Patent
1976-05-03
1977-08-30
Olms, Douglas W.
179 18ET, H04M 322
Patent
active
040456234
ABSTRACT:
A matrix of electrical termination points arranged in pairs is provided with a detection circuit for detecting short circuits between termination points. A transistor circuit is associated with each pair of termination points. A connection is provided from one of the points in each terminal pair to the transistor base which is forward biased in the absence of short circuits. A collector-emitter connection is provided through the transistor to the other terminal point in the terminal pair. A current indicator responsive to the collector-emitter current is provided for each transistor circuit. When the transistor base is forward biased, a collector-emitter current actuates thecurrent indicator associated therewith. Short circuits between terminal points within a terminal pair greatly reduces collector-emitter current and short circuits between terminal points of different terminal pairs causes the base current of the transistor of at least one transistor circuit to be bypassed, thereby removing the forward bias current of that transistor. In both instances, the current indicator is deactuated.
REFERENCES:
patent: 3099720 (1963-07-01), Gotthardt
patent: 3725614 (1973-04-01), Slana
patent: 3863032 (1975-01-01), O'Dea et al.
patent: 3863034 (1975-01-01), Morrison
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