Alan,
The Gerber files include "empty" layers. The Modular design is a two
sided PCB, simply discard the empty layers.
BTW I do not mill boards it's far too mauch work, I use Pre Sensitized
stock and exposure for 120 second using a GE 500W bulb,
then developing in a solution of Red Devil Lye, etch with Ferric
Chloride, the same Ferric Chloride I have been suing for 8 years !, most
people do not understand it, and they throw it away far too soon. Heck I
even use the same Red Devil Lye mixture until it's so green I can hardly
see the PCB developing.
.... I can make a two side board (without drilling) in about 45
minutes... 5 mill traces at 8 mill spacing are normal.
BTW mill bits, I wonder why mill bits wear out so quickly, after all
it's only copper! Could it be because people run the bit dry ? May be
people are not buying real mill bits...
I have a link at my site for a source of really good quality mill bits,
size down to 0.002" ( yes! 2 mil ) But 2 mil bits are not that cheap....
hansw
Alan Marconett KM6VV wrote:
> Hi Hans,
>
> That's quite a nice project! I think I counted 8 layers in one of the
>
> GBR files! And with over 20 apertures, I'll have to get a parser for
> the header working! I think I can pick a layer or two with pads and
> traces, and manually build an aperture table for some simple tests
> with
> my code. I was able to see a lot of the "foil" layers by using some
> aperture sizes I had defined previously for another (Eagle) demo
> board.
>
> Thanks for the URL!
>
> Alan KM6VV
>
>
> hans@... wrote:
> >
> > crankorgan wrote:
> >
> > > What I find is people are unable to find anything on
> > > the internet. Maybe they use the wrong search engine.
> >
> > I posted a complete design with PCB layout files and schematics at
> my
> > web site, during
> > the past years I have received 100's or emails from people that have
>
> > successfully built the
> > Modular Design, with or without the "Smart Current Monitor".
> >
> > The design is Free... I do not charge anything for it..
> >
> > When I get time I'm going to post a new design complete with EAGLE
> > files...
> >
> > Hans W
> > http://hans-w.com
>
>
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