There are 167 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 
13.8V 30-40A Power Supply (PDF)Power 2
DC Voltage and Current SourcePowerMar 25, 20092
Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VACPowerJan 26, 20011
Controller for hybrid (photovoltaic- wind turbine and diesel engine) power plantPowerMar 25, 20090
3rd harmonic distortion meter for measuring the quality of AC supplyPowerMar 25, 20090
Car Ignition Coil Driver from 110V ACPowerSep 23, 20090
Amplified zener regulatorPower -1
Car Ignition Coil Driver from 12V DC - Can be used as an electric fencePowerSep 23, 20091
Battery Charger, Current and Voltage Regulated for Sealed Lead Acid batteriesPower 0
Voltage and current regulated power supplyPowerSep 23, 2009-1
Simple switching power supply (mains operated)PowerSep 23, 20090
12 Volt Switching Power Supply circuit diagram and PCB layoutPowerSep 23, 20092
Simple voltage booster based on Linear Technologies LT1372, includes PCB designPowerSep 23, 20090
Alkaline battery chargerPowerDec 02, 20020
Highly accurate constant current source using LM4140, OP777 and MOSFETPowerMar 17, 20140
Dry cell battery chargerPowerDec 07, 20140
Power Supply Resumption Alarm using 555 timerPowerOct 25, 2014-1
Solid-state voltage indicator with high voltage cutoutPowerDec 07, 2014-1
Stabilized Power Supply With Short-Circuit IndicationPowerOct 25, 20140
Capacitor voltage stepper using 555 timerPowerDec 07, 20140
Low Voltage Alarm for batteries and other volatile DC power sourcesPowerJun 26, 20090
Voltage Monitor using UA741 operational amplifierPowerOct 19, 20090
Expanded Scale Battery Volt MeterPowerSep 17, 20090
Battery Low Voltage BeeperPowerSep 17, 20090
Low Cost Universal Battery ChargerPowerJan 08, 20140
26V-to-5000V DC-DC ConverterPowerJan 08, 20140
Fast Charger for Better Lead-Acid Battery LifePowerOct 03, 20130
5 A Constant Voltage-Constant Current RegulatorPowerOct 03, 20130
1A Variable Regulated Power SupplyPower 0
Regulated Power Supply CircuitsPowerSep 10, 20060
Basic Solid State RelaysPowerSep 10, 20060
LM311 Thermostat circuit diagramsPower 0
Transformer Secondary Voltage ReductionPower 0
Back And Forth - Bidirectional Bipolar Stepper Motor DriverPower 0
High Side Current Monitors (LM358, Zetex - ZXCT-1009)PowerSep 10, 20060
Low Battery Voltage Cutout CircuitsPowerSep 10, 20060
Preselect Twin Coil Switch Machine CircuitPower 0
N.O. Magnetic Reed Switch ON /OFF Circuit (SCR equivalent)Power 0
Team digital - SCR16 - Twin Coil Switch Machine AdapterPower 0
Efficient unipolar stepper motor driver (only uses power when it makes a step)Power 0
Alternative power source for Magellan GPS receiversPowerMay 01, 20040
Battery voltage monitor using an LM358 op-ampPowerApr 12, 20140
0-14 volt, 0-2 amp current limited variable power supply regulatorPower 0
A Variable power supply with adjustable current limiting. 0-14V output up to 5A current.PowerApr 12, 20140
Dynamo Current and Voltage RegulatorPowerSep 21, 20060
General purpose portable DC power supply using rechargeable C cellsPowerFeb 05, 20100
Bench power supply that allows a number of varying output voltages to be preset. Includes PCB layoutPowerFeb 26, 20100
Power supply metering circuits for measuring both voltage and currentPowerFeb 09, 20100
Emergency power systemPowerMay 16, 20100
Digital bench power supply based on a PIC16F870PowerMay 24, 20100
Lithium Ion Battery Charger based on a PIC micro including circuit diagram and source codePowerMay 24, 20100
6V to 12V ConverterPower 0
Automatic 12V Lead Acid Battery ChargerPowerSep 01, 20090
Solid State Tesla Coil/High Voltage GeneratorPowerSep 01, 20090
12V to 120V Inverter circuit diagramPowerSep 01, 20090
Basic Power SupplyPowerSep 01, 20090
High Current Power SupplyPowerSep 01, 20090
Dual Polarity Power SupplyPowerSep 01, 20090
High Voltage High Current Power SupplyPowerSep 01, 20090
Transformerless Power SupplyPowerSep 01, 20090
Fixed Voltage Power SupplyPowerSep 01, 20090
Voltage Inverter using 555 TimerPowerSep 01, 20090
Voltage Inverter using LM380 audio amplifier ICPowerSep 01, 2009-1
Dual power supplyPowerJan 31, 20030
Negative voltage generatorPowerAug 12, 20010
Power reminder beeper (PDF)PowerJan 26, 20010
Unplugged power cord alarmPowerJan 26, 20010
Machine power loss beepter (PDF)PowerJan 26, 20010
Simple NiCad battery charger using LM317PowerAug 17, 20090
Op-Amp Current Source with Floating Load including SPICE simulationPowerMar 26, 20110
HV supply: 12VDC in, 12KV outPowerJan 26, 20010
Generating -5VDC from +5VDCPowerJan 26, 20010
Filtering PC bus POWERPowerJan 26, 20010
Dual Polarity Unregulated PSU For High-End Audio AmpsPowerNov 13, 20100
High Voltage Converter: 90V From 1.5VPowerNov 13, 20100
Charge Monitor for 12V lead acid batteryPower 0
NiCd Cell ChargerPower 0
Basic UPS Power SupplyPowerFeb 21, 20051
