | Control | Jun 17, 2003 | | -1 |
|
Dual Voltage Controlled Oscillator w/Modulator | Audio | Jun 08, 2002 | | 0 |
|
Spring reverb | Music | Jun 08, 2002 | | 0 |
|
MS Stereo Decoder | Audio | Jun 08, 2002 | | -1 |
|
Drum percussion sensor schematics | Music | Mar 05, 2009 | | -1 |
|
2 Note Ribbon Controller | Music | Mar 05, 2009 | | 0 |
|
4 Bit Digitizer / flash ADC using discrete components | Data Acquisition | Mar 05, 2009 | | 0 |
|
Using the Hot Springs Reverb reverberation unit | Music | Mar 05, 2009 | | 0 |
|
midi2cv8 to Drum Tone Board Connections | Music | Mar 05, 2009 | | -1 |
|
Practical MS Decoder Circuit | Music | Mar 05, 2009 | | 1 |
|
Drum Tone Oscillators | Music | Mar 05, 2009 | | -2 |
|
Theremax Theramic Circuit Schematic | Music | Mar 05, 2009 | | 0 |
|
Touch switches | Misc | Mar 05, 2009 | | -1 |
|
Vocal zapper | Music | Jun 08, 2002 | | -2 |
|
Headphone monitor amp | Amplifiers | Jun 08, 2002 | | -3 |
|
RIAA Equalized Stereo Phono Preamp | Preamp | Jun 08, 2002 | | -1 |
|
Theremin controller | Music | Jun 08, 2002 | | 2 |
|
Touch Switches | Control | Jan 26, 2001 | | -1 |
|
6090 digital decoder schematics | Control | Oct 30, 2002 | | -2 |
|
White LED circuits | LED | Oct 13, 2002 | | 0 |
|
Electroluminescent Receiver Kit includes circuit diagram | RF | | | 1 |
|
Receiver based on NE602 | RF | Jan 26, 2001 | | 0 |
|
Build your own UFO Bino-Scope unit - upgrade binoculars to become a photosensitive bino-scope | Misc | | | 0 |
|
Controlling your SLR Camera from an Ipod | Photo | May 09, 2010 | | 0 |
|
Deriving power from Lego NXT motor port A | Models | | | 0 |
|
External power supply for Lego NXT | Models | | | 0 |
|
Color sensor circuit | Misc | | | 0 |
|
Wire guidance sensor | Models | | | 1 |
|
GP2D12 distance sensor | Models | | | 0 |
|
Infrared lamp | IR | | | 0 |
|
Laser Target Finder Sensor | Laser | Oct 06, 2006 | | 0 |
|
Lego compatible, compact rotation sensor | Models | | | 0 |
|
DC40 - 40M Direct Conversion receiver | RF | Oct 08, 2009 | | -1 |
|
SSB linear amplifier made from a bunch of 2N2218 transistors | RF_Amplifier | Oct 08, 2009 | | 0 |
|
Homebrew signal generator tunable from 3 to 30 Mhz | Test | Oct 08, 2009 | | 0 |
|
Simple Dual Band SSB Transceiver (20/40 meters) | RF | Oct 08, 2009 | | -1 |
|
PASCO scientific model SF-9211 stroboscope schematic (PDF) | Misc | | | 0 |
|
Microchip PIC ICD (in-circuit debugger) | Microcontroller | Jun 18, 2003 | | -2 |
|
Variety of circuits for RS232 to TTL Signal Conversion | Microcontroller | | | -1 |
|
Variety of circuits for TTL to RS232 Signal Conversion | Microcontroller | | | -1 |
|
Smooth, fast, strong and cheap stepper motor controller using a PIC micro | Control | Nov 04, 2011 | | -1 |
|
Tony Nixons Pocket Programmer (PIC) | Programmers | Oct 13, 2002 | | 0 |
|
Simple switching power supply | Power | Jul 10, 2002 | | -1 |
|
Selection of PWM driver circuits for electric DC motors | Control | Nov 05, 2009 | | -1 |
|
PicoWeb V5.1 (AT90S8515) tiny web server | Microcontroller | Jan 31, 2003 | | -1 |
|
RDS Encoder | Audio | Mar 27, 2009 | | -1 |
|
Mass storage and printer interface for the FX-700P calculator | PDA | | | 0 |
|
MP3 Player circuit schematic | Music | May 30, 2007 | | 1 |
|
Atmel 89C2051 In-Circuit Programmer Schematic | Programmers | Jun 20, 2004 | | 0 |
|
8051 Development System Circuit Board | Microcontroller | Sep 13, 2006 | | -1 |
|
8051 Development System Circuit Board | Microcontroller | Oct 23, 2002 | | -1 |
|
8051 Development System Circuit Board | Microcontroller | Aug 14, 2002 | | -2 |
|
50W audio power amplifier circuit diagram | Amplifiers | Jun 20, 2004 | | -4 |
|
CCD linear image sensor to PC parallel interface | PC | Jun 20, 2004 | | -1 |
|
MIDI drum machine project | Music | Jun 20, 2004 | | 0 |
|
MIDI Drum Machine Analog Input Schematic | Music | Apr 27, 2003 | | -1 |
|
Microprocessor using Xilinx FPGA | Microcontroller | Jun 20, 2004 | | -1 |
|
Arduindo based Appliance Remote Control | Control | Jun 20, 2010 | | -1 |
|
Online thermometer based on an Arduino | Arduino | Jun 20, 2010 | | -2 |
|
PS/2 Keyboard Or Mouse based on an Arduino | Arduino | Jun 20, 2010 | | -1 |
|
RFID Access Control System based on an Arduino | Arduino | Jun 20, 2010 | | 0 |
|
Oscilloscope / Logic Analyzer based on an Arduino | Arduino | Jun 20, 2010 | | -2 |
|
Arduino Based Security / Automation Sensors | Arduino | Jun 20, 2010 | | 1 |
|
Arduino speech sythesizer | Arduino | Jun 20, 2010 | | -2 |
|
Arduino based Time-Lapse Camera Controller | Arduino | Jun 20, 2010 | | -1 |
|
Interfacing an LCD touch control panel to an Arduino | Arduino | Jun 20, 2010 | | 0 |
|
Vehicle Telemetry Platform based on an Arduino | Arduino | Jun 20, 2010 | | -1 |
|
Virtual USB Keyboard based on an Arduino | Arduino | Jun 20, 2010 | | -1 |
|
Arduino based water flow guage | Arduino | Jun 20, 2010 | | -3 |
|
Water Tank Depth Sensor based on an Arduino | Arduino | Jun 20, 2010 | | -2 |
|
Weather Station Receiver based on an Arduino and 433MHz RF receiver module | Arduino | Jun 20, 2010 | | -1 |
|
Temperature controlled based on AT89CX051 | Microcontroller | Jan 26, 2001 | | -2 |
|
Sallen-Key Active Butterworth High Pass Filter Calculator and circuit diagram | Filter | Jan 16, 2010 | | 0 |
|
Sallen-Key Active Butterworth Low Pass Filter Calculator and circuit diagram | Filter | Jan 16, 2010 | | 0 |
|
MIDI Pedalboard encoder circuit diagram and background information | Music | | | 0 |
|
Tone Filters for Electronic Organs (PDF) | Music | | | -1 |
|
40m band direct conversion receiver | RF | Jan 06, 2002 | | 0 |
|
80m band direct conversion receiver | RF | Jan 06, 2002 | | -2 |
|
AC Power Meter | Power | | | -2 |
|
Remote Motor Controller | Control | | | -1 |
|
Precision Frequency Marker | Test | | | 1 |
|
Simple Inductance Meter | Test | | | 0 |
|
Regenerative Short Wave Radio | RF | | | 0 |
|
Sleep Timer | Timing | | | 0 |
|
Super VXO | Timing | | | 0 |
|
Homebrew 20m CW Transceiver | RF | | | -1 |
|
Homebrew 30m CW Transceiver | RF | | | 1 |
|
Homebrew 40m CW Transceiver | RF | | | 1 |
|
Homebrew 6m SSB/CW Transceiver | RF | | | 0 |
|
Homebrew 6m DSB Transceiver | RF | | | -1 |
|
TV RGB signal output from a SVGA graphics card | Video | Apr 14, 2003 | | 1 |
|
High Precision GPS/TV controlled Reference Oscillator | Timing | May 01, 2004 | | 0 |
|
u-Blox GPS receiver board | Misc | Mar 23, 2003 | | 0 |
|
I2C LCD interface | Microcontroller | May 01, 2004 | | -1 |
|
TV based Receiver for a Standard Frequency Generator | Timing | May 01, 2004 | | 0 |
|
FPGA Based ADS-B Receiver and Decoder | RF | Dec 09, 2010 | | 0 |
|
ADMS programming Cable for the Yaesu FT50, VX1 and VX5 | PC | May 07, 2010 | | 0 |
|
Radio Interface Box for the Motorola Radius GP300 | PC | May 07, 2010 | | -1 |
|
PG4S programming Cable for the Kenwood TM-V7 and TM-G707 | PC | May 07, 2010 | | 0 |
|
Laptop Computer Serial Port Power Booster | PC | Apr 12, 2001 | | -1 |
|
SPDIF RCA to (Optical + RCA) Adapter | PC | May 07, 2010 | | -1 |
|
136 kHz direct conversion receiver | RF | Jan 06, 2002 | | 0 |
|
Chebyshev / Butterworth filters | Filter | Jun 13, 2002 | | 0 |
|
AFSK 1200 Modem based on PIC16C620 | Microcontroller | Jul 10, 2002 | | 0 |
|
PicCon - Hidden Radio Transmitter Controller | Microcontroller | Jul 10, 2002 | | 0 |
|
Audible S-Meter | RF | | | 0 |
|
40 Segment LED S-Meter circuit diagram | RF | | | 0 |
|
Bi-Directional 2.4 GHz One Watt Amplifier | RF_Amplifier | Jun 13, 2002 | | -1 |
|
Bi-Directional 900Mhz One Watt Amplifier | RF_Amplifier | Jun 13, 2002 | | 0 |
|
20 Watt GaAaFET Power on 2.3 GHz | RF | Jun 13, 2002 | | 0 |
|
1 Watt 2.3 GHz RF Amplifier Using a MRF2001 | RF_Amplifier | Jun 13, 2002 | | 0 |
|
One Watt 2.45 GHz Linear Amplifier using RF Micro Devices RF2126 | RF_Amplifier | Oct 31, 2002 | | -1 |
|
VCR Tuner Based RF Spectrum Analyzer Schematic | Test | Sep 21, 2006 | | 0 |
|
2.3 GHz Power Amplifiers | RF_Amplifier | Jun 13, 2002 | | 0 |
|
2304 and 3456 MHz Power Amplifiers | RF_Amplifier | Jun 13, 2002 | | 0 |
|
LCD frequency counter (PIC16F84) | Test | Nov 29, 2002 | | 1 |
|
AD9852 DDS schematic | Timing | Feb 14, 2003 | | 0 |
|
High Frequency VCO Design and Schematics | RF | Oct 25, 2014 | | 1 |
|
Dopler RDF (radio direction finder) circuit | RF | | | 0 |
|
Biquad Active Bandpass Filter Schematic | Filter | Nov 01, 2002 | | -1 |
|
VFO from 2001 ARRL Handbook, page 17.74 | RF | Nov 01, 2002 | | 1 |
|
VFO from 2001 ARRL Handbook, page 14.20 | RF | Nov 01, 2002 | | 0 |
|
Various sound card interfacing circuit diagrams | PC | | | -1 |
|
Assorted relay control circuits | Control | Mar 18, 2003 | | -2 |
|
Assorted computer interface circuits | PC | Mar 18, 2003 | | -2 |
|
Assorted digital circuits | Misc | Mar 18, 2003 | | 0 |
|
Basic opamp circuits | Misc | Mar 18, 2003 | | 0 |
|
Assorted LED circuits | LED | Mar 18, 2003 | | 0 |
|
Miscellaneous simple circuits | Misc | Mar 18, 2003 | | 0 |
|
Assorted power source and control circuits | Power | Mar 18, 2003 | | -1 |
|
Assorted RF circuits | RF | Mar 18, 2003 | | 0 |
|
Assorted telephone circuits (ring generator, in-use indicator, audio interface) | Telephone | Mar 18, 2003 | | -1 |
|
PIC16F84 tone generator with source code | Microcontroller | Mar 01, 2003 | | 0 |
|
PIC16F84 tone generator | Microcontroller | Jul 10, 2002 | | 0 |
|
PIC16F84 tone generator (6-Bit) | Microcontroller | Jul 10, 2002 | | 0 |
|
14MHz SSB 10mW Transceiver | RF | Feb 24, 2003 | | 0 |
|
Decimal DDS Signal Generator | Timing | | | 0 |
|
Apple II/II+/IIe IDE Drive Interface | PC | Oct 31, 2002 | | -1 |
|
Circuits to transmit and demoludate RF / video signals over fibre optic cable | Video | | | 0 |
|
Space invaders game using PIC microcontroller | Games | Oct 06, 2006 | | 0 |
|
High quality exponential VCA | Amplifiers | Apr 17, 2004 | | -4 |
|
VLF radio receiver schematic | RF | Apr 17, 2004 | | 4 |
|
VLF Upconverter for Shortwave Receiver | RF | Sep 13, 2006 | | 0 |
|
Accelerometer Schematic | Data Acquisition | Oct 31, 2002 | | 0 |
|
Basic Vox Circuit | RF | | | 0 |
|
Build A 100Khz Crystal Calibrator | Timing | | | 0 |
|
Build A Simple Rechargeable CMOS Battery | Power | | | -1 |
|
Variable Bandwidth CW Filter | RF | | | 0 |
|
Simple electronic keyer | Misc | | | -1 |
|
An Inexpensive Tone Encoder | RF | | | 0 |
|
Build A High Performance Voltage Regulator From Discrete Components | Power | | | -1 |
|
Thermal cooling fan controller | Control | | | -1 |
|
FM Morse Code Keyer | Misc | | | 0 |
|
12 Volt Gel Cell Charger circuit diagram | Power | | | -1 |
|
Selection of Integrated Circuit Audio Amplifiers | Amplifiers | | | -4 |
|
Improved PL tone decoder | Audio | Jan 26, 2001 | | 0 |
|
Easy Morse Code Keyer Circuit | Misc | | | -1 |
|
Build A 10 Amp 13.8 Volt Power Supply | Power | | | 4 |
|
Adjustable Voltage Regulator using a 7805 or other fixed linear voltage regulator instead on LM317 | Power | | | -1 |
|
5 watt, 80 meter QRP CW Transceiver | RF | Jun 08, 2002 | | 0 |
|
Simple electronic S meter | Test | | | 0 |
|
Audio Speech Processor | Audio | | | -1 |
|
CW Tone Keyer | Misc | | | 0 |
|
Potpourri of Transistor Audio Amplifier Circuits | Amplifiers | | | -1 |
