Power generation from a cassette player?

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Power generation from a cassette player?

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pls 04-11-2006, 8:36 AM
I have a project that I'd like to construct inside a cassette.  I can use a battery, but I'd like to obviate the need for external charging.  My knowledge of both electrics and electronics is somewhat sketchy, and I am wondering if it would be feasible to use the kinetic energy from the turning of the capstan as a power source to keep the charge on a battery topped up.  How much power could this be expected to generate?  Could it manage 1.5 watts?

Any thoughts appreciated.

Thanks,
Paul