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Sound activate motor

Discussion in 'General Electronics' started by David, Apr 7, 2004.

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  1. David

    David Guest

    Hi, I want to make variable the speed of a DC motor with the amplitude
    of the sound or music. more the sound is louder more the speed is the
    DC motor. i want it operate with the headphone jack of a radio.

    Thank you for all your help.

    Ps.: I want the circuitry the most cheaper.
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