#114

[@edwardbass9255]

Everytime I think of an electronic topic I need to better understand, I search your channel first. You are an awesome teacher. Thanks for all you do.

[@esvna]

That was 3 months of lectures summarized in 11 mins. Excellent tutorial!

[@Ghost572]

I know a lot of the online material on the internet sort of shows this isn't understood and just adds to the confusion, or essentially leaves you to have to fill all the gaps in before you can fully understand what is going on.

[@Zapgod]

Bro they teach us this in 3 days then test on day 4

[@ChupoCro]

@@Zapgod At university? Not really I think :-) At university you learn for 3 months only what is happening at the P-N junction when transistors are not even mentioned. And when you start learning the transistors then you learn these configurations *in details* - certainly not in just a few lessons.

[@Zapgod]

@@ChupoCro in the navy, this is how they train

[@anthonycalia1317]

You are a natural teacher. You have the unique ability to transfer all of the key information in a manner easy to understand and to the point. Excellent!

[@boonedockjourneyman7979]

Ever time I try and teach this part of BJT applications, I end up showing this video. Students really get it.

[@w2aew]

That's so nice to hear - I'm very glad to know that my work is helping people!

[@jimadams2473]

Seriously, this is the BEST transistor explanation on the web. EXCELLENT work!! Thanks.

[@caribbeansimmer7894]

It's the best I've seen as well. It's crazy how many persons make it more difficult than what it is.

[@OctavMandru]

Alan, 9y later I keep rewatching your videos. The best, most concise explanation. You are possibly on the best teachers I ever had. Thank you, Sir

[@opalprestonshirley1700]

Excellent presentation. I learned all of this over 30 years ago it is good to see someone teaching this as a needed refresher for this old man.

[@igroundspq-niverse8493]

I realize this was done several years ago, but is by far the MOST LUCID explanation on the three common configurations. Thank you so much!

[@BenWard29]

Even 11 years later, this video is still a great resource. There's one issue I'm having, though: Everytime your phone dinged in the video I looked for my phone thinking I had a notification. The ding sound of your phone sounds nothing like mine- so I have no idea why I even think it's my cell phone. I guess I'm Pavlov's dog.

[@marekmosat7176]

I just do not have a words to express how I love your videos. Thank you Sir.

[@justinmcginty101]

Excellent instruction. I'm studying for the Advanced Amateur Licence (Australia) right now and videos like this one are a great help. Thank you very much.

[@bunkie2100]

Simple, elegant and efficient. That’s about as good as an explanation can get. Well done!

[@landondyer]

I appreciate your clear and uncluttered presentation. As a software engineer getting back into electronics (after a 35 year hiatus...), it's videos like this that help bring back the tinkering skills I've forgotten. Thank you.

[@overengineeredinoz7683]

This video explains the concepts so clearly and concisely. Perfect really.

[@billbates7810]

A very good video, even down to the camera tracking your pen as you moved from circuit to circuit… very impressed! God bless, Bill.

[@Roy_Tellason]

Many years ago I ran across a circuit in a magazine (remember those? :-) that I just had to try out. It was a single transistor in a common-base configuration that allowed me to use a small 8 ohm speaker as a microphone. Worked well, that did! So that's not just "mostly RF"...

[@dennisvirmudes366]

This was a great tutorial for transistor amplifier connections. I never expect it open my mind to deeply understand the connection and the effect of changing the value of resistor as you did in common emitter. Your 11:08 is very valuable for me.Thank you very much

[@AppliedScience]

Another great explanation! I had never thought about cascode amps like that, but it makes a lot of sense. Have you ever worked as a teacher/tutor professionally? You'd be the best!

[@hadireg]

Coming from Applied Science that's the best recognition one can have 🙂 Thanks for your great channel you're making the world a better place👍

[@UberAlphaSirus]

I should comment on your videos more often, as you are awesome. You really fill a niche nobody else covers as well and concise as you do I was wondering where the term "common" originates for these setups and also so I am never confused again, what are all the other names given to these circuit that mean the same, such as emitter follower. Thanks again.

