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.
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.
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 :
10K linier potensiometer
Bridge rectifier at least 50V / 20A
IC : LM317
Transformer : 16 V / 15 A