I note that the external supply may be between 6 and 12V dc.
I assume (but have been unable to find a reference that confirms this) that the centre electrode is +ve.
Neither have I been able to find out what the power dissipation limit of the on board regulator is as installed. Can anyone point me to reference sources that will help with either of these questions?
I am concerned that running Arduino UNO plus Ethernet off a 12 volt 2A wall wart will over heat the regulator in constant use,
and would therefore like to design my own lower voltage source that will ensure that the on board chip stays within its Arduino UNO board mounting recommended power dissipation limit.
My only concern then would be having a USB connected at the same time to use the monitor, and therefore potentially two power sources connected in parallel.