Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1976-06-18
1977-04-05
Rolinec, Rudolph V.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
179 1VL, 330 31, H03G 330
Patent
active
040165027
ABSTRACT:
An input amplifier stage for a microphone which includes a transistor having a load circuit including a load resistor and an emitter resistor. In a preferred embodiment, using a transistor of the NPN type, a volume control potentiometer is provided having a first terminal which is coupled to the emitter and a second terminal which is coupled to the output of the stage, with the wiper being grounded so that (a) when the wiper is adjacent the emitter, the emitter resistor is effectively shunted by low resistance thereby increasing the gain of the transistor stage while leaving the output terminal substantially free of shunting effect for maximizing the output signal, and so that (b) when the wiper is adjacent the output terminal, the stage output terminal is effectively shunted by a low resistance while leaving the emitter resistor substantially free of shunting effect for decreasing the gain of the stage and minimizing the output signal. A limiting resistor and capacitor are effectively interposed in series with the first terminal of the potentiometer to limit the maximum gain of the stage to a reasonable level and for preventing noise from being generated by the wiper.
REFERENCES:
patent: 2997656 (1961-08-01), Barlow
patent: 3980965 (1976-09-01), Cunningham
Cahill Bernard S.
Heinz Harro K.
Dahl Lawrence J.
Rauland-Borg Corporation
Rolinec Rudolph V.
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