[@starlight8260]

Wow, yet another superb video..simply the best set of electronics tutorials on KZbin. Hats off to you sir!

[@ronaldlijs]

VERY VERY well explained, it's like magic. This directly relates to schematics I've seen for RF circuits and it makes it easier to understand WHY the different setups. Keep them coming Alan!!!

[@Radionut63]

Now this is teaching! Thank you for uploading! :-)

[@RobeenaShepherd]

Just a quick thanks for your really helpful explanations and demonstrations. I understand more in a 10 minute video from you than hours of formula obsessed textbooks. :)

[@trialen]

You are an uncommon teacher.

[@ChueyMr11]

You are awesome, clear and precise, You didn't stumble once or pause and mutter Ah-Ah.Now I understand the miller effect. You explain this better than a college professor.Good presentation, thanks

[@jimmylightfinger1216]

Succinct and well paced. Nice to have the book and lab in combo...separate classes often have a different feel and temperaments especially when lab partners have not done any preparation.

[@roseelectronics4582]

You got the best tutorial basics of transistors! No one else seems to show the real thing. You got both! Great video! It helped a ton.

[@chrispychickin]

Thanks very much for this video, it was really insightful and helped my understanding of these circuits a great deal. I think it would be great if you were to scan in the pages of tutorials like this, and post them online, so that the viewer is able to "play along at home" and have them for further reference. I for one would really appreciate it! Thanks for the great videos, you're an excellent teacher and have made so many concepts make more sense to me! peace chris

[@chuckvanderbildt]

Clear, concise and well structured explanation. I am impressed, thank you for making these!

[@Ragingwasabi9000]

The content u give is so thorough and wholesome. solid lesson, thanks so much!

[@1ebutuoy2]

Great video! A common base amplifier is also great as a preamp for a low impedance microphone. Low noise, high gain.

[@zarserz]

Thanks, love your videos. By far some of the best electronics explanations/tutorials on youtube.

[@1903A3shooter]

I never get tired of watching.

[@bobvincent5921]

A good refresher course,amazing what I forget over a weekend.

[@johnny7254]

Awesome video -- as a beginner, this sort of explanation is priceless. Many thanks.

[@justinbills5973]

way to break it down in a clear, easy-to-understand manner. cheers!

[@mddanishakhtar9025]

Really you are awesome teacher ever ..... because you are teach with practical....so I humbly request to you jast same type video upload all time... please please please...

[@rpsproject5349]

I know that this video has been around for some time but it has been really really helpful.

[@mdesm2005]

Very nice. This 11 minute video probably took you 11 hours to prepare. Impressive. Thanks. I like "rules of thumb" for using one configuration versus another. Please consider comparing BJTs to FETs (to Op Amps?) in the future.

[@uuyoubaan4uuyou829]

I​ got​ terrble grade on​ my​ electronic​ course​ 20​ yrs​ ago.​ I​ wish​ you​ were​ my​ teacher​ back​ then.​ I​ would​ have​ love​ electronic.

[@MegaHelen29]

I am so grateful for people like you who spend time instructing others. Please excuse my ignorance, but what are you referring to when you talk about common? Many thanks.

[@w2aew]

+John Wilde When you say Common-emitter, Common-base or Common-collector - you are referring to the terminal that is NOT carrying the input or output signal (it is the common reference point). Thus, for a Common-emitter amplifier, the input is the base and the output is the collector, etc.

[@MegaHelen29]

+w2aew Many thanks! I am getting there, albeit slowly. You are a great patient teacher.

[@omarel-ghezawi6466]

Excellent exposition. Good effort expended in your videos . Well done. Thank you.

[@N0SSC]

Ooh...I could have used some of this for my Electronics exam this morning. I love your videos!

