Homebrew PCBs

Hi guys!

I've just found this video: http://es.youtube.com/watch?v=djr1KmtAYKg

To activate the holes: why don't use copper dust with some disolte
varnish?

I think there is some 'poor man' solution, cheap and low cost hi hi


--- In Homebrew_PCBs@yahoogroups.com, Simao Cardoso <simaocardoso@...>
wrote:
>
> 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
>  > > >
>