https://radiokot.ru/circuit/digital/security/44/
According to current tests,
when the frequency is adjusted from sharp high frequency to almost inaudible to adult male ears, women and children will protest very loudly at this frequency.
After that, when the frequency is increased, they will no longer protest. The frequency is basically close to the frequency we need. At this time, without an oscilloscope,
measure the voltage at both ends of the probe to make it as high as possible.
At this time, the ultrasonic generator can bend the flame. The little bitch that did not react before can now Will tilt his head curiously and avoid
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