[sdiy] Converting Computer Power Supplies

[vitreousflux]

I found that PC power supplies actually don't provide necessary voltage.

Look at the current rating for the -12v. Most are 300mA or lower.

Additionally, if you are looking at current power supplies, ATX uses a
'soft' switch, not hardwired like older AT supplies.

I actually tried using an AT supply with my EFM SBM and it just didn't have
enough power - then I used my bench power supply for the -12v (with the PC
supply at +12 and +5), and things worked fine.

Highly recommended is a small power supply at www.allelectronics.com, called
the "inexpensive 17w power supply" - they are super cheap, I wired two in
tandem so that one is negative, one is positive. Works like a charm. At
$2.50 you can't go wrong. I bought 10 of them....


Rob


----- Original Message -----
From: "Grant L. Muller" <lotekk at msn.com>
To: <synth-diy at node12b53.a2000.nl>
Sent: Wednesday, May 23, 2001 1:17 PM
Subject: [sdiy] Converting Computer Power Supplies


>
>
> Hi, I just finished a couple of small effects projects (my first ones,
they
> turned out great and I only burned myself with the soldering iron once,
> Yeah!), and was thinking to myself, "these are gonna need some power other
> than 9 volt batteries", so I decided iot would probably be easy to convert
> my computer power supply over as one, since it puts out enough power. The
> only problem is, I don't know which pin is which on those molex 4-pin
> connectors. So, if anyone has done this before, and could let me know the
> easiest way to do this, or if you simply know what the pin-out is on these
> things, that would be great. Thanks!
>
>
> Sincerely,
> Grant "Now-addicted-to-DIY" Muller
>
>