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Power supply control

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Hi everyone,
I want to use some isolate devices(opto, FET, BJT, Relay) to control (active/deactivate via a pin of microcontroller) a power supply 12V-5A via a pin of microcontroller. Please suggest me a optimizing way to implement my ideas.
Thanks a lot!

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Do you already have a power supply in mind?  ATX power supplies are fairly easy to control (they need a switch to momentarily connect a couple of pins).  

I think it is 5volt involved, so you might need to adapt it so can safely connect the pins using a micro-controller (depends on the micro).

(ATX power supplies require some minimum draw on particular lines.)


ATX PSU may be a bit overkill, depending on your needs.

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