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Anyone know of a resistor that is sensitve to sound vibrations? Answered

Does anybody know of something like a photo cell, except instead of the light being the variable to determine the resistance of a circut, it would be sound and vibrations? If ya do, could ya give me a comment on what it would be called, what they're used in, and where ya could maybe buy one? Thanks! -xD

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! xD !

9 years ago

I think I kind of get what ya'll are sayin'... Are piezoelectric elements used in those neon lights placed under cars that pulse to music? Because thats the kind of concept I was thinking, the different frequency determines the output of electricity to the circuit. I looked into it a little, but to me it sounds like they don't "pulse" to the frequency, they only let out electricity due to reaching a certain frequency, and continue releasing that same amount, unless dropped below the given frequency. Are there piezoelectric elements that have more of a "pulse" effect? I don't know how clear that is, but I hope ya catch my drift, and can maybe elaborate on that. By the way, thanks for the help! -xD

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kelseymh

9 years ago

Besides doing a Google search on "piezoelectric" (as NIP already wrote), the carbon electret microphone used in old-style telephone handsets was exactly a "sound-sensitive variable resistor." Look up "telephone" in Wikipedia to learn more.

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NobodyInParticular

9 years ago

A piezoelectric element converts shape changes into a voltage (or vice versa). They are commonly used for microphones, especially in cases where you want it to respond to a particular narrow range of frequencies. They also have a high resistance.