There are 163 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Sunday, 24 July 2016.Please note some adblockers will suppress the schematics as well as the advertisement so please disable if the schematic list is empty.

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CircuitCategoryDate AddedOK?Votes 
13.8V 30-40A Power Supply (PDF)Power Status5 vote up vote down
Car Ignition Coil Driver from 110V ACPowerSep 23, 2009Status0 vote up vote down
Amplified zener regulatorPower Status-1 vote up vote down
Car Ignition Coil Driver from 12V DC - Can be used as an electric fencePowerSep 23, 2009Status1 vote up vote down
Battery Charger, Current and Voltage Regulated for Sealed Lead Acid batteriesPower Status-2 vote up vote down
Voltage and current regulated power supplyPowerSep 23, 2009Status1 vote up vote down
Simple switching power supply (mains operated)PowerSep 23, 2009Status1 vote up vote down
12 Volt Switching Power Supply circuit diagram and PCB layoutPowerSep 23, 2009Status2 vote up vote down
Simple voltage booster based on Linear Technologies LT1372, includes PCB designPowerSep 23, 2009Status1 vote up vote down
Alkaline battery chargerPowerDec 02, 2002Status-1 vote up vote down
Highly accurate constant current source using LM4140, OP777 and MOSFETPowerMar 17, 2014Status0 vote up vote down
Dry cell battery chargerPowerDec 07, 2014Status1 vote up vote down
Power Supply Resumption Alarm using 555 timerPowerOct 25, 2014Status-1 vote up vote down
Solid-state voltage indicator with high voltage cutoutPowerDec 07, 2014Status-1 vote up vote down
Stabilized Power Supply With Short-Circuit IndicationPowerOct 25, 2014Status-1 vote up vote down
Capacitor voltage stepper using 555 timerPowerDec 07, 2014Status0 vote up vote down
Low Voltage Alarm for batteries and other volatile DC power sourcesPowerJun 26, 2009Status0 vote up vote down
Voltage Monitor using UA741 operational amplifierPowerOct 19, 2009Status0 vote up vote down
Expanded Scale Battery Volt MeterPowerSep 17, 2009Status1 vote up vote down
Battery Low Voltage BeeperPowerSep 17, 2009Status1 vote up vote down
Low Cost Universal Battery ChargerPowerJan 08, 2014Status0 vote up vote down
26V-to-5000V DC-DC ConverterPowerJan 08, 2014Status0 vote up vote down
Fast Charger for Better Lead-Acid Battery LifePowerOct 03, 2013Status1 vote up vote down
5 A Constant Voltage-Constant Current RegulatorPowerOct 03, 2013Status0 vote up vote down
1A Variable Regulated Power SupplyPower Status1 vote up vote down
Regulated Power Supply CircuitsPowerSep 10, 2006Status0 vote up vote down
Basic Solid State RelaysPowerSep 10, 2006Status-1 vote up vote down
LM311 Thermostat circuit diagramsPower Status0 vote up vote down
Transformer Secondary Voltage ReductionPower Status0 vote up vote down
Back And Forth - Bidirectional Bipolar Stepper Motor DriverPower Status1 vote up vote down
High Side Current Monitors (LM358, Zetex - ZXCT-1009)PowerSep 10, 2006Status1 vote up vote down
Low Battery Voltage Cutout CircuitsPowerSep 10, 2006Status0 vote up vote down
Preselect Twin Coil Switch Machine CircuitPower Status0 vote up vote down
N.O. Magnetic Reed Switch ON /OFF Circuit (SCR equivalent)Power Status0 vote up vote down
Team digital - SCR16 - Twin Coil Switch Machine AdapterPower Status0 vote up vote down
Efficient unipolar stepper motor driver (only uses power when it makes a step)Power Status0 vote up vote down
