Current detector circuit
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United States of America Patent
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-
Jan 12, 1982
Grant Date -
N/A
app pub date -
Nov 27, 1979
filing date -
Jun 21, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A current detector circuit, preferably for use in telephone equipment, to detect the on-hook and off-hook conditions of of such equipment, includes two equal transformers which have primary coils mounted in series and secondary coils mounted in series opposition, but in series with a circuit within which it is desired to detect the current. The primary coils constitute the load of the collector of an NPN transistor. Such collector is connected by means of a resistor to the base of a PNP transistor.
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