I don't think there is a spot on the board that will provide constant +12V only when the OUYA is on.
Your best bet is a latching pushbutton switch or a normal toggle switch.
I've been thinking about this a little bit. I think I finally have a good use for the reset button on my mininess case.
It will be a latching DPDT switch which connects to the fan and switches between always on (connected as the above example) and auto (connected to original fan header).
Really, the fan setting should be available in the software...yet another short-coming of the platform.




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