I've been using positive photo sensitized board. If you use a PCB
layout and print transparencies in positive it is possible to get 8
mil lines every day.
BTW I'm selling a PCB and schematic capture program at eBay
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1322475745&r=0&t=0&showTutorial=0&ed=1011923141&indexURL=0&rd=1
Currently the first bids stands at 1 penny.. but that may be too much
to ask.. !
--- In Homebrew_PCBs@y..., "caveteursus" <j.walton@a...> wrote:
> I gave myself a Christmas present, the current edition of the
> ARRL's "Hints and Kinks". The author recommends Staedler Lumocolor
> 318's which he fits into one of the refillable plotter pens. (That
> is, he cuts the marker with a utility knife and fits it, tip and
all,
> into the carcass of refillable pen. (I guess that it's kind of
> messy, but that hasn't stopped any of us in the past.)
>
> HP7475 pcb construction:
> "
> FAST AND EASY PRINTED CIRCUIT BOARDS
> Like many hams, I prefer to build some of my gear. I started etching
> my own PC boards several years ago, and I have tried
> several methods. The least expensive approach is hand-drawing the
> pattern on the board with a permanent marker. This can be
> very time consuming and does not easily permit a good parts density,
> so it wastes copper.