Ringing detector for use by the deaf

Details Ringing detector for use by the deaf Ringing detector for use by the deaf

1981-05-28

1983-04-05

Rubinson, G. Z.

179 81C, H04M 1102

Patent

active

043792103

ABSTRACT:
A ringing detector circuit for use by the deaf which may be connected between the tip and ring conductors (11, 12) of a subscriber set to cause an incandescent lamp (40) to flash to half brightness when ringing voltage is applied to the line. Closing a manual switch (22) allows the lamp (40) to burn at half brightness when the phone is not ringing and to flash to full brightness when the phone is ringing.

REFERENCES:
patent: 2131589 (1938-09-01), Halligan
patent: 2616972 (1952-11-01), McNutt
patent: 3585303 (1971-06-01), Chieffo
". . . By Persons With Physical Handicaps," C & P Publication, (Sep. 1966).
T. D. Towers and S. Libes, "Variable Control of A.C. with SCRs," Semiconductor Circuit Elements, (New Jersey: Hayden, 1977), pp. 167-169.

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