Andy, this is terrific!
i assume they are discussing analog vias and not digitial vias though
but what is the green ink on CD's about?, better sound also ?
ds
Andy Gulliver wrote:
... and don't forget to allow for the effect of the Coriolis force, as outlined in the
following which is from a Hi-Fi forum a few years back (around the time
people were using green ink round the edge of CDs):
Another consideration is the coriolis force which causes electrons
to spin around the edge of plated through holes as they pass
from one level of the board to another. Since the direction
of spin around the hole does not change whether the electron
is going down the hole or up the hole, the component of current
around the hole is a full wave rectified or frequency doubled
version of the total current, causing second harmonic distortion.
Also the coriolis force changes direction from the northern
to the southern hemisphere and changes magnitude with latitude,
being strongest at the poles. This is the reason the right
stereo channel sounds better in the northern hemisphere and
the left channel sounds better in the southern hemisphere.
For balanced performance all audio circuit boards should
be mounted vertically and in a north south direction. This
not only reduces coriolis effects but also minimizes
Hall Effect voltages due to the earths magnetic field.
Unfortunately I don't have an exact date, but ISTR it was early April that year
:-)
Regards,
AndyG
>
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
Sent: 03 August 2005 17:10
To: [email protected]
Subject: RE: [PEDA] Vias.
And you both forgot that like water in a pipe, electrons will
migrate to
the side of the via in which the flow is occuring, further
reducing the
effective "trace width" of the via...
aj
[cut]
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