[@IIeTpOc9H4uK]

Perfect video! THanks you a lot. It is very clear and I like how you showed the example on the oscilloscope right away.

[@phanimalladi9270]

Ideal.Best way to learn by practical approach, lesson to future. Thank you SIR.

[@TechneMoira]

Finally a clearcut explanation about the common and different aspects between the three BJT configurations. Might I suggest to maybe give a short explanation about the use of coils (and capacitors), say, in a common emitter configuration, inspired on the same philosophy of this specific video?

[@theviking6593]

thank you so much for this video i love the way you explain how CB,CE,CC works. nice job BRAVO

[@freon500]

I am much obliged for your kindness in preparing the videos and sharing your knowledge. I've been putting together the circuits you present and have been having pretty good luck with them, though I'm getting clipped low end sine waves above 1K htz. Is it impedance problems, is it a voltage attenuation? What to do? It is surprising how a small change in the value of a component often makes a circuit unstable or worse

[@shaqywacky]

Great video! I just learned this in class it it was awesome to have you wrap it up.

[@優さん-n7m]

WHERE TO FIND THE DETAILS....?? You explain the best way.

[@soulmate07748]

Excellent explanation and tutorial!

[@absurdengineering]

For an emitter follower, it helps to stabilize the collector current with two additional transistors. That way the B-E voltage is constant, the gain is closer to 1, and the already low distortion is even lower.

[@anurasenarathna1703]

Great video. Very nicely explained.

[@CoolDudeClem]

I've never heard of a common base amplifier before. Common collector and common emitter I already know, but not common base so I learned something today.

[@TheQasim222]

Dear Sir you give us a lot information in your tutorial i like it very much thanks

[@Nermash]

Great explanation, very nice balance of basic things with some more advanced info.

[@Avionics1958]

WOW WOW WOW a BIG thank you. I really appreciate all your videos but the BASIC one are out of this world. My hat off ! :-)

[@hadireg]

awesome demo, especially for the common base. Thanks fot the great content sharing!👍👍

[@benthere8051]

The common base is the hardest for me to employ.

[@bassemkhalid6876]

An Excellent Tutorial. Thank you very much. Keep the good work on and if you have some time for different types of multivibrators , it would be really good. Thanks in Advance.

[@shishkumar6042]

This was my first video from your channel and man, from here I can only imagine how much wisdom and knowledge you would have ... So that's why I wanted some guidance - Can you please share some good sources ( books, vids, anything...) for getting the vast knowledge of electronics ? I know experience is a very important part of learning in this field, but here is the thing, how can you get experience if you don't know anything !? I mean How to start ? How you started ? Plz Help this generation of new Electronics Enthisiasts. Pardon my awkward English. Thank you.

[@w2aew]

Learning is a lifelong process, and it is a different process for everyone since everyone learns things differently. Some people learn best by reading, others by seeing, others by doing. For me, it has been a lot of reading and a lot of doing! When I was a teenager, I poured through the Engineering Notebook series by Forrest Mimms, striving to understand the circuits in them. I worked in a TV repair shop while in high school and learned a lot there. I experimented a lot with electronics, and still do. I also loved reading analog Application Notes from the old National Instruments, Analog Devices, Linear Technologies, Texas Instruments, etc. linear IC manufacturers. Still love books like The Art of Electronics, as well as old books like the Op Amp Cookbook, etc. I studied and received a BSEE degree and have spent the last 35 years in the electronics industry as a design engineer, test engineer, product engineer, validation engineer, application engineer, etc. So, for me there was no single, simple path - it has been (and continues to be) a lifetime of learning - through reading and experience. I can't over-emphasize the power of experience. Start experimenting, keep experimenting - you will fail and fail often, but you LEARN much more from your failures than you do from your successes - so don't let failure discourage you.

[@shishkumar6042]

@@w2aew Thank you very much for your kind words and your time. Very motivating.

