A look inside one of the many controversial ultrasonic pest repellers. These things claim to repel rodents and insects from your home by creating an ultrasonic noise that disturbs them.

The PCB in this unit looks very competently designed, with good clearances and logical design. The bulk of the units magic is in the software, and they've been quite clever in creating a swept ultrasonic output, while also pulse width modulating the indicator LED. It could even be said that the programmer may have been showboating.

I scoped the output of this unit by powering it from a 5V supply. I was expecting a fast ramping ultrasonic siren, but it's different.

The power consumption of the unit is very low at around 0.15W. A guestimate of the power factor is 0.02 which is close to just having a suppression capacitor across the mains supply.

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