Homebrew PCBs

On Thu, 01 Sep 2005 23:27:29 +0200, lcdpublishing  
<lcdpublishing@...> wrote:

> I picked up a fish tank pump and a container that should be good for
> my first etching tank.  When I picked up the fish tank pump, I also
> noticed they had these thing that looked like porous stone that are
> used to spread out the bubbles.  I bought one, but dropped it on the
> floor before I had a chance to see if it worked.
> So, I am wondering if there is a good way to get bubbles to spread out
> across the bottom of my container?
> The fish tank thing only cost $1.00 or so, so I really don't mind
> buying another one to try, but I figure some of you creative folks
> here might have better method.
> Chris


I use a bubbler hose. It is kind of a hose made of foam rubber with holes  
punched in one side. It makes many small bubbles. I tried different things  
before, and always encountered uneven etching. I still see some unevenness  
with this hose, but it is much better already. You might need to get the  
lead(?) wire out of it and instead glue it to a plastic stick which you  
sink.
I want to try a long bubbler stone one day.

for larger tanks think and tinker shows a way to build a bubbler...

ST