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  • tommylight
  • tommylight's Avatar
04 Mar 2025 19:34

Should I just suck it up and buy a good stepper driver?

Category: Driver Boards


I bought some DM860H and DM556 drivers off Ebay and Aliexpress, respectively; they worked, but have no flyback diodes.

As PCW mentioned above, they do have flyback diodes for sure, but over voltage will destroy them as soon as powered on, and so will wrong polarity, or worst case, powering them with AC power directly from the transformer, that can happen with a miss wired bridge rectifier.
Was it you that had a blown capacitor in another topic?
  • ihavenofish
  • ihavenofish
04 Mar 2025 19:26
Replied by ihavenofish on topic New ethercat / probe basic control for minimonster

New ethercat / probe basic control for minimonster

Category: CNC Machines

So, any help on ethercat finding my drives would be nice. When i try twincat, it sees the drive but then it triggers a communication error. so something is set wrong somewhere.
  • tommylight
  • tommylight's Avatar
04 Mar 2025 19:23

Laser Head Height Sensor – Looking for a Beta Tester

Category: Plasma & Laser

That did not take long! ?
This makes it usable with Mesa boards and even parallel ports as they can easily count encoder signals
  • PCW
  • PCW's Avatar
04 Mar 2025 19:23

Custom "MESA 7c81 Clone" PCB featuring a Raspberry Pi Compute Module 5

Category: Driver Boards

Normally on a 4 layer card you do not need top or bottom fills
unless for heat sinking or shielding. You do need to be a bit careful 
about the 3.3V/1.2V plane cut/bypass capacitors/supply inductance,
and some under FPGA filling of the VCC plane can help here.

The SPI clock will be the fussiest signal so if you are routing it
a long distance, it may need parallel termination at the end of the trace
(series termination does not work with two endpoints)
  • jyeomans
  • jyeomans
04 Mar 2025 19:16
Replied by jyeomans on topic qtdragon additonal buttons

qtdragon additonal buttons

Category: Qtvcp

thanks i will give this a try tonight.
i did not know ther was a "qtvcp copy" tool
i duplacated the directory and replaced the ui fie and renamed one ot two others.
that obiously did not work.
thanks for your help.
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