I would like to mount my arduino on a breadboard and be able to power my external circuitry with an external power supply. I realize that I can power it by taking 5v off of the Arduino board but I am considering isolating the circuit draw from the Board. So, I am assuming that s common supply must supply both (my circuit and the arduino) Is this as simple as it seems to me? One big supply feeding the Decimilia board and the breadboard both? I can feed the 5v right to the board, right?