Homebrew PCBs

Hans Wedemeyer wrote:
> Today I needed a board.... NOW...... so I made one.
> Wish I had through hole plating, but that would only have added some
> more time, I hand wired the via's by riveting soft copper wire into the
> 16 mil holes.
> 
> SMD C's and R's are 0805
> 
> Transparencies exposed in my workshop normal room lighting, printed
> using HP laserjet 1100, in the ground plane area I can see light through
> it, it look grey when held up to room light. Notice the ground plans are
> clean and show not problem with what many would say was not dark enough.
> 
...
> 
> OK so this only has everyday 0805 and 10 mil traces  nothing super
> small. Notice where possible I make via pads as big, I like to make it
> easy for myself.
> 
> So... the edges may not be razor sharp, but I'm fairly sure the
> electrons are not going to complain about that, I think they like the
> silver plating...( I used CoolAmp)
> 
> The point is, making everyday boards does not require rocket science,
> special printers and all that. Just get to know you Light source,
> distance and
> the Lye developer and you can made boards like this all day long.
> 
> Could I have done it with an inkjet printer, well I'm sure I could, but
> the LJ prints the artwork in 20 seconds, none of my three InkJet and do
> that !
> 
> If anyone has a problem with this kind of board lets hears some sensible
> arguments, tell me why it's not going to work, and explain the reason
> please...
> 
> As far as I'm concerned the issue that  Laser Jet's are not good, is now
> put to rest once and for all.
> I suspect the people that tried LJ's may have had poor results because
> of bad media, or toner cartridge may have been low, or both.

I'd just like to know if anyone has done fine-pitch 256 pin fpga or cpu
boards with a laser...