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A transistor automatic gain control system for audio frequencies

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1 Author(s)
Shirman, J. ; Stromberg-Carlson Company, Rochester, N. Y.

Automatic gain control (AGC) circuits are useful in obtaining relatively constant output levels where the input signal may vary over a wide range. Several articles have been written covering methods of controlling transistor gain in intermediate radio-frequency circuits.1,2 The usual method employed is to change one of the transistor parameters by the application of an external signal. The two basic methods of gain control indicated are: 1. Emitter current (Ie) control. 2. Collector voltage (Vc) control.

Published in:

American Institute of Electrical Engineers, Part I: Communication and Electronics, Transactions of the  (Volume:79 ,  Issue: 6 )

Date of Publication:

Jan. 1961

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