Electricity: power supply or regulation systems – Remote sensing
Patent
1974-09-12
1976-03-09
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
323 23, 323 39, H04M 1900
Patent
active
039434320
ABSTRACT:
An electronic feeding bridge for a telephone line uses a two-stage circuit to provide high a.c. impedance between the load and the line and between the line and the load. The first stage includes one NPN type transistor and one PNP type transistor with their bases coupled together by a capacitor. The second stage includes one PNP type transistor and one NPN type transistor with their bases coupled together by a capacitor. The emitters of the transistors of the first stage are connected to the emitters of the transistors of the second through of a pair of resistors. The collectors of the second stage are connected to the load through of a pair of diodes, and the collectors of the transistors of the first stage are connected directly to the line.
REFERENCES:
patent: 3097307 (1963-07-01), Bonn
patent: 3209205 (1965-09-01), Olson
patent: 3337748 (1967-08-01), Rusch et al.
patent: 3340404 (1967-09-01), Willems et al.
patent: 3649769 (1972-03-01), Pest
Colardelle Joel Serge
Comte Marie-Helene
Regnier Marc Andre
International Standard Electric Corporation
Lombardi, Jr. Menotti J.
Menelly R. A.
O'Halloran John T.
Pellinen A. D.
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