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If an external voltage of 7 volts is applied to the external voltage input on the Arduino and the power from the USB port remains connected, is there a protective circuit that will protect the Arduino? Thank you.

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  • Protect it from what?
    – Majenko
    May 15 '16 at 0:19
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yes there is. power will be drained from external source(altough 7 volts is around the limit and arduino may switch to usb power) and arduino will still operate at 5v, same as usb. in any case your arduino and usb will be safe.

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    The opamp that turns off the mosfet, to disable USB-Vcc, is set to 6.6Volt.
    – Gerben
    May 15 '16 at 8:36
  • glad to help. Generally speaking, if a given answer satisfies you then you should mark it as accepted. See also faq about accepting answers. Thank you
    – foivaras
    May 15 '16 at 15:09

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