Re: Notebook, Hum and Ground Lifts

"Laurence Payne" wrote ...
"rrstudio2@xxxxxxxxxxx" wrote:
3. How is using a DI box to "lift" the ground better than removing
the ground from the AC adapter?

Because it maintains a robust safety ground connection to the laptop.

There is no "robust safety ground connection" on the
laptop. The only reason for the green-wire ground in
the power cord is so that the manufacturer as some place to connect those filter capacitors that are supposed
to reduce the horrible hash that comes out of the power
"brick". None of them are very effective IME. I have
seen no difference between ground connected and lifted.

I have yet to see one of those "bricks" where there is
any connection between the green-wire power ground
and the leads that actually go to the computer (or other
equipment). Except maybe one of those ineffectual RF
hash filter capacitors. They are not there for "safety",
they are there to try to reduce the horrible RF hash.
.

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