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Thread: can we build a sound dependent resistor

  1. #1 can we build a sound dependent resistor 
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    just like a thermister and a LDR can we have a sound dependent resistor?? if yes then how!!!


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    Brassica oleracea Strange's Avatar
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    we can. Old telephones used to use a carbon microphone. This had a cartridge full of carbon grains. The changing pressure of sound waves would push the carbon grains together changing the resistance. Many modern microphones use cermet (ceramic-metal) materials to achieve the same thing.


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  4. #3  
    val
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    how do you want to use it?any microphone can act like a sound resistor.
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