Variable Power Supply Using LM317 Voltage Regulator

Circuit Diagram

Parts Required

Diodes:

D1 & D2 – IN4007

Resistors: (All 1/4 Watts)

R1 – 2.2K

R2 – 240E

R3 – 4.7K (Preset or Pot)

Capacitor:

C1 – 100nF (poly)

C2 – 100nF (Poly)

C3 – 100uF (25V)

For rectification, we can use four diodes or a bridge rectifier: DB107 or W10

L1 – Red LED 5mm

IC:

LM317

Miscellaneous:

Terminal Connectors – 2 ( 2pin)

General PCB