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The JFET is externally-powered by the DC voltage V + through a resistor which sets the gain and output impedance. The output audio signal is received though a DC blocking capacitor . An electret microphone is a microphone whose diaphragm forms a capacitor (historically-termed a condenser ) that incorporates an electret .
This current dependency is not supported by the characteristics shown in the diagram above a certain applied voltage. This is the saturation region, and the JFET is normally operated in this constant-current region where device current is virtually unaffected by drain-source voltage. The JFET shares this constant-current characteristic with ...
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Symbol for an N-Channel JFET with label (S,D,G) G = Gate D = Drain S = Source. Svenska: Schematisk symbol för en JFET (Junction Field Effect Transistor) N-kanal. Date:
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
The first FET device to be successfully built was the junction field-effect transistor (JFET). [2] A JFET was first patented by Heinrich Welker in 1945. [4] The static induction transistor (SIT), a type of JFET with a short channel, was invented by Japanese engineers Jun-ichi Nishizawa and Y. Watanabe in 1950.
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The following other wikis use this file: Usage on az.wikipedia.org MOY-Tranzistorlar; Yarımkeçirici cihazlar; Usage on ca.wikipedia.org Transistor