I'm looking for a PSU with +25V or some kind of adapter to get that voltage on a regular ATX power supply, if possible. I have a Macintosh G4 for which I don't want to buy an expensive replacement unit. Any ideas?
check out http://www.bgmicro.com or http://www.hsc.com - they often have unusual voltage power supplies at decent prices.
. And you could try eBay and Froogle for an Apple PSU.
Using the -12 v instead of ground would give you a 24 volt difference but I'm not sure that would work for something as complicated as a mac motherboard. Additionally the -12 volt on an atx power supply typically has next to nothing for actual power it's able to produce. Maybe 1 or 2 amps at most. That would work for lamp or a fan that wanted 24 volt but once again doubt it's gonna work for a motherboard.
No, don't use -12 and +12 on a standard ATX PSU! For a fan or other low current device that might be OK. But for something like a mobo, the amperages would have to be balanced. What the heck in their systems actually needs 25V anyway?
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