Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Mark Lerman wrote:

>
> I found
> <http://www.lpkfusa.com/RapidPCB/ThroughHolePlating/proconduct.htm>
> very interesting. They have a paste that is essentially squeegeed
> into the holes, vacuumed out to clear the center of the hole, then
> baked in an oven to cure. They have a kit,l but the active paste is
> available for $240 for 20 of the 2.5 gm packages. Not cheap, but not
> too bad, especially if you can reuse open packets.
>
> Mark

There is similar things from thinktink and others, they all seem
carbon/silver curable inks. They are for make the vias conductive also
without plating after.
There is also who tried the use of and silver based car motor radiator
hole repair liquid. The bottle was cheaper but he conclude, because of
the less quantity of conductive material wasn't that cheap after all.

> >So
>
>http://www.megauk.com/datasheets/5050_Data_Sheet_ABC_Panel_Plating_Instructions_(ver.11.08).pdf
> >http://www.thinktink.com/stack/volumes/volvi/copplate.htm
> >http://electrochem.cwru.edu/ed/encycl/art-e01-electroplat.htm
> >http://nr.stpi.org.tw/ejournal/proceedingA/v23n3/365-368.pdf
> >

and also
http://findarticles.com/p/articles/mi_qa3751/is_200501/ai_n9521082
http://www.ecitechnology.com/articles/Detection_of_Accelerator_Breakdown_Products_in_Copper_Plating_Baths.pdf
about adictives

> >Sodium metal is made from electrolysis of salty water. If you could make
> >an electrolysis between the two copper layers in a sodium bath of NaOH,
> >NaCO3 etc (NaCl shouldn't work) maybe it can leave the sodium inside the
> >hole. You need an high impedance power supply for this, limiting current
> >should be used. When the board short circuits it should be plated inside
> >the holes. (My guess)
> >

Sodium and water :D It could be simpler but NO CAN DO.
Sodium metal is made from electrolysis of melted NaCl.
I just wrote that to see if someone was reading it :$ ;)

> >Simao
> >
> >Juan EA7FNJ wrote:
> > >
> > > Hi guys!
> > >
> > > Well, my problem is the chemistry: I would like to find a good guide
> > > about electroplating, but I don't find anything.
> > >
> > > Do you know about a good guide?
> > >
> > > 73
> > >