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Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Short of completely opening it up and fiddling with the pins on the TL494 to change the PWM, I'd just get 2 cheap PSU's and series the 0-12V segments, because the -12V rail has only tens or hundreds of mA, while the +12V rail always has 10's of amps.
Keep in mind that computer PSU's have short circuit protection, if you apply a low-resistance load too quickly it might decide that its a short and simply shut down gracefully (ie: without asplosions).
Registered Member #1914
Joined: Wed Jan 07 2009, 06:50PM
Location:
Posts: 17
so what you are saying is that i should get two cheap power supplies and series two of the 4pin molex's to get 24VDC? that makes sense, but how do i make sure i dont pull any more than 5A?
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Well what you'd want to do is mod the PSU so you have binding posts instead of the 24 pin connector so you can just plug everything together with jumpers.
As for current limiting, you can use mosfets to do a current limited power supply.
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24VDC@5A from a PSU?
