Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1975-04-24
1976-03-23
Pitts, Harold I.
Communications: electrical
Audible indication
Ultrasonic pest control
340384R, H04G 310
Patent
active
RE0287458
ABSTRACT:
The invention is an electronic siren comprising in combination means for generating periodically occurring charging pulses at a selected one of a plurality of predetermined repetition rates, time-constant determining means coupled to the pulse generating means for generating a repeating voltage wave form in response to the charging pulses and means coupled to the time-constant determining means for generating a square wave signal having a frequency proportional to the instantaneous voltage of the voltage wave form. Coupled to the square wave generator is an output circuit which includes a first pair of transistors and first circuit means coupling the transistors to the square wave generator for driving the first pair of transistors individually and alternately into saturation in response to the aforementioned square wave signal. There are also provided a second pair of transistors and second circuit means coupling the second pair of transistors to the first pair of transistors for driving the second pair of transistors individually and alternately into saturation in synchronism with saturation of the first pair of transistors.
REFERENCES:
patent: 3284796 (1966-11-01), Borsattino
patent: 3460136 (1969-08-01), Jambazian
patent: 3493966 (1970-02-01), Human
patent: 3504364 (1970-03-01), Abel
patent: 3613003 (1971-10-01), Kubo
Carson Manufacturing Company, Inc.
Pitts Harold I.
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