Spehro Pefhany wrote:

>>My development setup looks like this at the moment:
>>
>>PIC - USB hub - Laptop - ICD - back to PIC
> 
> Where is your ground loop happening?

> That's only *one* ground for sure. You can't get a loop from one
> connection. So where is the problem coming from?

Not sure whether that's exactly the problem, but one loop here are the two
USB connections between the laptop and the PIC. That's a small loop, but it
is a loop.

If this is the problem, it should go away no matter where you pull the
ground in those two connections. 

Gerhard

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