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Subject: Re: [geda-user] Silkscreened component values, mailing list, and gEDA development
From: John Doty <jpd AT noqsi DOT com>
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Date: Mon, 30 Jun 2014 08:50:45 -0600
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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 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.

For SPICE, the anode comes first, so it should have pinseq=1. diode-1.sym and diode-2.sym are correct, but diode-3.sym and schottky-1.sym are wrong. Many symbol creators don’t seem to understand pinseq.

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com