|
40 Meter, 5 Watt QRP Transmitter circuit diagram | Transmitters | | | -1 |
|
Using Pass Transistors Beef Up Voltage Regulator current output | Power | | | -2 |
|
R/C digital camera controller | Models | Mar 01, 2003 | | 1 |
|
Digital Call Sign Annunciator | Misc | Jun 09, 2002 | | 0 |
|
R/C helicopter camera | Models | Oct 30, 2002 | | 0 |
|
Monitor output from Motorola Oncore GPS engine in HP Z3801A in GPS Disciplined Oscillator | Misc | May 01, 2004 | | 0 |
|
16 Watt audio amplifier using pair of 8 watt LM383 audio amplifier chips | Amplifiers | Jan 26, 2001 | | -4 |
|
8 watt amplifier circuit diagram | Amplifiers | Jan 26, 2001 | | -5 |
|
Magnetic cartridge amplifier | Amplifiers | Jan 26, 2001 | | -1 |
|
Electret mic amplifier | Preamp | Jan 26, 2001 | | 2 |
|
Audio preamplifier | Preamp | Jan 26, 2001 | | -12 |
|
LM358 preamp circuit diagram | Preamp | Jan 26, 2001 | | -1 |
|
Sound detector circuit diagram | Audio | Jan 26, 2001 | | -2 |
|
Tone detector circuit diagram | Audio | Jan 26, 2001 | | -1 |
|
Tone generator circuit diagram | Audio | Jan 26, 2001 | | -1 |
|
Warbler siren circuit diagram | Audio | Jan 26, 2001 | | -1 |
|
40khz IR Tester circuit diagram | IR | Jan 26, 2001 | | 0 |
|
555 timer 40khz IR Oscillator | IR | Jan 26, 2001 | | 0 |
|
Basic IR detector / emitter circuit diagram | IR | Jan 26, 2001 | | 1 |
|
Ultrasonic switch transmitter and receiver circuit diagram | Misc | Jan 26, 2001 | | 0 |
|
12 volt battery monitor circuit diagram | Power | Jan 26, 2001 | | -1 |
|
12 volt power supply circuit diagram | Power | Jan 26, 2001 | | -1 |
|
5 volt power supply circuit diagram | Power | Jan 26, 2001 | | 1 |
|
Battery voltage monitor circuit diagram | Power | Jan 26, 2001 | | 0 |
|
LM3914 battery monitor circuit diagram | Power | Jan 26, 2001 | | -2 |
|
Multiple voltage power supply | Power | Jan 26, 2001 | | -3 |
|
Voltage doubler using a 555 timer | Power | Jan 26, 2001 | | 0 |
|
Voltage inverter using a 555 timer | Power | Jan 26, 2001 | | -2 |
|
Miniature FM transmitter circuit diagram | Transmitters | Jan 26, 2001 | | 0 |
|
Sensitive FM transmitter circuit diagram | Transmitters | Jan 26, 2001 | | 0 |
|
Simple RF transmitter circuit diagram | Transmitters | Jan 26, 2001 | | 0 |
|
1.5 volt tracking transmitter circuit diagram | Transmitters | Jan 26, 2001 | | 0 |
|
Tracking transmitter circuit diagram | Transmitters | Jan 26, 2001 | | 2 |
|
Speech Amplifier Box | Amplifiers | | | -4 |
|
Mini-MosFet Audio Amplifier | Amplifiers | Mar 05, 2009 | | -6 |
|
Compact DJ station | Music | Mar 05, 2009 | | 0 |
|
Plant Watering Watcher (moisture meter) | Misc | | | 0 |
|
Automated crib light circuit diagram | Lighting | | | 1 |
|
Sound pressure level meter circuit diagram | Audio | | | -1 |
|
Sensor Electronic Tracker with H-Bridge Drive | Solar | Jun 07, 2002 | | 0 |
|
Sensor Electronic Tracker with Simple Solar Charge Controller | Solar | Jun 07, 2002 | | 0 |
|
Solar tracking control system | Solar | Nov 16, 2002 | | -3 |
|
LED7 solar tracker circuit diagram | Solar | Nov 16, 2002 | | 1 |
|
Macrovision removal - includes circuit diagram and background information | Video | Jan 01, 2003 | | -2 |
|
Pressure Sensor-Based Altimeter Circuit | Data Acquisition | Apr 27, 2003 | | 1 |
|
Build a good GaAs FET preamp for 2 meters, 222MHz or 440MHz | RF_Amplifier | | | -1 |
|
An Audio Limiter for NBFM use | Audio | | | -1 |
|
Crystal heater / temperature stablization circuit (TXCO) | Timing | | | -1 |
|
An Audio-Noise-Based Voting Circuit | Audio | | | -1 |
|
Low power audio amplifier circuit based on LM386 | Amplifiers | Jan 29, 2010 | | -3 |
|
LED dimmer circuit | LED | | | -1 |
|
Build a DIY solar iPod charger | Solar | May 30, 2007 | | -2 |
|
Virtual Game System - A game console with a mechanically scanned display | Games | | | 1 |
|
AVR Color Clock using RGB LEDs | LED | | | 0 |
|
PIC10F200-based electronic dice | Games | | | 0 |
|
PIC16F84-based video game system | Games | | | 0 |
|
Generate video signals in software using PIC | Video | | | 0 |
|
SX28-based color video game system | Games | | | 0 |
|
Generate composite color video signals in software using an SX microcontroller | Video | | | 0 |
|
DIY Plasma Globe using an automotive ignition coil | Misc | | | 0 |
|
DIY Power Pulse Controller | Control | | | -1 |
|
DIY Tesla coil - DC Powered with Plasma Output | Misc | | | 0 |
|
Circuit diagram for connecting the SRF08/10/235 sonar modules to the BS2p Basic Stamp | Models | | | 0 |
|
Alphanumeric Led Display Project | LED | Nov 02, 2010 | | 0 |
|
H-Bridge Motor Driver Using Bipolar Transistors | Control | Aug 12, 2009 | | -3 |
|
Dual fan controller using ATTiny45 microcontroller | Control | Nov 02, 2010 | | -1 |
|
Standalone LED tester | Test | Nov 02, 2010 | | 0 |
|
DC Motor-Driver H-Bridge Circuit | Control | Jun 09, 2002 | | -1 |
|
Infrared Transmitter Project Implemented on a Solderless Breadboard | IR | Nov 02, 2010 | | 0 |
|
Model rocket launch controller | Models | Nov 02, 2010 | | 0 |
|
How to Make a PWM Circuit without a Microcontroller | Control | Aug 12, 2009 | | -1 |
|
How to Control LED Brightness with a PWM Circuit using a 74AC14 | LED | Apr 17, 2011 | | -1 |
|
Making an Amplified Color Sensor from an LED and an Op Amp | LED | | | 0 |
|
Schematic and breadboard layout for reversed LED color sensor using an opamp | LED | Aug 12, 2009 | | 1 |
|
Making a FRED photopopper | Models | | | 0 |
|
Simple switching regulator (experimental) | Power | Nov 16, 2002 | | -1 |
|
RS232 interfaced DVM using a PIC12F675 including source code for CCS C Compiler | Microcontroller | Sep 09, 2009 | | 0 |
|
A GPS receiver based frequency standard | Timing | Mar 23, 2003 | | 0 |
|
Build a breadboard power module for integrated circuits | Power | Sep 30, 2009 | | -1 |
|
Speaker cabinet simulator - professional-quality frequency response in a DIY-friendly circuit | Audio | Sep 30, 2009 | | -1 |
|
Two channel distortion circuit | Music | | | 2 |
|
Marshall 18W adapted for use as a distortion stompbox | Music | Sep 30, 2009 | | 0 |
|
Vox AC-30 Top Boost adapted for use as a distortion stompbox | Music | Sep 30, 2009 | | 0 |
|
Closer look at the FET booster based on a vintage Fender 12AX7 input stage. | Tube | | | -1 |
|
Ampeg SB-12 Portaflex adapted for use as a bass overdrive stompbox | Music | Sep 30, 2009 | | 0 |
|
Distortion effects using an LM386 audio amplifier IC | Music | Sep 30, 2009 | | 1 |
|
Two 9v battery-powered amps based on the LM386. Schematic and PCB/perfboard layouts. | Amplifiers | | | 0 |
|
Matchless DC/30 adapted for use as a distortion stompbox | Music | Sep 30, 2009 | | 0 |
|
Treble Booster/Overdrive including a perf board circuit layout | Music | Sep 30, 2009 | | 0 |
|
Schematic of a Rockman-like distortion. Schematic and PCB/perfboard layouts. | Music | | | 0 |
|
Mr. EQ - a simple, yet potent DIY equalizer | Music | Sep 30, 2009 | | 1 |
|
New clipper circuit diagram (based on TL071 opamp) | Music | Sep 30, 2009 | | 0 |
|
Versatile FET booster engine. Schematic and perfboard/PCB layouts. | Music | | | -1 |
|
Peppermill overdrive - A simple, transparent overdrive. Schematic and PCB/perfboard layouts. | Music | Sep 30, 2009 | | 0 |
|
Faux-phaser circuit with LFO and manual (wah pedal) modes. Schematic and and PCB layout. | Music | Sep 30, 2009 | | 0 |
|
Fender Princeton adapted for use as a distortion stompbox | Music | | | 0 |
|
Ruby is an "enhanced" version of the Little Gem battery-powered amplifier (LM386 based design) | Amplifiers | Sep 30, 2009 | | -1 |
|
Supro 16T adapted for use as a distortion stompbox | Music | Sep 30, 2009 | | 0 |
|
Dual parallel buffered effect loops with blend control. Schematic and perfboard/PCB layouts | Music | | | 1 |
|
Marshall 100W Super Lead adapted for use as a distortion stompbox. Schematic and PCB layout. | Music | Sep 30, 2009 | | 1 |
|
An ultra-flexible tonestack with clean boost. Schematic, photo, and PCB/perfboard layouts. | Music | Sep 30, 2009 | | 0 |
|
Tube Screamer-based overdrive. Schematic and PCB/perfboard layouts. | Tube | | | 1 |
|
Umble - A distortion stompbox, inspired by Dumble amplifiers. Schematic and PCB/perfboard layouts. | Music | Sep 30, 2009 | | -1 |
|
Boogie MkI adapted for use as a distortion stompbox | Music | | | -1 |
|
Two Transistor Reflex Radio | RF | Aug 17, 2009 | | 1 |
|
LED flasher using 4584 hex inverting Schmitt trigger | LED | Aug 17, 2009 | | 1 |
|
Sound operated switch | Audio | Aug 17, 2009 | | -1 |
|
Low power audio amplifier using BC109C along with BD679 and BD680 Darlington pairs | Amplifiers | | | -3 |
|
Long duration timer using 4060 12-stage binary ripple counter | Timing | Aug 17, 2009 | | 0 |
|
Infrared headphone system (includes transmistter and receiver schematics along with vero layout) | IR | Aug 17, 2009 | | 1 |
|
Simple stepper motor driver for PC parallel port | PC | | | -1 |
|
Optically isolated TRIAC driver | Control | Aug 17, 2009 | | -1 |
|
Reaction timer using 4013 flip-flop and 4060 12-stage binary ripple counter | Games | Aug 17, 2009 | | 0 |
|
10 watt audio power amplifier using discrete transistors (includes PCB layout) | Amplifiers | | | -1 |
|
TRIAC based lamp dimmer circuit diagram | Lighting | Aug 17, 2009 | | 2 |
|
Stroboscope | Misc | Aug 17, 2009 | | 0 |
|
8049 Spy - read the internal ROM contents of a 8048 or 8049 processor | Microcontroller | Sep 25, 2009 | | 0 |
|
MS-DOS EEPROM Programmer | PC | Sep 25, 2009 | | -1 |
|
Fluke 8010 / 8012 Interface | Test | Sep 25, 2009 | | 0 |
|
6802 Nano computer | Microcontroller | Sep 25, 2009 | | 0 |
|
Nikon IR-Remote Control based on Atmel ATtiny13 | Photo | Sep 25, 2009 | | 0 |
|
SAA1064 display module project | LED | Sep 25, 2009 | | 0 |
|
SB-Bus Drivers Introduction and Circuit Diagrams | PC | Sep 25, 2009 | | -1 |
|
AVR STK200/STK300 ISP Dongle circuit diagram | Microcontroller | Sep 25, 2009 | | 0 |
|
Tiny Eprom Simulator | Microcontroller | Sep 25, 2009 | | 0 |
|
UTP Cable Tester | Test | Sep 25, 2009 | | -2 |
|
PC based biofeedback monitor | Medical | | | 3 |
|
Camera remote control system using Basic Stamp | Photo | May 01, 2004 | | 0 |
|
Audio Detector Circuit | Audio | Oct 06, 2006 | | 0 |
|
RF Modem Robotics Project | Models | Jan 06, 2002 | | -1 |
|
Real-time Laser Range Finding Vision System | Laser | Oct 06, 2006 | | 0 |
|
10Hz - 100KHz D.D.S. Function Generator | Test | Sep 21, 2006 | | 0 |
|
RS-232 to TTL cable | PC | May 01, 2004 | | -1 |
|
Very basic circuits | Misc | Jan 26, 2001 | | -1 |
|
Implementing Infrared Object Detection | IR | Jan 26, 2001 | | 0 |
|
R2T2 Haywire Home Station | RF | Oct 07, 2009 | | 0 |
|
ICOM CI-V interface with RS232 RTS to PTT | RF | May 01, 2004 | | 1 |
|
Bat detector | Misc | Jan 26, 2001 | | 0 |
|
30-Meter QRP Transmitter for Morse Code | Transmitters | Jan 26, 2001 | | 0 |
|
3rd brake light circuit diagram | Automotive | Jan 26, 2001 | | -1 |
|
DC to AC inverter using a 555 timer | Power | | | 1 |
|
555 Timer IC Tester circuit diagram | Test | Jan 26, 2001 | | 1 |
|
555 go / no-go tester circuit diagram | Test | Jan 08, 2002 | | -1 |
|
