[sdiy] PCBs

[Theo]

Well it is ontopic I guess.
It is DIY and does produce sound in a synthetic way.

Have a old school book here from the 1939,
aimed to prepare the Dutch school children for the upcoming war
between France and GreatBrittain.
Lots of interesting synthetic DIY suggestions in there.
Some include the warning that they WILL blow in your face.
Nitric acid + sulpheric acid + phenol + aluminum powder is one of them.
Guaranteed to blow you away, in tiny tiny pieces.

Theo




From: Jim Patchell <patchell at silcom.com>

>
>    Yes, put the BANG back into synth-diy
>
>    -Jim
>
> John L Marshall wrote:
>
> > 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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> >>>
>