Opto-coupler interfacing circuit

Details Opto-coupler interfacing circuit Opto-coupler interfacing circuit

1983-10-03

1985-12-10

Dwyer, James L.

179 81R, 179 18FA, H04M 322

Patent

active

045581835

ABSTRACT:
A circuit for interfacing a telephone system, such as a cordless telephone, to telephone lines by the use of opto-couplers, arranged to establish a telephone line loop upon detecting a ringing signal on the telephone lines. Preferably, three opto-couplers are used in varying combinations to provide a standby condition, ringing detection, ringing detection shut-off, telephone line loop connection, incoming audio, and outgoing audio functions. Such a circuit eliminates the use of transformers and relays, while meeting regulations.

REFERENCES:
patent: 3410961 (1968-11-01), Slana
patent: 3848094 (1974-11-01), Russell
patent: 4056719 (1977-11-01), Waaben
patent: 4093830 (1978-06-01), Pappas
patent: 4282604 (1981-08-01), Jefferson
patent: 4287392 (1981-09-01), Melindo
patent: 4313225 (1982-01-01), Carbrey et al.
patent: 4495383 (1985-01-01), Lubin

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