I had a very simple circuit that used a mosfet with an arduino to power a motor. The whole thing is run off of a 12v supply (5v reg. added to supply power to the arduino). The circuit was working fine before (a few months ago), but when I tried turning it on today, the motor wouldn't start. Here are my findings:
Multimeter says the motor wires (w/o motor connected) are in fact getting the needed 12v, but it drops to under a volt when I reconnect the motor.
I tried connecting my motor directly to the 12v supply, but it just made a big spark (I am not sure if the motor actually started, but it should not have sparked the way it did).
Nothing 'smells' like it is burned out, and nothing got abnormally hot. Does anyone have any idea as to what could have happened (I used the same PSU as before).