On my breadboards it switches the battery in/out of the circuit when I plug
in a wall Wart.

John Ferrell
http://DixieNC.US

----- Original Message -----
From: "Colin Constant" <colinpiclist@HOTMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, March 07, 2004 12:31 AM
Subject: [EE ]: 3rd pin on barrel connector?


> 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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