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#132189 05/31/05 03:21 AM
Joined: Jul 2002
Posts: 8,423
Likes: 3
Trumpy Offline OP
Member
Just a quick question.
Which of the output leads from a PSU are the 12V and 5V leads?.
As in the red wires and the yellow wires.
I used to know this off-by-heart, but I'll be blowed if I can remember now.
I'm assuming that the Red wires are the 12VDC wires and the Yellow wires are the 5VDC wires.
Can anyone confirm this, or on the other hand, tell me otherwise?.

Cheers,
Mike.
[Linked Image]

[This message has been edited by Trumpy (edited 05-31-2005).]

#132190 05/31/05 06:34 AM
Joined: Jul 2004
Posts: 145
C
Member
The yellow is +12v, the red is +5v.
Other wires potentially of interest:
Brown: +3.3v
Blue: -12v
White: -5v
Green:PS_ON, [Short to ground to turn the PSU ON]
Black: Ground
Purple: +5v Standby [permanently on while AC Supply is live]
Grey: Power good signal from PSU

These apply only to ATX power supplies, and some manufacturer specific ones, [eg dell etc.] may be different, even in a dangerous way. However, the +5v=red and +12v=yellow seem to be universal.
(Edit: I found a good page of information here .
The info may be slightly out of date as some of the modern PSUs don't supply the negative voltages which were only used for serial ports, and there may be extra connectors for more modern higher power motherboards)

[This message has been edited by chipmunk (edited 05-31-2005).]

#132191 05/31/05 08:49 AM
Joined: Jul 2002
Posts: 8,423
Likes: 3
Trumpy Offline OP
Member
Cool,
Thanks Chipmunk,
Just wanted to make sure. [Linked Image]

#132192 05/31/05 11:52 AM
Joined: Jul 2004
Posts: 9,745
Likes: 13
G
Member
PC supplies are pretty good for other uses but be aware some older designs will not start without a load.


Greg Fretwell

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