Video: Bipolar transistor bias conditions and class of operation - Page 1
Forum section: electronics / beginners

author: w2aew
author_rank: Super Contributor
timestamp: September 30, 2013, 11:24:18 pm
content: 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

author: dentaku
author_rank: Frequent Contributor
timestamp: October 01, 2013, 01:27:24 am
content: That was a great video.

author: robrenz
author_rank: Super Contributor
timestamp: October 01, 2013, 01:55:22 am
content: +1

author: BravoV
author_rank: Super Contributor
timestamp: October 01, 2013, 02:53:55 am
content: Love the tutorial video, thanks Alan.

author: c4757p
author_rank: Super Contributor
timestamp: October 01, 2013, 02:57:19 am
content: You are very good at these sort of tutorials.

author: Wytnucls
author_rank: Super Contributor
timestamp: October 01, 2013, 03:15:44 am
content: Thanks Alan, great video. Makes things a lot clearer now.

author: Zad
author_rank: Super Contributor
timestamp: October 01, 2013, 03:19:07 am
content: 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.

author: casinada
author_rank: Frequent Contributor
timestamp: October 01, 2013, 03:57:17 am
content: Excellent as usual. No matter the subject I always enjoy your videos.

author: w2aew
author_rank: Super Contributor
timestamp: October 01, 2013, 02:40:54 pm
content: Thanks guys - I'm glad you are all enjoying my videos...

author: madshaman
author_rank: Frequent Contributor
timestamp: October 01, 2013, 05:40:50 pm
content: Seriously w2aew, your videos are top notch. You take requests? :-)

author: SeanB
author_rank: Super Contributor
timestamp: October 01, 2013, 06:51:21 pm
content: Very nice, I think I will show this one to a few hams who are somewhat challenged at times about amplifiers.

author: w2aew
author_rank: Super Contributor
timestamp: October 01, 2013, 10:52:02 pm
content: Quote from: madshaman on October 01, 2013, 05:40:50 pmI 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...

author: Wytnucls
author_rank: Super Contributor
timestamp: October 02, 2013, 08:30:09 pm
content: 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)

author: w2aew
author_rank: Super Contributor
timestamp: October 02, 2013, 08:35:34 pm
content: Quote from: Wytnucls on October 02, 2013, 08:30:09 pmExcellent! This isexactlywhy I put these videos together - to inspire folks like you tobuildsomething,experiment,learn! BRAVO!

author: Wytnucls
author_rank: Super Contributor
timestamp: October 02, 2013, 09:29:06 pm
content: 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: