The wierdest part is that the 2N2222's I have work in either direction, that
is, with that LED circuit I posted.  That only adds to the confusion.  So I
guess from now on, I'll just order my transistors from Digikey and go by the
datasheet of the specific model.

Is it normal for a transistor to "work" in either direction?  My assumption
is that they CAN be reversed (C & E) but are supposed to be used in a
specific direction.

Thanks for the clarification guys.  Peace

MJ Brush

----- Original Message -----
From: "rixy04" <rixy04@VVALLEY.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, June 05, 2004 3:36 PM
Subject: Re: [EE:] Simple Transistor Question


> You cannot arbitrarily swap pinouts. It will only work in one
configuration. Just because the Radio Shack packaging says one thing doesn't
make it right. Sometimes when the vendor prints the drawing they may look at
it from the top or the bottom. It will only work one way.
>
> Also be aware that the flat side may or may not be the same on different
manufacturers package. An example is the BS170 and the BS170P. The lead
configuration is SGD or DGS.
>
> You have the right idea as far as your drawing goes. Look at this page for
other suggestions:
> http://www/pic101.com/interface.htm
>
> Rick
>
> Matthew Brush wrote:
>
> > Hi all,
> >
> > Something has been bothering me for a while.  I know there was recently
a question posted about transistor pinouts, but I was still left with mixed
answers on this.
> >
> > I have attached a (crappy) drawing I quickly made in photoshop to go
with this question.
> >
> > The package of 2N2222 transistors I bought from RadioShack has pinouts
on the back which seem to go against what actually works for me, and is also
the opposite of how Eagle Layout wires the transistor (from a
schematic->make board).  Eagle wires it the way that is in the picture,
which is also how I've been wiring it all along.
> >
> > It seems these transistor will work in either direction, but as I'm soon
to be attempting an audio circuit (as opposed to the usual turning on a
relay or whatever), I want to make sure I have it right.
> >
> > Is this circuit in the attached GIF correct, labelled properly and
whatnot?  I would assume that the collector "collects" electricity and when
the base is positive, the emmitter "emits" electricity towards ground.  But
it seems like I'm getting confused going from the schematic to the actual
circuit.
> >
> > Thanks for any clarification anyone can offer as to why i see these
standard NPN transistors wired differently (ie backwards) sometimes and not
others.
> >
> > Peace
> >
> > MJ Brush
> >
> > --
>
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