Homebrew PCBs

Hi Leon,
The biggest problem I had with Fotoboard was that the resist seemed to vary
a lot in thickness. I had one panel that was particularly bad. It had a
stripe down the middle that was nearly nonexistent. Paerhaps I got a bad
batch.

Les


>
>
>
> >From: "Les Newell" <les@...>
> >Reply-To: Homebrew_PCBs@yahoogroups.com
> >To: <Homebrew_PCBs@yahoogroups.com>
> >Subject: [Homebrew_PCBs] My recipe for success
> >Date: Thu, 24 Jul 2003 16:08:06 +0100
> >
> >Hi,
> >
> >I have been experimenting with inkjet printing and have come up with a
> >system that works for me. I recently printed 20 boards with 12 thou
> >track/gap and had no track breaks or shorts.
> >I have a Lexmark Z25 printer and a home-made light box using 4 x 12W
tubes.
> >
> >Print on to JetStar film with the printer set to maximum quality, photo
> >paper, using original ink. This puts on so much ink you can actually feel
> >the tracks if you run your finger over them.
> >Use Mega Electronics Microtrak board and expose for 5.5 minutes (this
will
> >vary, depending on your light box).
> >Develop in a tray, tipping the tray backwards and forwards until there
are
> >no more streaks of resist coming off the board. Rinse the board then dip
it
> >in the etch tank tank, remove it immediately and rinse again. The areas
to
> >be etched will now be stained by the etchant so it is easy to see if the
> >board has exposed correctly and all unwanted resist has been removed.
> >
> >If all is well then etch the board.
> >
> >The make of board is important. Microtrak seems to be very tolerant of
poor
> >contrast artwork or incorrect exposure times. If you are having problems
> >getting a good result it may be worth trying a different make of board.
The
> >quality of the resist seems to vary quite a bit between different makes.
> >
> >The film came from Rapid electronics http://www.rapidelectronics.co.uk
> >Order
> >number 3041500 for a pack of 10
> >The board comes from Mega Electronics http://www.megauk.com I had trouble
> >using their Fotoboard2 but the Microtrak seems to work well.
>
>
> I use Fotoboard and don't have any problems.
>
>
> Leon
> --
> Leon Heller, G1HSM Tel: +44 1424 423947
> Email:leon_heller@...
> My web page: http://www.geocities.com/leon_heller
>
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