Hi Paul,
Thanks for the info on the commercial unit.
Re timer as I need to make a board asap I'll just do it with clock and switch initially.
Thanks, John G3UGY
--- In Homebrew_PCBs@yahoogroups.com, Paul <paul@...> wrote:
>
> Hi John
>
> I don't know about the ballast question, in my old commercial but
> un-branded box which I got from a rally it matches the tubes.
>
> Mine has 2 x 8W 29cm tubes which are fine for exposing the size of
> boards I make. The clear glass area is 15 x 25cm and the tubes are
> spaced 9cm apart. There's a flat foil reflector behind the tubes.
> Exposure time with Mega pre-sensitised board is about 3 minutes.
>
> Curious what you are going to do for a timer? Mine doesn't have one and
> fitting one is on the list of things to do in the shack.
>
> Regards
>
> Paul G4DCV