Electret Condenser
Electret Condenser
What is the difference between a condenser and electret-condenser microphone?
What is the externally applied charge? How does that work? Is it where there's an external power source?
What does this charge do?
If an electret-condenser does not require an external power source, can one just talk directly into it and produce an electrical signal, an output sound?
In a condenser microphone, also called a capacitor or electrostatic microphone, the diaphragm acts as one plate of a capacitor, and the vibrations produce changes in the distance between the plates. There are two methods of extracting an audio output from the transducer thus formed: DC-biased and radio frequency (RF) or high frequency (HF) condenser microphones. With a DC-biased microphone, the plates are biased with a fixed charge (Q). The voltage maintained across the capacitor plates changes with the vibrations in the air, according to the capacitance equation (C = Q / V), where Q = charge in coulombs, C = capacitance in farads and V = potential difference in volts. The capacitance of the plates is inversely proportional to the distance between them for a parallel-plate capacitor. (See capacitance for details.) The assembly of fixed and movable plates is called an "element" or "capsule."
http://en.wikipedia.org/wiki/Microphone
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