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Date:	Mon, 30 Jun 2014 14:38:50 -0800
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Subject:	Re: [geda-user] Silkscreened component values, mailing list, and gEDA development
From:	Britton Kerin <britton DOT kerin AT gmail DOT com>
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On Mon, Jun 30, 2014 at 6:50 AM, John Doty <jpd AT noqsi DOT com> wrote:
>
> On Jun 30, 2014, at 6:02 AM, Peter Clifton <pcjc2 AT cam DOT ac DOT uk> wrote:
>
>> I think diode-3.sym agrees with the ACY series diodes in PCB (or at
>> least, has reversed pin 1 & 2 from diode-1.sym.
>
> Screaming Circuits recently stopped checking diode pin numbers against schematics, resulting in a bunch of boards with reversed diodes. They told my customer that "the convention" is that cathode is pin 1. Perhaps there is an emerging defacto convention, although I’m not aware of any standard.
>

> Most of the symbols in the library predate the shotgun marriage between the

Not shotgun marriage.  Normal healthy consensual sex.

> gEDA and pcb projects, so of course there are inconsistencies. The library
> symbols were created at different times by different people for different
> design flows. Their creators generally did not understand flows they were
> not using. Nobody knows how to make a symbol that supports every flow.

This is always the excuse for the bad state of the symbol libraries.  But 98%
of the time there is no reason to change the footprint/mask/stencil etc.
for a given part, and the most common flow by far is gschem->pcb.  Nor is
there any reason having that flow work gracefully should prevent other custom
stuff from working.

Of course we can't produce a full coverage symbol library.  As you point
out previously that approach is fundamentally flawed anyway: its pretty much
guaranteed to result in a bunch of untested buggy heavy symbols.

What we could in theory achieve is a set of tested prototypes from which people
could pick and choose, and some systematic way to tweak existing symbols to
quickly produce what is needed.  The trouble is everyone who cares already
has their own library and system for producing new symbols from prototypes.
Kai's way doesn't sound good for me and I'm pretty sure he would hate mine,
but there's probably no real reason for this other than their independent
invention.  Sad.

Britton

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