Alternative power source for Magellan GPS receiversPowerMay 01, 2004Status0 vote up vote down
Battery voltage monitor using an LM358 op-ampPowerApr 12, 2014Status1 vote up vote down
0-14 volt, 0-2 amp current limited variable power supply regulatorPower Status0 vote up vote down
A Variable power supply with adjustable current limiting. 0-14V output up to 5A current.PowerApr 12, 2014Status0 vote up vote down
Dynamo Current and Voltage RegulatorPowerSep 21, 2006Status-1 vote up vote down
General purpose portable DC power supply using rechargeable C cellsPowerFeb 05, 2010Status0 vote up vote down
Bench power supply that allows a number of varying output voltages to be preset. Includes PCB layoutPowerFeb 26, 2010Status0 vote up vote down
Power supply metering circuits for measuring both voltage and currentPowerFeb 09, 2010Status0 vote up vote down
Emergency power systemPowerMay 16, 2010Status0 vote up vote down
Digital bench power supply based on a PIC16F870PowerMay 24, 2010Status0 vote up vote down
Lithium Ion Battery Charger based on a PIC micro including circuit diagram and source codePowerMay 24, 2010Status0 vote up vote down
6V to 12V ConverterPower Status0 vote up vote down
Automatic 12V Lead Acid Battery ChargerPowerSep 01, 2009Status0 vote up vote down
Solid State Tesla Coil/High Voltage GeneratorPowerSep 01, 2009Status0 vote up vote down
12V to 120V Inverter circuit diagramPowerSep 01, 2009Status0 vote up vote down
Basic Power SupplyPowerSep 01, 2009Status1 vote up vote down
High Current Power SupplyPowerSep 01, 2009Status0 vote up vote down
Dual Polarity Power SupplyPowerSep 01, 2009Status0 vote up vote down
High Voltage High Current Power SupplyPowerSep 01, 2009Status0 vote up vote down
Transformerless Power SupplyPowerSep 01, 2009Status0 vote up vote down
Fixed Voltage Power SupplyPowerSep 01, 2009Status-1 vote up vote down
Voltage Inverter using 555 TimerPowerSep 01, 2009Status0 vote up vote down
Voltage Inverter using LM380 audio amplifier ICPowerSep 01, 2009Status-1 vote up vote down
Dual power supplyPowerJan 31, 2003Status0 vote up vote down
Negative voltage generatorPowerAug 12, 2001Status0 vote up vote down
Power reminder beeper (PDF)PowerJan 26, 2001Status0 vote up vote down
Unplugged power cord alarmPowerJan 26, 2001Status0 vote up vote down
Machine power loss beepter (PDF)PowerJan 26, 2001Status0 vote up vote down
Simple NiCad battery charger using LM317PowerAug 17, 2009Status0 vote up vote down
Op-Amp Current Source with Floating Load including SPICE simulationPowerMar 26, 2011Status0 vote up vote down
HV supply: 12VDC in, 12KV outPowerJan 26, 2001Status1 vote up vote down
Generating -5VDC from +5VDCPowerJan 26, 2001Status1 vote up vote down
Filtering PC bus POWERPowerJan 26, 2001Status0 vote up vote down
Dual Polarity Unregulated PSU For High-End Audio AmpsPowerNov 13, 2010Status0 vote up vote down
High Voltage Converter: 90V From 1.5VPowerNov 13, 2010Status0 vote up vote down
Charge Monitor for 12V lead acid batteryPower Status0 vote up vote down
NiCd Cell ChargerPower Status0 vote up vote down
Basic UPS Power SupplyPowerFeb 21, 2005Status1 vote up vote down
Fuse monitor / alarmPowerFeb 21, 2005Status0 vote up vote down
Voltage monitor with LED indicatorPowerFeb 21, 2005Status0 vote up vote down
High current regulated power supplyPowerOct 31, 2002Status0 vote up vote down
Adjustable power supply using LM317PowerJan 26, 2001Status0 vote up vote down
Simple +5V power supply circuitPowerJan 26, 2001Status1 vote up vote down
