pens & Newbie PCB ques..

[KA4HJH]

>My etching tank was a pyrex dish with a
>bubble stone in the bottom (feed by an aquarium pump). Float the pcb on top,
>copper side down. Worked fast, no undercutting (with good etchant, of
>course)!

This was going to be my next story but someone beat me to it. This is the
way to do it, folks. The faster the etch, the less undercutting. I think
it's analogous to contrast in photography.

To keep the board in the center of the baking dish I used Lego bricks.
They're impervious to FeCl and they float. I put a few around the board and
it stays right in the center over the bubbles. I've seen a small board etch
in 2-3 minutes using this method! And tired etchant? Whaddya mean
tired--it's got plentya life in it...just warm it up a little...

Terry Bowman, KA4HJH
"The Mac Doctor"

ICQ: 45652354