[@tunicana]

Beleive me, you have a gift to explain electronics.

[@skjangra1]

Best video I have ever seen on transistors 👍👏👏

[@tecnico360]

Thank you! Very clearly explained and shown experimentally.

[@21thTek]

love your videos, always learned a lot in a short period of time, winner tutorials !!

[@chrispychickin]

I second this! I'd love to have an in depth explanation of input and output impedance. keep up the great work! peace

[@joblessalex]

Thanks for the tutorial! This is going to help me a lot designing my amplifier.

[@yannickvanderhorst3485]

Thanks for the good vid man!!! Im in 4th grade and working with transistors for the first time! Helps me alot!!!

[@JacGoudsmit]

This brings back a lot of knowledge that I'd forgotten about since I dropped out of EE school... Especially the common-base circuit. Aren't common-base circuits usually drawn with the base facing down, and aren't common-base circuits also common (pun not intended) in power supplies? I seem to remember seeing and using circuit diagrams that extend the maximum current of a 7805 by letting the 7805 control a 2N3055 power transistor in common-base configuration.

[@kparasu12345]

Very good ... please post for FET & MOSFET also

[@rawtuber]

please do!

[@Radiowild]

Excellent video! Now I know what to do with all those hunks of silicon with the wires hanging out of them I have behind my stacks of tubes in my basement! You've managed to "wake up" things I learned years ago! RW

[@Paul_VK3HN]

Excellent explanation, thanks, perfect primer before starting on EMRFD.

[@deepakitteera9538]

Thank you so much for making my concepts more clear...

[@stoneslice]

Another outstanding video. Useful information for all. Thanks.

[@snaprollinpitts]

whiskey two alpha echo whiskey,if you are not an electronics professor you sure could have been. as always a perfect tutorial right on the money!!!! thanks

[@w2aew]

I am not an electronics professor - I just play one on KZbin! Ha!

[@snaprollinpitts]

***** I am very grateful that you do, you have taught me so much already. I really like you tutorials, I learn more from them. thanks

[@lowellyates7404]

I wish I had him Navy Electronics Technician School years ago.

[@incxxxx]

good job! I obtained the reverse. For common emitter the phases of in and out are the same. For common colecter they are shifted by 180 degrees and the same intensity.

[@현정호-h4d]

Best explanation , i think yes, thanks for making this video

[@microflite]

Great video. Minor error you might want to fix with a caption - at 5:51, you said common emitter instead of common collector. Thanks for the great series.

[@BartholdyManuel]

Thanks a lot, greetings from Argentina!

[@saarike]

Very nice videos with full of information - thanks!

[@jeditoto3441]

Hi Alan, - could you explain the role of Emitter resistor (degeneration or "negative feedback") in a video - this confused me a lot when started learning about the different configuration. I am sure many people would benefit from this :) - especially with the great way you have of explaining things!

[@ToltecMerc]

At 5:50 you say Common Emitter but I think you mean Common Collector. Thank you for a great tutotial.

[@w2aew]

Yes, you are right. Good catch. At least I properly stated it as a Common Collector amp in the rest of the segment.

[@1959Berre]

+ToltecMerc I just wanted to make the same remark, since I checked, I noticed you already did mention it. Good catch :)

[@Gw0wvl]

I think he just said that so as to make sure you were paying attention :-)

[@bluehornet6752]

@@w2aew I noticed it too--but you can read the words "Common Collector" on the page (because you just finished talking about that form of BJT), so it's pretty easy to follow what's going on. Awesome video though--really helpful to see the signals: Common emitter (inverting) vs the other two (non-inverting). That's incredibly helpful, so thank you very much for making this video!

[@hanndoddi]

Thank you for a very well made tutorial :) Are those glossary notes you are using accessible somewhere?

[@xyloeye]

Yet another great review. Thanks, Alan.

