Video: Bipolar transistor bias conditions and class of operation

[w2aew]

I put this tutorial video together by request of one of my YouTube subscribers.  This one talks about the bias conditions, or operating/quiescent point of a BJT (bipolar junction transistor) amplifier, and how the q-point influences the amplifier's class of operation (Class A, B, C, AB, etc.). I thought it would be of general interest here...



Enjoy,
Alan

[dentaku]

That was a great video.

[robrenz]

+1

[BravoV]

Love the tutorial video, thanks Alan. 

[c4757p]

You are very good at these sort of tutorials.

[Wytnucls]

Thanks Alan, great video. Makes things a lot clearer now.

[Zad]

 How odd, I was thinking about this exact subject the other morning! I was trying to remember when I had learned about amplifier classes. After much head scratching I realised it wasn't at university but way before that in my amateur radio nightschool. I then started thinking about how I might demonstrate them if I were trying to teach the subject...

Excellent stuff, your voice is very clear, even to my British English ears.

[casinada]

Excellent as usual. No matter the subject I always enjoy your videos. 

[w2aew]

Thanks guys - I'm glad you are all enjoying my videos...

[madshaman]

Seriously w2aew, your videos are top notch.  You take requests?  :-)

[SeanB]

Very nice, I think I will show this one to a few hams who are somewhat challenged at times about amplifiers.

[w2aew]

Seriously w2aew, your videos are top notch.  You take requests?  :-)

I definitely take *suggestions*.  I call them suggestions rather than requests, because many times I might not be able to get to a particular video topic in a reasonable time (or ever).  So, if you have video suggestions, please pass them along, and I'll add them to my long list...

[Wytnucls]

I replicated the experiment with a Rigol DS1052E. I thought it would be interesting to see what it looks like on that tiny screen :
(NPN transistor C2611- Class B amplification)

[w2aew]

I replicated the experiment with a Rigol DS1052E. I thought it would be interesting to see what it looks like on that tiny screen :
(NPN transistor C2611- Class B amplification)

Excellent!  This is exactly why I put these videos together - to inspire folks like you to build something, experiment, learn!  BRAVO!

[Wytnucls]

Thanks Alan, but all the credit is yours. I can imagine putting a video like this together takes a big chunk out of your spare time and requires some careful planning.
For the sake of the exercise, here is a better snapshot, actually showing some amplification: