

Fixed Voltage
Power Supply
source:
http://www.aaroncake.net/
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
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.
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 

