Bridge amplifier

Details Bridge amplifier Bridge amplifier

1979-03-15

1981-08-25

Konick, Bernard

179 1A, 179 81B, 179170R, H03F 362

Patent

active

042861233

ABSTRACT:
A four-transistor bridge amplifier is adapted for use as a bidirectional speech amplifier between a telephone line and an electronic telephone subscriber's instrument. The amplifier is powered from the line and includes two-transistor sections, one or other of which functions dependent on line polarity. The output of the amplifier to the subscriber instrument is taken across a resistor connected between the transistors such that the output always has the same relative polarity whatever the line polarity.

REFERENCES:
patent: 3175050 (1965-03-01), Oxman
patent: 3238310 (1966-03-01), Wells
patent: 3359378 (1967-12-01), Skeer
patent: 3529099 (1970-09-01), Ribner
patent: 3573402 (1971-04-01), Chambers, Jr.
patent: 3882274 (1975-05-01), Vice et al.
patent: 4004091 (1977-01-01), Marley et al.

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