Signal switching circuit for multiple sound siren system

Details Signal switching circuit for multiple sound siren system Signal switching circuit for multiple sound siren system

1975-11-05

1977-10-18

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 300

Patent

active

040548694

ABSTRACT:
A circuit for switching between two signals of different frequency, such as "wail" and "yelp" of an electronic siren, by switching between different capacitive values in a multivibrator circuit. A monostable switch couples a reference level voltage to an integrated flip-flop circuit. The integrated circuit receives a reference level pulse when the monostable switch is closed and supplies a switching voltage to a transistor circuit. The transistor circuit places capacitances in parallel to change the time constant of the multivibrator circuit and also to change the characteristics of wave-shaping circuitry coupled to the multivibrator circuit. A reference level circuit accepts either of two voltage levels and provides a reference level voltage.

REFERENCES:
patent: 2910688 (1959-10-01), Kelley et al.
patent: 3810169 (1974-05-01), Locke
patent: 3868684 (1975-02-01), Nunn, Jr.

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