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Mail Archives: geda-help/2016/01/15/19:06:37

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Subject: Re: [geda-help] adding missing footprints
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From: "Gene Heskett (gheskett AT shentel DOT net) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
Date: Fri, 15 Jan 2016 19:06:12 -0500
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Reply-To: geda-help AT delorie DOT com

On Friday 15 January 2016 07:58:57 gedah AT igor2 DOT repo DOT hu wrote:

> On Fri, 15 Jan 2016, Gene Heskett (gheskett AT shentel DOT net) [via 
geda-help AT delorie DOT com] wrote:
> > Greetings, new subscriber;
> >
> > Using gEDA as in the debian wheezy repo's, although I was able to
> > get a newer pcb to build, so it is 1.99z.
> >
> > I have composed a little 6 part schematic in gschem, but when I do
> > the translation gsch2pcb step, 4 of the 6 parts I chose schematic
> > symbols for, have no "footprint" and are omitted from the pcb. 
> > Loaded into pcb, it obviously makes no sense to this beginner.
> >
> > Can this data be added to the library part description?
> >
> > If so how?  And if I do it, how can I submit back to gEDA?
>
> For the PCB workflow, you need to specify the "footprint" attribute in
> gschem. It is not possible to ship a generic purpose lib with
> footprints already set because most devices are available in different
> footprints (e.g. lm358 in SO8 or DIP8, 2n3904 in to92 or sot23 or even
> dual NPN in sot23 with 6 pins).
>
> HTH,
>
> Igor2

Can this be done with a text editor, or must it refer to a known pattern 
from a library entry somehow?

IOW, where does this "footprint" data come from?

As a for instance the transistor is a 2SK3264 mosfet.

The diodes are 1N5822's, and because they are bulky bodied, will likely 
be mounted standing up, and that may still require pads on >100 mill 
centers.  That same pattern will serve for mounting everything but the 
transistor, which of course has 3 legs.

FWIW, I drew up a perfectly servicable pcb pattern in pcb 2 days back, 
but when I exported it as gcode, what should have been about 100k of 
gcode, was 1500 bytes and didn't backplot anything but a small blob, so 
obviously it ignored what I drew and placed on the bottom of the pcb.

I figured on reversing the drill file and using it to make clearance for 
short prevention on the top side as I only have double-sided board.  I 
have also made double-sided boards before with eagle, but I can't get 
the latest 7.5 to even unpack.

If I could draw it in pcb, and export working gcode, that would be ideal.

Thank you,

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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