Mail Archives: geda-user/2012/04/24/15:35:24
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On Tue, 24 Apr 2012 20:30:46 +0200
Peter Stuge <peter AT stuge DOT se> wrote:
> Colin D Bennett wrote:
> > The pcb footprint called 'SOT23D', on the other hand,
> > This is a misleading and flat-out wrong footprint
>
> What's the way to send patches that fix the issues you point to?
Well, I don't think there is only one solution for everyone, but
if you want to use method (1), where the schematic symbol for
the diode (or BJT, MOSFET, etc.) is specific to the part, you need
a special symbol for each part, like:
- http://www.gedasymbols.org/user/stefan_tauner/symbols/diodes/schottky-dual-anode-1.sym
- http://www.gedasymbols.org/user/stefan_salewski/symbols/Diode-SOT23-1.sym
- http://www.gedasymbols.org/user/filip_dominec/symbols/NPN_SOT23_BEC.sym
For the second method (which I generally prefer), you use more
abstract schematic symbols like
- Diode.sym (attached),
- LED.sym (attached),
- gschem built-in npn-1.sym, npn-2.sym, npn-3.sym (pins
numbered as "B", "C", "E") or nmos-1.sym pins numbered G, S, D.
along with footprints that have pins/pads mapping these logical
pins to physical pins/pads like
- SOT23__MOSFET_1G_2S_3D.fp (attached)
- LED1608M.fp (attached)
Of course it's not perfect, since it is wasteful to have to
maintain multiple versions of SOT23 footprint for MOSFET, diodes,
BJT, etc., but I think it's often to cleanest way to do it right
now.
The ideal way is to have a "parts database" mapping layer between
symbol and footprint.
See http://www.delorie.com/pcb/pin-mapping.html
and http://www.delorie.com/pcb/component-dbs.html
BTW, it's kind of odd and pretty inconsistent that the gschem
built-in library has "logical" pin numbering for the BJT/MOSFET
transistor symbols, but "physical" pin numbering for the diode
symbols (or at least uses ambiguous and non-self-documenting names
"1" and "2" for terminals). But we've talked about the fact that
the symbol/footprint libraries could use a lot of love anyway. As
you say, someone needs to stop talking and start doing! Kai-Martin
decided to design his (heavyweight symbols) library on gedasymbols
and has some nice stuff and good ideas, even if I tend to prefer the
lightweight symbols most of the time.
Regards,
Colin
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