After a bit of poking, I found what looked to be a textbook quartz crystal resonant curve, but centered at 20 MHz rather than 10. This suggests there’s a divide-by-two in the driver circuit, perhaps to improve the duty cycle to a more perfect 50%. But more importantly, it suggests that neither the crystal itself, nor the electrical connections between it and the package (since I was probing at the package contacts and not the surface of the quartz), were the source of the failure.
But a robot vacuum is the only kind of device that regularly roves around your home. That gives this vulnerability a unique sense of foreboding, perhaps enough to provide the plot to a found footage horror film.
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Российская пенсионерка купила золота на 19 миллионов рублей14:50
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