Circuit for the protection of telephone lines
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United States of America Patent
Stats
-
Mar 3, 1981
Grant Date -
N/A
app pub date -
Dec 12, 1977
filing date -
Dec 20, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Arrangement for protecting telephone lines and electronic circuits connected thereto from overvoltages. A first pair of diodes clamp the voltage of each wire versus the supply voltages in cooperation with a current limiting impedance. A second pair of (Zener-) diodes, separated from the first diode pair by means of a current limiting impedance, clamp the forward 'transient' produced across the first diode pair versus the same or slightly different supply voltages.
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