Small Electret Microphone (Low) Useful in acoustic and audio applications.A microphone as an audio-electric converting device, whose
audio pickup section has a structure of a condenser consisting of
a diaphragm and a back plate opposite thereto, is called a
condenser microphone.
The motion of the diaphragm by sound is picked up as a variation
of capacitance between the diaphragm and the back plate.
In this case, usually, a voltage of tens or hundreds of volts should
be applied extermally as a condenser polarizing voltage.
However, electric charge can be maintained in a polymer film by
the electret effect, thereby eliminating the polarizing direct-current
high voltage. Such is an electret condenser microphone.
In structure, electret condenser microphones are grouped into the
following three types according to where the electret film is used:
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