This video is very clear! But why is the current source connected to ground at 23:08?

Thanks 🙏👍💯😊

Very clear, concise, and easily applicable to other amplifier circuits....much easier to understand and apply than the electrical circuits courses I took in school....

best video that explains every step

Best video out there

Very elegant explanation. Great video.

Mark if you are seeing this comment. i beg you to continue your videos. this videos are AWESOME!!!!!! Thanks a lot

Dear Mr Mark, I hope you are doing well. Thanks a lot for these excellent videos which are brief but contain so much knowledge and deep understanding for the subjects. Are you still continuing or plan to continue these lectures? Best wishes.

Outstanding teaching; clear, concise and neat. The best explanation on KZfaq.

I don't have word this is great

The best, and so far the only understandable video on this subject I have seen -- and I have seen many.

We short circuit Vin for measuring Rout as there is a voltage source of Av*Vi in internal composition of the right part of the two port :)

Thank you very much sir for your generosity in sharing this very needed knowledge and delivering it in the most effective way. From now on wards I'm a subscriber. Thank you again. God bless you sir.

Mr. Mark : Why are the input signals shown with a +/- in the a/c analysis circuit? I have seen them in some text books also. Regards.

I love you MARK!!!!!!!!!!!!!!!!!

i came for copper , but found netherite

What's "Small-Signal"?

If someone can help me understand the first AC equivalent circuit I would greatly appreciate it. I'm a little confused as to how RC and RE can be said to be in parallel. To me, it would appear that from an AC perspective, shorting the power supply appears to shunt everything out of circuit except for R1 as the entire side of the circuit up to what was the collector side of R1 would have to be at the same voltage potential. To my limited understanding, this AC circuit would simply look like R1 is one branch, and the other branch is a parallel connection between R2 and RE if the transistor is on. It just looks like the series combo of RC and RL would have the same potential at both ends so there could be no current flow through them

What I dont understand is why does the current i_c flow through R_C and not directly to ground at 11:55 ?

Nice explanation sir ❤

may i ask on the last circuit why do you ignore the fact that r pi is in series with rf?

First time I comment a youtube video, but this one really deserves it, great explanation and concise, keep it up!

Thanks alot please keep making more content you're very good.

i love you

Can I get your email address

European people are smarter in tech as usual

This is by far the best video I've watched on youtube about any topic on EEE. So so good and nicely explained.

Hello Mark, Your videos are very usefull. We miss you and your lectures. Would it be possible to get more please? Regards

Great presentation - Thanks a lot - This is very valuable for a beginner.

Excellent ideas you've just given

I'm so glad I've found this video, you don't know how this helped me. Not only I learnt how to re-draw the circuit into equivalent one, but I also revised the circuit solving. Thank you.

This analysis is fine as long as the output voltage swing is very small compared to Vcc , ie around one tenth of it . But once you try to have a bigger swing in the output, the gain will vary tremendously, and the output signal will get deeply distorted. These lectures may be good as a starter, but not in the real world. If someone wants to know what is in the real world, see this lecture and enjoy 🙂. kzfaq.info/get/bejne/h594l7ylmLyre4k.html

Amazing explanation. Thank you

Thank you so much!!!!!! Life saver

I am literally paying $27k per semester (less than 4 months) to learn this. And my class isn't as clear as this.

Finally I really get it, thank you. We put together a circuit like this in class yesterday and we really didn't quite understand what we were doing, despite many weeks of prestudies. So many teachers are just all over the place and wants to teach everything at once, making it incomprehensable.

It was a very clear and nice explanation. I have seen a lot of videos but it was really good considering you have showed the logic behind the analysis instead of random formulas. Thank you so much, sir.

Brilliant Video! Thanks.

watching from the USA! 🇺🇸

Thank you!!

35:35 If the circuit has L parellel R --> Rout=RL? Right?

nice explanation!

In Israel ,your freedom of speech is restricted. My device has been compromised and my comments are being segregated/erased/edited.

Great video, thanks a lot!!

Best lecture ever ! Thank u

Thats very complicated

Oh my god your videos was saving me until i realized your last video was for bloody 3 years ago. Please continue with more transistor examples.🇮🇷 im from Iran BTW

I'm looking forward to similar videos for MOS transistors.Thanks.

Thank you to make me understand in a half-hour while uni. prof couldn't in weeks.

Many thanks for these lucid presentations. Where can I buy your book!? One thing still hurting my head: you say at the start 'the dc power supply looks like an infinite capacitor', so you short-circuit it. But the a.c. input signal is never travelling north towards Vcc, so never going to ground via the power supply cap, so...??