Homebrew PCBs

A friend looked at my pictures of my failed etchings and suggested I lower
my UV light and greatly extend the exposure time. I went from 7" down to
2.5" and from 1 minute to 8 minutes. HUGE improvement. My first test piece
was done etching in 9 minutes with the ferric chloride at about 75F. The
second test piece used the same set up and chemicals but the acid sat out in
the Arizona sun for about 15 minutes so must have warmed up. It etched in
5.5 minutes.

 

My next test cycle will be with all the same except I will try using
convection etching.

 

Rick



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