Dual (postive and negative) 12V power supply | Power | | | 2 |
|
Active Antenna AA-7 HF/VHF/UHF, 3-3000MHz | RF | | | -2 |
|
Active antenna 1 to 20dB, 1-30 MHz range | RF | | | -1 |
|
Active Antenna for AM-FM-SW | RF | | | -1 |
|
FM radio active antenna | RF | | | -1 |
|
Light / dark activated relay | Control | Jan 26, 2001 | | -1 |
|
Touch activated alarm system | Alarms | Jan 26, 2001 | | -2 |
|
Current booster for 78nn series voltage regulators | Power | | | 0 |
|
Aviation band receiver | RF | | | -1 |
|
Car backup / reversing alarm | Automotive | | | 0 |
|
12V Lead-Acid Battery Monitor using LM3914 | Power | Jan 08, 2002 | | 0 |
|
Battery Tester for 1.5 and 9V | Test | | | 1 |
|
Charger for gel lead acid batteries | Power | Jan 26, 2001 | | 0 |
|
Broadcast-Band RF Amplifier | RF_Amplifier | | | -5 |
|
Bug detector with beep using 7413 or 74LS13 | RF | Jan 26, 2001 | | 0 |
|
Bug detector / countersurveillance monitor | RF | | | 0 |
|
Electronic canary doorbell | Misc | | | 0 |
|
12V to 9V car coverter circuit diagram | Automotive | Jan 26, 2001 | | -2 |
|
Clock generator | Timing | Jan 26, 2001 | | 0 |
|
Continuity tester V2 circuit diagram | Test | Jan 26, 2001 | | 0 |
|
Continuity tester circuit diagram | Test | Jan 26, 2001 | | 0 |
|
Coin tosser | Games | Oct 06, 2006 | | 0 |
|
Compressor-mate power protection for refrigerators, freezers and air conditioners | Power | Oct 06, 2006 | | 0 |
|
Cut phone line detector | Telephone | Jan 08, 2002 | | 0 |
|
DSL / ADSL phone line filter | Telephone | | | 0 |
|
Waterpump Safety Guard for fish pond / fish tank | Alarms | | | -1 |
|
Third brake light pulser circuit | Automotive | | | -1 |
|
Miniature FM Transmitter #1 | Transmitters | Jan 26, 2001 | | -1 |
|
Miniature FM Transmitter #2 | Transmitters | Jan 26, 2001 | | -1 |
|
Miniature FM Transmitter #3 | Transmitters | Jan 26, 2001 | | -1 |
|
4-transistor transmitter circuit diagram | Transmitters | Oct 06, 2006 | | 0 |
|
FM telephone transmitter | Transmitters | Oct 06, 2006 | | 0 |
|
Electronic dazer | Misc | | | -1 |
|
High voltage DC generator | Power | | | 0 |
|
High-Voltage Pulse Generator | Power | | | 1 |
|
Jacob's Ladder | Misc | | | -2 |
|
Lightning bulb - Create an electrical storm in a light bulb | Lighting | | | -1 |
|
Negative Ion Detector | Misc | | | -2 |
|
Negative Ion Generator | Misc | | | 0 |
|
Tesla coil | Misc | | | 0 |
|
Solid state tesla coil | Misc | | | 0 |
|
High voltage zappers | Misc | | | -4 |
|
Motorcycle battery charger | Automotive | | | -3 |
|
Lamp flasher/dimmer | Lighting | Jan 26, 2001 | | -1 |
|
Miniature tracking transmitter | Transmitters | Oct 06, 2006 | | 0 |
|
Motorcycle low battery voltage warning circuit | Automotive | | | -2 |
|
Morse Code Practice Keyer 1 | Misc | Jan 26, 2001 | | -1 |
|
Morse Code Practice Keyer 2 | Misc | Jan 26, 2001 | | -1 |
|
Motorcycle brake light flasher | Automotive | | | 0 |
|
Motorctcle turning signal system | Automotive | | | -2 |
|
Automatic 9V NiCad battery charger | Power | | | 0 |
|
9-pin null modem cable | PC | Jan 26, 2001 | | -2 |
|
Audio preamp | Preamp | Jan 26, 2001 | | 0 |
|
Logic probe | Test | Jan 26, 2001 | | -1 |
|
Pulse width modudulator using 555 timer IC | Control | Aug 03, 2009 | | -2 |
|
Active Power Zener | Power | | | -1 |
|
Sound activated relay, V1 | Audio | | | -1 |
|
Sound activated relay, V2 | Audio | | | -1 |
|
Basic RF oscillator | RF | Jan 26, 2001 | | -2 |
|
Light sensing RF transmitter | Transmitters | Jan 26, 2001 | | 0 |
|
ScanMate audio activated recorded | Microcontroller | Jan 26, 2001 | | 0 |
|
Subcarrier adapter to listen to hidden subcarrier signals on FM radio | RF | | | 1 |
|
Water-level sensor | Data Acquisition | Jan 26, 2001 | | 1 |
|
741 Light Sensor | Misc | Jan 26, 2001 | | -1 |
|
Fluid level detector | Misc | Jan 26, 2001 | | 2 |
|
Solid state relay circuit | Power | | | -1 |
|
Simplest R/C circuit | Models | | | -2 |
|
Theremin | Music | | | -1 |
|
Touch switch using transistors | Misc | | | -1 |
|
1.5V tracking transmitter circuit diagram | Transmitters | Oct 06, 2006 | | -1 |
|
Micro-Spy with FETs | Transmitters | Jan 26, 2001 | | 1 |
|
Micro-Spy with USW | Transmitters | Jan 26, 2001 | | 0 |
|
Micro-Spy with TTL | Transmitters | Jan 26, 2001 | | 0 |
|
Wailing alarm siren | Alarms | | | -1 |
|
Wireless microphone | Transmitters | Oct 06, 2006 | | 1 |
|
Christmas lights tester | Lighting | Oct 06, 2006 | | -1 |
|
555 Timer Tutorial + Circuits | Timing | Jan 26, 2001 | | 0 |
|
Car Nicad charger | Automotive | Jan 26, 2001 | | -1 |
|
NiCad Discharger for Tx & Rx Packs | Power | | | 1 |
|
Glowplug driver for radio control models | Models | | | 0 |
|
Lead acid battery charger with float | Power | | | 1 |
|
Simple constant current source | Power | | | 0 |
|
Solar cell Nicad charger using Maxim MAX639 | Solar | Jan 26, 2001 | | 2 |
|
Two tone train horn | Models | Jan 26, 2001 | | 0 |
|
Low cost Atmel in-system programmer | Programmers | Apr 17, 2004 | | 0 |
|
Ultra low-cost programmer for AT90S family | Programmers | Apr 17, 2004 | | 0 |
|
AVR (AT90S2313) composite PAL colour bar generator | Video | Apr 17, 2004 | | -1 |
|
Connecting AT90S2313 with LCD display 2x16 char and 4x4 keypad | Microcontroller | Apr 17, 2004 | | 0 |
|
Electronic safety lock based on ATtiny26 | Microcontroller | Apr 17, 2004 | | 0 |
|
Greek telecard reader | Telephone | Apr 17, 2004 | | 0 |
|
128x64 LCD Driver for AT90S2313 (ZIP file) | Microcontroller | Apr 17, 2004 | | 0 |
|
1-Wire Barometer project | Data Acquisition | | | 0 |
|
Simple pH Meter Circuit, A Low Cost Adapter for Your Digital Voltmeter | Test | Nov 02, 2010 | | 0 |
|
Connecting LED to PIC Micro I/O pins (PDF) | Microcontroller | Nov 17, 2002 | | -1 |
|
FCTS Project | Misc | Mar 25, 2001 | | 0 |
|
Heart rate sensor | Medical | Oct 06, 2006 | | -2 |
|
Motor walker circuit | Models | Nov 16, 2002 | | 0 |
|
Zener-based solar engine | Solar | Nov 16, 2002 | | 0 |
|
Morse Code Beacon Keyer | RF | Sep 21, 2006 | | -1 |
|
PC Automatic Power-on Circuit | PC | May 19, 2015 | | -1 |
|
Constant Temperature Circuit | Control | Sep 21, 2006 | | -1 |
|
Improved FM Stereo Modulator | RF | Jul 09, 2002 | | 0 |
|
Count Accumulator for Radiation Levels (CARL) | Misc | Sep 21, 2006 | | 0 |
|
Modifications for CDV700 Geiger Counter | Misc | Sep 21, 2006 | | 0 |
|
40-30 CW Transmitter (Tube based) | Tube | May 19, 2015 | | 0 |
|
The WB0RIO 6U8A Code Practice Oscillator | Tube | May 19, 2015 | | 0 |
|
The House Finch Direct Conversion Tube Receiver | Tube | May 19, 2015 | | -1 |
|
The Little Chickadee 6U8A QRP Transmitter | Tube | May 19, 2015 | | 0 |
|
Magic Eye Tube Wavemeter | Tube | May 19, 2015 | | -1 |
|
WB0RIO Piglet 6U8A Regenerative Receiver (Tube based) | Tube | May 19, 2015 | | 0 |
|
QRP Antenna Tuner | RF | Sep 21, 2006 | | 0 |
|
All-Ears QSK Timing Generator | Timing | May 19, 2015 | | -1 |
|
Smooth Tone Clickless CW Sidetone Generator | RF | Sep 21, 2006 | | 0 |
|
Power Supply for Vacuum Tube Experiments | Tube | May 19, 2015 | | 0 |
|
Regulated 12V Dual LED Lamp | LED | May 19, 2015 | | 1 |
|
Regulated Dual 3 Watt White LED Lamp | LED | May 18, 2015 | | 0 |
|
Regulated 24 Watt Broad Spectrum LED Lamp | LED | May 19, 2015 | | 0 |
|
Lightning activated camera shutter trigger | Photo | Aug 17, 2009 | | -1 |
|
TTL Pulse Reading Logic Probe | Test | Sep 21, 2006 | | 0 |
|
High Fidelity FM Stereo Modulator (Rev E2) | RF | May 19, 2015 | | 0 |
|
VXO FM Bug | Transmitters | May 19, 2015 | | 0 |
|
Big Ear Stereo Parabolic Microphone | Misc | Sep 21, 2006 | | 0 |
|
Ultra Low Power LCD Indicator | Misc | Sep 21, 2006 | | 0 |
|
13 Color LED Rainbow circuit schematic | LED | Sep 21, 2006 | | -1 |
|
Nine Volt Battery Eliminator | Power | Sep 07, 2009 | | 1 |
|
Arduino LFO Waveform Generator V2 | Arduino | May 19, 2015 | | -1 |
|
Vacuum Tube B+ Delay Circuit | Tube | May 19, 2015 | | 0 |
|
Hammonator Organ to Guitar Amp Conversion (tube amplifier) | Tube | Sep 07, 2009 | | -2 |
|
Lil' Tiger Hammond AO-43 Organ to Guitar Amp Conversion | Music | May 19, 2015 | | 0 |
|
Liquidator Tube Phaser/Chorus Effect | Tube | Sep 07, 2009 | | 1 |
|
Voltage Controlled Panner | Audio | Sep 21, 2006 | | -1 |
|
Guitar Reverb Effect Version 2 | Audio | Sep 21, 2006 | | -1 |
|
Stereo Audio Isolator | Audio | Sep 21, 2006 | | -1 |
|
Panner Waveform Generator | Audio | Sep 21, 2006 | | -1 |
|
Voltage controlled audio panner | Audio | Aug 01, 2010 | | -1 |
|
Isolated Telephone Interface (phone tap) for tape recorder, PC sound card etc | Telephone | Sep 21, 2006 | | -1 |
|
PWM DC Motor Speed Control | Power | Sep 21, 2006 | | 0 |
|
PWM Motor Speed Controller / DC Light Dimmer | Control | Sep 07, 2009 | | 2 |
|
PWM Motor/Light Controller circuit diagrams | Control | Sep 07, 2009 | | -1 |
|
Microprocessor RS-232 Reset | Microcontroller | Sep 21, 2006 | | 0 |
|
18 LED dimmable LED lamp circuit diagram | LED | Sep 07, 2009 | | 0 |
|
Regulated Dual White LED Lamp | LED | Sep 07, 2009 | | 0 |
|
Seven Component Regulated LED Lamp | LED | Sep 21, 2006 | | 0 |
|
Buck Mode Switching Regulator for Solar Applications | Solar | Sep 21, 2006 | | 0 |
|
12 Volt Battery Voltage Monitor (kit available) | Power | Jun 18, 2015 | | 1 |
|
Solar Panel Charge Controller / Low Voltage Disconnect Circuit | Solar | Jul 12, 2001 | | -1 |
|
Solar Panel Charge Controller / Low Voltage Disconnect Circuit (SPC1) | Solar | Sep 07, 2009 | | -1 |
|
12 Volt 10 Amp Dark Activated Switch (kit available) | Control | Jun 18, 2015 | | -1 |
|
DAS1 - 12 Volt 10 Amp Dark Activated Switch | Control | Sep 07, 2009 | | -1 |
|
High Efficiency 12V White LED Driver | LED | Sep 21, 2006 | | 0 |
|
12 Volt Differential Temperature Controller | Control | Sep 07, 2009 | | -1 |
|
Solar Panel Current Meter | Solar | Jul 12, 2001 | | 0 |
|
LED Mood Light | LED | Jul 12, 2001 | | 0 |
|
Battery Low Voltage Beeper | Power | Sep 21, 2006 | | 0 |
|
12 Volt 15 Amp Low Voltage Disconnect (kit available) | Power | Jun 18, 2015 | | -1 |
|
Remote Solar LED light | Solar | Sep 21, 2006 | | -1 |
|
PWM Motor Speed Controller / DC Light Dimmer | Control | Nov 17, 2002 | | -1 |
|
PWM Motor Speed Controller / DC Light Dimmer | Power | Jul 12, 2001 | | 0 |
|
PWM Motor/Light Controller | Power | Jul 12, 2001 | | -1 |
|
SCC2 10 Amp Solar Charge Controller | Solar | Oct 30, 2002 | | 1 |
|
SCC2 10 Amp Solar Charge Controller | Solar | Sep 07, 2009 | | 1 |
|
12 Volt 20 Amp Solar Charge Controller (kit available) | Solar | Jun 18, 2015 | | 0 |
|
12 Volt 20 Amp Solar Charge Controller | Solar | Sep 21, 2006 | | -1 |
|
Shunt-mode Solar/Wind Charge Controller | Solar | Sep 07, 2009 | | 1 |
|
Solar Powered Night Light | Solar | Sep 07, 2009 | | 0 |
|
Solar Charged LED Flashlight | Solar | Jul 12, 2001 | | 0 |
|
Self Powered Solar Box Furnace | Solar | Sep 21, 2006 | | -1 |
|
SPC2 6 Amp Solar Power Center | Solar | Sep 21, 2006 | | 1 |
|
9 Amp in / 10 Amp out Solar Power Center (kit available) | Solar | Jun 18, 2015 | | 1 |
|
SPC3 9 Amp in / 10 Amp out Solar Power Center | Solar | Sep 07, 2009 | | 1 |
|
Solar Powered Reading Lamp | Solar | Sep 21, 2006 | | -2 |
|
