Circuit Diagram

Power Fail Alert

Published:2012/11/26 1:06:00 Author:muriel | Keyword: Power Fail Alert

In this circuit an electricity supply (domestic or industrial) is continually monitored. Should the supply be interrupted then an alarm will sound for the duration of the interruption. It has battery backup and overcharge protection.   (View)

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12 Volt 20 Amp Power Supply

Published:2012/11/26 1:05:00 Author:muriel | Keyword: 12 Volt , 20 Amp, Power Supply

A 12 Volt high current 20 Amp power supply. The output voltage is variable from 12.2 Volt to 14.4V so can be set for any device requiring voltage and current in that range. This PSU uses an LM723 as the regulator, 4 parallel connected outboard pass transistors and has current limiting above 25 amps.   (View)

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Multiple Output DC Converter

Published:2012/11/26 1:04:00 Author:muriel | Keyword: Multiple, Output, DC Converter

A DC converter circuit taking one single DC input and converting to parallel multiple DC outputs.   (View)

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Adjustable Power Supply with Charger Output

Published:2012/11/26 1:04:00 Author:muriel | Keyword: Adjustable Power Supply , Charger Output

  (View)

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Fast Electronic Fuse

Published:2012/11/26 1:03:00 Author:muriel | Keyword: Fast , Electronic Fuse

A fast electronic fuse designed to operate on 230V AC with an adjustable trip current.   (View)

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Variable Power Supply Using Fixed Regulator

Published:2012/11/26 1:03:00 Author:muriel | Keyword: Variable Power Supply, Fixed Regulator

This is a similar power supply that I used to power my FM Transmitter. After suffering long problems with mains hum, this design using a pi filtered C-L-C approach. This circuit offers excellent ripple rejection.   (View)

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1.3V Power Supply

Published:2012/11/26 1:02:00 Author:muriel | Keyword: 1.3V , Power Supply

This is a replacement power source for 1.3V mercury cells or other small batteries. It has many uses and I use this circuit in my computer to power a front panel multi adapter which has a digital thermometer.   (View)

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Add-On Current Limiter for Power Supplies

Published:2012/11/26 0:59:00 Author:muriel | Keyword: Add-On, Current Limiter, Power Supplies

This circuit allows you to set a limit on the maximum output current available from your PSU. It's very useful when you power-up a project for the first time - or carry out a soak-test. By setting an upper limit on the current available from your PSU - you can protect both your power supply - and any device connected to it. It offers a simple and cheap alternative to the Current Limiting Power Supply.   (View)

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Universal PSU

Published:2012/11/26 0:59:00 Author:muriel | Keyword: Universal PSU

A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps.   (View)

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Soft Start PSU

Published:2012/11/26 0:58:00 Author:muriel | Keyword: Soft Start, PSU

Two soft start power supplies. The output voltage slowly increases to the desired output.   (View)

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Small Variable power Supply

Published:2012/11/26 0:58:00 Author:muriel | Keyword: Small Variable, power Supply

  (View)

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Supply Voltage Indicator

Published:2012/11/26 0:57:00 Author:muriel | Keyword: Supply Voltage Indicator

A novel supply voltage monitor which uses a LED to show the status of a power supply.   (View)

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Current Limiting Power Supply

Published:2012/11/26 0:56:00 Author:muriel | Keyword: Current Limiting, Power Supply

This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment.   (View)

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9 Volt 2 Amp PSU

Published:2012/11/26 0:56:00 Author:muriel | Keyword: 9 Volt , 2 Amp, PSU

A simple 9 Volt 2 amp supply using a single IC regulator.   (View)

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Regulated DC power supply

Published:2012/11/26 0:55:00 Author:muriel | Keyword: Regulated , DC, power supply

This is a Regulated DC power supply with short circuit protection and with current limiter.   (View)

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The Output Adjustable Flyback Converter

Published:2012/11/26 0:55:00 Author:muriel | Keyword: Output, Adjustable, Flyback Converter

A high voltage step-up DC power supply using adjustable flyback conversion.   (View)

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Alarm Power Supply

Published:2012/11/26 0:54:00 Author:muriel | Keyword: Alarm Power Supply

A 12 Volt power suppiled designed for Ron's Modular Burglar Alarm. However, being a popular supply voltage this circuit will have many other uses as well.   (View)

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Overvoltage Protection for the LM317

Published:2012/11/26 0:53:00 Author:muriel | Keyword: Overvoltage Protection, LM317

This is an add-on Over Voltage Circuit for the LM317 Regulator Circuit submitted by Matthew Hewson.   (View)

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Basic UPS

Published:2012/11/26 0:52:00 Author:muriel | Keyword: Basic UPS

This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of electrical supply line failure the battery takes over, with no spikes on the regulated supply.   (View)

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LM317 Voltage Regulator

Published:2012/11/26 0:51:00 Author:muriel | Keyword: LM317 , Voltage Regulator

I constructed this voltage regulator to power my two way mobile radio from the car cigarette lighter circuit. It has many other uses and the voltage can easily be adjusted by the use of a potentiometer. The voltage regulator is an LM317T, and should accept up to about 14 volts without problems. It can handle up to 1 amp, but you WILL need a heatsink on the voltage regulator.   (View)

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