Electronic tone ringer

Details Electronic tone ringer Electronic tone ringer

1977-09-14

1979-02-20

Claffy, Kathleen H.

H04M 100

Patent

active

041408845

ABSTRACT:
An electronic tone ringer for a telephone set produces a tone in response to the presence of a conventional a.c. ring signal between the tip and ring leads of the telephone set. The electronic tone ringer rectifies the ring signal to produce a d.c. voltage. The resulting d.c. voltage is connected to a sounding device through a timing circuit which filters out short duration line transients.

REFERENCES:
patent: 3278687 (1966-10-01), Everett
patent: 3466403 (1969-09-01), Combridge

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