Re: gEDA-user: 2N3906 gschem & pcb

["George M. Gallant, Jr." <ggallant571@xxxxxxxxxxx>]

John,

Thanks. My next question was how to migrate the proto from thru hole
to SMT. Also, there dosn't appear to be a TO92 package in the version
of PCB that I have. 

BTW, what's wrong with labeling the pins EBC in both gschem & pcb?

George

On Sun, 2006-07-09 at 21:55 -0400, John Luciani wrote:
> On 7/9/06, George M. Gallant, Jr. <ggallant571@xxxxxxxxxxx> wrote:
> >
> >  I think there is a difference in pin assignments on the 2N3906
> >  parts between GSCHEM and PCB.
> >
> >                         E   B    C
> >      PCB            1    2    3
> >      GSCHEM    3    2    1
> >
> >  I am not very good at transistors and the resultant circuit
> >  has some strange behavior (not all bad). I notice that some
> >  transistors in gschem use the EBC notation while others
> >  use 123 or 321.
>
> The 2N3906 pinout is dependent on the package. I believe the TO92 is
> EBC (123) and the SOT23 is BEC (123).
>
> What I do in gschem is have symbols called BJT-NPN-EBC.sym and
> BJT-NPN-BCE.sym. You still need to verify that the footprint matches the
> schematic symbol.
>
> If you like "heavy" symbols you could create a 2N3906-TO92.sym or a
> 2N3906-SOT23.sym that has a footprint attribute and the corresponding
> pinout.
>
> (* jcl *)



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