Homebrew PCBs

On Fri, 2009-06-12 at 11:53 +0000, scx31114 wrote:
> 
> Yes, the connection is to made at the two opposite wires ends.
> 

It seem to me the 'neighbouring parts' was the plastic boards so my
surprise. So is a 'heating tube/wire' bought at any length and you make
both connections yourself. Ok don't worth the bits this questions. I
think will use my hot air rework soldering station if i damage the
heater i already bought one as spare.


> For the polymer based solution, i have tested it.
> Working with fresh solution is ok, but for now, 
> i have used chemistry aging issues. Neverless, the cost is 1-2 Euro
> each operation (Eurocard size) or multiple of it, and for home use,
> it�s really attractive. 

Again i misunderstood, seems we are both non English and are lost in the
translations. What polymer based chemistry? Both i mention have water
soluble polymers. One is palladium based (palladium - polyvinyl
pyrrolidone nano particles) that bungard sells and the other (truly
German) is polythiophene polymer based, and i mention a test of just
polyvinyl pyrrolidone as activation, it as low conductivity but could
work if it bonds to the permanganate conditioned resin. Did you mix any
plating chemistry yourself? 
I have experience with the bungard package, both chemistry and machine,
regardless human error is very stable along the time (chemistry not the
machine, bungard machines are crap). 


> Vacuum distillation. The only cheap/right way to do it.

Since i have plenty of sun here I thought using the sun to eliminate my
small run washing and rinse water. Never thought in vacuum... but will
be needed a high pressure pump and it will 'drink' lots of water.

> I have speaked a lot with water waste threadment companys, that
> have experience in pcb production. I have the reactivating procedure
> for the water threadment resin that bungard sell, but all concord,
> that the vacuum distillation method is the
> best/cheapest. In addition, the resulting concentrate liquid could
> be added to the chemistry, and the water reused. 

The water treatment next to the bungard plating machine i used was
simply a deposition tank, the 3 resin ion exchange filters, the nano
size filter, and the pH controler/injector tank. But not from bungard.
But I think their machine can use resin ion exchange as pellets. Resin
ion exchange filters aren't cheap.

> As example, at 25mH, the Water boils at 25 degree.

Units!! 25 mmHg and 25 degree Celsius right? I checked at one
temp/pressure table. As i said 0.03bar seems to need a powerfull pump
and it will 'drink' lots of water. But is a fast cheap solution! I
wonder if a refrigerator motor can do vacuum?!

Very thanks for reply.

>  
> My working point is 30 degree, with 20-25 degree cooling (water) coil,
> without using external compressor or peltier modules.
> It�s really simple building such a system.

>