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Old 12th Jan 2017, 11:15 am   #7
Terry_VK5TM
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Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,324
Default Re: UV Photo-Resist Dry Film PCB Process

I use a timer on my light box, as you can bet the phone will ring or some other interruption occur.

Also used a very similar system to Davids in the ~30years of making boards semi-commercially, but changed to using UV imageable ink instead of the dry film (although I still have the equipment for applying dry film).

The ink (TER20 by Taiyo), while a little expensive maybe for home use, is negative acting and a teaspoon would cover around a square foot of pcb material. I used a rubber craft roller to apply it, but it can be screened or even sprayed on.

Commercial outfits using the ink usually curtain coat the boards (curtain coating is passing the board through a vertical stream of the ink).

Terry
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