I want to give a big shout out to Timothy Rothman of Laser Upgrades. https://www.laserupgrades.com/.
Tim has helped me over the last 3 or 4 weeks with my laser problems.
I used the Black & Blue 2 control board for nearly 4 years. Then I messed up and connected 2 wires backwards, which caused the control board to burn out. While I waited for a new board from Tim I tried other control boards I had. None of them would work well. They were only 8 bit. The mahine was jerky. I had scorching when engraving that overscan would not correct. It was the worst I had ever seen.
Finally the Black and Blue 3 board that I had ordered arrived.
All I can say is it is night and day. The machine is smooth and quiet. No more scorching. The best I have seen.
I want to thank Tim again for the endless hours, many nights that he helped me. And in the end, he will not accept any payment for what he did.
If you have problems and need a control board for your laser engraver, Timothy Rothman is the person to contact.