Automatic level controller

Details Automatic level controller Automatic level controller

1975-12-10

1976-10-26

Rolinec, R. V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

325410, 330141, 330207P, H03G 330

Patent

active

039886948

ABSTRACT:
An automatic level controller comprising a switching transistor connected to the output stage of an audio amplifying circuit to be turned off when the output signal of the audio amplifying circuit attains a predetermined level, a control transistor connected to the input stage of the audio amplifying circuit for bypassing to the ground a portion of the audio signal applied to the audio amplifying circuit thereby controlling the audio level, a diode adapted to be turned on in response to the turn-off of the switching transistor for supplying current from a power source to the audio level control transistor as an audio level control signal, and a time constant circut for setting the attack period and release period of control by the audio level control signal.

REFERENCES:
patent: 3790896 (1974-02-01), Shimizu et al.
patent: 3893038 (1975-07-01), Omata et al.

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