15 Ampere Adjustable Power Supply

This adjustable power supply circuit provides an output voltage source which can be adjusted between 1.5 and 15 volts and give 15 amps current.15 A adjustable power supply
As is shown in the wiring diagram the 15 A adjustable power supply provides similar amount of current through the parallel work of four power transistors, which must be mounted on a good heatsink. The voltage adjustment is performed in integrated LM317, which also must be dissipated mechanically.

The transformer must have a primary according to the grid, while the secondary should provide 16 volts and 15 amps. Electrolytic capacitors should be mounted parallel to join together. The bridge rectifier should be at least 50 volts and 20 amps. It is recommend using a metal and mounted on the heatsink.

Output voltage is adjusted through a a linear potentiometer. The resistors connected to the emitters of the transistors must be at least 10 watts.

15 A adjustable power supply parts list :

Resistors :
0.47/10W (4)
270 ohm
10K linier potensiometer
Capacitors :
4700uF/40V (4)
Diodes :
Bridge rectifier at least 50V / 20A
Transistors :
2N3055 (4)
IC : LM317
Transformer : 16 V / 15 A



Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

Tags: 15 ampere adjustable power supply circuit adjustable power supply schematic high current power supply variable power supplies

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  1. author

    ahmad nazarpour4 years ago

    very thank you

  2. author

    Jamesgoodman4 years ago

    love your work. keep it up.

  3. author

    Richard Fletcher3 years ago

    I have built this and it do not work . I checked it all over took it all apart ro done it still not working can you describe the diagram better with emitter collector and base I dont know why it not working I tried them the other way around still not working ????

  4. author

    Richard Fletcher3 years ago

    Can anyone email me what I am doing wrong the multi metre shows 19.9v down to 4.6v but no current to run 6v 1.2a fan?? Richardfletcher128@yahoo.co.uk