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advanced psu question: only using +/-12V, +/-5V

S

shrink

[H]ard|Gawd
Joined
Jul 28, 2000
Messages
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I want to use a computer power supply (since they are cheap and have the output voltages I need) for just the +/-12V and +/-5V lines. Is this possible and still get the rated current out of them?

Namely, can I get by without having to use the 3.3V line, etc? I know that you have to jumper the power supply to get it to turn on which is easy to do.

I would be using this to bias up some op amps and jfets (which need atleast 100mA of current) and a computer power supply seems like the cheapest route.
 
100 ma of current is a far cry for the many AMPs a computer PSU is capable of producing. I mean it’s doable for sure, just sounds like total overkill. For a few bucks you can get an AC brick that can provide 2 plus AMPs of current and be much simpler to use.

What the heck you building? ;)
 
for just the +/- 12 and +/-5, I'd just use an old AT power supply, they have a hard switch and will provide all the juice you could use (although all PC PSU's are weak on the negative side, mobo's never used much of that, mostly for serial ports. Plus they should be plentiful and cheap.
 
agree with the above, and would point out that in the highly unlikely event a new ATX12V v2.0 supply was pressed into service it would lack the -5V altogether

all(?) AT and most ATX supplies have a combined +3.3V and +5V rail
(as far as the capacity goes, the amp ratings being interdependent but typically rated seperately)
 
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