As a practical matter, the electrical symbol for the NPN transistor
will show the emitter arrow pointing AWAY from the junction, while
the PNP will show the arrow pointing TO the junction. This coincides
with the direction of conventional (NOT electron) current flow.
Moe
--- In motm@egroups.com, "Paul Schreiber" <synth1@a...> wrote:
> NPN = Negative-Positive-Negative
> PNP = Positive-Negative-Positive
>
> Transistors are 3 layers of silicon with added ions (called 'doping
> impurities').
>
> Paul S.
>
> ----- Original Message -----
> From: <perpetual@u...>
> To: <motm@egroups.com>
> Sent: Thursday, December 07, 2000 2:24 PM
> Subject: [motm] NPN/PNP?
>
>
> > sorry, i know this has probably been covered but an archives
search
> > didn't turn up any messages.
> >
> > what is referred to by NPN/PNP?
> >
> > thanks,
> > alex
> >
> >
> >
> >
> >