Well I tried it.
Worked great for me. I made a video and will post it tomorrow afternoon.
me
--- In Homebrew_PCBs@yahoogroups.com, "fredbutz" <fredbutz@...> wrote:
>
> I'm about to try the Sulfamic acid one. I also got the chemicals on EBay. I'll let you know.
>
>
> --- In Homebrew_PCBs@yahoogroups.com, Larry Battraw <lbattraw@> wrote:
> >
> > > > > I have very good luck with elctroless tin. The formula I use came from the September 1971 issue of Ham Radio magazine.
> > > > >
> > > > > .5g Stannous Chloride
> > > > > 2.0g Thiourea
> > > > > 3.0g Sulfamic Acid
> > > > > 100.0 mL Distilled water
> > > > >
> > > > > The solution is ued cold, I never tired heating it. It plates up in a few minutes and does a goog job but can't be use as a resist for further etching. The solution does not keep and I always make up a fresh batch for each board making session. I would usually mix up less than 100 mL depending on the size and number of boards I was doing.
> > > > >
> > > > > Craig
> >
> > Has anyone else tried this? I ordered the chemicals off eBay and
> > tried it with sulfamic and sulfuric acid (separate times) and it does
> > not seem to work. I was very careful measuring, used distilled water,
> > and cleaned the copper with sandpaper so it was completely exposed.
> > The recipe using sulfuric came from here:
> > http://www.finishing.com/0200-0399/260.shtml
> >
> > The only thing I can think of is that the Stannous Chloride I have is
> > not actually what it seems to be since it's the only thing I haven't
> > been able to substitute something else for. I tried a recipe for
> > electroplating which uses Stannous Chloride and Hydrochloric Acid and
> > also had no luck-- it turned the copper I was trying to plate black.
> > Perhaps I have Stannic Chloride? I have no idea how they differ.
> >
> > Thanks-
> > Larry Battraw
> >
>