Novamill - Mach3

[JohnHaine]

Having just installed one of those BoBs to replace the old one on my lathe, I can say with confidence that the 12v and 5v grounds are commoned! Therefore the 0-10v output is not ground isolated. Some years back I published on here a simple circuit to take the PWM output, isolate it with an opto-isolator, and smooth it to generate the 0-10V needed by Sprint type drives. A bit of searching should bring up the post.

[Deck36]

I did actually see that post and concluded that it was way beyond my paygrade currently.

Whatever the actual ins and outs of wiring/connections could or should be, the thing was working fine somehow.
I just need to get back to that somehow, then plan to update or upgrade the internals.