[sdiy] PCBs

[Jim Patchell]

   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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>>> 
>>>