Electronic side of line detector

Details Electronic side of line detector Electronic side of line detector

1974-09-27

1976-02-17

Claffy, Kathleen H.

H04M 1536

Patent

active

039393089

ABSTRACT:
A side of line detector with a single operational amplifier with adjustable output. The amplifier input is protected from positive and negative voltage spikes by diodes. Two transistors are coupled to the amplifier to set a comparator voltage reference which allows the rejection of leakage and noise. Test points are provided in the circuit to facilitate testing particular subcircuits and to allow the initial adjustment of the detector.

REFERENCES:
patent: 2277623 (1942-03-01), Allen
patent: 3622709 (1971-11-01), Tjaden
patent: 3748395 (1973-07-01), Herter
patent: 3808377 (1974-04-01), Young
patent: 3812303 (1974-05-01), Stewart
patent: 3821486 (1974-06-01), Mussman

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