12 Volt Toilet Tank Refiller circuit diagram | Misc | Sep 21, 2006 | | 0 |
|
Low Power LED Voltmeter | Power | Jul 12, 2001 | | 1 |
|
WGR1 - 12 Volt Wind Generator Regulator | Power | May 19, 2015 | | 0 |
|
Expanded Scale Battery Volt Meter | Power | Sep 07, 2009 | | 0 |
|
Stereo Test Tone Generator | Test | Sep 21, 2006 | | 0 |
|
Octopus Curve Tracer | Test | May 19, 2015 | | -1 |
|
Temperature Controlled Nicad Charger | Power | Sep 21, 2006 | | -1 |
|
12V, 4-AA Cell Differential Temperature Charger | Power | Aug 17, 2009 | | 0 |
|
Motorized Video Camera Mount | Video | Sep 21, 2006 | | -2 |
|
Morse Code Beacon Keyer | Misc | Jan 26, 2001 | | 0 |
|
Constant Temperature Circuit | Control | Jan 26, 2001 | | -1 |
|
Lightning Activated Camera Shutter Trigger | Photo | Jan 26, 2001 | | 0 |
|
Pulse Reading Logic Probe | Test | Jan 26, 2001 | | 0 |
|
Micro Power FM Broadcasting Circuits | Transmitters | Jan 26, 2001 | | 0 |
|
Voltage Controlled Panner | Audio | Jan 26, 2001 | | 0 |
|
PWM DC Motor Speed Control | Control | Jan 26, 2001 | | -1 |
|
Guitar Reverb Pedal | Music | Jan 26, 2001 | | 0 |
|
AA battery solar charger | Solar | Jan 26, 2001 | | 0 |
|
Solar Panel Charge Controller / Low Voltage Disconnect Circuit | Solar | Jan 26, 2001 | | 0 |
|
Solar Panel Current Meter | Solar | Jan 26, 2001 | | 0 |
|
LED Mood Light | Lighting | Jan 26, 2001 | | 0 |
|
PWM Motor/Light Controller | Power | Jan 26, 2001 | | 0 |
|
PWM Motor/Light Controller variants | Power | Jan 26, 2001 | | -1 |
|
Low Power LED Voltmeter | Power | Jan 26, 2001 | | 0 |
|
Temperature Controlled NICD Charger | Power | Jan 26, 2001 | | 0 |
|
Circuit for interfacing a relay / solenoid to a PC based on a 2N7000 FET | PC | Sep 01, 2009 | | -1 |
|
Variety of receiver converter projects | RF | Apr 24, 2001 | | 0 |
|
One transistor FM receiver | RF | Apr 24, 2001 | | -1 |
|
42 Mc Band to 88 Mc Band (retrofit converter) Project | RF | Apr 24, 2001 | | -1 |
|
RF noise bridge for HF | RF | | | -1 |
|
LC meter with LCD display for readout | Test | | | 0 |
|
160m mini portable End Fed Half Wave Tuner - MkII | RF | | | 0 |
|
RF/SS Handie Hopper Transmitter Schematic | Transmitters | Oct 23, 2002 | | 0 |
|
AT90S8515 experimenter board | Microcontroller | Nov 27, 2002 | | 0 |
|
DIY shutterglasses controller | Games | Jan 26, 2001 | | 0 |
|
Stop Action 3D-Photography using an audio flash trigger | Photo | | | 0 |
|
Remote control uses an IR receiver chip to receive the IR signal from the remote | IR | | | 0 |
|
How to construct Garmin GPS receiver interface cables | PC | Mar 23, 2003 | | -1 |
|
Vacuum Tube Microphone Preamp | Tube | Nov 01, 2002 | | 0 |
|
FCD (Fuel Cut Defencer) | Automotive | Oct 30, 2002 | | 0 |
|
Jasmin floppy disk controller schematics | PC | Sep 13, 2006 | | -2 |
|
Weather station with pressure reading, relative humidity, indoor & remote temperature reading | Misc | | | 0 |
|
Battery Charger Ideas | Power | Aug 14, 2002 | | 0 |
|
Crystal radio circuits including diode performance comparison | RF | Mar 10, 2003 | | -1 |
|
Game Show Timers | Games | Oct 06, 2006 | | 0 |
|
Induction receiver for tracing wiring behind walls, hearing lightning and other electric discharges | Misc | | | 0 |
|
Refrigerator Door Alarm | Alarms | | | -1 |
|
Rain alarm / rain detector | Alarms | | | -1 |
|
Homebuilt video digitizer Mark I | Video | Feb 01, 2003 | | -1 |
|
Homebuilt video digitizer Mark II | Video | Feb 01, 2003 | | 2 |
|
Daisy MP3 player project | Music | | | 0 |
|
Simple open source MP3 player with SD/MMC memory card support | Music | May 30, 2007 | | 0 |
|
Archery timer | Games | Aug 14, 2002 | | 0 |
|
Windmill DIY Analog MPPT (maximum power point tracker) Circuit | Power | Mar 09, 2012 | | 0 |
|
CO2 controller for planted tanks | Control | Jan 26, 2001 | | 0 |
|
Ultrasonic Distance Measurement With the MSP430 (PDF) | Microcontroller | | | 2 |
|
Texas Instruments collection of differential op-amp circuits (PDF) | Misc | | | 1 |
|
Texas Instruments collection of buffer op-amp circuits for ADC | Misc | | | 1 |
|
Simple MPPT-Based (maximum power point tracker) Lead Acid Charger Using bq2031 (pdf) | Solar | Mar 09, 2012 | | -3 |
|
Wireless local network for PalmPilot (large PDF) | PDA | Nov 16, 2002 | | 0 |
|
FET Preamp Cable | Preamp | Nov 01, 2002 | | -3 |
|
Building a Hardware Random Bit Generator | Misc | | | 0 |
|
Monostable multivibrator | Timing | Jan 01, 2003 | | 0 |
|
Altec 1564A Preamp Power Supply | Preamp | Sep 13, 2006 | | 3 |
|
Neumann U67 microphone preamp power supply | Preamp | Sep 13, 2006 | | -2 |
|
Midibox 64 | Music | Aug 09, 2002 | | 0 |
|
TTL to RS232 adapter using 2N3906 / 2N3904 transistors | Microcontroller | | | 0 |
|
VK5JST Aerial analyser | RF | Jun 24, 2015 | | -1 |
|
An Ultra Low Distortion Audio Test Oscillator | Audio | Jun 24, 2015 | | -1 |
|
A dummy load and power meter for HF (PDF) | RF | Jun 24, 2015 | | 0 |
|
An ESR Meter For Electrolytic Capacitors (and Low Ohms Meter) | Test | Jun 24, 2015 | | -2 |
|
20 amp (peak) power supply for SSB transceivers | Power | Jun 24, 2015 | | 0 |
|
Build your own Q Meter project | Test | Jun 24, 2015 | | 1 |
|
A Simple RF Probe For Your DVM | Test | Jun 24, 2015 | | 1 |
|
An RF Voltmeter for Transceiver Servicing | Test | Jun 24, 2015 | | -1 |
|
Medium and Very High Quality Two Tone Generators for Transceiver Testing | Test | Jun 24, 2015 | | -1 |
|
Highly sensitive and selective Field Strength Meter system | Test | Apr 14, 2011 | | 0 |
|
Wide dynamic range Field Strength Meter mark I | Test | Apr 14, 2011 | | 0 |
|
Wide dynamic range Field Strength Meter mark II | Test | Apr 14, 2011 | | 0 |
|
RS232 - Lowe HF-225 interface | PC | Nov 21, 2002 | | -1 |
|
Addressable ADC | Data Acquisition | Jul 24, 2002 | | -1 |
|
Battery Characterizer | Power | Jul 24, 2002 | | 1 |
|
Delayed shutter control for Kodak DC-20 | Misc | Jul 24, 2002 | | 0 |
|
Combination Lock (PIC16F84) | Alarms | Jul 24, 2002 | | -2 |
|
PIC16F876 Datalogger | Microcontroller | Jul 24, 2002 | | 2 |
|
R/C Emergency locator alarm | Models | Jul 24, 2002 | | 0 |
|
Combination lock for car liftgate | Automotive | Jul 24, 2002 | | -1 |
|
Morse code display | Misc | Jul 24, 2002 | | -2 |
|
Kodak DC-20 camera interface (PIC12C509) | Photo | Jul 24, 2002 | | -1 |
|
Kodak DC-20 camera interface (PIC16F84) | Photo | Jul 24, 2002 | | 0 |
|
Angelfire rocket GPS payload | Models | Sep 10, 2006 | | 0 |
|
Relay circuit for relay control via an RS232 port | Control | | | -1 |
|
Serial to parallel converter - connect a large number of digital outputs to a PC parallel port | PC | | | -1 |
|
Micro-step driver - connect a bipolar steppe motor to a PC through the parallel port | Control | | | 0 |
|
PC parallel port eight DC power switch cam driver two unipolar stepper motors, lights etc | PC | | | -1 |
|
80 Metre CW beacon / transmitter circuit diagram | Transmitters | Sep 01, 2009 | | 0 |
|
ADXL202 break-out board | Data Acquisition | | | 0 |
|
Wisp628 ISP Microchip PIC Programmer | Programmers | Aug 09, 2002 | | 0 |
|
WLoader - PIC16F877 application loader / bootloader | Microcontroller | May 01, 2004 | | 0 |
|
Lead/acid battery charger | Power | | | 0 |
|
Simple RIT circuit based on a 2N7000 FET | RF | Sep 01, 2009 | | -1 |
|
Circuit for temperature stabilization of a MTP3055E MOSFET | Misc | Sep 01, 2009 | | 0 |
|
Digital signal processor (DSP) for radio communications | Filter | Jun 06, 2003 | | 0 |
|
Simple LED Constant Current Lighting Circuit | LED | Jul 11, 2012 | | -1 |
|
56K RF Modem circuit diagram | RF | Jan 06, 2002 | | -1 |
|
29.85 MHZ bandpass filter schematic | Filter | Nov 01, 2002 | | 1 |
|
29.85 MHZ notch filter schematic | Filter | Nov 01, 2002 | | 0 |
|
Altec 428B Microphone Preamplifier schematic | Preamp | Sep 13, 2006 | | 0 |
|
API 321 mic preamp schematic | Preamp | Sep 13, 2006 | | 2 |
|
RCA BA-1A two-stage preamp schematic | Preamp | Sep 13, 2006 | | 0 |
|
RCA BA-21A preamplifier schematic | Preamp | Sep 13, 2006 | | 0 |
|
RCA BA-31A preamplifier schematic | Preamp | Sep 13, 2006 | | 3 |
|
Poor man's analog to digital converter (ADC) using a 2N222 transistor and a few passives (PDF) | Microcontroller | | | -2 |
|
GPS-based universal clock generator | Timing | | | 0 |
|
Pic-Plot GPIB to RS-232 converter | PC | | | 1 |
|
Kenwood TH-D7 NMEA GPS bug fix | Misc | | | -1 |
|
5 tubes SSB QRP Transceiver for 20m Ham band | Tube | | | 1 |
|
Pic-Plot2 GPIB to USB converter | PC | | | 0 |
|
Nixie clock (PIC16F876) | Tube | Jun 18, 2003 | | 0 |
|
Homemade scope clock using a DG7 tube and a Microchip PIC16F876 | Tube | | | 0 |
|
ADC logger 6ch Measurent and serial port logger with wireless longrange link | Data Acquisition | | | 0 |
|
Atmel Mega32 8ch Analog signal measure logger | Data Acquisition | | | 0 |
|
Atmel Mega88 Dual Temperatur meter | Microcontroller | | | 0 |
|
Atmel Mega88 Temperatur meter, Type K sensor, Heat set and regulator | Microcontroller | | | -1 |
|
PA fan temperature controlled speed motor speed controller | Control | | | -2 |
|
PIC16 DemoKit3 with programmer and displays | Programmers | | | 0 |
|
144.000 Mhz CW Transmitter | Transmitters | | | -2 |
|
2m (144MHz) Dual Gate FET Low Noise Amplifier | RF_Amplifier | | | -1 |
|
Car Timer with Atmel ATiny45 to automatically turn of accessories to prevent flat battery | Automotive | | | -4 |
|
VCO covers 300MHz to 500MHz based on Maxim MAX2608 VCO | Timing | | | 0 |
|
Digital Wattmeter, measures from nanowatts to kilowatts using AD8307, PIC16F876, LCD Display | Test | | | 0 |
|
200 Watt Modified PC Power Supply 13.5 Volt 14 Amp | Power | Jul 24, 2002 | | -1 |
|
SWR Bridge 1 to 1000 Mhz (1GHz) | Test | | | -1 |
|
Homemade Water Drain Pump controller | Control | | | -1 |
|
Universal Exposure Timer and Event Counter | Photo | | | 1 |
|
Computer Sound Port Shutter Tester | Photo | Aug 17, 2009 | | 0 |
|
Field strength meter for the 137 kHz band | Test | May 01, 2004 | | 0 |
|
Five Tube Stereo Amplifier | Tube | Sep 13, 2006 | | -1 |
|
Dual stepper motor drivers using UDN2540 | Control | Jul 03, 2011 | | -1 |
|
PWM DC motor driver and control with SG3525 | Control | Jul 03, 2011 | | -2 |
|
Kenwood TR-7950 manual & schematics (PDF) | RF | Sep 10, 2006 | | 0 |
|
Battery Meter for Pinball Machines | Games | | | 0 |
|
Novel Buzzer | Alarms | Nov 27, 2002 | | -1 |
|
Modular Burglar Alarm | Alarms | Nov 27, 2002 | | -2 |
|
Motorcycle alarm | Alarms | Nov 17, 2002 | | 0 |
|
Enhanced 5 Digit Alarm Keypad | Alarms | Nov 27, 2002 | | -2 |
|
Enhanced 4 Digit Alarm Keypad | Alarms | Nov 27, 2002 | | -1 |
|
RF Alarm | Alarms | Nov 27, 2002 | | -1 |
|
Single Zone Alarm | Alarms | Nov 27, 2002 | | -1 |
|
Water Activated Alarm | Alarms | Nov 27, 2002 | | 1 |
|
Water level alarm | Alarms | Nov 17, 2002 | | -1 |
|
2W Audio Amplifier using BD139 and BD140 transistors | Amplifiers | Jan 26, 2001 | | 2 |
|
3-Band audio graphic equalizer | Audio | Jan 26, 2001 | | -2 |
|
6-Input mixer circuit diagram | Audio | Jan 26, 2001 | | -1 |
|
Doorphone intercom | Audio | Jan 26, 2001 | | 0 |
|
Hi Fi preamp | Preamp | Jan 26, 2001 | | -3 |
|
Stereo audio line driver for running audio over long distance cables | Audio | Jan 26, 2001 | | -1 |
