Also, I'm investigating how to get rid of the last little bit of ground loop noise, and I'm thinking of trying out an isolated power supply.

Right now I'm using one of these:
https://www.pololu.com/product/2851

And I'm thinking of switching to one of these:
https://www.digikey.com/product-detail/e...81-5-ND/2242601

What do you guys think? Would that power supply at least work in my prototype?
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Tony Fabris