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Ideas for electromechanical resonance?

Discussion in 'Electronic Basics' started by default, Aug 24, 2009.

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  1. default

    default Guest

    I'm wondering if anyone has done this and how:

    I want to resonate a high carbon steel bar at its fundamental
    frequency to produce an audio tone. The bar is 1/8" thick, 6-1/2"
    long and 1-1/2" wide and resonates at about 400 Hz when struck.

    The bars are supported at their "nodes" and do resonate nicely.

    What I'd like is a circuit to get it producing a continuous sine wave.
    So far I haven't had much luck getting enough feedback to produce
    oscillations using a simple circuit similar to a tuning fork
    oscillator. (think Buliva "Acutron" watch circuit but with a high
    current supply and a power transistor)

    I want it to work with a plain steel bar - no magnets attached to the
    bars nothing in contact with the bars and preferably a simple one
    transistor low tech circuit -




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  2. default

    default Guest

    Good idea. There might be some homebrew guitar pickups around.
    Surely a steel string would be harder to amplify than a heavy metal
    bar?

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