Ultrasonic-pest-controller

  
This circuit consists of two basic parts: an oscillator tuned to 40kHz, and a voltage doubler with pulse generator. The pulses are about 10 ms long and occur 2-3 per s to reduce battery drain and increase the annoyance factor for a cat, dog, hedgehog, etc.
Ultrasonic-pest-controller - schematic

The voltage doubling action increases the available output power for any given battery voltage.




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