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Double up a computer PSU to generate +24VDC?

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k2rage101

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I bought a new high-power blower that needs +24V @ 15 amps. I am looking for a cost-effective way to power this thing, when I realized I have several old computer power supplies laying around. Two are identical, 400W, and have single +12V rails capable of 25 amps. My question is this: Can I link 2 computer PSU's in series to get +24VDC? (Can I attach PSU1 +12V to PSU2 GND, then power the blower from PSU1 GND to PSU2 +12V?) If this won't work for some reason (e.g., shorts out) please let me know!
Thanks.
 

i had done this few years ago,
as i remember i have only changed the size of rectifying diodes and the filter inductance wire of the -12V path to a larger size same as +12V path. i must say that i did this with one powersupply not two power supply((+12)-(-12)=24V)
 

How many amps was it capable of after your modification?
 

it's limited by the +12V max current which is determined by your supply power.you must be careful because there is no protection in the -12 path a short circuit will burn the switching mosfets in contrast to +5 and +12 which have protection and a short circuit will shut down the supply.
here i am sending you a schematic of pc power supply:
you can find some materials in the web for this case too.
 

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