Communications – electrical: acoustic wave systems and devices – Transmitter systems – Animal control
Patent
1982-01-19
1986-01-21
Blum, Theodore M.
Communications, electrical: acoustic wave systems and devices
Transmitter systems
Animal control
116 22A, 340384E, H04B 102, G08B 310
Patent
active
045660859
ABSTRACT:
A high intensity ultrasonic sound generator for producing bursts of ultrasonic frequency and a method of controlling vermin and pests by projecting such bursts into a space from which such vermin and pests are desired to be eradicated. The apparatus has a transformerless power supply employing a voltage divider with a low leakage input capacitor and an output capacitor having a significantly larger capacitance than that of the input capacitor, and wherein the load is voltage dependent so that the greater the charge on the output capacitor, the greater the load and, therefore, the output capacitor is prevented from excessively charging. Ultrasound frequency is generated by two astable multivibrators one of which duty cycles the other and means are provided to vary the frequency within each burst and the burst interval. Means are provided, including parallel LC network with the transducer, which may be set to resonance, in order to reduce unwanted audio, and also including means for rounding the envelope of the bursts of ultrasonic frequency. The speaker includes a free floating cone, with no other mechanical connection than its mechanical connection to the transducer.
REFERENCES:
patent: 3683113 (1972-08-01), Stewart
patent: 4297538 (1981-10-01), Massa
patent: 4338593 (1982-07-01), Mills
patent: 4392215 (1983-07-01), Hall
Markus, John; Guidebook of Electronic Circuits; 1974; pp. 661-673.
"An Ultrasonic UCS" by E. Kent and S. P. Grossman, Physiological Behavior 3(2), pp. 361-362 (1968).
"Some Examples of Ultrasonic Frequency Sensitive and Frequency Insensitive Biological Reactions" by R. G. Busnel.
Blum Theodore M.
Issing Gregory C.
Wein Products, Inc.
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