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Re: gEDA-user: 2N3906 gschem & pcb

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 *)


--
http://www.luciani.org


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