Ringer circuit

Details Ringer circuit Ringer circuit

1994-12-27

1995-08-15

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379373, 379377, H04M 126

Patent

active

054426952

ABSTRACT:
A ringer circuit includes a rectifier unit receiving a calling alternating voltage and having first and second output terminals. An acoustic transducer has first and second terminals. A controllable first switch is connected between the first output terminal of the rectifier unit and the first terminal of the acoustic transducer. A controllable second switch is connected between the first and second terminals of the acoustic transducer. A capacitor is connected between the second terminal of the acoustic transducer and the second terminal of the rectifier unit. A switch control is supplied from the capacitor for opening and closing the first and second switches in alternation and in phase opposition to one another as a function of the calling alternating voltage.

REFERENCES:
patent: 4107476 (1978-08-01), Henderson
patent: 4140884 (1979-02-01), Duimet et al.
patent: 4163873 (1979-08-01), Phelps
patent: 4315109 (1982-02-01), Jacobson
patent: 4346265 (1982-08-01), Buss et al.
patent: 4658419 (1987-04-01), Denen

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