gEDA-dev: Diode symbols in GSchem and PCB

[Peter TB Brett]

On Tuesday 12 December 2006 09:50, Tomaz Solc wrote:
> Hi
>
> I just noticed (a few minutes before making a mistake in the actual
> circuit) that PCB and GSchem have different ideas about which pin is 1
> and which is 2 for diode symbols.
>
> In GSchem (symbol "diode-1.sym") pin 1 is anode.
>
> In PCB ("400, diode [DIODE_LAY 400]" in pcblib/generic, and also "ALF
> Axial diode" in pcblib/geda) pin 1 is marked as cathode on the silk layer.
>
> GSchem also has a symbol "diode-3.sym" which seems identical to
> "diode-1.sym" except that pin numbers are reversed (and are consistent
> with PCB symbols)
>
> I think this inconsistency is quite dangerous. I would like to propose
> renaming "diode-3.sym" in GSchem to "diode-1.sym" and deleting the
> current "diode-1.sym".
>
> Or am I missing something here?

You're not.  There are a LOT of inconsistencies between the gschem symbol 
pinouts and the ~geda library pinouts, and I'm not sure which is wrong.

I was nearly caught out by the potentiometer symbol the other day -- most 
manufacturers' data sheets seem to list the tapping point as pin 2, where as 
the geda symbol has it as pin 3.

And don't get me started on SOT25... >:-(

Cheers,

Peter

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