|
Variable notch filter with both high and low pass filters | Filter | Sep 13, 2006 | | 0 |
|
Peak reading audio level meter using CA3140 opamp | Amplifiers | Jan 26, 2001 | | -3 |
|
Tone control circuit schematic | Audio | Jan 26, 2001 | | -2 |
|
TDA2030 8 Watt amplifier | Amplifiers | Jan 26, 2001 | | -8 |
|
Infra Red Switch | IR | Nov 27, 2002 | | 0 |
|
IR remote control extender | IR | Jan 26, 2001 | | 0 |
|
IR Remote Control Extender Circuit (Mark 2) | IR | Nov 27, 2002 | | 0 |
|
IR Remote Control Extender Circuit (Mark 3) | IR | Nov 27, 2002 | | 1 |
|
Infra Red wired Repeater circuit to control appliances from a remote location | IR | | | 0 |
|
IR Link | IR | Nov 27, 2002 | | 0 |
|
Multi Rocket Launcher | Models | Nov 27, 2002 | | 0 |
|
Model rocket launch controller | Models | Nov 27, 2002 | | -1 |
|
Doorbell for the deaf that provides a delayed visual indication when a doorbell switch is pressed | Misc | Nov 27, 2002 | | 0 |
|
Electromagnetic field detector | Misc | Jan 26, 2001 | | 1 |
|
Hot Water Tank Level Indicator | Control | Nov 27, 2002 | | -1 |
|
High Quality Intercom | Misc | Nov 27, 2002 | | -1 |
|
Basic infrared link for audio communication over distances up to 3 metres | IR | Feb 05, 2010 | | -1 |
|
Magnetic Gun. | Misc | Nov 27, 2002 | | 0 |
|
Single chip metal detecor with a range of a few inches based on CS209A | Metal | | | 2 |
|
Perimeter monitor | Alarms | Jan 26, 2001 | | -1 |
|
Quiz game circuit | Games | Nov 27, 2002 | | 0 |
|
Speaker Microphone Circuit | Audio | Nov 27, 2002 | | -1 |
|
Static Electricity / Negative Ion Detector | Misc | Nov 27, 2002 | | 0 |
|
Temperature monitor using 741 opamp | Control | Jan 26, 2001 | | -1 |
|
Ultrasonic dog whistle | Misc | Jan 26, 2001 | | 0 |
|
Electronic canary sound effects | Audio | Jan 26, 2001 | | -2 |
|
Electronic siren | Audio | Nov 27, 2002 | | 0 |
|
Sound Effects Generator | Music | Nov 27, 2002 | | 1 |
|
Sound Effects Generator 2 | Music | Nov 27, 2002 | | -3 |
|
12V 30A power supply circuit diagram | Power | Jan 26, 2001 | | -1 |
|
Dual regulated power supply | Power | Jan 26, 2001 | | -2 |
|
Fuse blown indicator | Power | Jan 26, 2001 | | 1 |
|
Gyrator circuit | Power | Jan 26, 2001 | | 0 |
|
LM317 Regulator Circuit | Power | Nov 27, 2002 | | -2 |
|
Nicad battery charger | Power | Jan 26, 2001 | | 0 |
|
Unregulated power supply | Power | Jan 26, 2001 | | 0 |
|
Camera switching circuit to run multiple cameras with one monitor | Video | | | 0 |
|
Cold activated switch (frost alarm) | Alarms | Jan 26, 2001 | | -1 |
|
Voltage comparator switch | Control | Jan 26, 2001 | | -1 |
|
Dark activated switch | Control | Jan 26, 2001 | | 0 |
|
Push Button Switch Debouncer | Timing | Jan 26, 2001 | | 0 |
|
Digital combination lock circuit diagram | Alarms | Jan 26, 2001 | | -1 |
|
Alarm control keypad | Alarms | Nov 27, 2002 | | -1 |
|
Light detector | Control | Jan 26, 2001 | | 1 |
|
Electronic night light | Lighting | Jan 26, 2001 | | -2 |
|
DC Motor Reversing Circuit | Control | Nov 27, 2002 | | 0 |
|
Sound operated switch | Control | Jan 26, 2001 | | 0 |
|
Multi wire cable tester that handles up to eight conductors | Test | Nov 27, 2002 | | 0 |
|
Connection tester for checking solder joints and other connections | Test | Nov 27, 2002 | | 0 |
|
EMF field probe (electromagnetic field probe) covering up to 100kHz | Test | Jan 26, 2001 | | 0 |
|
Function generator based on 8038PCD function generator IC | Test | Jan 26, 2001 | | 0 |
|
IR remote control tester | IR | Jan 26, 2001 | | 0 |
|
Zener diode tester based on a 555 timer | Test | Jan 26, 2001 | | 1 |
|
5 to 30 Minute Timer circuit diagram | Timing | Nov 27, 2002 | | 1 |
|
NE555 Basic Monostable | Timing | Nov 27, 2002 | | 0 |
|
Commodore 64 Video Modulator 251025 Schematics | Video | Nov 16, 2002 | | 0 |
|
Commodore 64 Video Modulator 251696 Schematics | Video | Nov 16, 2002 | | 6 |
|
Computerized Infrared Remote | IR | Aug 27, 2003 | | 0 |
|
Darkroom timer using PIC16F84A | Microcontroller | Mar 07, 2009 | | 0 |
|
Lego Mindstoms IR Link PIC transceiver | Games | Mar 07, 2009 | | -1 |
|
Lego Mindstorms Double Rotation Sensor | Games | Mar 07, 2009 | | 0 |
|
LC filter design on-line calculator | Filter | Jun 13, 2002 | | 0 |
|
Envelope generator ADSR | Audio | | | -2 |
|
Scaling ADXL50 accelerometer output | Misc | Jan 26, 2001 | | -1 |
|
Wireless Electrocardiogram Monitor | Medical | Oct 06, 2006 | | 0 |
|
Beat Tracking Strobe | Audio | | | 0 |
|
Sniper tag laser beam detector | Laser | Oct 06, 2006 | | 0 |
|
Galvanic Skin Response (GSR) Circuit | Medical | | | 1 |
|
Accurate Digital LC Meter based on a PIC16F84 | Test | Feb 20, 2013 | | 0 |
|
Simple high current pulsed laser driver using an avalanche transistor | Laser | | | 0 |
|
Common Ground for Older VPW OBD Circuit | Automotive | May 01, 2004 | | -1 |
|
USB to parallel port converter using Cypress CY7C68013A-56PVXC | PC | | | 0 |
|
Mini dice - PIC10F200-based electronic dice | Microcontroller | Jun 28, 2015 | | 2 |
|
5V solar power supply | Solar | Jun 28, 2015 | | 0 |
|
Tic tac toe game based on a PIC16F628 | Games | Jun 28, 2015 | | -2 |
|
2A power supply - An adjustable power supply for model railways and general projects | Power | Jun 28, 2015 | | -1 |
|
A handy 2-Input alarm using the PIC Lick-1 module | Alarms | Jun 28, 2015 | | -1 |
|
4 channel RF remote control | Control | Jun 28, 2015 | | 1 |
|
Infrasound circuits including several infrasound amplifier circuit diagrams | Misc | Jul 05, 2015 | | 0 |
|
Collection of eight audio amplifier circuit diagrams | Amplifiers | Jul 05, 2015 | | -5 |
|
Clock project based on National Semincondutor MM5402N | Timing | Jul 05, 2015 | | 0 |
|
Bug Duster - a detector for uncovering RF-based video and audio bugging devices | RF | Jul 10, 2015 | | -1 |
|
Ghost detector - detects if a ghost disturbs the electric field in the vicinity of the device | Misc | Jul 10, 2015 | | 0 |
|
Lightning detector to receive static pulses from lightning at a frequency near 200 kHz | Misc | Jul 10, 2015 | | 0 |
|
Low Frequency Block Converter - Converts VLF/LF bands to shortwave frequencies | RF | Jul 10, 2015 | | 0 |
|
Computer datalogger circuits | Data Acquisition | Jul 10, 2015 | | 0 |
|
Simple Computer A/D Uses a Serial Port | Data Acquisition | Jul 10, 2015 | | 0 |
|
24 Line Parallel Interface for the PC - old ISA based design (PDF) | PC | Jul 10, 2015 | | 0 |
|
Active antenna that will work from below a few kHz to over 100 MHz | RF | Jul 10, 2015 | | 0 |
|
Atmospheric receiver to detect crackling static in a radio produced by lightning | Misc | Jul 10, 2015 | | -1 |
|
CW transmitter for 80 m and 40 m amateur radio bands based on AD9833 DDS | Transmitters | Jul 13, 2015 | | 0 |
|
All-Digital Stereo FM Transmitter with RDS based on AD9852 DDS (PDF) | Transmitters | Jul 13, 2015 | | 1 |
|
FM transmitter based on MC145170 PLL and Mini-circuits POS150 | Transmitters | Jul 13, 2015 | | 0 |
|
SWR protection board for 20W Mosfet FM amplifier | RF_Amplifier | Jul 13, 2015 | | 2 |
|
25W FM MOSFET RF power amplifier based on BLF245 | RF_Amplifier | Jul 13, 2015 | | 4 |
|
100W FM RF power amplifier based on MRF317 | RF_Amplifier | Jul 13, 2015 | | -2 |
|
5W PLL FM Transmitter with typical output power of 5 W and no-tune design | Transmitters | Jul 13, 2015 | | 0 |
|
Programmable PLL (Si570) Local Oscillator for HF Receivers, Transmitters, Transceivers (PDF) | RF | Jul 13, 2015 | | -2 |
|
Mini AM transmitter using LM386 and 4 MPF102 FETs for an output stage | Transmitters | Jul 13, 2015 | | 0 |
|
50W linear amplifier for 40 and 80 meter band using IRFP150 MOSFETs | RF_Amplifier | Jul 13, 2015 | | 2 |
|
All-purpose 0 - 30 MHz DDS VFO and Signal Generator based on the article by WB2V in QEX July, 1997. | RF | Jul 13, 2015 | | 0 |
|
DDS based Signal Generator that runs from 1Hz to 60MHz in 1Hz steps | RF | Jul 13, 2015 | | 0 |
|
Standalone Multiband WSPR beacon transmitter (MEPT) - PDF file | Transmitters | Jul 13, 2015 | | 0 |
|
Simpler temperature datalogger based on PIC12F683 and Maxim DS18B20 | Data Acquisition | Jul 15, 2015 | | 1 |
|
Gym Agility: A Simple Strategy Game using a 4067 multiplexer and 4093 Schmitt NAND gate | Games | Jul 15, 2015 | | -1 |
|
Anti-Theft Security For Car Audios based on a CMOS NAND chip CD4093 | Alarms | Jul 15, 2015 | | -1 |
|
Luggage Security System based on UM3561 melody generator IC | Alarms | Jul 15, 2015 | | 0 |
|
Powerful buzzer for use as a doorbell or to notify others in different rooms dinner is ready etc | Misc | Jul 15, 2015 | | 0 |
|
Infrared Proximity Detector Alarm | IR | Jul 15, 2015 | | 0 |
|
General purpose alarm using discrete transistors | Alarms | Jul 15, 2015 | | -1 |
|
Simple Darkness Activated Alarm using a 555 timer | Alarms | Jul 15, 2015 | | -1 |
|
Model Railway Short-Circuit Beeper | Models | Jul 15, 2015 | | 0 |
|
Circuit diagram for a simple, gated, pulsed alarm | Alarms | Jul 15, 2015 | | -1 |
|
Simple laser alarm that gets triggered when beam from a laser pointer is broken | Laser | Jul 15, 2015 | | 0 |
|
Speed Alarm For Cars | Automotive | Jul 15, 2015 | | 3 |
|
Remote Alarm For Smoke Detector | Alarms | Jul 15, 2015 | | -1 |
|
Simple 6-Input Alarm that was designed for use in a combined garage and rumpus room | Alarms | Jul 15, 2015 | | -1 |
|
Night Alert that turns a light on for a short time when a dog is barking to scare off intruders | Alarms | Jul 15, 2015 | | 0 |
|
Simple Knock Alarm With Piezo Sensor | Alarms | Jul 15, 2015 | | 0 |
|
Smoke Alarm Battery Life Extender | Alarms | Jul 15, 2015 | | -1 |
|
Mains Supply Failure Alarm | Alarms | Jul 15, 2015 | | -1 |
|
Water Alarm Circuit Diagram | Alarms | Jul 15, 2015 | | -1 |
|
Midnight Security Light Circuit Schematic | Alarms | Jul 15, 2015 | | -1 |
|
Low Cost Burglar Alarm For Boats | Alarms | Jul 15, 2015 | | -2 |
|
Water Level Alert - 1.5V battery powered portable unit | Alarms | Jul 15, 2015 | | 0 |
|
Two-Tone Siren Using One 4093 IC | Audio | Jul 15, 2015 | | 0 |
|
Fridge Door Alarm Circuit - Beeps if you leave open the door over 20 seconds | Alarms | Jul 15, 2015 | | -1 |
|
Broken Charger Connection Alarm Circuit | Power | Jul 15, 2015 | | 1 |
|
Fire Alarm Using Thermistor | Alarms | Jul 15, 2015 | | -1 |
|
Safety Guard - Simple unit, Protects home appliances from voltage spikes | Power | Jul 15, 2015 | | 0 |
|
Powerful Security Siren - Transistors based and operates from 12V power supply | Misc | Jul 15, 2015 | | 1 |
|
Mini Alarm - Suitable for doors & windows, Portable anti-bag-snatching unit | Alarms | Jul 15, 2015 | | -2 |
|
Heart Rate Monitor based on a dual op-amp IC | Medical | Jul 22, 2015 | | 2 |
|
Model Railway Turnout Control | Models | Jul 22, 2015 | | 0 |
|
Transcutaneous Electrical Nerve Stimulator (TENS) | Medical | Jul 22, 2015 | | 0 |
|
Tablet Reminder That Uses Watch Module | Medical | Jul 22, 2015 | | 1 |
|
LED dice based on a 4060 chip | Games | Jul 22, 2015 | | 1 |
|
Cranial Electrotherapy Stimulator Circuit Diagram | Medical | Jul 22, 2015 | | 7 |
|
Pulse Generator And Signal Tracer Circuit Diagram | Test | Jul 22, 2015 | | 1 |
|
