Just wonderin what the 3rd pin on a typical power barrel connector is
typically used for? This is the pin that connects to the center pin when
there's no plug and it's not connected when there's a plug.

In the past I've just left it NC, but I wonder if it should be used to
ground the + input to the power supply.  There's a 7805 and a couple of 2200
uF caps on this line.

And yes, it is 10:30 Saturday night; and no, I don't have a life :-)

Colin

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