Posted on Jul 27, 2012

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.

Click here to download the full size of the above Circuit.

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

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