Electronic tone ringer control circuit for a telephone set

Details Electronic tone ringer control circuit for a telephone set Electronic tone ringer control circuit for a telephone set

1977-10-03

1978-08-15

Claffy, Kathleen H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 91, H04M 100

Patent

active

041074769

ABSTRACT:
A circuit for controlling the on-off ringing of a line powered electronic tone ringer in a telephone set. The circuit, which includes a variable rate charge-discharge suppression circuit, effectively prevents up to 300 volt peak, 12 Hz transient spikes on the line from actuating the tone ringer, yet still responds to a 35 volt RMS, 18 Hz ringing signal.

REFERENCES:
patent: 3860764 (1975-01-01), Martin
patent: 3965307 (1976-06-01), Dimmer

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