The “voltage regulator” that he discusses on his pre-purchase form is just something I tacked onto the board in case somebody wanted a three terminal regulator for some other purpose. It is not needed for this development at all. However the traces are
there if you decide you would just love to have some 9 V or 12 V or whatever for some purpose. I guess I had extra printed circuit board real estate and was looking for something to do with it!