condenser microphones
October 1, 2009 by SemiCritic
Filed under Music
A microphone is oftentimes alternately called a mic or a mike. It is a sensor that converts sound into an electrical signal. It has many applications, the ones we are familiar with being in telephones, tape recorders and hearing aids. It is widely used in radio and television. A more recent application is the VoIP.
A capacitor has two plates with a voltage between them. In condenser microphones, one of these plates is made of very light material and acts as the diaphragm. The diaphragm vibrates when struck by sound waves, changing the distance between the two plates and therefore changing the capacitance. Specifically, when the plates are closer together, capacitance increases and a charge current occurs. When the plates are further apart, capacitance decreases and a discharge current occurs.
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