Home Projects Power Dual Adjustable Power Supply


Dual Adjustable Power Supply
author: Rajkumar Sharma

This project is a solution to power up most of devices or projects requiring dual (+/-) adjustable power supply.


The circuit is based on LM317 positive and LM337 negative voltage regulators. LM317 series of adjustable 3 terminal regulator is capable of supplying in excess of 1.5A over a  1.2V to 30V DC output range, due to TO3 package of  IC and large heat sink the power supply can handle maximum load  current.

Output: +/- 1.2 to 30V DC
Output Current: 1.5Amps
Supply Input: 24V-0-24V AC, 2Amps Center tape Transformer
CN1: Transformer Connections
CN3: +/- Dual Supply Outputs
P1: Positive Voltage Adjust
P2: Negative Voltage Adjust
D1: Positive Power Indicator
D2: Negative Power Indicator


click for full resolution


Parts List

PCB Design

PCB top layer


PCB bottom layer




120x90 spot



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