ULTRASONIC_PEST_REPELLER_I

Published:2009/7/11 2:06:00 Author:May | From:SeekIC

An NE555 timer is used to generate an ultrasonic signal in the 20- to 65-kHz range. The speaker is a small piezoelectric tweeter with response above 20 kHz. These frequencies are said to be annoying to rats. mice. and insects.



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