Constant current detector system

Details Constant current detector system Constant current detector system

1975-06-23

1976-11-09

Swann, III, Glen R.

Communications: electrical

Systems

Call station

340409, 340421, G08B 2100

Patent

active

039914135

ABSTRACT:
A constant current generator supplies a constant current signal to a plurality of detector means via an output and ground return line. The detector means include an electrical resistance in series circuit in the output line and a sensor connected between the ground return line and the output line optionally subsequent in electrical circuit to the resistance. The sensor means becomes electrically conductive in the presence of a stimulus. As a result, the total resistance and in turn the voltage at the output of the constant current generator changes to a predictable value indicative of the identity of the conducting sensor. A detector circuit senses the change in voltage and sends a detection signal to activate operation means.

REFERENCES:
patent: 2003443 (1935-06-01), Henneberger
patent: 2233923 (1941-03-01), Maughmer
patent: 3550120 (1970-12-01), Kompelien
patent: 3603949 (1971-09-01), Walthard
patent: 3832678 (1974-08-01), Gysell et al.

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