Whistle Responder - Beeps when hears your whistle, A gadget suitable for key-holders, games etc. | Misc | Jul 22, 2015 | | 0 |
|
Sleeping aid circuit diagram | Medical | Jul 22, 2015 | | -1 |
|
Digital Step-Km Counter Circuit Schematic | Medical | Jul 22, 2015 | | 1 |
|
Remote-Controlled Fan Regulator | Control | Jul 30, 2015 | | 0 |
|
Laser-Guided Door Opener | Laser | Jul 30, 2015 | | 1 |
|
Automatic Room Power Control | Control | Jul 30, 2015 | | 0 |
|
Water Level Indicator Using 7-Segment Display | Misc | Jul 30, 2015 | | 0 |
|
Rainwater Storage Gauge | Misc | Jul 30, 2015 | | -1 |
|
Cat and Dog Repeller | Misc | Jul 30, 2015 | | 0 |
|
Inexpensive Remote Watering System | Misc | Jul 30, 2015 | | 0 |
|
You Have Mail! Letterbox monitoring system | Misc | Jul 30, 2015 | | -1 |
|
Whistling Kettle | Audio | Jul 30, 2015 | | -1 |
|
Gentle breeze fan controller | Control | Jul 30, 2015 | | 0 |
|
Automatic Range Hood | Control | Jul 30, 2015 | | -1 |
|
Running 12V Fan Directly on 220V AC | Power | Jul 30, 2015 | | 1 |
|
Environmentally-friendly Mosquito Repeller | Misc | Jul 30, 2015 | | 0 |
|
Doorbell Memory Circuit Diagram | Misc | Jul 30, 2015 | | -1 |
|
Fridge-Door Open Alarm Circuit Project | Alarms | Jul 30, 2015 | | -2 |
|
Automatic Water Tank Filler Circuit Diagram | Control | Jul 30, 2015 | | 0 |
|
Digital Remote Thermometer | Data Acquisition | Jul 30, 2015 | | 0 |
|
Plant Watering Watcher Circuit Schematic | Misc | Jul 30, 2015 | | 0 |
|
Salt Taster Circuit Diagram | Misc | Jul 30, 2015 | | 1 |
|
Fridge Door Alarm Schematic 2nd Version | Alarms | Jul 30, 2015 | | 1 |
|
Room Noise Detector Circuit Schematic | Audio | Jul 30, 2015 | | -1 |
|
Heating System Thermostat Circuit | Control | Jul 30, 2015 | | 2 |
|
The Curious C-Beeper - a probe beeps at a frequency that varies with capacitance | Test | Sep 03, 2015 | | 1 |
|
DIY Digital AC Watt Meter | Test | Sep 30, 2015 | | -2 |
|
Dual Relay Driver Board Circuit Schematic | Control | Oct 06, 2015 | | 1 |
|
Relative Field Strength Meter For A DMM | Test | Oct 06, 2015 | | 1 |
|
Logic Probe With Sound | Test | Oct 06, 2015 | | 0 |
|
430J Coil Gun circuit schematic | Misc | Oct 13, 2015 | | 1 |
|
Stun gun circuit diagram and construction details | Misc | Oct 13, 2015 | | 0 |
|
Negative ion generator circuit diagram | Misc | Oct 13, 2015 | | 1 |
|
Circuit diagram for simple DIY induction heater | Misc | Oct 13, 2015 | | 1 |
|
ECG Amplifier using TLC274 opamp | Medical | Oct 22, 2015 | | 0 |
|
Railway Points Sequencer | Models | Oct 22, 2015 | | 0 |
|
Pulse rate monitor using TLC274 opamp | Medical | Oct 22, 2015 | | -1 |
|
Pills reminder alarm using CMOS logic gates | Medical | Oct 22, 2015 | | 3 |
|
Quick Counter For Young Children - encourages children to count | Games | Oct 22, 2015 | | 0 |
|
LED Noughts And Crosses | LED | Oct 22, 2015 | | -2 |
|
LED Chaser Provides Three Game Functions | LED | Oct 22, 2015 | | 1 |
|
Low-Cost Dual Digital Dice | LED | Oct 22, 2015 | | -1 |
|
Soldering Iron Tip Preserver | Misc | Oct 22, 2015 | | -2 |
|
Morse Code Beacon Keyer | Misc | Nov 30, 2015 | | 0 |
|
The WB0RIO 28 Mhz FSCW Beacon using an Arduino | Arduino | Nov 30, 2015 | | -1 |
|
FuzzniKator Push-Pull Tube Distortion/Preamp Box | Tube | Nov 30, 2015 | | -1 |
|
Voltmeter and Ammeter using PIC Microcontroller | Microcontroller | Jan 14, 2016 | | 2 |
|
PIC based digital voltmeter (DVM) | Microcontroller | Jan 14, 2016 | | -1 |
|
Arduino 7 Segment LED Display and Counter | Arduino | Apr 30, 2016 | | -1 |
|
Arduino alarm clock using 16x2 LCD module | Arduino | Apr 30, 2016 | | -1 |
|
Smart NiMh battery charger based on Attiny85 | Microcontroller | Apr 30, 2016 | | 0 |
|
Arduino based distance sensor | Arduino | Apr 30, 2016 | | -1 |
|
DIY wattmeter with an Arduino | Arduino | Apr 30, 2016 | | -1 |
|
Realtime GPS+GPRS Tracking of Vehicles Using Arduino | Arduino | Apr 30, 2016 | | -2 |
|
PC-based heart rate monitor using Arduino and Easy Pulse sensor | Medical | Apr 30, 2016 | | -1 |
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GSM Home Security Alarm System with Arduino | Arduino | Apr 30, 2016 | | -1 |
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DIY intervalometer based on Arduino | Photo | Apr 30, 2016 | | -1 |
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Arduino based line following robot in 10 minutes | Arduino | Apr 30, 2016 | | 1 |
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Arduino High speed Oscilloscope with PC interface | Arduino | Apr 30, 2016 | | -1 |
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Arduino LCD digital clock using a DS1307 RTC | Arduino | Jun 28, 2016 | | -1 |
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XBee ZNet 2.5 Wireless Accelerometer | Data Acquisition | Jun 28, 2016 | | 0 |
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UHF amplifier for 400 ~ 850MHz using a 2SC3358 transisor | RF_Amplifier | Jun 28, 2016 | | -2 |
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HF 10W Power Amplifier | RF_Amplifier | Jun 28, 2016 | | -2 |
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144 MHz 125W Power Amplifier | RF_Amplifier | Jun 28, 2016 | | 3 |
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High power mobile phone Jammer circuit | Telephone | Jun 28, 2016 | | -3 |
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Arduino RF power meter that measures - 43 dBm to - 3 dBm, 1 MHz to 10 GHz using AD8319 and TMP101 | Arduino | Jul 03, 2016 | | -1 |
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DIY 4-Digit LED Digital Voltmeter Module based on ATmega8 | Test | Jul 03, 2016 | | 0 |
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Microphone preamplifier using an LM321 for interfacing an electret microphone to Arduino | Arduino | Jul 03, 2016 | | -1 |
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TTL UART to RS232 level converter using ST232CDR | PC | Jul 03, 2016 | | 0 |
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UART - USB Adapter using a MCP2200 | PC | Jul 03, 2016 | | 0 |
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UART - XPORT Adapter to allow embedded devices to be accessed from an Ethernet network | PC | Jul 03, 2016 | | 0 |
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USB - IR - Transceiver (aka Ghetto Blaster) | IR | Jul 03, 2016 | | 0 |
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USB - PLL / DDS - Interface | PC | Jul 03, 2016 | | 0 |
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AD9833 Micro Waveform Generator for an Arduino | Arduino | Jul 03, 2016 | | -1 |
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ARDUINO/Genuino 'Pocket Calculator' Shield | Arduino | Jul 03, 2016 | | -1 |
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Countdown timer using an Arduino | Arduino | Jul 03, 2016 | | 0 |
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Arduino based environmental datalogger system | Arduino | Jul 03, 2016 | | -1 |
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Arduino precision voltage reference based on a REF102 reference source | Arduino | Jul 03, 2016 | | -1 |
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Arduino shield to make a transistor curve tracer | Arduino | Jul 03, 2016 | | 0 |
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Arduino Scalar Network Analyzer, 60 MHz, 80 dB | Arduino | Jul 03, 2016 | | -1 |
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DIY Dual Directional Coupler, 5 - 1000 MHz, 20 dB | RF | Jul 03, 2016 | | 1 |
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High Voltage Power Supply step-up converter using a MC34063 ideal for a geiger counter or nixie tube | Tube | Jul 03, 2016 | | 0 |
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Low Voltage Power Supply / step down using a MC34063 | Power | Jul 03, 2016 | | 1 |
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A small power supply for universal use based on an LM317 adjustable regulator | Power | Jul 03, 2016 | | 1 |
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Linear regulated bench power supply 20V, 2A - easy to upgrade | Power | Jul 03, 2016 | | 0 |
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Bench power supply with buck converter with a linear afterburner | Power | Jul 03, 2016 | | 0 |
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Small 2.5 - 50V power supply for universal use based on a LT1074 | Power | Jul 03, 2016 | | 1 |
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Linear Power Supply 8 .. 16 V ~ 10A that offers low noise | Power | Jul 03, 2016 | | -1 |
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Artificial ground to transform an Unipolar Power Supply into a Bipolar Power Supply | Power | Jul 03, 2016 | | 1 |
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Broadband UHF Amplifier | RF_Amplifier | Jul 03, 2016 | | -4 |
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A universal VCO Board using a MC100EL1648DG and a PGA-103+ as buffer | RF | Jul 03, 2016 | | -1 |
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A universal XCO/PLL Board that replaces crystal oscillator modules | Timing | Jul 03, 2016 | | 0 |
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MEMS oscillator evaluation board for SiT8008/SiT8208/SiT8209 from SiTime | Timing | Jul 03, 2016 | | 0 |
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Homebrew DDS Generator (with AD9851) V2.0 | Timing | Jul 03, 2016 | | 1 |
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Mini RF frequency synthesizer using an MC12095 and MC12080 or MB 501 | RF | Jul 03, 2016 | | 1 |
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10 kHz to10 GHz LED-Bargraph Power Meter - W1GHZ | RF | Jul 24, 2016 | | 3 |
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RF Power Calibrator | Test | Jul 24, 2016 | | 0 |
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TDR Test System - WA0PIA | Test | Jul 24, 2016 | | 2 |
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Satellite Finder | Test | Jul 24, 2016 | | -3 |
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Lighting Storm Monitor | Misc | Jul 24, 2016 | | -1 |
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Simple Crystal Tester - F5JTZ | Test | Jul 24, 2016 | | 2 |
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Variable PIN Attenuator 1dB to 20dB | RF | Sep 07, 2016 | | 0 |
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L-C-R Bridge - G3BIK | Test | Sep 07, 2016 | | 0 |
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Microwave Motion Detector | Alarms | Sep 07, 2016 | | -1 |
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UHF Movement Detector | Alarms | Sep 07, 2016 | | -2 |
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UHF Doppler Motion Detector | Alarms | Sep 07, 2016 | | -2 |
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Metal Detector 1 MHz | Metal | Sep 07, 2016 | | 2 |
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Metal Detector Simple BFO | Metal | Sep 07, 2016 | | 1 |
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Ultrasonic Proximity Detector | Alarms | Sep 07, 2016 | | 1 |