Basic 78xx series regulator mains power supply circuit diagramPowerOct 25, 2009Status0 vote up vote down
USB charger circuit diagramPowerAug 18, 2009Status0 vote up vote down
Advanced High Voltage PSU circuitPower Status0 vote up vote down
12 Vdc - 120 Vac Inverter SchematicPowerJan 01, 2003Status0 vote up vote down
Single to 3-phase power conversionPower Status1 vote up vote down
Breadboard supply - very low dropout adjustable power supplyPowerOct 12, 2009Status0 vote up vote down
Small battery-powered USB charger including circuit diagram and PCB layoutPowerOct 12, 2009Status1 vote up vote down
3.3V / 5V Regulated Power Supply CircuitPowerJul 03, 2011Status0 vote up vote down
Lead-Acid Battery MonitorPower Status0 vote up vote down
Simple switching power supplyPowerJul 10, 2002Status0 vote up vote down
AC Power MeterPower Status0 vote up vote down
Assorted power source and control circuitsPowerMar 18, 2003Status0 vote up vote down
Build A Simple Rechargeable CMOS BatteryPower Status0 vote up vote down
Build A High Performance Voltage Regulator From Discrete ComponentsPower Status0 vote up vote down
12 Volt Gel Cell Charger circuit diagramPower Status0 vote up vote down
Build A 10 Amp 13.8 Volt Power SupplyPower Status1 vote up vote down
Adjustable Voltage Regulator using a 7805 or other fixed linear voltage regulator instead on LM317Power Status0 vote up vote down
Using Pass Transistors Beef Up Voltage Regulator current outputPower Status0 vote up vote down
12 volt battery monitor circuit diagramPowerJan 26, 2001Status0 vote up vote down
12 volt power supply circuit diagramPowerJan 26, 2001Status0 vote up vote down
5 volt power supply circuit diagramPowerJan 26, 2001Status0 vote up vote down
Battery voltage monitor circuit diagramPowerJan 26, 2001Status1 vote up vote down
LM3914 battery monitor circuit diagramPowerJan 26, 2001Status0 vote up vote down
Multiple voltage power supplyPowerJan 26, 2001Status-1 vote up vote down
Voltage doubler using a 555 timerPowerJan 26, 2001Status1 vote up vote down
Voltage inverter using a 555 timerPowerJan 26, 2001Status0 vote up vote down
Simple switching regulator (experimental)PowerNov 16, 2002Status0 vote up vote down
Build a breadboard power module for integrated circuitsPowerSep 30, 2009Status0 vote up vote down
DC to AC inverter using a 555 timerPower Status0 vote up vote down
Dual (postive and negative) 12V power supplyPower Status1 vote up vote down
Current booster for 78nn series voltage regulatorsPower Status0 vote up vote down
12V Lead-Acid Battery Monitor using LM3914PowerJan 08, 2002Status0 vote up vote down
Charger for gel lead acid batteriesPowerJan 26, 2001Status0 vote up vote down
Compressor-mate power protection for refrigerators, freezers and air conditionersPowerOct 06, 2006Status0 vote up vote down
High voltage DC generatorPower Status0 vote up vote down
High-Voltage Pulse GeneratorPower Status0 vote up vote down
Automatic 9V NiCad battery chargerPower Status0 vote up vote down
Active Power ZenerPower Status0 vote up vote down
Solid state relay circuitPower Status0 vote up vote down
NiCad Discharger for Tx & Rx PacksPower Status0 vote up vote down
Lead acid battery charger with floatPower Status0 vote up vote down
Simple constant current sourcePower Status0 vote up vote down
Power Supply for Vacuum Tube ExperimentsPowerMay 19, 2015Status0 vote up vote down
Nine Volt Battery EliminatorPowerSep 07, 2009Status0 vote up vote down
