Circuit | Category | Date Added | OK? | Votes | |
13.8V 30-40A Power Supply (PDF) | Power | | | 84 |
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Car Ignition Coil Driver from 110V AC | Power | Sep 23, 2009 | | -10 |
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Amplified zener regulator | Power | | | -4 |
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Car Ignition Coil Driver from 12V DC - Can be used as an electric fence | Power | Sep 23, 2009 | | 3 |
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Battery Charger, Current and Voltage Regulated for Sealed Lead Acid batteries | Power | | | -7 |
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Voltage and current regulated power supply | Power | Sep 23, 2009 | | -3 |
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Simple switching power supply (mains operated) | Power | Sep 23, 2009 | | 3 |
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12 Volt Switching Power Supply circuit diagram and PCB layout | Power | Sep 23, 2009 | | -6 |
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Simple voltage booster based on Linear Technologies LT1372, includes PCB design | Power | Sep 23, 2009 | | -1 |
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Alkaline battery charger | Power | Dec 02, 2002 | | 0 |
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Highly accurate constant current source using LM4140, OP777 and MOSFET | Power | Mar 17, 2014 | | -2 |
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Dry cell battery charger | Power | Dec 07, 2014 | | 4 |
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Power Supply Resumption Alarm using 555 timer | Power | Oct 25, 2014 | | -4 |
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Solid-state voltage indicator with high voltage cutout | Power | Dec 07, 2014 | | 0 |
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Stabilized Power Supply With Short-Circuit Indication | Power | Oct 25, 2014 | | -1 |
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Capacitor voltage stepper using 555 timer | Power | Dec 07, 2014 | | -2 |
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Low Voltage Alarm for batteries and other volatile DC power sources | Power | Jun 26, 2009 | | -3 |
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Voltage Monitor using UA741 operational amplifier | Power | Oct 19, 2009 | | -3 |
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Expanded Scale Battery Volt Meter | Power | Sep 17, 2009 | | 0 |
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Battery Low Voltage Beeper | Power | Sep 17, 2009 | | -1 |
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Low Cost Universal Battery Charger | Power | Jan 08, 2014 | | -2 |
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26V-to-5000V DC-DC Converter | Power | Jan 08, 2014 | | -2 |
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Fast Charger for Better Lead-Acid Battery Life | Power | Oct 03, 2013 | | 0 |
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5 A Constant Voltage-Constant Current Regulator | Power | Oct 03, 2013 | | -1 |
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1A Variable Regulated Power Supply | Power | | | -1 |
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Regulated Power Supply Circuits | Power | Sep 10, 2006 | | 0 |
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Basic Solid State Relays | Power | Sep 10, 2006 | | -3 |
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LM311 Thermostat circuit diagrams | Power | | | -1 |
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Transformer Secondary Voltage Reduction | Power | | | 1 |
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Back And Forth - Bidirectional Bipolar Stepper Motor Driver | Power | | | 1 |
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High Side Current Monitors (LM358, Zetex - ZXCT-1009) | Power | Sep 10, 2006 | | 0 |
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Low Battery Voltage Cutout Circuits | Power | Sep 10, 2006 | | -2 |
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Preselect Twin Coil Switch Machine Circuit | Power | | | -3 |
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N.O. Magnetic Reed Switch ON /OFF Circuit (SCR equivalent) | Power | | | -2 |
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Team digital - SCR16 - Twin Coil Switch Machine Adapter | Power | | | -1 |
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Efficient unipolar stepper motor driver (only uses power when it makes a step) | Power | | | 0 |
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Alternative power source for Magellan GPS receivers | Power | May 01, 2004 | | 0 |
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Battery voltage monitor using an LM358 op-amp | Power | Apr 12, 2014 | | -1 |
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0-14 volt, 0-2 amp current limited variable power supply regulator | Power | | | -2 |
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A Variable power supply with adjustable current limiting. 0-14V output up to 5A current. | Power | Apr 12, 2014 | | 0 |
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Dynamo Current and Voltage Regulator | Power | Sep 21, 2006 | | -2 |
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General purpose portable DC power supply using rechargeable C cells | Power | Feb 05, 2010 | | -2 |
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Bench power supply that allows a number of varying output voltages to be preset. Includes PCB layout | Power | Feb 26, 2010 | | -2 |
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Power supply metering circuits for measuring both voltage and current | Power | Feb 09, 2010 | | -5 |
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Emergency power system | Power | May 16, 2010 | | -3 |
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Digital bench power supply based on a PIC16F870 | Power | May 24, 2010 | | -2 |
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Lithium Ion Battery Charger based on a PIC micro including circuit diagram and source code | Power | May 24, 2010 | | 0 |
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6V to 12V Converter | Power | | | -2 |
