[sdiy] PCBs

[John L Marshall]

Etch boards in microseconds - nitric acid + sulpheric acid + glycerine


----- Original Message -----
From: Jim Patchell <patchell at silcom.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, January 03, 2002 7:04 AM
Subject: Re: [sdiy] PCBs


>      I think that is Nitric Acid....YikeS!
>
>    If it was Nitric Acid (HNO3), this would produce an orange gas (NO2),
> which is very toxic.  If you want real fast etching, you add hydrocloric
> Acid to the mix (HCl), which would probably reduce the etching time to
> mere seconds....
>
>    However kids, please don't try this at home.  Nitric Acid is nasty
> enough, mixing Hydrocloric Acid in with it can be downright dangerous
> (the stuff will even disolve gold in this combination).  It also make
> very nasty burns on your skin.
>
>    -Jim (reformed basement chemist)
>
> Sowa Roman wrote:
>
> > I agree totally with Jim.
> > I don't do PCBs at home for a long time since I found out how nice and
cheap
> > they can be made at the fab. Myself I only make boards that can be made
with
> > Dremel cutting wheel.
> > Just for the look of well made soldermasked PCB it is worth it to pay a
> > little
> > extra and not have fingers burnt with chemicals.
> >
> > But,
> > when I was making them home, I used also nitrogen acid (not sure if it's
> > proper
> > english name of it). Good resuld in short time, but little dangerous
because
> > of
> > produced gass (hydrogen?).
> >
> > Roman
> >
> > ""-----Original Message-----
> > ""From: patchell [mailto:patchell at silcom.com]
> > ""Sent: Thursday, January 03, 2002 5:29 AM
> > ""To: sysyphus at sympatico.ca
> > ""Cc: synth-diy at dropmix.xs4all.nl
> > ""Subject: Re: [sdiy] PCBs
> > ""
> > ""
> > ""    I learned to design printed circuits at my first job.  I
> > ""would check the
> > ""layouts done by the layout guy (this was back in the bad old
> > ""days when this
> > ""was done with tape on mylar).  Eventually, I started fixing
> > ""the problems
> > ""myself, and then when the layout guy went to another job, I
> > ""took over those
> > ""chores.  Doing layouts is more of an art.  If you want to see
> > ""some good
> > ""examples of PCB layouts, you can go to my web site.
> > ""
> >
> >
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