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Ultrasonic Radar Alarm Circuit | Alarms | Sep 07, 2016 | | -1 |
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Power Supply 13.8V/20A | Power | Sep 07, 2016 | | 0 |
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300 Hz - 3 kHz Microphone Filter | Filter | Sep 07, 2016 | | 0 |
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Variable CW Bandpass Filter | Filter | Sep 07, 2016 | | 0 |
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Dynamic Noise Filter | Filter | Sep 07, 2016 | | -1 |
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40dB Audio Notch Filter | Filter | Sep 07, 2016 | | 0 |
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Headphone MOSFET Amplifier | Amplifiers | Sep 07, 2016 | | -1 |
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3.5W Low Distortion Audio Power Amplifier | Amplifiers | Sep 07, 2016 | | -3 |
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Perfect Sinus 1 kHz Oscillator | Timing | Sep 07, 2016 | | 0 |
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Carbon Mike Preamp BPF - W6GXN | Preamp | Sep 07, 2016 | | -2 |
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Microphone Preamp MC-80 | Preamp | Sep 07, 2016 | | 3 |
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1MHz-step Harmonic Marker Generator | Test | Sep 07, 2016 | | 1 |
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1 Hz to 10 MHz Voltage to Frequency Converter | Misc | Sep 07, 2016 | | 0 |
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Tunable Audio Filter | Filter | Sep 07, 2016 | | 1 |
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Infrared Audio Transmitter-Receiver | IR | Sep 07, 2016 | | 2 |
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RF Activated Relay - W7ZOI | RF | Sep 07, 2016 | | 0 |
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Wide Bandwidth Cell Phone Jammer | Misc | Sep 07, 2016 | | -1 |
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800 MHz Base Station Chaos Jammer | Misc | Sep 07, 2016 | | -1 |
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800 MHz Phone Jammer | Misc | Sep 07, 2016 | | 0 |
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1900 MHz Phone Jammer | Misc | Sep 07, 2016 | | 0 |
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GSM Phone Jammer - P2JBZ | Misc | Sep 07, 2016 | | 0 |
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Near-Field PCS Phone Jammer | Misc | Sep 07, 2016 | | 1 |
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PCS Phone Jammer | Misc | Sep 07, 2016 | | -1 |
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Laser RX/TX Audio | Laser | Sep 07, 2016 | | 0 |
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Device to monitor the power supply voltages of Commodore computers and warn if they are out of spec | PC | May 01, 2015 | | -1 |
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Digital Logic Based LED Christmas Tree with 64 LEDs (constructed vertically from circuit board) | LED | May 01, 2015 | | 0 |
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Nixie-Clock using Neon Lamps to form Logic Gates | Tube | May 01, 2015 | | 0 |
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555 based beeper signals when file finished loading from Commodore computer tape drive | PC | May 01, 2015 | | 0 |
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Logic IC Tester with PC Parallel Port Interface - using 8255 Interface IC | Test | May 01, 2015 | | -1 |
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555 Based Switch for R/C receivers can be used without loss of R/C channels | Models | May 01, 2015 | | 0 |
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Adapter to use Mega Drive / Genesis Controllers with a Vectrex Video Game Console | Games | May 01, 2015 | | 0 |
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600 MHz to 2.2GHz VCO | Timing | Sep 14, 2016 | | 0 |
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800 MHz to 2.2GHz Push-Pull VCO | Timing | Sep 14, 2016 | | 0 |
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Audio/Video Transmitter | Video | Sep 14, 2016 | | 1 |
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AM TV Transmitter | Video | Sep 14, 2016 | | 1 |
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23cm ATV FM Transmitter | Video | Sep 14, 2016 | | 1 |
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A-V UHF TV Modulator | Video | Sep 14, 2016 | | 2 |
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Crystal TV Video Modulator | Video | Sep 14, 2016 | | 0 |
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TV Audio-Video Transmitter | Video | Sep 14, 2016 | | 1 |
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Simple TV Video Modulator | Video | Sep 14, 2016 | | 0 |
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TV Modulator | Video | Sep 14, 2016 | | 1 |
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1.3 GHz FMTV Receiver - ZL1WTT | Video | Sep 14, 2016 | | 0 |
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1.3 GHz ATV FM Transmitter - IZ3CTS | Video | Sep 14, 2016 | | 0 |
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10 GHz ATV Modulator Gunn-Diode - GW6BWX | Video | Sep 14, 2016 | | 1 |
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432 MHz to Ch2 ATV Converter - W9NTP | Video | Sep 14, 2016 | | -1 |
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10 GHz Small ATV Transmitter - HB9SLV | Video | Sep 14, 2016 | | 1 |
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UHF 2W AM ATV Transmitter | Video | Sep 14, 2016 | | 0 |
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UHF 5W AM ATV Transmitter | Video | Sep 14, 2016 | | 1 |
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902 MHz PLL FM ATV Transmitter | Video | Sep 14, 2016 | | -1 |
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Metal Detector Heathkit GD-1190 | Metal | Sep 14, 2016 | | -2 |
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Metal Detector Heathkit GR-1290 | Metal | Sep 14, 2016 | | 2 |
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Gunn diode proximity detector | Alarms | Sep 14, 2016 | | -1 |
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Infrared Proiximity Detector using a CA3240 | Alarms | Sep 14, 2016 | | -3 |
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Thermal Proximity Detector using a RPW100 | Alarms | Sep 14, 2016 | | 0 |
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AVR-PG1 - Serial port (RS232) PONY PROG compatible AVR programmer | Programmers | Sep 14, 2016 | | 0 |
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ISP Flash Microcontroller Programmer for 8051 and AVR series devices | Programmers | Sep 14, 2016 | | -2 |
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Arduino Flame Sensor Interface | Arduino | Sep 14, 2016 | | -1 |
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Electronic Stethescope Amplifier Circuit | Medical | Sep 14, 2016 | | -1 |
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Open Source Optical Flash Trigger that Works with Any Camera | Photo | Sep 26, 2016 | | 0 |
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Build a Raspberry Pi-Based Cable Shutter Release for Sony Cameras | Photo | Sep 26, 2016 | | 0 |
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Collection of high-speed flash photography circuit diagrams | Photo | Sep 26, 2016 | | 0 |
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50 kHz to 70 MHz Spectrum Analyzer - K7TAU | Test | Sep 28, 2016 | | 0 |
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Spectrum Analyzer on the Oscilloscope | Test | Sep 28, 2016 | | 2 |
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0 to 60 MHz Spectrum Analyzer - WB5IPM | Test | Sep 28, 2016 | | -1 |
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Spectrum Analyzer using TV-Tuner - W6WTU | Test | Sep 28, 2016 | | 1 |
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1 GHz Spectrum Analyzer Front-End | Test | Sep 28, 2016 | | 0 |
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100 MHz Spectrum Analyzer - W6URH | Test | Sep 28, 2016 | | -1 |
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0 - 100 MHz Spectrum Analyzer Tracking Generator - W6URH | Test | Sep 28, 2016 | | 0 |
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Panoramic Spectrum Analyzer for HF Receivers - WA6NCX | Test | Sep 28, 2016 | | 0 |
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TV Tuner Spectrum Analyzer - WA2PZO | Test | Sep 28, 2016 | | 0 |
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20 MHz to 600 MHz Spectrum Monitor | Test | Sep 28, 2016 | | 0 |
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IF for TV-Tuner for Spectrum Analyzers - AA4FB | Test | Sep 28, 2016 | | 0 |
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200 MHz Spectrum Analyzer | Test | Sep 28, 2016 | | 3 |
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45 MHz to 2050 MHz Spectrum Analyzer | Test | Sep 28, 2016 | | -3 |
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10 GHz Transceiver from a Radar Detector - WA5VJB | RF | Sep 28, 2016 | | 0 |
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161 kHz Metal Detector | Metal | Sep 28, 2016 | | 0 |
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200 kHz Metal Detector | Metal | Sep 28, 2016 | | 1 |
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Baxandall Audio Filter | Filter | Sep 28, 2016 | | 1 |
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Active Audio BPF 1kHz Bandwidth | Filter | Sep 28, 2016 | | 0 |
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CW Filter - DL7HG | Filter | Sep 28, 2016 | | -1 |
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Dynamic Mike Preamplifier for IC-706 - W5RK | Preamp | Sep 28, 2016 | | -2 |
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Mike Preamplifier with Dynamic Compressor | Preamp | Sep 28, 2016 | | -4 |
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Variable Audio Notch Filter - K4VIZ | Filter | Sep 28, 2016 | | 1 |
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Simple FET Audio Filter | Filter | Sep 28, 2016 | | 0 |
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Two-Tone Audio Generator - M0DGQ | Timing | Sep 28, 2016 | | 0 |
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Microphone Preamplifier with Variable Gain LM358 | Preamp | Sep 28, 2016 | | -8 |
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Ipod Shuffle Usb Cable Wiring Diagram | PDA | Sep 28, 2016 | | 0 |
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Laser Diode Modulator | Laser | Oct 02, 2016 | | 1 |
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VOX circuit diagram (voice operated relay) | Audio | Oct 02, 2016 | | 1 |
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RX/TX 27 MHz Wireless Remote Control | Control | Oct 02, 2016 | | 1 |
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3-Tones Controlled Relay | Control | Oct 02, 2016 | | 0 |
