Small Signal Amplifiers

[@stever3886]

seriously. ……..this 50 times the quality lecture than ANYTHING i ever got in college! time well spent watching this incredible video !

[@sandasturner9529]

Sometimes the the best things in life are paid by someone else/free to you!

[@chrisdorman-c5r]

Whatever his name is he has good way of explaining how electronic devices function. I guess I hope other people someday think I have this knowledge. American culture, the economy, and my relatives have been able to make me feel like a failure. The misery is always intense. I am wondering if there is a way I think that has been causing me to be a failure. I watch vehicles being driven around me all day. I do not have one. I do not have an apartment or vehicle. I completed a BS in mechanical engineering in 1995 from the University of Arizona, and an MBA from the University of Phoenix in 2001. I was in the Navy in the midst of that, leaving in 2000. The two female navy pilots of the EA 18 G Growler remind me of what my naval career could have been. I have always had aspiration to learn to fly, and get a pilots license. These women got qualified to fly a complex airplane in their 20's. I think I would tend to feel inferior to them, have an inferiority complex to them. American culture treats me like I know nothing, and I even feel terrible around my immediate relatives. It really is not good.

[@jitsinghobhi]

I have very rarely met a person whose concept is so clear in teaching, master of his subject, full regards

[@boeing757pilot]

He's absolutely incredible..

[@Swanicorn]

This is brilliant. The fact that you even mention the different faults in the end helps so much.

[@bobs_ya_runkle]

Thankyou! I am an electronics novice and I get very frustrated by so called "learning" channels who don't explain what functions individual components are doing in the circuit. This is brilliant! I have subbed.

[@eitantal726]

All about electronics' Piano of Doom

[@bobs_ya_runkle]

@@eitantal726Thankyou!

[@PaulSmith-tt2cy]

I'm an electrical engineer with 40 years experience and I watch videos like this to help me understand how I can help my students better and you know I just saw your video man this is awesome

[@sandasturner9529]

Thank you for your service

[@RFVisionary]

A nice journey back in time to my apprentice years. I had already forgotten a lot of things, so I watched the entire learning lesson. Well explained, down to the last detail (necessary transistor tables, etc.). As an apprentice back then, a course like this would have made a lot of things easier for me. Thank you for the “excursion” into the technical youth ☺️. It appears that this knowledge is actually still taught today (according to some comments here). 👍🏻

[@flipvansaksen774]

Amazing lecture. Starting from scratch until the full circuit. Congratulations. I wish I had you as a teacher years ago 🙂

[@RobbyMatthias]

As everybody else has said; A 'brilliant-lecture' that is 'highly-informative'! Bravo!!

[@BrightLibra]

I remember these days of lecturing. This fellow really knows the subject. He shows it by telling us (his students) practical uses for the information. Most would just say, "The signal is amplified through the addition of a resistor here, and then one here on the negative side of this AC input." He could just stop there, smile, and take a sip of coffee. But, no - he really does know, and he wants us to know too... so he shows things would be like if this shorts, or this opens. I was enthralled through this entire lecture, and certainly plan to see as many as I can. Thank you.

[@stargazer7644]

That's because this lecture isn't aimed at circuit designers, it is aimed at technicians who will be troubleshooting the circuits.

[@ta6hbe]

Excellent demonstration and lecture. Thank you very much for your contribution. I studied Electrical and Electronic Engineering at my undergraduate degree, about 25 years ago. You are the first lecturer, I have ever heard, that actually clearly explained why a transistor arrangement like this, actually has inverting characteristic of the input signal voltage. You are a brilliant teacher, as far as I am concerned. Thank you again!

[@TheAnimeist]

Best practical description of amplifiers I've heard yet. The troubleshooting was icing on the cake.

[@masterchain3335]

Oh wow, this was the explanation of transistor amplifiers that I've been waiting for my whole life. I've seen some great explanations about the math and calculating the values, but I've never really understood why any of these resistors are even there in the first place and what effect they actually have on the circuit.

