Homebrew PCBs

David Griffith <dgriffi@...> writes:

> Anyhow, I'll start with constructing a UV exposure box.  The box and
> timer stuff seems straightforward enough, but what I'd really like

http://www.delorie.com/pcb/uvled/

> is to make a gizmo that sandwiches the PCB and films between two
> sheets of glass or lexan.

I put rubber gasket around the edge of the bottom shelf (wood), and
used a vacuum to suck the glass down.  Not a full vacuum, but a
venturi setup off a shop vac (just stuck a poly tube into the end,
it's enough).  A couple of inches of vacuum is enough to hold the film
tight against the copper.  I also stack up card stock under the pcb to
get it all to the right height for an even squish.

Of course, I only expose one side at a time, using a few small
pre-drilled holes for alignment.