Russell McMahon wrote:

> You could even rotate the shaft with the whole electronic assembly attached
> and use fixed magnets on the "stator" and a coil on the rotor and
> effectively produce an alternator.


What about using a cheap "toy" type DC motor,
with the spinning clock PCB attached to the BODY
of the motor. The shaft is secured and stays
stationary, so when the thing is spun by another
motor and belt, the first motor acts as a DC
generator and powers the PCB. You can get these
motors in a round can, and use the belt from motor
2 directly on the round can of motor 1 to spin it.
-Roman

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