eBay TB6560 Stepper Motor Driver Boards

[russell]

Doh - I think I must have had a senior moment last night! I was assuming that the current sense resistors were in series with the motor but of course they are the other side of the output bridge so the current is unidirectional there thus it should be going from 0 to 0.375 V.

Still the waveforms don't look right to me. I can't check on my board as I no longer have access to an oscilloscope but according to the data sheet the motor current waveforms should look like this:

The waveform across the current sense resistors will of course be rectified.

Hope that helps.

Russell.