Fuse monitor / alarmPowerFeb 21, 20050
Voltage monitor with LED indicatorPowerFeb 21, 20050
High current regulated power supplyPowerOct 31, 20020
Adjustable power supply using LM317PowerJan 26, 20010
Simple +5V power supply circuitPowerJan 26, 20010
One 9V battery gives +18, +25, +33VPowerJul 24, 20020
+9V *and* -9V from one batteryPowerJul 24, 20020
Basic 78xx series regulator mains power supply circuit diagramPowerOct 25, 20090
USB charger circuit diagramPowerAug 18, 20090
Advanced High Voltage PSU circuitPower 0
12 Vdc - 120 Vac Inverter SchematicPowerJan 01, 20030
Single to 3-phase power conversionPower 0
DC Voltage and Current SourcePowerMay 19, 20150
Student DC power supplyPowerJun 19, 20110
Circuit that provides a short circuit protected power supply from PC 12V supply voltage.PowerMay 19, 20150
+/-5A Voltage Controlled Current SourcePowerMay 19, 20150
Breadboard supply - very low dropout adjustable power supplyPowerOct 12, 20090
Small battery-powered USB charger including circuit diagram and PCB layoutPowerOct 12, 20091
3.3V / 5V Regulated Power Supply CircuitPowerJul 03, 20110
Lead-Acid Battery MonitorPower 0
Simple switching power supplyPowerJul 10, 20020
AC Power MeterPower 0
Assorted power source and control circuitsPowerMar 18, 20030
Build A Simple Rechargeable CMOS BatteryPower 0
Build A High Performance Voltage Regulator From Discrete ComponentsPower 0
12 Volt Gel Cell Charger circuit diagramPower 0
Build A 10 Amp 13.8 Volt Power SupplyPower 0
Adjustable Voltage Regulator using a 7805 or other fixed linear voltage regulator instead on LM317Power 0
Using Pass Transistors Beef Up Voltage Regulator current outputPower 0
12 volt battery monitor circuit diagramPowerJan 26, 20010
12 volt power supply circuit diagramPowerJan 26, 20010
5 volt power supply circuit diagramPowerJan 26, 20010
Battery voltage monitor circuit diagramPowerJan 26, 20010
LM3914 battery monitor circuit diagramPowerJan 26, 20010
Multiple voltage power supplyPowerJan 26, 20010
Voltage doubler using a 555 timerPowerJan 26, 20010
Voltage inverter using a 555 timerPowerJan 26, 20010
Simple switching regulator (experimental)PowerNov 16, 20020
Build a breadboard power module for integrated circuitsPowerSep 30, 20090
DC to AC inverter using a 555 timerPower 0
Dual (postive and negative) 12V power supplyPower 1
Current booster for 78nn series voltage regulatorsPower 0
12V Lead-Acid Battery Monitor using LM3914PowerJan 08, 20020
Charger for gel lead acid batteriesPowerJan 26, 20010
Compressor-mate power protection for refrigerators, freezers and air conditionersPowerOct 06, 20060
High voltage DC generatorPower 0
High-Voltage Pulse GeneratorPower 0
Automatic 9V NiCad battery chargerPower 0
Active Power ZenerPower 0
Solid state relay circuitPower 0
NiCad Discharger for Tx & Rx PacksPower 0
Lead acid battery charger with floatPower 0
Simple constant current sourcePower 0
Power Supply for Vacuum Tube ExperimentsPowerMay 19, 20150
Nine Volt Battery EliminatorPowerSep 07, 20090
PWM DC Motor Speed ControlPowerSep 21, 20060
12 Volt Battery Voltage Monitor (kit available)PowerJun 18, 20150
Battery Low Voltage BeeperPowerSep 21, 20060
12 Volt 15 Amp Low Voltage Disconnect (kit available)PowerJun 18, 20150
PWM Motor Speed Controller / DC Light DimmerPowerJul 12, 20010
PWM Motor/Light ControllerPowerJul 12, 20010
Low Power LED VoltmeterPowerJul 12, 20010
WGR1 - 12 Volt Wind Generator RegulatorPowerMay 19, 20150
Expanded Scale Battery Volt MeterPowerSep 07, 20090
Temperature Controlled Nicad ChargerPowerSep 21, 20060
12V, 4-AA Cell Differential Temperature ChargerPowerAug 17, 20090
PWM Motor/Light ControllerPowerJan 26, 20010
PWM Motor/Light Controller variantsPowerJan 26, 20010
Low Power LED VoltmeterPowerJan 26, 20010
Temperature Controlled NICD ChargerPowerJan 26, 20010
Battery Charger IdeasPowerAug 14, 20020
Windmill DIY Analog MPPT (maximum power point tracker) CircuitPowerMar 09, 20120
20 amp (peak) power supply for SSB transceiversPowerJun 24, 20150
Battery CharacterizerPowerJul 24, 20020
Lead/acid battery chargerPower 0
200 Watt Modified PC Power Supply 13.5 Volt 14 AmpPowerJul 24, 20020
12V 30A power supply circuit diagramPowerJan 26, 20010
Dual regulated power supplyPowerJan 26, 20010
Fuse blown indicatorPowerJan 26, 20010
Gyrator circuitPowerJan 26, 20010
Variable power supplyPowerJan 26, 20010
LM317 Regulator CircuitPowerNov 27, 20020
Nicad battery chargerPowerJan 26, 20010
Regulated 12V supplyPowerJan 26, 20010
Unregulated power supplyPowerJan 26, 20010
2A power supply - An adjustable power supply for model railways and general projectsPowerJun 28, 20150
Broken Charger Connection Alarm CircuitPowerJul 15, 20150
Safety Guard - Simple unit, Protects home appliances from voltage spikesPowerJul 15, 20150
Running 12V Fan Directly on 220V ACPowerJul 30, 20150