Current detector circuit

Details Current detector circuit Current detector circuit

1979-11-27

1982-01-12

Robinson, Thomas A.

H04M 322

Patent

active

043107249

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.

REFERENCES:
patent: 3835258 (1974-09-01), Le Cardonnel

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