ATX PSU mods

[Heywood Jablome]

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

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.

 

[Alan Peake]

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

 

[Franc Zabkar]

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

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

Please remove one 'i' from my address when replying by email.

 

[Craig Hart]

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

 

[Mark Harriss]

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

Actually a fixed wire "does" fine.

 

[atec]

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

http://www.epanorama.net/links/psu_switching.html

 

[Alan Peake]

http://www.epanorama.net/links/psu_switching.html

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

 

[atec]

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

Yes it did , under ham atx converted power supply

 

[Franc Zabkar]

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

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

See http://www.pavouk.comp.cz/hw/en_atxps.html

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.

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

 

[Alan Peake]

Yes it did , under ham atx converted power supply

Damn! Why didn't I think of that