Pest eliminator

Details Pest eliminator Pest eliminator

1979-07-30

1981-08-18

Konick, Bernard

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340384E, G08B 300

Patent

active

042848458

ABSTRACT:
A device for freeing an area of birds, insects, or other pests which simultaneously emits two separate audio frequencies which are shifted periodically. The device comprises two separate oscillators whose output signals are mixed together at the input of a power amplifier driving a loud speaker. The frequency of each oscillator can be independently adjusted. A resistive load is placed in the common power supply line of the two oscillators and is periodically shunted in order to shift the frequency of both oscillators. The periodical shunting of the load is accomplished by a SCR switch driven by a third oscillator having a very low frequency. The resulting dual frequency pulsating signal can be adjusted with wide ranges of frequencies in order to deter various types of animals from frequenting the area.

REFERENCES:
patent: 3636559 (1972-01-01), Del Grande et al.
patent: 3683113 (1972-08-01), Stewart
patent: 3838418 (1974-09-01), Brown
patent: 3872472 (1975-03-01), Moschgat
patent: 3893106 (1975-07-01), Schulein
patent: 4001817 (1977-01-01), Squires
patent: 4186387 (1980-01-01), Moschgat

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