@▷ Power Supply Circuit using LM 317 | Diagram for Schematic

Power Supply Circuit using LM 317

Power Supply Circuit-40 Volts-2A


This is a power supply circuit diagram of 40Volts, that is able to deliver 2A current.This circuit is suitable for power amplifiers .Transistor TIP 42 A is used as a pass transistor to increase the current capabilities.Voltage regulator LM 317 is the heart of this circuit .Here the out put voltage is set to 40 V by R5 & R8.If you want any other out put voltage use a 10 K pot instead of R5 and adjust it.

Parts List.

R1_______________3R9 1 or 2W Resistor
R2______________ 22R 1/4W Resistor
R3_______________6K8 1/4W Resistor
R4_____________ 220R 1/4W Resistor
R5_______________4K7 1/2W Resistor

C1____________ 3300F 50V Electrolytic Capacitor (or 4700F 50V)
C2,C5__________ 100nF 63V Polyester Capacitors
C3______________ 10F 63V Electrolytic Capacitor
C4_____________ 220F 50V Electrolytic Capacitor

D1_____ Diode bridge 4A
D2___________ 1N4002 Diode
D3______________ LED Any color
U1___________ LM317
Q1____________ TIP42A Transistor
T1_____________ 230V Primary, 40V 2A ,Secondary,
Mains transformer.

If diode bridge is not available make one using four 1N 4007 Diodes.

Power Supply Circuit Diagram.

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