Re: gEDA-user: gEDA, where are the loadable examples?

[John Luciani <jluciani@xxxxxxxxx>]

Stuart,
  
   In my attempts to improve luciani.org I broke the link that you
cited. The new link is
   is http://www.luciani.org/geda/pcb/pcb-footprint-list.html  
   I will try not to break it again.

   On the new (and hopefully improved) website I have included GIF
pictures for all of the
    footprints. You can browse the footprints by group or individually. 

(* jcl *)


On Sun, 13 Mar 2005 15:54:05 -0500 (EST), Stuart Brorson <sdb@xxxxxxxxxx> wrote:
> Hi Guys --
> 
> Welcome to gEDA!
> 
> > >> Also, in grepping for the chip building blocks I'd need, none of
> > >> the 3 main chips '82c55', 'L298' or 'L297' I need seem to be
> > >> present.
> > >
> > >That's simply because none of the existing gEDA users have had a
> > > need for these symbols.  What I do in this case if find a symbol
> > > that is close to the one I need and modify it.
> >
> > Possible, but the 8255 family is almost a cpu in it own right, so I
> > doubt there is anything useable other than its 40 pin 600 mill dip
> > packageing.  And 24 of those 40 pins can input, or output, depending
> > on how its mode register is programmed.  One would have to write 16
> > variations of it and use the one corresponding to the mode byte.
> > That, as they say, makes the cheese a bit more binding.
> 
> First, I think you need to distinguish between the device's symbol
> and its footprint.  The symbol is the graphic object you place on the
> schematic using gschem.  The footprint is the graphic object you place
> on the PC board using PCB.
> 
> There are plenty of parts with no symbols in gEDA.  This is because
> everybody just makes their own symbol for their specific job, and
> nobody shares the symbols after that.  It's just human nature --
> sharing software is fun, sharing symbols isn't. . . .  go figure.
> Anyway, you will probably need to make your own symbol.
> 
> As for the footprint, you will need to run PCB to see if it exists.
> If it's a standard symbol, it may exist.  If it's not, then you'll
> need to make it.  There is a link to a doc talking about building PCB
> symbols on this webpage:
> 
> http://www.brorson.com/gEDA/
> 
> Also, John Luciani has build a large number of PCB footprints; he put
> them on the web for free download here:
> 
> http://www.luciani.org/geda/pcb-footprint-list.html
> 
> > How is ngspice at simulating analogue circuitry thats supposed to be
> > running in pwm mode?
> 
> Probably slow -- it doesn't have the concept of event-driven
> simulation, which is very useful for simulating pwm-mode circuits.
> Try GnuCap instead.  Or download LTSpice from the Linear Tech website.
> It is Windows native (yuck!), but you can also run it under wine.
> 
> Stuart
> 
>