I am slowly gathering the bits together for this as a side project - and a few of the online instructions for using a donor ATX PSU as a benchtop switching power supply talk of using -12V and +12V to create a 24V source, from which you can supply a variable regulator and dial up different voltages. I want to make a somewhat more considered choice on which of these PSUs will be the one for the job.
The question is, if the +12V rail can provide 10A (say) and the -12V rail is rated at a max of 0.3A would the combination of the two be capable of 10.3A, or is it the lesser of the two, or some different calculation. Happy to do some reading if you know of a decent explanation somewhere and can provide a link. My google-fu has failed me on this one.
Thanks ! Geoff