Variable loop telephone transmission circuit

Details Variable loop telephone transmission circuit Variable loop telephone transmission circuit

1978-12-29

1980-12-09

Moffitt, James W.

H04M 158

Patent

active

042386454

ABSTRACT:
A subscriber station telephone circuit having a multiwinding transformer connected in a bridge configuration to couple the transmitter to the line and the balancing impedance in opposite phase. The receiver is magnetically coupled by the transformer so as to receive practically no side-tone during transmission. A varistor is employed as a regulator to control receiver signals.

REFERENCES:
patent: 3517138 (1970-06-01), Burger

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