Diy power supply from an old computer psu
From wikiluntti
Introduction
Theory
12 V and 5 V.
Current
Wire Coloring
- Black: Ground (0V)
- Orange: +3.3V
- White: -5V
- Red: + 5V
- Purple: +5V standby
- Blue: -12V
- Yellow: +12V
- Grey: power is on indicator
- Green: ON/OFF switch; turn DC on by shorting to ground.
Power Switch
This system need to reverse the GND and 12V line.
- Yellow cable (12V) on the colored terminal,
- a black wire (GND) to the pin opposite,
- the green cable (ON/OFF) to the centre pin.
In normal operation illuminated SPST switches have 3 terminals
- the centre pin: green Power ON/OFF
- one is indicated either by a different colour or labelled GND.
- The terminal opposite would normally be wired with 12V,
The Fake Load
10W 10Ω resistor between 5V (red) and GND lines.
