Electronic telephone set with low power hook switch

Details Electronic telephone set with low power hook switch Electronic telephone set with low power hook switch

1993-10-13

1995-03-21

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379362, 379359, H04M 131

Patent

active

054003989

ABSTRACT:
A subscriber set includes two line terminals, and electronic telephone set circuit, and a hook switch for switching the line current. A microswitch may suffice because the subscriber set comprises a series combination of a main current path of a first transistor and the telephone set circuit coupled to the line terminals, in that the subscriber set includes one resistor connected at least in parallel with the main current path of the first transistor and used for supplying power to at least part of the electronic telephone set circuit if the first transistor is non-conducting and in that the hook switch in a first status is arranged for coupling one of the line terminals to the control electrode of the first transistor via said part of the electronic circuit so as to render the first transistor conductive and, in a second status, for coupling the other line terminal to the control electrode of the first transistor by way of said part of the electronic circuit so as to render the first transistor non-conductive.

REFERENCES:
patent: 4815126 (1989-03-01), Goode et al.
patent: 4887295 (1989-12-01), Jenkins
patent: 5003578 (1991-03-01), Lin
patent: 5191606 (1993-03-01), Juang
Philips Data Handbook "IC's for Telecom Subscriber Sets, Cordless Telephones, Mobile/Cellular Radio Pagers CA 3089 to PDC 4413" Bock ICO3a, 1991.

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