Telephonic communications – Terminal – Switch or switch actuator structure
Patent
1995-08-01
1997-02-11
Brown, Thomas W.
Telephonic communications
Terminal
Switch or switch actuator structure
379377, 379387, 379412, H04M 100
Patent
active
056029144
ABSTRACT:
Device for limiting the working voltage for mechanical switches in telephony includes terminals for connection to a telephone line, a connection and power supply branch for a control circuit extending from a first terminal, the branch having a first switch, the cathode terminal of a first Zener diode and the source terminal of a first MOSFET transistor being connected to the output terminal of the first switch, the gate terminal of the first MOSFET transistor being connected, through the anode terminal of the Zener diode, to the first terminal. The current absorbed by the device may be adjusted.
REFERENCES:
patent: 4360710 (1982-11-01), Chaput et al.
patent: 4475012 (1984-10-01), Coulmance
patent: 4634814 (1987-01-01), Pommer, II
patent: 4715058 (1987-12-01), Lechner et al.
patent: 4847899 (1989-07-01), Hikida
patent: 4887295 (1989-12-01), Jenkins
patent: 4896352 (1990-01-01), Dabin
patent: 5121425 (1992-06-01), Reichelt
European Search Report from European Patent Application No. 93102240.4, filed May 10, 1993.
Andreini Antonio
Consiglio Pietro
Erratico Pietro
Ravanelli Enrico M. A.
Brown Thomas W.
Chiang Jack
Driscoll David M.
Morris James H.
SGS--Thomson Microelectronics S.r.l.
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