Telephone solid state ringer

Details Telephone solid state ringer Telephone solid state ringer

1977-08-09

1979-08-07

Claffy, Kathleen H.

H04M 126

Patent

active

041638735

ABSTRACT:
The following specification discloses and teaches a solid state ringer or audible alarm for a telephone. The ringer can be connected to the tip and the ring sides (i.e., plus and minus terminals) of a telephone network in the home, or any other location. The ringer incorporates a rectifying bridge and a two terminal current regulator for providing current to the network on a regulated basis to eliminate undue irregularities on the line. The ringer can be rung on a duty cycle similar to a mechanical bell by means of charging a capacitor that discharges in accordance with the duty cycle of the mechanical ringer. The cycle is established through a timing network formed with a resistor within the timing loop incorporating the capacitor. The capacitor is discharged to power a speaker through a switching network by means of three transistors that provide a switching function. The discharge provides a voltage across an oscillatory network that allows a unijunction transistor to operate a speaker. The speaker is provided with a given voltage on an oscillatory basis within the range of eight hundred cycles per second during a duty cycle that would normally be the standard duty cycle of a telephone ring in an on and off relationship as to the sound thereof, thus providing a pleasant tone analogous to a mechanical ringer.

REFERENCES:
patent: 3688038 (1972-08-01), Hugyecz
patent: 3808379 (1974-04-01), Lind
patent: 3849606 (1974-11-01), Roberge
patent: 3864532 (1975-02-01), Van Der Plaats
patent: 3867585 (1975-02-01), Morstadt
Electronic Design, vol. 24, No. 22, Oct. 25, 1976, p. 194, H. MacDonald, "Circuit Monitors Blinking Phone Lights and Provides Soft but Commanding Tone."

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