Input circuit of audio amplifier

Details Input circuit of audio amplifier Input circuit of audio amplifier

1980-01-31

1982-03-02

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

333214, H03F 3183, H03H 1100

Patent

active

043180540

ABSTRACT:
In an audio amplifier circuit in which the base of a bipolar transistor of a first-stage amplifier circuit is direct-coupled to an input terminal which is connected to a signal source such as a phono pickup cartridge, a parallel circuit of a resistor and an inductor is connected between the base of the bipolar transistor and ground. An equivalent inductance circuit for embodying a pure inductance is disclosed.

REFERENCES:
patent: 3571761 (1971-03-01), Meek
patent: 4001711 (1977-01-01), Knutson et al.
Mitra, Sanjit, "Synthesizing Active Filters", IEEE Spectrum, Jan. 1969, pp. 47-63.

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