I would like to know if anyone has a suggestion for a DC power supply for the Brain v2. The Wiki says that the jack wants 5 volts, but I see other pages that suggest it should be 12V. And it's tip-positive, correct? Does anyone know the size of the power jack, i.e. 5.5/2.5 or 5.5/2.1? At the moment I don't have access to the board, so I would like to get the power supply first, then take it to the installation to test. Let me know, thanks!