Dual-rail Variable DC Power Supply with LM358

Dual rail Variable DC Power Supply with LM358

Simple add-on for a single-rail supply
±2.5V to ±15V output


R1,R2____________4K7 1/2W 1% or 2% Metal Oxide Resistors

C1,C4,C5_______100nF 63V Polyester Capacitors
C2,C3__________220µF 25V Electrolytic Capacitors

Q1____________BD437 45V 4A NPN Transistor
Q2____________BD438 45V 4A PNP Transistor

IC1___________LM358 Low Power Dual Op-amp

Input and output connecting terminals etc.

This simple unit provides a dual-rail variable output ranging from ±2.5V to ±15Vdc with precise tracking of the positive and negative output voltages, still retaining the current limiting and short-proof capabilities of the “master” circuit.
As the purpose of such a dual-rail design is to supply experimental or under-repair circuits, the maximum current output delivered was deliberately kept to about 500 – 600mA per rail, thus avoiding the use of expensive power transistors and complex circuitry.

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