Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1982-02-26
1984-05-22
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330 86, 330282, 330284, H03G 330
Patent
active
044504136
ABSTRACT:
An automatic signal level control device has a variable impedance element whose impedance varies with the level of a control signal; a variable gain circuit whose gain varies with the impedance of the variable impedance element; and a detector for generating the control signal upon receipt of an output signal from the variable gain circuit. The detector includes a transistor whose base is supplied with a first signal corresponding to the output signal from the variable gain circuit and from whose emitter there is drawn out a second signal having a potential corresponding to that of the first signal; a feedback element which is connected between the base and emitter of the transistor; and a capacitor which is connected between the emitter of the transistor and a circuit having substantially no AC potential to store a charge corresponding to the second signal. A feedback signal corresponding to the charged potential of the capacitor is supplied to the base of the transistor through the feedback element, and the second signal is used as the control signal.
REFERENCES:
patent: 3725800 (1973-04-01), Papay
Caringella Electronics, Inc. ad for Audio Compressor Model ACA-1.
Mottola Steven J.
Mullins James B.
Olympus Optical Co,. Ltd.
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