Homebrew PCBs

> i think with the proper tubes (4 at 7") you should have 30s.
 
Well I tried the Blacklite tubes that I ended up with because as I 
remember M.G. Chemicials had said that they could be used but that 
the none filtered or non blue tubes where recommended.  

I have never exposed a board for 30 seconds.  As I said it is about 
5 - 6 seconds what I found that worked and have been for years.  I 
used a mechical timer switch to set the time.  The longest I have 
exposed is maybe 10 sec. I dropped down to the 5-6 secs just 
expermenting to see how short of time that I could do.

I took a picture of one of my boards the other evening, I will see 
about posting it in the files area. It was exposed for 5-6 sec. 
developer is the M.G. Chemicals  which is Sodium Hydroxide.  I etch 
in Ferric Chloride 5 gal. homemade bubble tank.

Ben