Hi! I have a parallax board of education with r servos and 4 buttons connected. I have a set-up so that every time I press a button, it turns a servo. I have the board hidden, and a DC adapter plugs it into the wall. Can I leave the board on and plugged in at all times, so that I can press a button whenever needed? Or would that harm the board? Electricity cost is not a factor. Thanks in advance!