[@miguelmouta5372]

This is real expertise in electronics and in teaching. Congratulations Sir.

[@ericlindal8008]

Great lecture! A natural teacher. Awesome explanation of the DC blocking properties of a capacitor, you often hear of isolation and ac coupling in instrumentation . I spent much of my career in the lab dealing with instrumentation, various transducers, and digital signal processing. Instrumentation amplifiers are so important in testing and prototyping systems. Luckily I could just pick out an Instrumentation Amplifier IC from Analog Devices. Usually requires positive and negative voltages to power the chip

[@ГаджибекЭминов-м2ф]

Учите русский язык. Ничего не понятно

[@georgeg.4943]

Any aspiring novice getting started in electronics should see this video. As a former instructor and engineer I was absolutely taken aback at how elemental and complete basic instruction this video is. This is the epitome of Transistor Design 101. Takes me back to my days in 1962 when I started my transistor engineering classes. Great work.

[@daltongrantham9729]

Wow. What a teacher. Absolutely stunned at how simple you made this to understand

[@G0USL]

Excellent explanation, I learned small signal amplifier design 40 years ago. This was a great refresher. Thanks again

[@locustvalleystring]

You just cleared up decades of fuzziness on those small-signal amplifiers. Spelling out the individual component functions helps a lot. Thanks.

[@pboston6RR]

I have been using the 2N2222 for years as a switch and now I find how 8t works as an amp. Thanks for a great explanation.

[@thelongislandguy]

Also look at 2N3904. It has the same gain as the 2222 but at lower current.

[@sophiestabilitronics]

Excellent lesson, master! Thank you. A supposedly week long lecture about transistor biasing was discussed by you in this almost an hour video. Very clear and concise. I also learned new, why that capacitor on the emitter side should be there. All the best!

[@pasanwaidyatillake5758]

He is going so deep on the topic... Wonderful

[@noelpalacio5634]

I studied electronics about 30 years ago and graduated with honors. I can honestly tell you that you are one in a billion. The way you explain the circuit and answer all the questions that pop into my mind as I am listening to your lecture, leaves all my teachers in shame. E😊xcellent description of what is going on in the circuit. Thank you.

[@ColocasiaCorm]

Can you shut up

[@pierusa123]

I used this circuit with a coil and variable capacitor to make a simple radio back in 1967. Thanks for the lecture.

[@georgeh1352]

Crystal clear lecture, couldn't be better. Good to do a recap of things you learned (or thought you learned) many years ago.

[@certuv]

Thank you very much. In my retirement I am making a hobby of fixing radios' amps and sometimes old computers. You have explained clearly the circuits to me.

[@garygranato9164]

this is the most descriptive explanation of the a transistor amp i have found so far. thank you for making this video.

[@MrDoneboy]

This video is by far your most complex, Bob. Especially, since you said trial and error, is the best way to determine the component values!

[@MrComenD]

You are really good with it. Best lecturer on the planet.

[@MrAssembler]

I really appreciate the Troubleshooting part at the end, troubleshooting is where the thinking and understanding happens.

[@Tetrakan]

Great lecture. And I’m so impressed at how, in a video delivered more or less like a real lecture with almost no editing in postproduction, how infrequently the speaker says “um” or “er”. Master level public speaking and teaching skills!

[@robertpeters9438]

This is the best description of transistor operation I have seen.

[@stevefoster2700]

I have watched many, many hours of electronics tutorials and this is the best at explaining what the components in a common emitter amplifier actually do and why they're needed. I'd enjoy seeing videos on the negative feedback circuit and differential pairs.

[@TheGspencer]

I highly recommend your videos to anyone who needs to establish a solid base for learning. Very refreshing and informative to watch.. I especially enjoyed the problem solving which reinforces the learning. After 60 years (at 81) I still truly love electronics!!!

