A Mathematical Explanation Moving Coil Microphone Electret Microphone Circuit Pre-Amplifier Circuit Possible Layout
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This device has a microphone and pre-amplifier built into a small enclosure. It is important to connect it the right way round because the built-in preamp might be destroyed otherwise. The preamp uses a field effect transistor (FET).
This microphone uses two metal plates as a capacitor. One of the plates moves or vibrates in step with incoming sound waves. This causes the capacitance to change.
Q = CV
Q = charge (Coulombs)
C = capacitance (Farads)
V = voltage (Volts)
Since Q stays constant (it does not have time to change) and since C changesit follows that V will change. Thus incoming sound waves are converted into a proportional alternating voltage. This voltage is amplified by the built-in FET. This is a delicateeasily damaged component.