Jerry Boone wrote:
Sure,

Computer power supplies (types AT & ATX) both output 5 volts (yellow wire) &
12 volts (red wire), just don't exceed the wattage output which is probably
on the power supply label.

It's a LOT more complicated than that.


For instance, if the device you are powering needs 5 amps at 12 volts, your
power supply needs to be capable of at least 70 watts (dc voltage x dc
amperage = dc watts)

5 X 12 = 60



AT power supplies are the easiest since they are generally not reliant on
the motherboard and have a physical switch. ATX power supplies generally
have a purple wire that I think you have to tie to the yellow - could be all
wrong on that,

Yes, you could

it's been a couple years but that's the general idea.







"birdman" wrote in message
oups.com...

Would like a computer power supply for other purposes without a
motherboard connected. Either AT or ATX? Has anyone done this? If so,
how?
Any help?

Bottom line is that computer supplies are UNSUITABLE for most
applications. Yes, you can think of a zillion places where it would
work. But if you have to ask the question, you're unlikely to be able
to tell where they're applicable.

If all you need is noisy 5V and don't mind welding your screwdriver
to your circuit when you slip, you're likely to be successful.
mike

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