Telephone ringing circuit

Details Telephone ringing circuit Telephone ringing circuit

1980-06-10

1982-11-16

Popek, Joseph A.

H04M 100

Patent

active

043596100

ABSTRACT:
An improved telephone ringing circuit in which a ringing circuit is connected with a triac to allow an entry of ringing signals which are rectified by a full-wave rectifier connected in series with the triac. The D.C. voltage is being supplied to a sound producing device such as an oscillation circuit coupled with a speaker. The ringing circuit is also provided with a variable resistor for adjusting the D.C. voltage and a variable resistor in the oscillation circuit for adjusting the frequency of the A.C. output signals delivered by the oscillation circuit to the speaker.

REFERENCES:
patent: 3218395 (1965-11-01), Suda
patent: 3466403 (1969-09-01), Combridge

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