Re: Home built PCBs

[Kragen <kragen@xxxxxxxxx>]

On Fri, 21 Nov 1997, John Griessen wrote:
> I am going to try out the direct toner method of printing conductive 
> paths with a okidata LED printer in a while, so I would like to 
> hear if anyone has suggestions for that.

Cool!  Let us know if you can find a variation that works.  I imagine the
squeegee method someone posted earlier would likely work best, using the
toner as 'photoresist'.

> Is it really feasible to print plastic transistors?  Are the ratios 
> of length and width anything like in silicon?  IF so, then the 
> registration of the paper handling path in the printer might 
> allow 4X8 mm transistors with good tolerances.   What is it 
> like using semiconducting plastic juice in a ink jet cartridge? 
> Messy?  Short life of cartridge?

Take a look at the web page I posted the address of.  Those are the only
people I know of who know anything about it.

Plastic semiconductors are pretty exotic materials.  Whether or not you
could print them from a normal inkjet printer, I don't know -- maybe you
could, theoretically, but I doubt that anyone has done it yet.

(Interesting thought.  All you need, I guess, is N, P, conductive, and
insulative... should fit in the four reservoirs of a color inkjet printer
:)

> Aside from glue logic and connecting chips, I ran across the 
> ball semiconductor method web page, which many MISC readers 
> will be interested in.  
> http://www.ball.co.jp/ballsemi_e.html

Nifty.

Kragen