how do you hack an AT power supply?

Windows Hardware 9627 This topic was started by krkchn, 2005-03-14 03:02

Discussion 4

1 Posts
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Joined 2005-03-14

2005-03-14 04:02

I need a power supply for use for my circuitry project since it has 5V and 12V. I currently have an AT power supply but the problem is that it automatically turns off when not connected to a motherboard. I need a circuit hack of sort to make the supply constantly turned ON. I appreciate any help.

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Responses to this topic

felix

686 Posts
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Joined 1999-10-28

#144166

2005-03-14 04:15

I think you mean an ATX supply.

The ATX supply design is "always on" with a relay start switch which then closes the circuit.

You would be better using an AT supply that has an actual switch which controls the power and was used in older systems.

jmmijo

1547 Posts
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Joined 2002-05-29

#144167

2005-03-14 07:59

If this is indeed an ATX power supply, then check out the specs at THIS site for more info. Look at section 3.3.2 for the PS_ON# pin which needs to be an active low

AndyFair

748 Posts
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Joined 2001-05-21

#144168

2005-03-14 12:52

In other words, if you connect pin 14 (old-style 20 pin connector) or pin 16 (new style 24-pin connector) - green wire - to any ground connector (black wires), the PSU will start - as long as the power lead is plugged in

jmmijo

1547 Posts
Location -
Joined 2002-05-29

#144169

2005-03-14 20:16

Originally posted by AndyFair:

Quote:In other words, if you connect pin 14 (old-style 20 pin connector) or pin 16 (new style 24-pin connector) - green wire - to any ground connector (black wires), the PSU will start - as long as the power lead is plugged in

Correct