Dual Power Supply

Description:

This schematics is of dual power supply, having voltage output 3,5,6,9,12,15 and -3,-5,-6,-9,-12,-15. LM 317 is adjustable 3-terminal positive voltage regulator and LM 337 is adjustable 3-terminal negative voltage regulator.

Switch S1 is for +ve and S2 is for -ve voltage respectively.

Schematic:

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Pin out:

Components:

All diodes are 1N4007

R1, R3 270 ohm

R2 1K2 ohm

R4, R10 390 ohm

R5, R11 820 ohm

R6, R12 1K ohm

R7, R13 1K65 ohm

R8, R14 2K35 ohm

R9, R15 3K ohm

LM317T

LM337T

C5, C8 2200uF 25v electrolyte

C6, C7, C9, C10 22uF 25v electrolyte

C1-C4 0.1uF Ceramic

F1 0.5A fuse

S Switch

S1, S2 6-way rotary switch

T1 Center taped transformer 15-0-15v 220v

Red LED