Homebrew PCBs

On Fri, 15 Apr 2005 16:46:42 -0400, Alan King <alan@...> wrote:

>
>    How are your bubble etches uneven?  More finer bubbles should make  
> things
> fairly even in a local sense, if it's more etched at the top than bottom  
> or vise
> versa then use more bubbles and slope the side of the tank away from or  
> toward
> the board to even things out.

It is faster at the bottom, where the bubbles hit.
Sloped sides sound interesting, any idea how much?

I had streaks from the bubbler-holes, but i'm gonna fight that with a  
porous bubbler.


>   Not sure that's even needed.  Use a rigid frame for the board, on a  
> floating
> suspension over the tank.  Stick a medium sized massager vibrator motor  
> on the
> frame and see if that doesn't work.  May need a small amount of pumped
> circulation for best effect, but a vibrating board should do fairly well  
> just by
> itself.
> Alan


Don't like moving the board much 'cause it requires a pretty firm hold on  
the board. I have a rather nice board holder
design that clamps the board without needing to wash anything or use  
gloves etc., the downside is it can't be super-strong hold.



ST