| 摘要 |
A wide angle frequency automatic scanning ultrasonic animal chaser for scaring away straying cats and dogs includes a case, an end plate, a water resistant cover and an ultrasonic oscillation circuit held in the case. The case and the end plate are housed in the cover by means of ridges and troughs without using hand tools. The ultrasonic oscillation circuit includes a divider and a stable multivibrator circuit for generating ultrasonic oscillation frequency and emitting through a perforated plate located at a front end of the case. The oscillation circuit provides an automatic scanning frequency function to effectively scare away straying cats and dogs nearby. This device consumes little power and is easy to install and use.
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