I was wondering about the 12v output. how does this work? cuse if you try to look up if a leonardo could send a 12V 3A true the board to control the motors. Most ppl will say that you will burn the lenardo. Or did JJrobots fix this in some way with there brainshield? Or do i need to attatch 12V to the brainshield and not to the port on the leonardo?