ATX PSU mods

A

Alan Peake

Guest
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
 
"Alan Peake" <adpeake@killspam.internode.on.net> wrote in message
news:43536012.6040408@killspam.internode.on.net...
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
Click to expand...
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.
 
On Mon, 17 Oct 2005 18:25:54 +1000, Alan Peake
<adpeake@killspam.internode.on.net> put finger to keyboard and
composed:

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

"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:bqt7l1lfjjaavikdehqou6c4cnm8os3rq2@4ax.com...
On Mon, 17 Oct 2005 18:25:54 +1000, Alan Peake
adpeake@killspam.internode.on.net> put finger to keyboard and
composed:

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.
Click to expand...
 
Craig Hart wrote:
In an ATX PSU, the "on" signal is momentary - so a fixed wire or toggle
switch won't do. A push-button would sffice.
Click to expand...
Actually a fixed wire "does" fine.
 
Alan Peake wrote:

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
Click to expand...
 
http://www.epanorama.net/links/psu_switching.html
Click to expand...
Ah! Excellent - just what I was looking for - Google never found it though.
Alan
 
Alan Peake wrote:

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


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

Yes it did , under ham atx converted power supply :)
Click to expand...
 
On Tue, 18 Oct 2005 03:42:47 GMT, "Craig Hart" <news@news.com> put
finger to keyboard and composed:

In an ATX PSU, the "on" signal is momentary - so a fixed wire or toggle
switch won't do. A push-button would sffice.
Click to expand...
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" <fzabkar@iinternode.on.net> wrote in message
news:bqt7l1lfjjaavikdehqou6c4cnm8os3rq2@4ax.com...
On Mon, 17 Oct 2005 18:25:54 +1000, Alan Peake
adpeake@killspam.internode.on.net> put finger to keyboard and
composed:

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.
Click to expand...
-- Franc Zabkar

Please remove one 'i' from my address when replying by email.
 
Ah! Excellent - just what I was looking for - Google never found it
though.
Alan

Yes it did , under ham atx converted power supply :)
Click to expand...
Damn! Why didn't I think of that :)
 
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