Title: Control circuit for use with amplifier

Abstract: A control circuit for use with an amplifier is disclosed which includes an amplifier circuit having an input transistor, a driving transistor and an output transistor, a negative feedback circuit consisting of a parallel connection of a capacitor and a resistor and connected between the output terminal of the output transistor and the base of the driving transistor of the amplifier circuit. It also includes a transistor having its collector and emitter connected to the negative feedback circuit, a charging and discharging circuit connected to the base of the last mentioned transistor, and a voltage source connected to the charging and discharging circuit through a switch. The operation of the amplifier circuit is controlled by instantly making the switch on through the charging and discharging circuit and the transistor.

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Inventors: Okanobu, Taiwa (Tokyo, JA)

Application Number: 464034
Filing Date: 1974-04-25
Publication_date: 1976-02-10
Assignee: Sony Corporation (Tokyo, JA)
Primary Class(es): 455/231 330/86, 330/281, 330/282, 968/596, 968/DIG1
Other Classes:
US Patent Ref:

3454892	Jul, 1969	Knowles	330/29.
3737794	Jun, 1973	Kurz	330/9.
3806818	Apr, 1974	Uchivama	325/455.

Other Refs:
Primary Examiner: Safourek, Benedict V.
Assistant Examiner: Hearn, Robert
Attorney: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson