Half complete Triac conversion needing some advice.

[Dan-27]

Hi Kit

Thanks for your input. I've been racking my brain trying to work out how to get the open-collector transistors to send 5V to the Base on the transistor required to power the Step signal on the milling machine driver. I've drawn out 2 circuits, the first it the one I have already tried and it failed, but when I connected the 2K resistor directly to the 5V source on the breakout board, rather than the X step output (Pin 2) it did cause the X axis to step once. The second circuit is my version 2, do you think this would work?

I'm open to any suggestions, all I need to do is connect the X Axis step signal input on the milling machine to ground and I need the pulses from the BOB to make and break that connection.

Thanks

Dan.