Homebrew PCBs

Bob, so can you get down to 10 mil traces and spacing? I have thought about
silk-screening resist in the past, but have never had the guts to try it :)

A while back I ran into a craft type website that had a screen product that
one could run through a laserprinter directly instead of using a photimage
method to get the image onto the screen, but can't find the link in my
favorites right now.
I'll keep on looking.

Lukas Louw





>
> I have had great success with this process and making printed circuit
> "silkscreens" (also very easy) but instead of transparency paper (too
> expensive) I used a very light weight "onion skin" type writing paper
(about
> $2.00 for 50 sheets) that took the ink very well but still let the UV from
a
> sunlamp through. I placed this over very fine printing silk set in a frame
> that I had coated with silk screen emulsion (artshop) for about 9 minutes.
> After the screen was made I printed the image to circuit boards using a
> squeegee and black acrylic ink. Let it dry and etched it. washed the
acrylic
> ink over with a scrubbee. I made a ton of boards and those that printed
> badly, I just washed the acrylic ink off and printed again. Good for all
but
> very fine traces (like 5 mil). This method is cheaper than transfer paper
or
> anything else (IMHO)
>
> Bob



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