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Home-made surface mount board; pretty interesting!Which iCoupler are you using? AD1410? And, as they are magnetic, how do they work close to a big inductor like a motor?
Why did you connect the A and B grounds on the ACUM isolator?
Do you have the option of cutting this trace?
Isn't the whole point of isolator components that you isolate the grounds? Else you might as well just use a MOSFET or something.