Quote Originally Posted by JAZZCNC View Post
For speed control, you will need a breakout board or controller that provides either PWM or analog spindle control.

If you can get better pictures of the boards then it should be possible to identify.
Agreed with pics... I'm pretty sure I've seen a photo of that board (or similar) recently - a USB controller board with a bunch of discrete optos on it. Half convinced it has the analogue output on it - but pics, pics, pics.