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From: Roger Johansson
Subject: Re: Multilayer PCB:s, HOW?
Date: Thu, 19 Sep 2002 08:08:11 +0200
X-Newsreader: Forte Agent 1.8/32.553
"Bill sloman" wrote:
Thanks to all who replied. I had kind of imagined that you could buy
some 4 layer laminate and do something with it. Not until I began to
think about it in practical terms I realized that it was impossible to
do that. The inner layers need to be etched before the laminate is
The link posted by Scott Armitage shows that it is a rather
complicated industrial process.
For the amateur it is possible to etch doublesided boards and glue
them together with some isolation layer inbetween.
If the other layers are drilled away at some places it would be
possible to achieve contact with the inner layers.
The industrial process involving plating and other chemical tricks is
too complicated for the amateur, so he has to cut away more board
material to be able to solder the connection directly.
>After you'd got to this point you drill out the via holes, and use
>electroless plating to put a thin "seed" layer of platinum (?) onto the
>sides of the via holes, which are then plated up with a couple of microns of
>copper. where the drill as gone through copper on one of the inner layers,
>the copper is smeared out around the drill hole and makes reliable contact
>with the plated via.
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