This comes in handy for testing most DC circuits that use 1.2 VDC up to 20 VDC. Total cost was less the $20. I know that this doesn't have the best looking wiring on the inside but I rushed placing components because I really needed it do for testing components at work.
Warning: In this project you wont be inside the PSU but if you do open it make sure to give a day or to unplugged for the capacitors to discharge. The wires coming out of the PSU only have 3 Amps so besides a quick shock there wont issues.
Step 1: Supply's
2. Screw Driver
3. Computer PSU
5. Soldering Iron
6. Drill & Bits
7. Wire cutters
8. Wire strippers
9. Volt Meter
10. Test leads with patch banana clips (red & Black)
superglue or epoxy
Step 3: Circuit Components
• 2 LEDs of any color (Red and Green)
• 2 Resistors 330 OHM
• Heat Shrink Tubing
• External Enclosure
• Drill and Bits
• LM317, LM338K, or LM350T Voltage regulator
• 100nF Capacitors (ceramic or tantalum)
• 1uF Capacitors Electrolytic
• 1N4001 or 1N4002 Power Diode
• 120 Ohm resistor
• 5k Ohm variable resistor
• Binding Posts
ATX Power Supply Extension Cable ( comes included with most PSU)
Step 4: Circuit
I tested the circuit on a bread board first.
note: the voltage regulator can have different pins from what is shown. make sure to look up the stats sheet.
Step 5: Future Improvements.
Add a USB port to it by connecting it to the 5 DCV.
Add a cigarette lighter to the 12 DCV if I can get it to fit inside case.
a built in voltage meter.