Electronic audio signalling device for telephones

Details Electronic audio signalling device for telephones Electronic audio signalling device for telephones

1978-12-18

1980-07-22

Fears, Terrell W.

H04M 100

Patent

active

042141311

ABSTRACT:
A signalling device to be substituted for the usual electromechanical ringer of a telephone, either as a replacement for that ringer in existing telephone instruments or as a part of the original manufactured instrument. It includes solid-state circuitry for eliminating noise pulses and an electronic oscillator circuit which will operate effectively on a minimum current supply along with a mechanical arrangement of components to obtain a compact unit with a folded horn or Helmholtz resonator type acoustical loading system and adjustable volume control.

REFERENCES:
patent: 1884724 (1932-10-01), Keller
patent: 2808463 (1957-10-01), Jenkins
patent: 3826333 (1974-07-01), Buckwalter
patent: 3860838 (1975-01-01), Kumon
patent: 3867585 (1975-02-01), Morstadt
patent: 4157459 (1979-06-01), Bush et al.

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