Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Hi Guys,

I am working on a new etching tank for Ferric Chloride. I was using
two bubble stones for aquariums, one clogged pretty quickly and the
second one didn't last all that long.

So, I figured I would take a sheet of PCB board and drill a bunch of
holes in it as a baffle. The I would run an air hose through it and I
would have lot's of tiny bubbles coming up. Nope, I got big bubbles
out of a couple of the holes. I started out with .020" diameter
holes, then tried .035, then .045" and finally .055" holes. Not
working good at all.

So, I am stumped now and am wondering what you guys are using to get
better distribution of your air bubbles.

Chris