Homebrew PCBs

DJ Delorie wrote:
> Looks like you got the exposure just right.  Are you using some type
> of vacuum hold-down?  I found I had to do something about that because
> the weight of the glass was insufficient to hold the film tight
> against the board.

The UV box has a vacuum pump built in -- there are four UV tubes in the 
bottom, covered with a sheet of glass, then four in the top with a sheet of 
flexible transparent plastic over them. When the timer is started, the vac 
pump runs for a minute or so, then the tubes are struck and the countdown starts.

-- 
Phil.
ygroups@...
http://www.philpem.me.uk/