Modern electret microphones use PTFE plastic, either in film or solute form, to form the electret.
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Electret ears would be pretty cool . talk ) 23 : 02, 8 August 2011 ( UTC)
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First patent on foil electret microphone by G . M . Sessler and J . E . West ( pages 1 to 3)
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Standard handset receivers functions normally when their polarity is reversed, but the electret microphone transmitter used in most modern handsets may not.
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An electret microphone is a type of condenser microphone, which eliminates the need for a power supply by using a permanently charged material.
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Electret microphones and condenser microphones employ electrostatics as the sound wave strikes the microphone's diaphragm, it moves and induces a voltage change.
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The polar molecules of the dielectric align themselves to the direction of the electrostatic field, producing a dipole electret with a permanent electrostatic'bias '.
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Cellular space charge electrets with internal bipolar charges at the voids provide a new class of electret materials, that mimic ferroelectrics, hence they are known as ferroelectrets.
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Some other sensitive designs measure the current generated by the flow of a non-corrosive ionic fluid through an electret sponge or a conductive fluid through a magnetic field.
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Can someone suggest a battery-powered circuit for amplifying the output of an electret mike to drive a headphone ( the type commonly used for portable media players )?
