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An electret microphone is a microphone whose diaphragm forms a capacitor (historically-termed a condenser) that incorporates an electret. The electret's permanent electric dipole provides a constant charge Q on the capacitor.
English: A typical electret microphone preamp circuit uses a FET in a common source configuration. The two-terminal electret capsule contains an FET which must be externally powered by supply voltage V +. The resistor sets the gain and output impedance. The audio signal appears at the output, after a DC-blocking capacitor.
Included in the retail box are an SD card, desk stand, handle for putting the H2 in a microphone stand, wind screen, 3.5mm TRS to RCA cable, earbud headphones, USB cable and power adapter. The H2's microphones, functionality, and use of standard USB and SD interfaces make it suitable both for recording high-quality sound and in many speech ...
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.
First patent on foil electret microphone by G. M. Sessler and J. E. West (pages 1 to 3) From 1950 to 1959, Sessler studied physics at Universities of Freiburg , Munich, and Göttingen . He received his diploma in 1957 and his Ph.D. from the University of Göttingen in 1959.
The large size and weight of the RE20 requires a strong microphone stand or boom arm, and a very sturdy microphone clip or robust hanging yoke. The supplied mic clip (model number 320) is tightened securely with a knurled knob. An optional shock-mount is available for the RE20 family of microphones: the EV model 309A.
Electret mics with plug-in power are unfortunately not addressed in this article. Please update! Thanks, Maikel 13:45, 11 November 2012 (UTC) I think 'Plug In Power' was (1990's?) just a Sony term for a conventional electret microphone to plug into their cassette tape recorders - ie requiring +2-3 volts down the signal lead to power the FET.
The directionality of the 77-DX is variable. A rotating backshutter on the acoustic labyrinth, controlled by a screwdriver-operated slot at the rear of the microphone, allows the user to vary the microphone's pattern from omnidirectional in the fully closed position, to cardioid, to figure-8 (bidirectional) in the fully open position.
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