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.
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然而，行程安排并非最大难题——横跨大西洋的联盟氛围才是核心议题。
Acting executive director for consumer protection Emma Cochraine warned suppliers against profiteering by hiking the price of heating oil for those who have already placed orders.
Motivation Behind Development