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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.
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.
This list may not reflect recent changes. E. Electret microphone; U. Neumann U 47; Neumann U47 FET; Neumann U48; Neumann U67; Neumann U 87; V. Valve microphone
C4000B - a dual‑diaphragm multi‑pattern electret microphone SolidTube - (discontinued) A large-diaphragm microphone, cardioid polar pattern, dating from 1997. Use of a vacuum tube, (an ECC83 / 12AX7 ), for which spares are readily available, resulted in low-level distortion that may be perceived as an enhancement "warmth" to the sound.
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.