Re: gEDA-user: Problems with MOSFET symbols in PCB

[Dan McMahill <dan@xxxxxxxxxxxx>]

phil wrote:
> I just use symbols for transistors and for fets that have the pinout in 
> the name:
> 
> fet-pmos-3-gds.sym
> pnp-2-cbe.sym
> 
> The name of the symbol has the pins in order 1-3, so the p-ch mosfet is 
> gate = , drain = 2, source =3 ... like an insulated to-220 mosfet.
> 
> This probably doesn't use the symbols to their full potential but it 
> keeps me from getting confused as easily.

beware that different vendors sometimes put the pin number on different 
physical pins.  TO-18's and TO-39's are some example packages where I 
have seen vendor #1 number them one way and vendor #2 a different way. 
Turns out that the E/B/C to physical location mapping was identical, 
they just mapped 1/2/3 to physical location differently.  ugh!

Thats why I use heavy symbols exclusively for things like transistors. 
No need to remember "lets see, was this a cbe transistor"  and "which 
vendor numbering".  I just say "give me a MMBT3904".

-Dan


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