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Once pulse per pushbutton press circuit diagram | Misc | Oct 02, 2016 | | 0 |
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Wireless AM Microphone | Transmitters | Oct 02, 2016 | | 0 |
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0.5W FM Transmitter 88MHz-108MHz | Transmitters | Oct 02, 2016 | | -1 |
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Laser-Torch Wireless Communication | Laser | Oct 08, 2016 | | 0 |
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MOSFET Temperature Protection | Misc | Oct 08, 2016 | | 0 |
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FM Laser Transceiver - VK7MU | Laser | Oct 08, 2016 | | 0 |
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Laser Detector - W4KAE | Laser | Oct 08, 2016 | | 1 |
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CW-PWM-AM Laser Transceiver - G0MRF | Laser | Oct 08, 2016 | | 0 |
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Build a USB Powered AA NiMH and NiCd Battery Charger | PC | Oct 15, 2016 | | 0 |
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BattMan II: Build a Computer Controlled Battery Manager | Power | Oct 15, 2016 | | 0 |
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Build a High Speed NiCd Charger for Electric R/C | Models | Oct 15, 2016 | | 0 |
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Build a Low Cost Thermal Peak Detection NiCd Charger | Power | Oct 15, 2016 | | -1 |
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Build a Miniature High-Rate Speed Control with Battery Eliminator Circuit (BEC) | Models | Oct 15, 2016 | | 0 |
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Build a Miniature High-Rate Speed Control with Brake | Models | Oct 15, 2016 | | 2 |
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Build an Analog Bar Graph Expanded Scale Voltmeter | Test | Oct 15, 2016 | | 0 |
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Build an LED Bargraph Optical Tachometer | Test | Oct 15, 2016 | | 1 |
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Build an On/Off Motor Controller with Brake | Control | Oct 15, 2016 | | 0 |
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Building a Musical Sunrise Quartz Alarm Clock | Music | Oct 15, 2016 | | 0 |
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Chord EGG 2015: Remaking a PAiA Classic | Music | Oct 15, 2016 | | -1 |
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Retronome – A Versatile Analog Drum Machine for My Hammond Organ | Music | Oct 15, 2016 | | 3 |
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Make a Dual-Boot IDE Cable | PC | Oct 15, 2016 | | -1 |
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Handheld GPS Glareshield (or Dashboard) Mount with Power Supply | Misc | Oct 15, 2016 | | 0 |
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Home built glow plug ignitor and remote control | Models | Oct 16, 2016 | | 0 |
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Power Supply for Battery Valve Radios | Tube | Oct 16, 2016 | | 0 |
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RF Sweeper - VK2ZAY | Test | Oct 17, 2016 | | 2 |
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Pure Sine-Wave Wien Oscillator | Timing | Oct 17, 2016 | | 1 |
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Radar Detector - W1SNN | Misc | Oct 17, 2016 | | -1 |
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2 GHz to 10 GHz Cavity Multiplier | RF | Oct 17, 2016 | | 3 |
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2 GHz - 7 GHz Wideband BPF | Filter | Oct 17, 2016 | | 0 |
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900 MHz Trisection Microstrip BPF | Filter | Oct 17, 2016 | | 0 |
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Metal Detector 650 kHz | Metal | Oct 17, 2016 | | 2 |
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Metal Detector 1 MHz 3xBJT | Metal | Oct 17, 2016 | | 1 |
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Metal Detector 3xBJT Homemade | Metal | Oct 17, 2016 | | -6 |
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Metal Detector 5.5 MHz | Metal | Oct 17, 2016 | | -3 |
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Metal Detector 111 kHz | Metal | Oct 17, 2016 | | 10 |
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Metal Detector 130 kHz | Metal | Oct 17, 2016 | | 3 |
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Metal Detector 140 kHz | Metal | Oct 17, 2016 | | -3 |
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Metal Detector 300 kHz | Metal | Oct 17, 2016 | | 1 |
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Metal Detector 300 kHz PLL | Metal | Oct 17, 2016 | | 1 |
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Metal Detector 300 kHz PNP | Metal | Oct 17, 2016 | | 23 |
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Metal Detector 455 kHz | Metal | Oct 17, 2016 | | 2 |
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Metal Detector 625 kHz | Metal | Oct 17, 2016 | | 6 |
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Metal Detector 4001 - ZL2PD | Metal | Oct 17, 2016 | | 1 |
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Metal Detector Beat Balance | Metal | Oct 17, 2016 | | 3 |
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Metal Detector - JF1OZL | Metal | Oct 17, 2016 | | -1 |
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Metal Detector Pin Detector | Metal | Oct 17, 2016 | | -1 |
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Metal Detector PLL 4046 Beachcomber | Metal | Oct 17, 2016 | | 12 |
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Metal Detector Simple 3xBJT BFO | Metal | Oct 17, 2016 | | -6 |
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Metal Detector Surfmaster Pi | Metal | Oct 17, 2016 | | 28 |
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Metal Detector Toro | Metal | Oct 17, 2016 | | -50 |
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Ultrasonic Proximity Detector 2xBJT | Misc | Oct 17, 2016 | | 0 |
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Precise Movement Meter | Misc | Oct 17, 2016 | | 0 |
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Proximity Detector NE567 | Misc | Oct 17, 2016 | | -1 |
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Charge-Pump Voltage Doubler with Regulator | Power | Oct 20, 2016 | | 3 |
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Power Supply LCD meter Display - K1QW | Power | Oct 20, 2016 | | -1 |
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12V to 110V/220V DC-AC 300W Inverter | Power | Oct 20, 2016 | | -2 |
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1.5V to 5V 200mA Converter | Power | Oct 20, 2016 | | -2 |
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DC Current Monitor | Misc | Oct 20, 2016 | | 0 |
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Air-Speed Sensor for Cooling Fan | Control | Oct 20, 2016 | | 0 |
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Proportional Temperature Control for Gunnplexer - W4UCH | Misc | Oct 20, 2016 | | 1 |
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Fan Speed Temperature Controller - DH8AG | Control | Oct 20, 2016 | | 2 |
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Optical LED Transmitter | LED | Oct 20, 2016 | | 1 |
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Ultrasonic Bat Receiver - M0DGQ | Misc | Oct 20, 2016 | | 0 |
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Theremin with MC1496 | Music | Oct 20, 2016 | | 2 |
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Zener Diode Emulator - WA5EKA | Test | Oct 20, 2016 | | 2 |
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Wireless IR Headphone RX-TX CD4046 | IR | Oct 20, 2016 | | -1 |
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Measuring speed of light using an oscilloscope | Misc | Oct 20, 2016 | | -1 |
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Two chips LED Frequency Counter - PA2OHH | Test | Oct 20, 2016 | | 1 |
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1 MHz to 1 GHz LED Absorption Meter - GW1TDV | RF | Oct 20, 2016 | | 0 |
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True Linear RF Power Detector | RF | Oct 20, 2016 | | 2 |
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500 kHz to 3 GHz LED Field-Strength Meter | RF | Oct 20, 2016 | | 1 |
|
100 MHz - 2.5 GHz LED RF Signal Meter AD8313 | RF | Oct 20, 2016 | | 1 |
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800 MHz Phone Jammer ver.A | Misc | Oct 20, 2016 | | 5 |
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Noise Canceling Electret Microphones - WB9YBM | Audio | Oct 22, 2016 | | 0 |
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1W Audio Amplifier with Compressor | Amplifiers | Oct 22, 2016 | | -3 |
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High-Gain Audio Amplifier for Headphones - W7ZOI | Amplifiers | Oct 22, 2016 | | -6 |
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Active BPF 741 - WA5SNZ | Filter | Oct 22, 2016 | | 0 |
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1 kHz Quadrature Oscillator | Timing | Oct 22, 2016 | | 0 |
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High-Impedance RF Probe | Test | Oct 22, 2016 | | 2 |
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Time Domain Reflectometry Generator - PA3DSC | Test | Oct 22, 2016 | | 5 |
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Ultra Simple CRT Oscilloscope | Tube | Oct 22, 2016 | | -1 |
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400 kHz - 30 MHz Low Noise X-tal Oscillator - DJ2LR | Timing | Oct 29, 2016 | | 0 |
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1 GHz Test Oscillator BFP450 | Test | Oct 29, 2016 | | 1 |
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DIY ECG Patient Simulator / ECG Tester | Medical | Oct 29, 2016 | | -5 |
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Microscope conversion to LED-Light with two transistor current source | LED | Oct 29, 2016 | | -1 |
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Precision Voltage Reference for Multimeter Calibration | Test | Oct 29, 2016 | | 0 |
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DIY LAN Cable Tester | Test | Oct 29, 2016 | | -2 |
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IR Remote Control Jammer | IR | Aug 21, 2021 | | -2 |
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Doppler Radar Sensor using CDM324 24GHz radar modules | Data Acquisition | Sep 06, 2022 | | 1 |
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Analog front-end / amplifier for CDM324 24GHz radar module | Data Acquisition | Sep 06, 2022 | | 1 |
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40MHz-Frequency counter with ATmega8 | Test | Sep 30, 2022 | | 0 |
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Solar powered, 2-cell Li-Ion battery charger using the LT3652 | Solar | Jan 28, 2023 | | 0 |
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