Thread: can we build a sound dependent resistor

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

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.

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