DIY Power Supply from ATX PSU: Difference between revisions
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* Make sure that the PSU has been disconnected for 3+ days or grab the resistor and put it between a 5 volt and a ground pin | * Make sure that the PSU has been disconnected for 3+ days or grab the resistor and put it between a 5 volt and a ground pin | ||
The power resistor: Solder a 10 watt power resistor to PIN 3(COM/ | The power resistor: Solder a 10 watt power resistor to PIN 3(COM/black) and 4(+5C red) – This creates a load on the power supply. | ||
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Revision as of 10:45, 17 June 2025
Introduction
Theory
Parts
- On/Off Switch
- Fuses
- 2 live and 2 ground speaker terminal for 5V (red and black)
- cigarette lighter socket
- 10 watt 10 ohm resistor
Warning: Condensator charge:
- Make sure that the PSU has been disconnected for 3+ days or grab the resistor and put it between a 5 volt and a ground pin
The power resistor: Solder a 10 watt power resistor to PIN 3(COM/black) and 4(+5C red) – This creates a load on the power supply.
| Header text | Header text | Header text |
|---|---|---|
| Black | 0 V (GND) | COM |
| Orange | +3.3V | |
| Red | +5V | |
| Yellow | +12V | |
| Yellow + black stripe | +12 V (2nd rail) | Newer PSUs |
| White | -5V | Not in newer PSUs |
| Blue | -12 V | Not in newer PSUs |
| Brown (small gauge) | +3.3V sense | Must be connected to the orange (+3.3V) to allow the PSU to detect and regulate output |
| Pink (small gauge) | +5V sense | Must be connected to the red (+5V) to allow the PSU to detect and regulate output |
| Yellow (small gauge) | 12V Sense | Must be connected to the yellow (+12V) to allow the PSU to detect and regulate output |
| Green | PSU on | Connect to GND; put the switch here |
| Grey | Power good (self test ok) | |
| Purple | +5V Standby | The indicator LED |
