Homebrew PCBs

Although I have done analog circuit design for 50 years, I'm a relative
newbie when it comes to circuit board etching.  Furthermore, my last
chemistry class was in 1967. Here is my first step into convection etching.

 

http://rick.sparber.org/electronics/ce.pdf

 

How do I improve this process? I understand that bubbling air into the acid
will speed it up but won't that spoil the laminar flow?

 

Thanks in advance,

 

Rick



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