ATX Power Supply, Voltages Possible?

Discussion in 'The Projects Forum' started by yardleydobon, Apr 20, 2009.

  1. yardleydobon

    Thread Starter Member

    Apr 19, 2009
    Everyone has seen those tutorials on how to create a benchtop power supply out of an old computer power supply. There are many possible voltage combinations one can get from 12, 5, 3.3, -5, and -12 V. It seems to me though some of them are bad ideas because some of the sources that are meant to supply current are sinking it. Such as 12-5=7 V. That has current flowing out of 12 and into 5. Isn't that in general a bad idea with this kind of power supply?

    I'm thinking combinations like 12-(-12) = 24 V should be OK. Or is this bad too?