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Re: prevent usb 5V backfeeding

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Drastic as it sounds, I would just cut the +5V trace on the board. There is absolutely no reason for the sanguino to be powering to usb line.

Cutting the trace takes 2 seconds with a pocket knife and costs nothing. Once cut, never have to worry about frying a usb port, blowing the 7805 or forgetting the adapter.

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