Electric two-to-four wire conversion circuit for use in telephon

Details Electric two-to-four wire conversion circuit for use in telephon Electric two-to-four wire conversion circuit for use in telephon

1976-03-17

1977-08-02

Claffy, Kathleen H.

H04B 158

Patent

active

040397661

ABSTRACT:
An electronic replacement for a telephone transformer for connecting a two-wire circuit to a four-wire circuit comprises a first differential amplifier having a constant gain feedback loop. The feedback loop comprises an opto-electronic coupler and a second differential amplifier. A DC source connected to the first differential amplifier by a switch produces biasing current for a photo transistor in the opto-electronic coupler. A DC supply to the line on the two-wire side is provided by a source connected to the wires by transistor circuits connected as active reactances.

REFERENCES:
patent: 3987257 (1976-10-01), Place

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