Homebrew PCBs

On Thu, 22 Jul 2004 07:00:13 -0300, Alexandre Souza 
<alexandre-listas@...> wrote:

>
>     I still cannot get the point of a spray etcher. Someone could direct 
> me
> to a site or something I can get more info? I'm really curious about this
> one.
>



A spray etcher is faster than most other methods, because it uses a lot
of force/agitation. It is basically a set of nozzles spraying etchant
at a board, and the nozzles move so it is distributed evenly.
You get etch times around one minute or even less with it.

If you etch in a bowl the "used" etchant will sit close to the surface of
the PCB, prolonging etch time. you will want to use some sort of agitation
(like moving the board or bubbles) to speed it up. But even with a lot of
agitation you don't get the speed of spray etching. (dunno why)


ST