Dual Oscillator Detecting Changes In Capacitance Of Antenna, Like A Theremin

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Uploaded by on Apr 26, 2009

This is a circuit comprising of two oscillators. One's frequency is adjustable by means of a preset pot, the other changes due to changes in the capacitance of the antenna, caused by, in this case, a hand. The two oscillators beat against each other when mixed, and this is amplified by my guitar amplifier, connected to the red and green crocodile leads.

Yes, I know prototyping boards are not ideal for this application, but are the best option at present.

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  • Well, it could be used to detect all sorts of things which affect the capacitance of the antenna. It could detect a person, it could detect water and other similar things.

    SciGuy16

    P.S. "?"

  • What would be an application of this circuit

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