Homebrew PCBs

>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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