Hi Donna thanks for answering me. Nope, dont have it, but there should be no need for it as the power supplier which comes with the Edge is good for both European and USA market. I just plugged in an italian cable which goes from the supplier to the outlet.

There might me another cause: I used to wind the replaced cable on itself, in quite small circles, as I dont need it in its lenght. I unwinded and tried charging again, and there was no hum. I should try winding it again.