Audio tape?
Victor, indeed. I saw a patent once that had a power source that used the tape drive motor to power a small generator in a cassette tape for an external speaker device. Ingenious.
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nice. how much power can you get from that?
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Rock, it was 9 volts with good enough amps to drive a 25 watt RMS stereo system. The patent was really more about the small pre IC transistors and capacitor arrangements really high density for the period. I am sure it never got built though.
End of conversation
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