Variable characteristics amplifier circuit

Details Variable characteristics amplifier circuit Variable characteristics amplifier circuit

1985-07-10

1986-10-21

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

360 744, H03G 330

Patent

active

046188347

ABSTRACT:
A variable characteristics amplifier circuit such as may be used in an inter-music interval detecting circuit for a tape deck, record player, or the like. First and second transistors are connected in an emitter follower configuration with an input signal being applied to the base of the first transistor. One of the emitter or collector of the second transistor is connected through a series circuit of a capacitor and resistor to an inverting input terminal of an operational amplifier, and a feedback circuit is provided between this input terminal and the output of the operational amplifier. A capacitor is coupled between the selected one of the emitter and collector of the second transistor and its base.

REFERENCES:
patent: 4178482 (1979-12-01), Ouellette
patent: 4220931 (1980-09-01), Hines et al.

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