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Ultrasonic Pest Repeller I

2017-09-08 11:39  
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An NE555 timer is used to generate an ultrasonic signal in the 20- to 65-kHz range. The speaker is a small piezo
Ultrasonic Pest Repeller I

electric tweeter with response above 20 kHz. These frequencies are said to be annoying to rats, mice, and insects.

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