A long time ago...in a fab house far away.....

I cost extra to do a single sided board vs double. 
Talking like 15+ years ago, where boards were done
with mylar tape...

Now days, most fab houses start with double clad board
and so it all gets etched off anyway, and to photo
mask both sides is pretty much in the noise.  Only
additional costs are plating the holes, again, pretty
cheap now.

Before just blindly going down the path of forcing to
single sided board, make sure it warrents the cost. 
Of course, if your etching yourself, guess thats a
different story.


--- Olin Lathrop <olin_piclist@embedinc.com> wrote:

> Bob Blick wrote:
> > I don't use Eagle, but in general the advice is to
> raise the cost of
> > top layer, and raise the cost of vias. Sometimes
> it ends up being a
> > tossup between running the autorouter over and
> over while adjusting
> > it, and routing by hand.
> 
> I've never tried doing a single sided board with
> Eagle.  I guess your method
> uses the second layer to have Eagle tell you where
> the jumpers need to be.
> However, I see a problem when using thru hole parts.
>  Eagle will assume the
> holes are plated and connect to both layers.  That
> will not be valid in
> cases when the pins under a component on the top
> side are inaccessible.
> Somehow you need Eagle to think that thru hole pads
> only connect to the
> bottom layer, but I don't know how to do that short
> of defining new packages
> in the libraries.
> 
> 
>
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