RobiD

MP, Thank you for your detailed response. I will be using old equipment so I won't consider it a priority to isolate. Thanks again, this is a great project, and I am enjoying building the cnc machine and the electronics. David

Thank you. I was worried this forum wasn't monitored anymore. David :)

I hope people still read this forum, haven't had an answer to the above question yet. Anyway, here's another one regarding limit switches. Attached is an altered version of a diagram that was posted earlier, what I need to know is, with three limit switches for x,y and z are they wired in series as shown. (excuse the poor artwork)

Hi, First time posting here, but I have a quick question. I have made the pcb and I am just about to populate it. Someone suggested to me that I should use opto-isolators to protect the motherboard from power spikes. Is this necessary? Has anyone else had this happen? Has anyone redesigned the board to have opto-couplers? Thanks for your help. David