Alan--
You being an EE maybe I could pick your brain over something. I burnt out one of the small circuit boards on the servo amp for the spindle and I'm attempting to replicate it. Even though I know little about circuit designing I've been pretty successful at duplicating and creating simple signal distribution boards. I use Eagle and PCB-Gcode for making boards on the mill. Anyway, this is a pretty simple shunt regulator board for which I actually was able to acquire a schematic from Servo Dynamics and I've got most of it worked out and I'm ready to order components but I'm a little puzzled by a couple of things. Got time to answer a few questions about it?
Dan