There are 92 circuit schematics available in this category. Click here for all circuit diagrams. Last circuit added on Thursday, 30 July 2015.

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CircuitCategoryDate AddedOK?Votes 
Egg timer circuit diagram, PCB layout and assembly informationTiming 2
Digital Clock with Alarm Using DS1307TimingMar 25, 20090
Digital timer with 7-segment display and pushbuttonsTimingMar 25, 20090
Simple Sine Wave Oscillator including a PCB layoutTimingSep 23, 20090
Direct Digital Synthesis VFO for HF Bands - based on Analog Devices AD7009 DDS (PDF)TimingOct 05, 2009-1
Continuous Coverage V.F.O. for H.F. (PDF)TimingOct 05, 20090
PCB exposure countdown timer based on an Atmel ATtiny2313TimingJun 28, 20110
Long Time Period Automatic TimerTimingOct 25, 20140
Trangular wave generatorTimingMar 23, 20150
Triangle / Squarewave Generator using a 1458 dual opampTimingOct 21, 20090
3 - 12 MHz Signal GeneratorTiming 0
Signal Frequency Beat Frequency OscillatorTiming 0
Wide-swing Variable Crystal OscillatorTiming 0
CA4060B Timer CircuitsTimingSep 10, 20060
Special Function Timer Circuits (LM555)TimingSep 10, 20060
10MHz GPS disciplined frequency standardTimingJun 19, 20110
Simple WWV receiver for 10 MHz calibration signalTimingApr 12, 20140
DDS/PLL based VFO synthesizerTimingOct 07, 20091
Timer circuit based on a 14536 and 4011 CMOS chips that can be calibrated using a frequency counterTimingJan 31, 20100
Audible timer that can be used as a cooking timer for roasting peanuts for exampleTimingJan 31, 20100
Selection of 14 oscillator circuits include sinewave, audio, logic and LED flashersTimingFeb 20, 20100
Function Generator Sine / Triangle / Square / Saw / Burst Sweep Noise based on PIC16F870TimingMay 16, 20100
455KHz oscillator using FET and 455KHz IF transformerTimingMay 25, 20120
Build a synchronous clock locked to the mains frequencyTimingAug 18, 20090
AF variable frequency generator using 555 ICTiming 0
Crystal switcher using diodesTiming 0
IC oscillator 1...30MHz using 74LS04 chipTiming 0
Simple AF-oscillator / signal generator using pair on 2N2222 transistorsTiming 0
Digital clock based on 74 series logicTiming 0
Two nixie display clockTiming 0
VFD (vacuum flourescent display) clockTiming 0
Single-digit Nixie clockTiming 0
Oscilloscope CRT ClockTiming 0
Weston Voltmeter ClockTiming 0
Binary clock using LED matrix to display a binary clock with 6 digits of 4 binary bits eachTiming 0
Digital clock that receives and displays the time from the Rugby MSF radio transmission (PIC16F877)Timing 0
Line powered 60Hz clock generator (PDF)TimingJan 26, 20010
Micro-power pulse generator (PDF)TimingJan 26, 20010
Divide by 1.5 counter (PDF)TimingJan 26, 20011
High-output square wave generator (PDF)TimingJan 26, 20010
D Flip-flot one-shot circuits (PDF)TimingJan 26, 20010
Equivalent circuit and SPICE model of 555 timerTimingApr 11, 20110
Op Amp Triangle-Wave Generator circuit diagram and SPICE simulation filesTimingJan 17, 20110
Wien Bridge Oscillator with SPICE simulationTimingMar 26, 20110
Clock dividerTimingJan 26, 20010
Clock doublerTimingJan 26, 20010
CMOS oscillator using 74C14 inverting Schmitt triggerTimingJan 26, 20010
Crystal 32.768KHz CMOS OscillatorTimingJan 26, 20010
Crystal oscillator using a CMOS or HCMOS inverterTimingJan 26, 20010
Cheap 40KHz clock using one gate of a 74C14TimingJan 26, 20010
Astable 40KHz clockTimingJan 26, 20010
'Rounding Off' a square waveTimingJan 26, 20010
Switch debounce using 555TimingJan 26, 20010
Square wave to sine wave converterTimingJan 26, 20010
Triangle / Square wave generatorTimingFeb 21, 20050
Binary clock circuit diagramTimingAug 18, 20090
Experimental DDS frequency synthesizer uses the AD9851TimingOct 08, 20090
LED matrix clock circuit diagramTimingAug 18, 20090
Giant nixie clock circuit diagramTimingAug 18, 20090
Panel-mounting clock circuit diagramTimingAug 18, 20090
Sidereal clock project with circuit diagramsTimingAug 18, 20090
Simple Function Generator using TL084 or other opampTiming 0
Micropower pulse generator (PDF)TimingJan 26, 20010
Simple GPS Stabilised 10 MHz OscillatorTiming 1
xTimer V1.0 a 4-Channel Timer based on a 89C4051 + MAX7219 display driverTimingApr 22, 20140
xTimer using CMOS shift register 4094 for driving 7-segment LED directlyTimingApr 22, 20140
Ice Tube Clock - Vacuum fluorescent display (VFD) clockTimingOct 12, 20090
DCF-77 PIC LED clock (DCF77 is the name of a German radio station on 77.5 KHz)TimingJun 27, 20100
DCF77 PIC16F84A Single-Nixie clock (DCF77 is the name of a German radio station on 77.5 KHz)TimingJun 27, 20100
24" Wall ClockTiming 0
Sleep TimerTiming 0
Super VXOTiming 0
High Precision GPS/TV controlled Reference OscillatorTimingMay 01, 20040
TV based Receiver for a Standard Frequency GeneratorTimingMay 01, 20040
AD9852 DDS schematicTimingFeb 14, 20030
Decimal DDS Signal GeneratorTiming 0
Build A 100Khz Crystal CalibratorTiming 0
Crystal heater / temperature stablization circuit (TXCO)Timing 0
A GPS receiver based frequency standardTimingMar 23, 20030
Long duration timer using 4060 12-stage binary ripple counterTimingAug 17, 20090
Clock generatorTimingJan 26, 20010
555 Timer Tutorial + CircuitsTimingJan 26, 20010
All-Ears QSK Timing GeneratorTimingMay 19, 20150
Monostable multivibratorTimingJan 01, 20030
GPS-based universal clock generatorTiming 0
Homemade scope clock using a DG7 tube and a Microchip PIC16F876Timing 0
VCO covers 300MHz to 500MHz based on Maxim MAX2608 VCOTiming 0
Push Button Switch DebouncerTimingJan 26, 20010
Square wave oscillator using CMOS 4011 NAND chipTimingJan 26, 20010
5 to 30 Minute Timer circuit diagramTimingNov 27, 20020
NE555 Basic MonostableTimingNov 27, 20020
Clock project based on National Semincondutor MM5402NTimingJul 05, 20150