Diy power supply from an old computer psu: Difference between revisions
From wikiluntti
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=== Wire Coloring === | === Wire Coloring === | ||
* Black: Ground | * Black: Ground (0V) | ||
* Orange: +3.3V | * Orange: +3.3V | ||
* White: -5V | * White: -5V | ||
* Red: + 5V | |||
* Purple: +5V standby | |||
* Blue: -12V | * Blue: -12V | ||
* | * Yellow: +12V | ||
* Grey: power on indicator | * Grey: power is on indicator | ||
* Green: ON/OFF switch | * Green: ON/OFF switch; turn DC on by shorting to ground. | ||
=== Power Switch === | === Power Switch === | ||
Revision as of 08:47, 11 June 2023
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.
