ATX PSU mods

• • H
  • Heywood Jablome
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• posted
  16 years ago
  Mon, Oct 17, 2005 8:18 AM

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Build two, and wire in series. You will have close enough to 28V at 20A. You will need to isolate the PCB from the case off one of the power supplies.

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Heywood Jablome

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  • Alan Peake
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• posted
  16 years ago
  Mon, Oct 17, 2005 8:25 AM

Hi all,
Have been looking at the article in SC re converting AT power supplies
to 13.8V bench supply. Has anyone done this with an ATX supply? In
addition to being able to get 13.8V @ 20A, I'd also like to modify one
to give around 28V @ whatever current it can produce - preferrably >15A
Alan

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  • Franc Zabkar
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  16 years ago
  Mon, Oct 17, 2005 8:21 PM

On Mon, 17 Oct 2005 18:25:54 +1000, Alan Peake put finger to keyboard and composed:

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I can't see that an ATX PSU would be any different, except that you'd need to either short the PS_ON pin to ground permanently, or install an SPST switch to switch the PSU on and off.
-- Franc Zabkar
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  • Craig Hart
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  16 years ago
  Tue, Oct 18, 2005 3:42 AM

In an ATX PSU, the "on" signal is momentary - so a fixed wire or toggle switch won't do. A push-button would sffice.

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  • Mark Harriss
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  16 years ago
  Tue, Oct 18, 2005 3:53 AM

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Actually a fixed wire "does" fine.

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  • atec
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  16 years ago
  Tue, Oct 18, 2005 3:57 AM

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  • Alan Peake
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  16 years ago
  Tue, Oct 18, 2005 8:10 AM

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Ah! Excellent - just what I was looking for - Google never found it though. Alan

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  • atec
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  16 years ago
  Tue, Oct 18, 2005 9:22 AM

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Yes it did , under ham atx converted power supply :)

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atec

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  • Franc Zabkar
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  16 years ago
  Wed, Oct 19, 2005 6:11 AM

On Tue, 18 Oct 2005 03:42:47 GMT, "Craig Hart" put finger to keyboard and composed:

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The case button is momentary, but the motherboard's PS_ON output is not.
See

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When I power up a new system for the first time, I use a jumper wire between the PS_ON and Ground pins. The only load connected to the PSU at this time is an expendable HD.

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-- Franc Zabkar
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  • Alan Peake
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  16 years ago
  Wed, Oct 19, 2005 7:33 AM

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Damn! Why didn't I think of that :)

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