Homebrew PCBs

is this THE dj delorie?  Holy crap, i was an avid djgpp user back in
highschool!


--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
> 
> "Eugene Michael" <eugenemic@...> writes:
> > Thanks, Stefan, that's great to have the picture to refer to for
this; 
> > looks like I'm within the ballpark.  
> 
> For an additional picture, see http://www.delorie.com/pcb/first.html
> 
> The IC on the right is 7.87mil traces on 7.87mil spaces (0.4mm pitch)
> and the 01005 cap is over a 6 mil gap.  So, I'm getting about 2 mil of
> variability along the edges.
> 
> > BTW, is 300 DPI a good enough resolution to use?
> 
> Keep in mind that your "pixels" are 3.33 mil across, so lines below
> about 7 mil risk being rendered with only one pixel.  You'll have to
> try and see, but I'd think 10mil would be a reasonable limit for
> 300dpi printers (~3 pixels across).
> 
> Note that PCB, the software I use, has a "bloat" setting that can
> systematically shrink or expand the copper to try to compensate for
> the way your printing/etching system works.  If you're going to push
> the limits, you might want to make sure your eda software can make
> such adjustments.
> 
> I have a test board I use to "calibrate" my etching, which tries
> different pitch/bloat settings: http://www.delorie.com/pcb/bloat.png
> There's a bloat.gbr and bloat.pdf too, if you want to try it.  The
> "bloat" setting on that board is 0.01 mil units.
>