PWM DC Motor Speed ControlPowerSep 21, 2006Status0 vote up vote down
12 Volt Battery Voltage Monitor (kit available)PowerJun 18, 2015Status0 vote up vote down
Battery Low Voltage BeeperPowerSep 21, 2006Status0 vote up vote down
12 Volt 15 Amp Low Voltage Disconnect (kit available)PowerJun 18, 2015Status0 vote up vote down
PWM Motor Speed Controller / DC Light DimmerPowerJul 12, 2001Status0 vote up vote down
PWM Motor/Light ControllerPowerJul 12, 2001Status0 vote up vote down
Low Power LED VoltmeterPowerJul 12, 2001Status0 vote up vote down
WGR1 - 12 Volt Wind Generator RegulatorPowerMay 19, 2015Status0 vote up vote down
Expanded Scale Battery Volt MeterPowerSep 07, 2009Status0 vote up vote down
Temperature Controlled Nicad ChargerPowerSep 21, 2006Status-1 vote up vote down
12V, 4-AA Cell Differential Temperature ChargerPowerAug 17, 2009Status0 vote up vote down
PWM Motor/Light ControllerPowerJan 26, 2001Status0 vote up vote down
PWM Motor/Light Controller variantsPowerJan 26, 2001Status0 vote up vote down
Low Power LED VoltmeterPowerJan 26, 2001Status0 vote up vote down
Temperature Controlled NICD ChargerPowerJan 26, 2001Status0 vote up vote down
Battery Charger IdeasPowerAug 14, 2002Status0 vote up vote down
Windmill DIY Analog MPPT (maximum power point tracker) CircuitPowerMar 09, 2012Status0 vote up vote down
20 amp (peak) power supply for SSB transceiversPowerJun 24, 2015Status0 vote up vote down
Battery CharacterizerPowerJul 24, 2002Status0 vote up vote down
Lead/acid battery chargerPower Status0 vote up vote down
200 Watt Modified PC Power Supply 13.5 Volt 14 AmpPowerJul 24, 2002Status-1 vote up vote down
12V 30A power supply circuit diagramPowerJan 26, 2001Status0 vote up vote down
Dual regulated power supplyPowerJan 26, 2001Status0 vote up vote down
Fuse blown indicatorPowerJan 26, 2001Status0 vote up vote down
Gyrator circuitPowerJan 26, 2001Status0 vote up vote down
LM317 Regulator CircuitPowerNov 27, 2002Status-1 vote up vote down
Nicad battery chargerPowerJan 26, 2001Status0 vote up vote down
Unregulated power supplyPowerJan 26, 2001Status0 vote up vote down
2A power supply - An adjustable power supply for model railways and general projectsPowerJun 28, 2015Status0 vote up vote down
Broken Charger Connection Alarm CircuitPowerJul 15, 2015Status0 vote up vote down
Safety Guard - Simple unit, Protects home appliances from voltage spikesPowerJul 15, 2015Status0 vote up vote down
Running 12V Fan Directly on 220V ACPowerJul 30, 2015Status0 vote up vote down
High Voltage Power Supply step-up converter using a MC34063 ideal for a geiger counter or nixie tubePowerJul 03, 2016Status0 vote up vote down
Low Voltage Power Supply / step down using a MC34063PowerJul 03, 2016Status0 vote up vote down
A small power supply for universal use based on an LM317 adjustable regulatorPowerJul 03, 2016Status0 vote up vote down
Linear regulated bench power supply 20V, 2A - easy to upgradePowerJul 03, 2016Status0 vote up vote down
Bench power supply with buck converter with a linear afterburnerPowerJul 03, 2016Status0 vote up vote down
Small 2.5 - 50V power supply for universal use based on a LT1074PowerJul 03, 2016Status0 vote up vote down
Linear Power Supply 8 .. 16 V ~ 10A that offers low noisePowerJul 03, 2016Status-1 vote up vote down
Artificial ground to transform an Unipolar Power Supply into a Bipolar Power SupplyPowerJul 03, 2016Status0 vote up vote down