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Copper circuit board


#1

If the acid doesn’t etch properly, perhaps the problem is in the
preparation of the board. What are the exact steps you take to prepare
the board for etching?


#2

Hello,

Ive been there a long time ago.I build electronic circuits in my
younger day’s and had these kind of problems.The problem as far as I
can just it is not your acid,since I used the same acid as you do.If
you start with a new board,they always have a protecting coat which
need to be removed with sanding paper and water.some steel whool can
do the same job,they just get rusty after a while.As far as I can
recall, I used a 600 grid watersanding paper to begin with and clean
the board with it.The next step was a kind of abbrasive dish soap
called “CIF” which is a very common product here in Europe,really
nothing special.The board has to be painless clean WITHOU ANY
vingerprints.I made a path out of plexiglass in order to hold the
board without using my vingers.Out of the same plexiglass,I made a
pair of tweezers to pick up the board.Whipe it of with a clean cloth
an be sure that the board is totaly dry before you start spraying
your photo sensitive film on it or whatever your next step might be. I
performed this procedure for a very long time and never had problems
with the etching of my boards.If you treath your boards this way you
can be more then 100% sure that the problem you have has nothing to
do with the board itself. If yo still need some don’t
hessetate to ask.I’m willing to help as much as I can and I’m not the
only one!! Regards Pedro Palonso@t-online.de