eBay TB6560 Stepper Motor Driver Boards

[Tom]

When I said zener diode I really meant a transient suppressor diode (transorb), such as these from Vishay. But i think clamping to 50v from a 43v supply might be tricky. A zener will clamp, but wont catch transients. you could use a 47v zener as a clamp with a 48v transorb in parallel to catch spikes, with a series low ohm resistor as a current limit between the supply rails. Farnell sell the transorbs, about 30p a go.

Thanks Irving!

That's just the right amount of info... I REALLY don't want to smoke these drivers, so I feel some internet research, followed by electrickery, coming on....
There's time because I'm not cutting in anger yet - just aligning, and debugging....

Cheers,

[Mad Professor]

Today I have been able to find some free time to do some basic current testing using my bench power supply, and USB Oscilloscope.

Using the oscilloscope across the current sence resistor I get the following results.

Bipolar Parallel
DIP Switches 1-2
ON/ON: 0.469v avg / 0.33ohm = 1.421a.
ON/OFF: 0.313v avg / 0.33ohm = 0.948a.
OFF/ON: 0.234v avg / 0.33ohm = 0.709a.
OFF/OFF: 0.078v avg / 0.33ohm = 0.236a.

[irving2008]

Today I have been able to find some free time to do some basic current testing using my bench power supply, and USB Oscilloscope.

Using the oscilloscope across the current sence resistor I get the following results.

Bipolar Parallel
DIP Switches 1-2
ON/ON: 0.469v avg / 0.33ohm = 1.421a.
ON/OFF: 0.313v avg / 0.33ohm = 0.948a.
OFF/ON: 0.234v avg / 0.33ohm = 0.709a.
OFF/OFF: 0.078v avg / 0.33ohm = 0.236a.

That looks about right... i assume by average you mean RMS, so the peak current will be around 2A. Can you post waveforms as discussed?