Category: Main page » Power Circuits

Fixed Voltage Power Supply

The fixed voltage power supply is useful in applications where an adjustable output is not required. This supply is simple, but very flexable as the voltage it outputs is dependant only on the regulator and transformer you choose. The maximum output current is 1.5A.

Schematic


This is the schematic of the Fixed Voltage Polarity Power Supply

Parts

Part

Total Qty.

Description

Substitutions

C1

1

2200uF 35V Electrolytic Capacitor

C2, C4

2

0.1uF Ceramic Disc Capacitor

C3

1

10uF 35V Electrolytic Capacitor

D1, D2

2

1N4007 Silicon Diode

BR1

1

2A 30V Bridge Rectifier

U1

1

Regulator (See Notes)

T1

1

Transformer (See Notes)

S1

1

SPST 2 Amp Switch

F1

1

2A 250V Fuse and Holder

MISC

1

Heatsink For U1, Line Cord, Case, Wire

Notes

1. Since this project operates from 120 (or 220, or 240, etc.) volts AC, it MUST be built inside a case.

2. U1 will reauire a heatsink.

3. You will need to choose T1 and U1 to match the voltage you want. Use the table below as a reference.


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