Homebrew PCBs

I have no trouble with 10 mil traces with TT.  You might want to just 
try it out.   12 mil pads, 8 mil seperation could do it.  I suspect 
aligning the package will be a bit tricky but bet its doable.  solder 
wick is your friend here, unless you have a reflow oven.


 --- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan 
<stefan_trethan@g...> wrote:
> Hi,
> 
> 
> I bought a few ICs at ebay, very cheap, but some have tqfp case....
> 
> the pin to pin spacing is 20mil i believe, it are 100 pins.
> 
> Do you think this is possible with TT?
> 
> It are xilinx cplds..
> 
> I have some with 160pins (xc95216) but they have a wider spacing, 
they 
> don't trouble
> me much but the 20 mil is really a bit low.....
> 
> i would really dislike to buy some photoresist boards and my 
printer 
> doesn't make transparencys
> that are good...
> 
> 
> 
> ST
> 
> 
> (p.s. i managed to get my nylon screws yesterday... had to make 
them from 
> a old plastic clothes hanger. no way to buy plastic screws with 
hexagonal 
> head..... will report soon about the horizontal
> pcb etch holder)