I had to power up the Hobo U30 Datalogger by letting its 4.2V SLE battery run for more than the half year it normally lasts. The only power source available was commercial 277/480V AC. It's hard to find a dollar that can handle this high input voltage. The module broke, and upon inspection it turned out that a leg of a small capacitor had moved away. We soldered it again and it worked. I order three more.
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