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Automatic 12V Lead Acid Battery Charger | Power | Sep 01, 2009 | | 0 |
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Solid State Tesla Coil/High Voltage Generator | Power | Sep 01, 2009 | | -1 |
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12V to 120V Inverter circuit diagram | Power | Sep 01, 2009 | | -4 |
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Basic Power Supply | Power | Sep 01, 2009 | | 2 |
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High Current Power Supply | Power | Sep 01, 2009 | | -1 |
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Dual Polarity Power Supply | Power | Sep 01, 2009 | | -1 |
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High Voltage High Current Power Supply | Power | Sep 01, 2009 | | -3 |
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Transformerless Power Supply | Power | Sep 01, 2009 | | -5 |
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Fixed Voltage Power Supply | Power | Sep 01, 2009 | | -1 |
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Voltage Inverter using 555 Timer | Power | Sep 01, 2009 | | -2 |
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Voltage Inverter using LM380 audio amplifier IC | Power | Sep 01, 2009 | | -3 |
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Dual power supply | Power | Jan 31, 2003 | | -1 |
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Negative voltage generator | Power | Aug 12, 2001 | | 1 |
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Power reminder beeper (PDF) | Power | Jan 26, 2001 | | -1 |
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Unplugged power cord alarm | Power | Jan 26, 2001 | | -1 |
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Machine power loss beepter (PDF) | Power | Jan 26, 2001 | | -1 |
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Op-Amp Current Source with Floating Load including SPICE simulation | Power | Mar 26, 2011 | | -1 |
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Dual Polarity Unregulated PSU For High-End Audio Amps | Power | Nov 13, 2010 | | -1 |
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High Voltage Converter: 90V From 1.5V | Power | Nov 13, 2010 | | -1 |
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Charge Monitor for 12V lead acid battery | Power | | | 0 |
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NiCd Cell Charger | Power | | | -2 |
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Basic UPS Power Supply | Power | Feb 21, 2005 | | 0 |
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Fuse monitor / alarm | Power | Feb 21, 2005 | | -1 |
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Voltage monitor with LED indicator | Power | Feb 21, 2005 | | -2 |
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High current regulated power supply | Power | Oct 31, 2002 | | -1 |
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Adjustable power supply using LM317 | Power | Jan 26, 2001 | | -2 |
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Simple +5V power supply circuit | Power | Jan 26, 2001 | | -1 |
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Basic 78xx series regulator mains power supply circuit diagram | Power | Oct 25, 2009 | | -2 |
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USB charger circuit diagram | Power | Aug 18, 2009 | | 0 |
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Advanced High Voltage PSU circuit | Power | | | -1 |
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12 Vdc - 120 Vac Inverter Schematic | Power | Jan 01, 2003 | | -2 |
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Single to 3-phase power conversion | Power | | | -1 |
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Breadboard supply - very low dropout adjustable power supply | Power | Oct 12, 2009 | | 0 |
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Small battery-powered USB charger including circuit diagram and PCB layout | Power | Oct 12, 2009 | | 0 |
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3.3V / 5V Regulated Power Supply Circuit | Power | Jul 03, 2011 | | 2 |
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Lead-Acid Battery Monitor | Power | | | 0 |
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Simple switching power supply | Power | Jul 10, 2002 | | -1 |
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AC Power Meter | Power | | | -2 |
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Assorted power source and control circuits | Power | Mar 18, 2003 | | -1 |
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Build A Simple Rechargeable CMOS Battery | Power | | | -1 |
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Build A High Performance Voltage Regulator From Discrete Components | Power | | | -1 |
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12 Volt Gel Cell Charger circuit diagram | Power | | | -1 |
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Build A 10 Amp 13.8 Volt Power Supply | Power | | | 4 |
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Adjustable Voltage Regulator using a 7805 or other fixed linear voltage regulator instead on LM317 | Power | | | -1 |
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Using Pass Transistors Beef Up Voltage Regulator current output | Power | | | -2 |
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12 volt battery monitor circuit diagram | Power | Jan 26, 2001 | | -1 |
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12 volt power supply circuit diagram | Power | Jan 26, 2001 | | -1 |
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5 volt power supply circuit diagram | Power | Jan 26, 2001 | | 1 |
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Battery voltage monitor circuit diagram | Power | Jan 26, 2001 | | 0 |
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LM3914 battery monitor circuit diagram | Power | Jan 26, 2001 | | -2 |
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Multiple voltage power supply | Power | Jan 26, 2001 | | -3 |
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Voltage doubler using a 555 timer | Power | Jan 26, 2001 | | 0 |
