Thank You for all the interesting replies.. but changing slightly topic
and entering into PCB design, let me ask one thing:

a ground plane with a big hole in the center is a ground plane or is a grou=
nd loop?

I'm tempted to use star-like 0V connections instead of a ground plane, as I=
 cannot
guarantee it to be a "plane", due to non sporadic signal tracks immersed in=
to it.

I understand the need to keep the resistance and nonetheless the inductance=
 as low
as possible, but I have seen things like "flooded" ground tracks that go no=
where,
then thin tracks that connect large ground zones, etc.. and now I know this=
 is very
bad design. Perhaps designing with a star topology in mind will produce a b=
etter
and more *aware* result, what do you think?

As for the 'scope issues, I understood. Thank You very much for this reply =
and for
the ones in the other thread, about simulating isolated circuits on LTSpice=
 (I write
this here as a note to not inflate the post count too much with "just" than=
ks).

Greets,
Mario

--=20
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