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Still no real optical isolation. Common ground. Dangerous.

Hi,

I have Gecko G540 Rev.5. Now I'm rebuilding my machine and I'd like to put resistors on motor side of the cable. However, Rev.5 is not noise-tolerant, and I'd like to mod it. As far as I can...

Agree. That is, the board should have separate power inputs. Sometimes it does.

I saw a couple of good single-channel Chinese TB6560 board somewhere on eBay. They have been photographed so that the entire board layout was seen ant it was exactly the recommended datasheet...

In older USSR made devices there was a quite common solution to that.

A time delay circuit was a Schmitt trigger (usually built from these big metal 1960's discrete transistors) with a capacitor...

Another common problem is wrong configuration. These boards come in at least two versions having different pin assignment. Try both.

Hi,

Another approach to it is to use just one charge-discharge relay. To limit charge current, install a thermistor (one of NTC type). It has relatively high resistance when turned on. As current...

Do you mean that 3-channel blue colored board with a small fan on a heatsink? If yes, I have to disappoint you: this board has errors in its design.

First, check the value of current sensing...

Motors are easy, they are pretty standard. You have to choose the right motor size then find the most powerful motor of that size you can buy. CNC conversion is easy as long as you have a working...

The smallest (and probably cheapest) thing you can get is Chinese "Xendoll" W-series. There is even CNC model available. But it is more like a toy.

It is good for occasional hobby work like...

Yes. Of course.

Absolutely.

Please note, four diodes going to ground are probably already on the board (in the long row of diodes next to the row of connectors). You probably do not need to install them. But...

For motors: Each winding needs four diodes, two at each output (8 diodes for one motor total). At each pin, one diode to ground (cathode to motor, anode to ground) and one to +12-36V (anode to motor,...

Just ordered a 5-axis version of this board (probably the new one) plus a digital display.

I haven't modifiet it yet (it works but not very good, now I use it to mill acrylic case for it, later...