Homebrew PCBs

JanRwl@... wrote:
> 
> In a message dated 29-Jan-02 03:00:04 Central Standard Time,
> rjshaw@... writes:
> 
> > What methods do back-yarders use to get the sharpest
> > PCB tracks? Photographic? Milling?
> >
> >
> 
> When I need best I can do without having a pro-shop do etching, I use
> contact-printing of negatives with Kepro stuff.  But I haven't done a
> home-brew "photographic" in so long I don't even know what the various
> solutions were called!
> 
> I have done nothing more complex than a 6-IC little lashup in years, and I
> get by with Radio Shack and whoevermailorderitwas "pressure sensitive"
> "rub-on" stuff.  That works really fine, if done right, actually!

I was wondering how much resolution the various
methods get. I've found the best printers are
epson stylus colour inkjets (400 and higher),
used with epson transparencies (its coated
with an absorbing layer instead of 'sandpaper').
Using a lightbox etc, i can get 6-8mil tracks
and spacing. Works with precoated negative
boards, and spray-on positive resist (PRP).