Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1977-02-04
1978-07-11
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
With particular system function
307279, 331108C, 340574, 340584, 340384E, G08B 1900
Patent
active
041005430
ABSTRACT:
The alarms circuit provides a first signal indicative of a fire alarm and a second signal indicative of another intrusion such as a burglary. The circuit includes a high frequency RC oscillator which undesireably possesses a duty cycle different from fifty percent. The oscillator output is divided by a bistable multivibrator to produce at an output, a divided signal having a fifty percent duty cycle for application to a loud speaker to energize the same efficiently due to the proper duty cycle. In a burglary mode, the oscillator frequency is modulated by a sawtooth developed by a second bistable multivibrator to provide a wailing tone signal indicative of a burglary. This signal is also divided to produce a proper duty cycle signal for application to the loud speaker.
REFERENCES:
patent: 3794934 (1974-02-01), Rhee
patent: 3992973 (1976-11-01), Howell
Cousino, R. E. "IC Doorbell Plays Your Song" Radio-Electronics, vol. 46, No. 9, pp. 33-35, New York.
Scholten, J. W. "IC-Incorporated MOS Oscillators. . ." Components Report, vol. 10, No. 5, pp. 129-133, Germany.
Edwards, D. "Digital Metronome with Accented Beat "Electronics Australia, vol. 38, No. 4, pp. 40-41, Australia.
Stockdale Roy
Weston Lance
Napco Security Systems, Inc.
Plevy Arthur L.
Swann III Glen R.
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