[@richardlynneweisgerber2552]

Turning 69 this month, with a newly-rekindled, though not quite free of external crabby people getting in the way of my rebuilt workbench, two9 power supplies arriving soon for Analog and ESP32 & maybe some other stugg. Back in 2020 I re-arranged my budget, managed the most severe case of G.A.S. {Gear Acquisition Syndrome, part being an echo from '69 or so, '72ish more likely, "Yes"'s use of Eventide's massively impressive "Musical Instrument Effects", Harmonizer, Pitch-Shifter. all that. Now I just had to get all four of their "Factor Stompboxes", ZOIA & Beebo & Mbira w/pickups. and a Dobro, all sorts of MIDI Controller gizmos, i went crazy four ars straight, Reverb banned me for life., two three years to learn it all now. phew/ my mom always said I was not raised right. well once ;-) Alll just so I can have this huge driving force, "Get the workbench together, nobody sells the matrix mixer I need to loop them. So qty 100 LM13700 and a whole bunch of supporting cast members. KiCad 8 being out now, larn that to PCB. My Childish Grandiosity Gland is nearly as big as my Empathy Gland is. Underneath all this is this Conspiracy that I invented, 50Hz & 60Hz the AC Power Grid runs on has been hypnotizing folks for ages and ADHD has me doing nothing but watching videos or reading articles of other folks doing it, So, now I have to dig around and kick-out the 'living vicariously on others' successes" or worse Take Care What sorts of experiments do you do? RISC V is gardangblang tempting to switch to. after 2/3 of my life's avocation was in Micro$oft's pocket, literally for 13-14 years tech support then device testing testing the tests that test the devices . in closing, since Apriil 12, 1861, then re-doubled January 6, 2020 The Central Column of OUR Flag Pole has Indelibly Etched upon its Entire Surface; “The Preservation of Life, & Liberty, & the Pursuit of Happiness” The Right Face of OUR Flag has Indelibly Etched upon its Entire Surface; “The Preservation of Liberty, & Happiness, & the Pursuit of Life” The Left Face of OUR Flag has Indelibly Etched upon its Entire Surface, “The Preservation of Happiness, & Life, & the Pursuit of Liberty,” Formerly-United State Of America HAS NO CONSTITUTION beware the fake XR2206 function generators on eBay, Aliwhatchits, temu, all fake, most likely the close-cousin ICL8038 function generators are phony as well. i saw a couple by one guy that nearly had them sorted-out, beginning like always, "Datasheet(s)? Check, BOM in this kit? WTF! some parts are 10x what they aare specced to use., but it remains more a document to his gradually realizing, "something just ain't right with these chips." lm13700 are for the VCA at each of the two by eight inputs mixed through 8x8 Crosspoint VCAs here Outputting to a pair of eight Attenuverters, for Audio & CV for modular synth use. a thing stuck in my todo list for twenty-plus years, we'll see , but there are plenty of tools & parts, not like '82 when the Heathkit Analog and Digital Electronics kits had me integrating Boolean Algebra in with the language bits shifting bits in Venn Diagrams and Karnaugh Maps. a note to close on shhhhh i got to press play on this teacher, thanks be safe

[@R.Akerman-oz1tf]

Could have done better, but the lesson was well done; in any event.

[@barryfandango863]

This is great. Thankyou. After years spent try😅ng to understand this stuff you bring a real clarity to the subject.

[@robertgast5953]

Ive been busting my brain trying to figure out transistors as amps, turns out most of my issues were using a circut like the one in the first half of this video. Not a single other person has told me its almost impossible to calculate predictable repeatable results using the first circut shown here.. Best explatation of common emitter ive watched!

[@velvetdoug]

"Except it can't work" This is a fantastic video. Thanks so much

[@mickduprez9598]

Finally someone who takes the extra time to explain 'every' component and how/what it does. While most watching these type of videos probably know the basics of how each component works, most presenters assume a lot and are more 'hand wavey' with their explanations or just focus on a particular component (like the transistor in this case). I had more than a few light bulb moments watching this (finally!), excellent job and thanks!

