[sdiy] Grounding & computers

[Jim Patchell]

    Yikes!

    One posiblility is there is a line filter that the mains goes through.
Each side has a cap that goes to the chassis....this makes a voltage divider,
and will give you 110v on the chassis...you really need that earth ground to
prevent this.

    Anyway, this is my guess.

    -Jim

Synthusiast wrote:

> Hi list,
>
> Talking about all this grounding stuff, I wondered if you could answer this
> grounding question I've been wondering about for a long time.
>
> My computer isn't grounded. I don't even have a ground socket here in the
> room. The mains voltage here in Europe is about 220 V. Now why is it that
> the voltage level of my computer casing has to be at 110V from earth level?
> If I touch the computer casing with one hand and the grounded cable tv plug
> with my other, I can do some nice instant Michael Jackson dancing stuff
> without any practicing... Now why did they do this?
>
> Cheers,
> Martijn