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Voltage inverter using a 555 timer | Power | Jan 26, 2001 | | -2 |
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Simple switching regulator (experimental) | Power | Nov 16, 2002 | | -1 |
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Build a breadboard power module for integrated circuits | Power | Sep 30, 2009 | | -1 |
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DC to AC inverter using a 555 timer | Power | | | 1 |
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Dual (postive and negative) 12V power supply | Power | | | 2 |
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Current booster for 78nn series voltage regulators | Power | | | 0 |
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12V Lead-Acid Battery Monitor using LM3914 | Power | Jan 08, 2002 | | 0 |
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Charger for gel lead acid batteries | Power | Jan 26, 2001 | | 0 |
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Compressor-mate power protection for refrigerators, freezers and air conditioners | Power | Oct 06, 2006 | | 0 |
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High voltage DC generator | Power | | | 0 |
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High-Voltage Pulse Generator | Power | | | 1 |
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Automatic 9V NiCad battery charger | Power | | | 0 |
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Active Power Zener | Power | | | -1 |
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Solid state relay circuit | Power | | | -1 |
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NiCad Discharger for Tx & Rx Packs | Power | | | 1 |
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Lead acid battery charger with float | Power | | | 1 |
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Simple constant current source | Power | | | 0 |
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Nine Volt Battery Eliminator | Power | Sep 07, 2009 | | 1 |
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PWM DC Motor Speed Control | Power | Sep 21, 2006 | | 0 |
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12 Volt Battery Voltage Monitor (kit available) | Power | Jun 18, 2015 | | 1 |
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Battery Low Voltage Beeper | Power | Sep 21, 2006 | | 0 |
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12 Volt 15 Amp Low Voltage Disconnect (kit available) | Power | Jun 18, 2015 | | -1 |
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PWM Motor Speed Controller / DC Light Dimmer | Power | Jul 12, 2001 | | 0 |
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PWM Motor/Light Controller | Power | Jul 12, 2001 | | -1 |
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Low Power LED Voltmeter | Power | Jul 12, 2001 | | 1 |
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WGR1 - 12 Volt Wind Generator Regulator | Power | May 19, 2015 | | 0 |
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Expanded Scale Battery Volt Meter | Power | Sep 07, 2009 | | 0 |
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Temperature Controlled Nicad Charger | Power | Sep 21, 2006 | | -1 |
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12V, 4-AA Cell Differential Temperature Charger | Power | Aug 17, 2009 | | 0 |
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PWM Motor/Light Controller | Power | Jan 26, 2001 | | 0 |
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PWM Motor/Light Controller variants | Power | Jan 26, 2001 | | -1 |
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Low Power LED Voltmeter | Power | Jan 26, 2001 | | 0 |
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Temperature Controlled NICD Charger | Power | Jan 26, 2001 | | 0 |
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Battery Charger Ideas | Power | Aug 14, 2002 | | 0 |
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Windmill DIY Analog MPPT (maximum power point tracker) Circuit | Power | Mar 09, 2012 | | 0 |
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20 amp (peak) power supply for SSB transceivers | Power | Jun 24, 2015 | | 0 |
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Battery Characterizer | Power | Jul 24, 2002 | | 1 |
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Lead/acid battery charger | Power | | | 0 |
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200 Watt Modified PC Power Supply 13.5 Volt 14 Amp | Power | Jul 24, 2002 | | -1 |
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12V 30A power supply circuit diagram | Power | Jan 26, 2001 | | -1 |
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Dual regulated power supply | Power | Jan 26, 2001 | | -2 |
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Fuse blown indicator | Power | Jan 26, 2001 | | 1 |
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Gyrator circuit | Power | Jan 26, 2001 | | 0 |
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LM317 Regulator Circuit | Power | Nov 27, 2002 | | -2 |
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Nicad battery charger | Power | Jan 26, 2001 | | 0 |
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Unregulated power supply | Power | Jan 26, 2001 | | 0 |
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2A power supply - An adjustable power supply for model railways and general projects | Power | Jun 28, 2015 | | -1 |
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Broken Charger Connection Alarm Circuit | Power | Jul 15, 2015 | | 1 |
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Safety Guard - Simple unit, Protects home appliances from voltage spikes | Power | Jul 15, 2015 | | 0 |
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Running 12V Fan Directly on 220V AC | Power | Jul 30, 2015 | | 1 |
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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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Power Supply 13.8V/20A | Power | Sep 07, 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 Low Cost Thermal Peak Detection NiCd Charger | Power | Oct 15, 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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