I am planning on setting up a not gate with a bc547 npn transister? (the lettering on it actually says "BC 5478 K6 E"). I was looking around and one website said most gates can only handle 20mA of current, and I plan on using 5v power from arduino, so 5v/.02= 250 ohm, so the resister value should be…

what resister values to use with a transister NOT gate?

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