Re: Using a PC PowerSupply as a bench power supply.
- From: "Michael A. Terrell" <mike.terrell@xxxxxxxxxxxxx>
- Date: Sat, 26 Apr 2008 12:49:05 -0400
sid wrote:
The article discussed minimum loads, but it I don't recall where it
stated AT or ATX.
You stated the gray (power good) wire could be ignored, but I thought
that the board needed to put a signal back on this wire to turn the PS
on for the rest of the system ?
Is this not right ?
Power good is an output from the power supply to the motherboard to
tell it that all the outputs are in spec. It goes low if there is a
problem, and is low until the power supply is stable. It was used for
'reset' on older motherboards.
http://www.interfacebus.com/Mother_Board_ATX_Pinout.html shows the
pinout of a standard ATX power supply. Ground pin 14 to turn it on, and
remove the ground to turn it off. ATX motherboards operate the power
switch from the standby +5 VDC on pin 9, which is always on. This is a
low current source, only intended to power the on/off function, and
'wake on LAN'.
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