High Current
Power Supply
Since my page was first
posted, I have received a number of emails asking about a high current power
supply. I looked around, but couldn't find one that was suitable. So, I
designed this. It is a linear supply, which might have a few of you rolling
your eyes, but it takes very few parts, is simple to build and can supply huge
currents.
Schematic
Parts
Part |
Total Qty. |
Description |
R1 |
1 |
680 Ohm 1/4
Watt Resistor |
C1 |
1 |
20,000 -
50,000uF 20-40 Volt Capacitor |
C2, C3 |
2 |
100uF 50
Volt Capacitor |
C4 |
1 |
0.1uF 50
Volt Capacitor |
C5 |
1 |
0.01uF 50
Volt Capacitor |
D1 |
1 |
Zener Diode
(See Notes) |
Q1 |
1 |
2N3055 Or
Other (See Notes) |
T1 |
1 |
Transformer
(See Notes) |
BR1 |
1 |
Bridge
Rectifier (See Notes) |
S1 |
1 |
SPST 250 VAC
10 A Switch |
MISC |
1 |
Case, Line
Cord, Heatsink For Q1, Binding Posts For Output |
Notes
The choice of
BR1 will depend on the voltage and current of your transformer. The rectifier
should be rated for 50 volts more than the transformer,
and 5 amps more than the transformer.