On Wed, 2012-01-25 at 23:07 +0200, Viesturs Lācis wrote:
... snip
> Kirk, I am getting totally confused...
Sorry about that.
> What is the difference in schematics between both images in Your last
> email? I cannot see any...
NPN Not Pointing iN
|/ Collector
Base ---|
|\
V Emitter
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PNP Pointing iN
|/
---|
|<
\
The difference is in the Base voltage that turns the transistor ON. With
NPN the base needs to be a higher voltage than the Emitter. Usually the
emitter is at ground so a positive voltage around .6 volts will do it.
For PNP the Base voltage needs to be lower than the Emitter, so the
Emitter often has the positive supply going to it. Then the base can be
switched to ground to turn the transistor ON.
> And I have a question about Screenshot 6 and pin numbering of BD139.
> Does it differ from this one?
> http://picpaste.com/bd139-OI8vROGu.png
>
> Viesturs
I used this as a reference:
http://www.fairchildsemi.com/ds/BD/BD139.pdf
but after looking at this:
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00001225.pdf
it looks like the SOT-32 and the TO-126 package have a different pin
order. Go figure. There seems to be a TO-225AA package too.
--
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA
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