On 08/10/2017 03:33 PM, Les Newell wrote:

Also, common mode chokes on the DC INPUT to the 7i29 might be of help.

The 7i29 doesn't have any big reservoir capacitors on board. I was always taught that H bridges need a nice low impedance supply. Adding inductance doesn't strike me as being a good idea. I could of course be wrong.

A common-mode inductor should not add much inductance to the DC circuit, only prevent it from radiating. You run both wires through the eye of the core.


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