Fixed Voltage Power Supply
Electronic Schematics > Power > 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.

This is the schematic of the Fixed Voltage Polarity Power Supply


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  


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.

Output Voltage T1 U1
5V 6V, 1.5A 7805
6V 6V, 1.5A 7806
9V 12V, 1.5A 7809
12V 12V, 1.5A 7812
15V 24V, 1.5A 7815
18V 24V, 1.5A 7818

Title: Fixed Voltage Power Supply
electronic circuit
Published on: 2005-02-03
Reads: 752
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Electronic circuits > Power > Fixed Voltage Power Supply