Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1989-01-27
1990-05-29
Orsino, Joseph A.
Communications: electrical
Audible indication
Ultrasonic pest control
307 101, 331107R, 340441, G08B 300
Patent
active
049299247
ABSTRACT:
In an electronic horn for alarm systems of the type in which an alarm condition is indicated by a reversal of polarity in the d.c. power supply, an improvement provides a pair of terminals for connection to said d.c. power supply, a series circuit including a current limiting element and a capacitor connected across said terminals, a speaker operable to produce sound in response to current flow through the speaker, the speaker being constructed so that it will reverberate for a period after the current flow through the speaker has stopped and switch means for connecting the speaker in parallel to said capacitor for the discharge of energy stored in the capacitor through the speaker when the switch means is in its conductive state with means for continuously cycling the switch means between its conductive and non-conductive states at a predetermined frequency and for a predetermined duration of "on" time for each switch cycle such that the sound produced by the pulses combines with that produced by reverberation of the speaker to provide a continuous tone as long as said pair of terminals is connected to the power source in the polarity indicative of an alarm condition.
REFERENCES:
patent: 3707716 (1972-12-01), Goralnick
patent: 4083037 (1978-04-01), Larsen
patent: 4246572 (1981-01-01), Larsen
patent: 4274084 (1981-06-01), Haus
patent: 4499453 (1985-02-01), Right
patent: 4558305 (1985-12-01), Black et al.
patent: 4567806 (1986-02-01), Kodaira
patent: 4594573 (1986-06-01), Yoshino et al.
patent: 4689609 (1987-08-01), Ko et al.
patent: 4742328 (1988-05-01), Arai et al.
patent: 4792789 (1988-12-01), Matsumuro
Buyak William P.
Right Robert W.
Testa Bruce V.
General Signal Corporation
Hubbard Robert R.
Miller William G.
Orsino Joseph A.
Swarthout Brent A.
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