--- In
Homebrew_PCBs@yahoogroups.com, Stefan Trethan
<stefan_trethan@g...> wrote:
> On Wed, 28 Apr 2004 08:03:11 -0400, Roy J. Tellason
> <rtellason@b...> wrote:
>
> > On Wednesday 28 April 2004 05:22 am, ballendo wrote:
> >
> >> 64x64" board size. .001" resolution. 16layers. Creates EXCELLENT
> >> gerbers/docs for the board house!
> >
> > That "layers" part caught my attention -- is multilayer stuff
really
> > practical
> > in a homebrew context?
> >
>
> these are drawing layers i think, not board layers.
<snip>
yup.
a single layer board has
Top copper layer
top paste layer
top solder mask layer
top silkscreen layer
drill map layer
drill hole layer
mechanical layer
seperate file/layer for NCDrill locations and/or Echelon drill file.
a two layer adds...
Bottom copper
bottom paste
bottom silkscreen
> Multilayer boards require the use of throughhole plating, which is
> slightly complicated
> to make (and expensive). Some here have done it, and use it with
success,
> most (including
> me) fear the costs.
I routinly make two layer boards but do not plate thru holes. I find
that by adding bottom traces and resistors or DIP chips, I can make a
smaller board without adding to the costs. Actually saving board
material saves on costs.
I made a 4 layer board by overlapping 2 2 layer boards. I needed
huge power traces and could not get them to the TSSOP chip and add
all the support caps and resistors. Simple square posts standoffs
carry the current.
Dave