Homebrew PCBs

On 22/03/2010 20:32, Philip Pemberton wrote:
> Leon Heller wrote:
>> I don't have any problems using Fotoboard 2 with my home-made UV
>> exposure unit (two tubes about 15 cm from the glass.
>
> So a fairly low powered unit then?
>
> The AZ210 I'm using has four 15W Sylvania F15W/350BLB-T8 tubes on each
> side, spaced about 2" apart, with a rather odd metal reflector that
> looks like it's been hit repeatedly with a very small hammer. Distance
> from board to bulb is maybe 1.5" or so, through a sheet of what appears
> to be glass (though is probably quartz-glass or something similar that
> doesn't block UV).

Won't you get a lack of collimation with such a short distance?

Leon
-- 
Leon Heller
G1HSM