1978-08-10
1980-05-13
Konick, Bernard
179 18FA, 179 70, H04M 1906
Patent
active
042030099
ABSTRACT:
A balanced/unbalanced converter circuit for connection to a subscriber's telephone line. A first Darlington transistor pair is connected as a controllable impedance between a first supply terminal and a first balanced input/output terminal. A second Darlington transistor pair is likewise connected between a second supply terminal and a second balanced terminal. A potential-summing resistive network is connected between the balanced terminals and the sum-representative potential is compared with a reference to provide a control signal to simultaneously change the impedances in opposite directions to correct any departure from balance. A third transistor controllable impedance circuit is connected in series with one Darlington transistor pair and used to regulate direct current flow through the line.
REFERENCES:
patent: 3886322 (1975-05-01), Colardelle et al.
patent: 4007335 (1977-02-01), Hetherington et al.
patent: 4041252 (1977-08-01), Cowden
patent: 4086447 (1978-04-01), Schindler et al.
patent: 4087647 (1978-05-01), Embree et al.
Konick Bernard
Myers Randall P.
The Post Office
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