Telephone ringer isolator circuit arrangement

Details Telephone ringer isolator circuit arrangement Telephone ringer isolator circuit arrangement

1980-04-23

1982-05-25

Brigance, Gerald L.

179 84R, H04M 302, H04M 1300

Patent

active

043318380

ABSTRACT:
A telephone ringer isolator includes an electronic switch which enables it to operate at reduced ringer voltages. In the ringer isolator, the central office ringing signal is rectified and voltage doubled across a circuit containing two diodes and two capacitors. The second capacitor is connected across a neon tube. When the voltage across the second capacitor rises to a preselected value, the neon tube is fired to emit light onto a light sensitive resistor which feeds gate current to a Triac to turn the Triac on. The Triac, in turn, grounds the telephone ringer.

REFERENCES:
patent: 2790851 (1957-04-01), Berch
patent: 2824174 (1958-02-01), Holman
patent: 2824175 (1958-02-01), Meacham et al.
patent: 3145266 (1964-08-01), 179
patent: 3223788 (1965-12-01), Hawley et al.
patent: 3230316 (1966-01-01), Hunt
patent: 3849605 (1974-11-01), Russell
patent: 3916111 (1975-10-01), Ott
patent: 4021617 (1977-05-01), Jones, Jr. et al.
patent: 4031332 (1977-06-01), Shylo
patent: 4143287 (1979-03-01), Biggs

Affiliated with

Also associated with

Rating

Telephone ringer isolator circuit arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Telephone ringer isolator circuit arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telephone ringer isolator circuit arrangement will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2077991