Telephone set ringing current injection device
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United States of America Patent
Stats
-
Dec 15, 1981
Grant Date -
N/A
app pub date -
Sep 14, 1979
filing date -
Sep 19, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telephone set line circuit ringing current injection device having a hybrid circuit in which each feed wire is connected in series with a resistor, and a stage consisting of a diode connected in parallel with the collector-to-emitter circuit of a transistor. The cathode of one diode is connected to the collector of the transistor on the side of one of the feed wires, the anode of the other diode and the emitter of the other transistor are connected to the other wire.
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