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

I'm also curious as to what the real use is for the bubblers. Are we
trying to aerate the solution, or cause some movement in the solution
to get more even etches?

What I wish to use is a clear acrylic, welded together with the
acrylic cement, and cause the liquid to move by using a small
propeller. Obviously I can't run an electronic motor inside the tank,
and most gears and bands would probably fall apart after the first
board is done.
So.. this is the idea I had. Keep the motor outside of the tank,
and connect two magnets to the drive shaft. For the propeller, use
the same material that the tank is made of, and seal matching magnets
or iron slugs into it, so that I can spin it using the magnetic force.
Oh yeh, I also cant run it at 50k rpms, so I will make a simple
gearbox to lower the speed and boost the torque.

If the bubbles are still needed, I just want to run one single
line of bubbles, right near the prop so as to get things aerated.
I haven't quite decided whether or not I want to submerge a heater
in the tank, or build in a heat pump.

Any ideas on this?
-tommy