Powersupply circuits for everyone & Most applications

• +9V *and* -9V from one battery
• 0-14 volt, 0-2 amp current limited variable power supply regulator
• 12 Vdc - 120 Vac Inverter Schematic
• 12 volt battery monitor
• 12 Volt Gel Cell Charger
• 12 volt power supply
• 12 Volt Switching Power Supply circuit diagram and PCB layout
• 12V 30A power supply
• 12V Lead-Acid Battery Monitor using LM3914
• 12V to 120V Inverter
• 12V, 4-AA Cell Differential Temperature Charger
• 13.8V 30-40A Power Supply (PDF)
• 1A Variable Regulated Power Supply
• 200 Watt Modified PC Power Supply 13.5 Volt 14 Amp
• 3rd harmonic distortion meter for measuring the quality of AC supply
• 5 volt power supply
• 500W low cost 12V to 220V inverter
• 6V to 12V Converter
• 6V to 12V Converter
• AC Power Meter
• Active Power Zener
• Adjustable power supply using LM317
• Adjustable Voltage Regulator using a 7805 or other fixed linear voltage regulator instead on LM317
• Advanced High Voltage PSU circuit
• Alkaline battery charger
• Alternative power source for Magellan GPS receivers
• Amplified zener regulator
• Assorted power source and control circuits
• Automatic 12V Lead Acid Battery Charger
• Automatic 9V NiCad battery charger
• Back And Forth - Bidirectional Bipolar Stepper Motor Driver
• Basic 78xx series regulator mains power supply circuit diagram
• Basic Power Supply
• Basic Solid State Relays
• Basic UPS Power Supply
• Battery Characterizer
• Battery charge for 12V SLA batteries
• Battery Charger Ideas
• Battery Charger, Current and Voltage Regulated for Sealed Lead Acid batteries
• Battery Low Voltage Beeper
• Battery Low Voltage Beeper
• Battery voltage monitor
• Bench power supply
• Bench power supply that allows a number of varying output voltages to be preset. Includes PCB layout
• Breadboard supply - very low dropout adjustable power supply
• Build A 10 Amp 13.8 Volt Power Supply
• Build a breadboard power module for integrated circuits
• Build A High Performance Voltage Regulator From Discrete Components
• Build A Simple Rechargeable CMOS Battery
• Car Ignition Coil Driver from 110V AC
• Car Ignition Coil Driver from 12V DC - Can be used as an electric fence
• Charge Monitor for 12V lead acid battery
• Charger for gel lead acid batteries
• Cockcroft-Walton voltage multipliers (PDF)
• Compressor-mate power protection for refrigerators, freezers and air conditioners
• Controller for hybrid (photovoltaic- wind turbine and diesel engine) power plant
• Current booster for 78nn series voltage regulators
• DC to AC inverter using a 555 timer
• DC Voltage and Current Source
• Dual (postive and negative) 12V power supply
• Dual Polarity Power Supply
• Dual Polarity Power Supply
• Dual power supply
• Dual regulated power supply
• Dynamo Current and Voltage Regulator
• Easy power supply
• Efficient unipolar stepper motor driver (only uses power when it makes a step)
• Expanded Scale Battery Volt Meter
• Expanded Scale Battery Volt Meter
• Fast NiMH / NiCd Battery charger
• Filtering PC bus POWER
• Fixed Voltage Power Supply
• Fixed Voltage Power Supply
• Flyback transformer driver
• Fuse blown indicator
• Fuse monitor / alarm
• General purpose portable DC power supply using rechargeable C cells
• Generating -5VDC from +5VDC
• Gyrator circuit
• High Current Power Supply
• High Current Power Supply
• High current regulated power supply
• High Side Current Monitors (LM358, Zetex - ZXCT-1009)
• High voltage DC generator
• High Voltage High Current Power Supply
• High Voltage High Current Power Supply
• High-Voltage Pulse Generator
• HV supply: 12VDC in, 12KV out
• Inverter, 12 volt unit, MOSFET design
• Inverter, A 12 volt unit, Very Basic type
• Lead acid battery charger with float
• Lead/acid battery charger
• Lead-Acid Battery Monitor
• LED battery voltage monitor. A fuel gage for your gel cell battery.
• Lithium Battery Rejuvinator
• LM311 Thermostat circuit diagrams
• LM317 Regulator Circuit
• LM3914 battery monitor
• Low Battery Voltage Cutout Circuits
• Low Power LED Voltmeter
• Low Power LED Voltmeter
• Low Voltage Alarm for batteries and other volatile DC power sources
• Low-dropout 12V regulator (LM324)
• Machine power loss beepter (PDF)
• Multiple voltage power supply
• N.O. Magnetic Reed Switch ON /OFF Circuit (SCR equivalent)
• Nagative voltage generation using 555 timer
• Negative Supply from single positive Supply using 555 timer
• Negative voltage generator
• Nicad battery charger
• Nicad battery charger
• NiCad Discharger for Tx & Rx Packs
• NiCd Cell Charger
• Nine Volt Battery Eliminator
• One 9V battery gives +18, +25, +33V
• Power reminder beeper (PDF)
• Power supply metering circuits for measuring both voltage and current
• Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
• Preselect Twin Coil Switch Machine Circuit
• Pulse Charger for reviving tired Lead Acid batteries
• PWM DC Motor Speed Control
• PWM Motor Speed Controller / DC Light Dimmer
• PWM Motor/Light Controller
• PWM Motor/Light Controller
• PWM Motor/Light Controller variants
• Regulated 12V supply
• Regulated Power Supply Circuits
• Simple +5V power supply circuit
• Simple Capacitance Multiplier Power Supply For Class-A Amplifiers
• Simple constant current source
• Simple DC Adapter Power Supply
• Simple NiCad battery charger using LM317
• Simple power supply
• Simple switching power supply
• Simple switching power supply (mains operated)
• Simple switching regulator (experimental)
• Simple voltage booster based on Linear Technologies LT1372, includes PCB design
• Single to 3-phase power conversion
• Small battery-powered USB charger including circuit diagram and PCB layout
• Snowmobile GPS power adapter
• Solid state relay circuit
• Solid State Tesla Coil/High Voltage Generator
• Team digital - SCR16 - Twin Coil Switch Machine Adapter
• Temperature Controlled Nicad Charger
• Temperature Controlled NICD Charger
• Tesla coil / HV generator
• Transformer Secondary Voltage Reduction
• Transformerless Power Supply
• Transformerless Power Supply
• TTL power supply with crowbar protection
• Turn an ordinary wall wart / plug-pack into a regulated device
• Unplugged power cord alarm
• Unregulated power supply
• USB charger
• Using Pass Transistors Beef Up Voltage Regulator current output
• Valve power supply
• Variable Dual Lab Power Supply
• Variable power supply
• Voltage and current regulated power supply
• Voltage converter
• Voltage doubler
• Voltage Inverter
• Voltage Inverter
• Voltage inverter
• Voltage Inverter using 555 Timer
• Voltage Inverter using LM380 audio amplifier IC
• Voltage Monitor using UA741 operational amplifier
• Voltage monitor with LED indicator