1977-05-26
1979-02-13
Cooper, William C.
179 99, 328181, H04M 100
Patent
active
041397401
ABSTRACT:
A circuit for detecting ringing signals on a telephone line in which the alternating voltage oscillations are converted to direct current pulses which are used to charge a first capacitor. Only signals of 14 hertz or above are sufficient to repetitively charge the first capacitor to a high enough voltage to open continuously a grounding circuit through a comparator, thus, allowing a second capacitor to charge up and open a second grounding circuit thus permitting current to flow to a suitable output. The output is used to activate lights on the telephone which lights are either flashed or winked by a unique resistance balanced solid state flash or wink generator.
REFERENCES:
patent: 3569842 (1971-03-01), Schroyer
patent: 3739104 (1973-06-01), O'Neill
patent: 3916117 (1975-10-01), Matheny
patent: 3953683 (1976-04-01), Gabrielson
patent: 3963957 (1976-06-01), Knollman
Cooper William C.
Magnetic Controls Company
Popek Joseph A.
Schulte Neil B.
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