Multiple tone signaling device

Details Multiple tone signaling device Multiple tone signaling device

1982-12-20

1985-12-10

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, 331 47, G08B 300

Patent

active

045583056

ABSTRACT:
A multiple tone signaling device provides a piezoelectric transducer, first, second and third oscillator circuits, a first input terminal for enabling either or both of the first and second oscillator circuits, circuitry coupling the third oscillator circuit to the first and second oscillator circuits for disabling either the first or second oscillator circuits in response thereto, and a second input terminal coupled to the third oscillator circuit for allowing control of the output of said third oscillator circuit.

REFERENCES:
patent: 3416065 (1968-12-01), Redfern
patent: 3774148 (1973-11-01), McIntosh
patent: 3868684 (1975-02-01), Nunn
patent: 3875526 (1975-04-01), Beeman et al.
patent: 4088995 (1978-05-01), Paladino
patent: 4193060 (1980-03-01), Slavin et al.
patent: 4257036 (1981-03-01), Slavin et al.
patent: 4374377 (1983-02-01), Saito et al.
"Hee-Haw Siren for Toy Cars", Gerald Cohn, Electronics, Jun. 1980, pp. 77-79, vol. #42.
"Multi-Option Siren", Ray Marston, Electronics Today Inc., vol. 10, Jan. 1981, pp. 22-24.
"Linear IC Siren Warbles, Wails, Sweeps", Tom Hopkins, Electronic Design, vol. 28, No. 17, pp. 190-192, Aug. 16, 1980.

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