Pest animal repulsing apparatus

Details Pest animal repulsing apparatus Pest animal repulsing apparatus

1997-02-11

2000-08-15

Hofsass, Jeffrey

Communications: electrical

Audible indication

Ultrasonic pest control

3403841, 3403847, 367139, 381 85, 381123, G08B 310

Patent

active

061042838

ABSTRACT:
The apparatus according to the present invention is provided with two or more output systems to which transducers are connected, a source output on/off control unit that turns on/off the output from a source based upon the output from a random signal generating unit and a frequency varying unit that causes changes in the frequency of an electrical signal provided to the transducers over time at a specific rate. Every time the source output is turned off, the output of the electrical signal is stopped and the output systems are switched over, whereas when the source output is on, the electrical signal provided to the transducers on the output system to which the signal is to be provided. Since the output systems are switched over to be selected for use, it becomes possible to connect a greater number of transducers while using the same source capacity as in the prior art and noise generated from the transducers, when switching over the output systems, is eliminated.

REFERENCES:
patent: 3636559 (1972-01-01), Del Grande et al.
patent: 3893106 (1975-07-01), Schulein
patent: 4563759 (1986-01-01), Hayakawa
patent: 5602523 (1997-02-01), Turchioe et al.

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