> In the absence of somebody that really knows what they are talking 
> about, I will try and help.  I recently had problems like this with a 

Any reply to a question about EMC-related issues on this *kicad* users' 
forum (including yours) is going to be highly incomplete unless that 
reply is "Go and read a respected book on EMC".   Since the full answer 
to the question would require a book, partial answers do not imply lack 
of knowledge.

Something we both failed to mention was decoupling capacitors.   Every 
component that draws AC current needs one or more suitable decoupling 
capacitors as closely coupled as possible to the device.   These are a 
critical part of reducing the size of the current loops that Dick 
mentioned.   You may already have done this, but I see no reference to 
decoupling in the thread and insufficient decoupling is a perennial 
cause of problems.

Oh, and do find yourself a good book on EMC :).

Regards,

Robert.
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