On 26/01/2010 00:35, David Griffith wrote:
>
> I'm convinced now that I should give the photographic method a try and
> even try pre-sensitized boards. I'd like to do things the Right Way
> instead of going sloppo like I have been so far. That might explain my
> previous problems. Anyhow, I'll start with constructing a UV exposure
> box. The box and timer stuff seems straightforward enough, but what I'd
> really like is to make a gizmo that sandwiches the PCB and films between
> two sheets of glass or lexan. The idea is to put the things in this
> frame, adjust for registration, clamp it closed, and that's it. Insert
> into the UV box for exposure. I saw a page a couple years ago discussing
> something like this, but I can't find it anymore. Does anyone here smell
> what I'm cooking?
>
> I keep the boards small and one-sided, would a UV EPROM eraser work?
>
Here is my UV exposure unit:
http://www.leonheller.com/www/Photos/UV%20unit.jpgIt's made from MDF and some strips of wood, screwed tofether and glued.
I had a sheet of glass cut to size. A heavy book on top of the PCB keeps
it in contact with the transperency.
Leon
--
G1HSM
http://webspace.webring.com/people/jl/leon_heller/