eCosmology

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Science<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<?

all right, i'm trying to do a science fair project about microphones and the fact that they produce electricity (little ones) I was wondering if i could get some help on that. How much electricity does one microphone create and how it works... THNKS

Public Comments

1. erection of particles
2. Very very tiny amount. It depends on the type of microphone, and there are many types. Condenser mike, produces no electricity, as it is a moving capacitor and requires external excitation. Dynamic microphone produces perhaps 1 mV into 100 ohms (a guess) or 10 nW Carbon Microphones are your best bet, they were used in old telephones as they develop enough power to send the signal directly over the wires without amplification. They will produce as much as 1/2 volt. See reference. But they do require a DC bias. Piezoelectric microphone will output a good fraction of a volt also, but they must work into a high impedance, so the power is low. .