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Electret materials have been known since the 1920s and were proposed as condenser microphone elements several times, but they were considered impractical until the foil electret type was invented at Bell Laboratories in 1961 by Gerhard Sessler and James West, using a thin metallized Teflon foil.
First patent on foil electret microphone by G. M. Sessler et al. (pages 1 to 3) An electret microphone is a type of condenser microphone invented by Gerhard Sessler and Jim West at Bell laboratories in 1962. [24] The externally applied charge used for a conventional condenser microphone is replaced by a permanent charge in an electret material.
The microphone generates its own voltage and needs no power. Devices that use a self-powered microphone: usually a condenser microphone with an internal battery-powered amplifier. Devices that use a plug-in powered microphone: an electret microphone containing an internal FET amplifier. These provide a good quality signal in a very small ...
The following is a list of defunct microphone manufacturers with articles. Aiwa; Altec Lansing; American Microphone; Ampex; Astatic; Brush Development Company; Dynaco ...
First patent on foil electret microphone by G. M. Sessler and J. E. West (pages 1 to 3) West was born on February 10, 1931, in Farmville, Prince Edward County, Virginia as the elder of two children to Samuel Edward and Matilda West. He was born in his maternal grandfather's house because the local hospital would not admit Black people.
C451 - a small diaphragm condenser microphone, originally made between the 1960s and 1980s, recently reissued; C535 - a high-quality condenser vocal microphone. AKG made a gold-plated one for Frank Sinatra. [25] D409; D5; C1000S microphone. C1000S - a small diaphragm condenser (four versions released from 1986 to 2012)