[@Evmeister88]

Very helpful! Couldn't find a better video that broke it down like yours did. I searched your site, you don't have any more in depth videos on how the BJT works do you?

[@w2aew]

I've got a few more that use BJT transistors - like one that talks about frequency response of a common emitter amplifier, and another that talks about BJT differential amplifiers (long-tailed pairs), and more.

[@ismailcemtuzun6535]

amazing explanation ! thank you

[@80sday36]

Hello Sir, that is the best teaching method I ever see. Anyway, what transistor do you used in this example and what is the maximum frequency that the transistor can handle? What transistors should I use to amplify small signal with the frequency range of : 17MHz up to 47MHz?

[@w2aew]

I just used general purpose transistors like 2N2222A or 2N3904 in this video. The maximum frequency of operation can be limited by a number of things. Usually it it the surrounding circuitry that limits the frequency response, and not the transistor's parameters like fT or Fmax alone.

[@teberer3246]

With class C RF amp, can you explain how it can be used/ modified to an AM or FM transmitter, BTW your tutorials are very clear and easy to grasp.

[@rolfts5762]

-->Thank you very much for very very nice interesting and educational videos. 'This' video in special, contributed a great deal for a big level-shift for undersigned. Previously only used and known about the ordinary common-'emitter' configuration. ...Now the common-collector(/emitter-follower) config I would guess have a beautiful potensial in own designs. Looks like OpAmps and com.coll.'s(perhaps driven via a driver first?, if current-sensible), seem to have very nice potensials in elelctronics. Again, thank you Alan. br, from Rolf scandinavia, norway. La3epa -thoughNotSoMuchActiveOnHf..for the moment. (Hope one day perhaps try make a hf-contact with you, when practical-conditions for it allows from here later in the future.)

[@goldlover5915]

Great teaching tools as always.Would be nice in your video's if you would show how the test Leeds are hookup to test equipment so i could preform the test's also as you only show the board.Would be great if i could download your notes

[@josephwarren849]

Great video very helpful, more like this would be grate.

[@TonyButchT]

I appreciate and enjoy this tutorial very much, Thank You!

[@joshuamartin4837]

Brilliant! Thank you so much.

[@chickennugget3362]

Best explanation I have seen! 73's

[@marcisberzins]

In Common Emitter amplifier configuration it can be seen on scope that when bypassing the Emitter resistor along with huge gain increase there is also more signal distortion, as it should be. Thanks.

[@sunpro9146]

Thanks for even including the drawings!

[@jamesmasonic]

many thanks for great way of teaching. we would be very glad if you also make some basic demos on oscillators 555 timers, multi vibrators, basic am receivers, schmitt triggers opamps ect.

[@w2aew]

+jamesmasonic I have some videos on many of these topics already...

[@maurosobreira8695]

Excellent intro tutorial on the amplifiers, Alan! I got a question on that: On the cascode amplifier, the signal passes through the common emitter amplifier first and then passes through the common base...so it seems that the bandwidth reduction effect is still there on the first stage. Is this effect reduced just because the voltage gain (Av) for the common emitter is minus one on the cascode configuration, or something on the common base prevents the inverted signal from being coupled back by the capacitor effect and reduce bandwidth?

[@w2aew]

mauro sobreira It is because the voltage gain is reduced to -1 on the common emitter stage. This minimizes the Miller Effect. The Miller Effect is the multiplication of the C-B capacitance by the voltage gain. Since the magnitude of the gain is unity, the C-B capacitance doesn't get multiplied like it would in a single common emitter gain stage (without the cascode).

[@maurosobreira8695]

***** Crispy clear, Thanks!

[@tonybell1597]

Another excellent tutorial, still not clear about the common base amplifier though, not sure I understand how the transistor works by connecting the signal to the emitter.... Time to hit the breadboard!

[@lucaslucia7126]

Thank you! This helped me so much.

[@SujeetKumar-lv2dd]

The best ever explained..! Thanks sir