Power input verification wanted

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before hook up, wanted confirm can hook 12v uno r3 on vin , adjacent ground.  won't affect arduino negatively it?  5v output still remain 5v correct?

as far can see vin bypasses reverse polarity protection diode should ok. might safer suitable plug , plug "power in" jack , diode protection well.

and yes, 5v after voltage regulator should still 5v.


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