Back Electret A form of electrostatic or capacitor microphone. Instead of creating an electrostatic charge within the capacitor capsule with an external DC voltage, an electret microphone employs a special dielectric material which permanently stores a static-electric charge. A PTFE film is normally used, and where this is attached to the back plate of the capsule the device is called a ‘back electret’. Some very early electret microphones used the dielect

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Definition / notes:large, medium and small diaphragm sizes, single and dual membrane, fixed or multi-pattern, and so on.

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