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Thanks for the fast reply! Sounds about right... I will most likely just scrap them.

One more thing I should have mentioned is that I can here an audible frequency from the USB hub powering a few...

Hi all. I have a small (5 boards) but ever growing collection of Teensy 4.0s that I have destroyed, almost certainly all of them are from over voltage on digital inputs.

Today I took a look at...