Homebrew PCBs

Great info DJ, thanks! 

Mike


--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
> 
> William Alford <walford@...> writes:
> > http://www.instructables.com/id/Sponge-Ferric-Chloride-Method-Etch-Circuit-Bo/
> 
> Yup, this is the standard Pulsar method (as noted in the
> instructable), and the whole reason behind the Green TRF.  With
> preheated FeCl, a sponge, and 1/2oz copper, I can etch a board in
> about 45 seconds.  You can also focus on underetched parts so you
> don't have to overetch elsewhere to get good results.
> 
> My way was to half fill a 1 gal bucket with hot tap water, slightly
> loosen the cap on the FeCl bottle (to allow for air expansion), and
> put the bottle in the bucket.  By the time I'm done putting the resist
> on, the FeCl is hot, and I pour it into my usual etch tray.  I then
> hold the board over the tray and dip the sponge into the etchant, wipe
> a few times, dip, wipe (not scrub!), etc.  The dipping replaces the
> used etchant with fresh etchant, and keeps the sponge warm.
>