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Disable USB power without modifying the board. - General Electronics - Arduino Forum
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Chapter 7 - Arduino - Options for Powering Your Board - YouTube
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![arduino:external-power-supply [fryktoria.com]](https://wiki.fryktoria.com/lib/exe/fetch.php?w=800&tok=0ac341&media=arduino:arduino_nano_power_circuit.jpg "arduino:external-power-supply [fryktoria.com]")