Centroid Community CNC Support Forum

I printed these Din rail mounts. Thank you, they work great !! I was looking to modify one to make a DIN mount for the Relay board. Is this something you have done yet ? I'm willing to make the necessary modifications if not, but having the cad file would be necessary. Lemme know. Again, thanks... ...

Well I'm back on this and trying to figure out from the drawings which circuit releases the brake on the Z axis servo and struggling to figure it out if anyone can help? cheers Midy, Have you picked the servo drive system? I have the DMM DYN4 system and my Z axis brake is controlled by the DYN4 dri...

Making sure I’m following.. this differential driver is needed(?) for noise issues in the step/direction signals between Acorn and DYN4 drive? Slodat, The differential driver is not explicitly required. There has been some chatter on the forums of how electrical noise in control panels is affecting...

I spent a lot of time last night reading about TTL and push/pull drivers. This circuit board experience has taught me a lot. Anyway...

I took a closeup pic of the DB25 connector and the IC's in the area. To me it looks like the push/pull driver is a ACT125G.

eng199, You are correct, I actually use the AM26C31 part, and actually pull the signals directly from the DB25, since they are TTL and have build in pull up resistors. Russ I'm not sure if you're talking about the ACORN output or AM26C31 input. There are only pull up resistors on older ACORN revisi...

Here is my PCB, designed and ordered. I used EasyEDA and JLCPCB. It was $14US (shipped) for 10 boards. I didn't check the forums until this morning, so I missed the suggestion for OSH Park, next time:) I decided to add headers with shorting blocks to enable selection of +5V or GND on pins 4 and 12. ...

cncman172, Thanks for posting that! I think I will tweak my board a little to suit my setup. I have done some simple circuit boards on my first CNC router, but i had to get rid of it to make room for my new 5x10 Thermwood that I'm retrofitting. I'll have to order this circuit board, thankfully you c...

cncman172, That's great! A couple more questions, if I may. Thanks so much for your help. Do you have a schematic of how you laid out your circuit board? I'm not 100% familiar with the semi-conductor world, and in the case of the AM26C31 I am not quite sure what I should do with pins 4 and 12. In th...

Gary, The Acorn DB25 connector does NOT provide differential output signals. Those are single ended output signals. He wants to build a product that takes the singled ended signals Step and Direction and makes them Step, Step/, Dir, Dir/ which is want many commercial drivers accept. IMG_2379.JPG He...

If I use the DB25 port, which sounds like best idea for the line drivers, can I still use the screw header connections for my drive enable signals? I could use one of the 4 outputs on the DB25 and enable all the drives at the same time if the enable screw connections aren't enabled while using the D...