[@marvelupthrustenforcer3573]

one of the lectures i have ever had on small signal amplifiers.IT HAS NEARLY ANSWERED ALL MY QUESTIONS IN JUST ONE LECTURE

[@PaulSmith-tt2cy]

The straw is such an excellent analogy of the transistor because what you're doing is pinching the bass diner in majority carriers and I like your fact that I really like the example of the minus sucking instead of the positive pushing makes a lot more sense

[@eolhcytoos]

Clear and concise presentation. I particularly like the way you reinforce the understanding by briefly revisiting an earlier explanation of the said part. Probably the best explanation of small signal amplifiers that I have come across. Excellent!

[@daveb7999]

I sure do know a lot more about small signal amplifiers than I did before watching this video. Thanks for this great lesson, consider me subscribed! You really do have a way of explaining what is going on in these circuits. The circuit really makes sense now, remarkable! Thanks again!

[@Kevkimkayla]

No words to describe how grateful i am . Ave been dying to make my own fm/am transmitter to switch things wireless n have some fun but failed terribly.after watching this content,my hopes resurrected I got a revelation. do me a favour pliz, continue to the fm /am modulation part. I can now amplify my mic signal n the colpitts ascillator effectively, thanks alot

[@smaransuthar663]

Thank you, the first video that actually explained it in depth.

[@tn7198]

I've been trying to learn about audio effects, starting with transistor based circuits for boosting a signal, overdrive, etc. It has been surprisingly complicated! This is one of the best explanations I've found in the last 3-4 months. Your explanations are outstanding.

[@naris7572]

This is brilliant. A super practical lecture from an experienced one telling the the things with a simple and intuitive words. Admired.

[@Tyler75D]

Absolutely the best video I've found on this topic!

[@muratkaradag3703]

Finally a good video that explains a circuit, and what happens when you put certain devices into it and what effects it has! I think most of us know the single devices and how they work, but only if they are alone, not if they are matched together!

[@josefbuman7907]

Best explanation about the working of an ssa I ever heared! Great video!!!

[@elboron6774]

As an eletrical student this is by far the best video I have ever watched, thank you!

[@camilac167]

Wow, outstanding explanation! Thank you so much professor. I can finally understand this concept.

[@hankosaurus]

Very useful lecture. Thank you! I was a little puzzled by the positive current flow perspective at the beginning. I was taught that electrons go from the cathode/emitter/source to the plate/collector/drain and are attracted to (sucked to, so to speak) the positive terminal of the B+ battery. Hearing that the current was sucked towards ground got me confused for a few seconds while I sorted out your perspective.

[@NedBoukharine]

Thank you very much for this luminous exposition of the subject. I have taken electronics courses in college quite some time ago, got excellent grades, but never reached this level of deep comprehension of the topic after listening to your lecture. My understanding was based more on rote mathematical heavy guns rather than the pragmatic simple method you use. A testimony that a good teacher is hard to come by and he can make a big difference.

[@vikenemesh]

Thanks for displaying the phase inversion fault at the end!

[@georgeadeka7984]

This 1000 times better than what I went through. I am beginning to believe our lectures never mastered what they taught us. They were just teaching by memorizing

[@boeing757pilot]

I've always believed the same. Many teachers explain things mathematically because, I believe, they don't truly understand conceptually.. This guy is incredible...

[@williamwalker8107]

I like that after all the explanation of the amplifier circuit at about 1/2 way through the video he stops, looks at the camera for a moment and states "except it can't work".

[@ericlindal8008]

That guy explains everything, great lecture.

[@Skibidi_Male_X]

Like my father explaining how life works... Then says ..

[@laetitiazichy-vanlidth5882]

Waiting for that😊😅

[@henrypfister2902]

Yeah that was funny

[@mcameron63]

It’s important to understand that voltage does not flow. It is just a measure of potential energy between 2 points. Usually between a node in the circuit and ground or between 2 points. Current is the flow of electrons (or holes depending on how you were taught EE). You must have a potential (voltage) between the 2 points in order for current to flow from the first point to the other. A load is usually placed between the 2 points to perform some function. A resistor is a load used, for example, to keep the current between the two terminals of the battery from quickly draining the battery. So when he says there is 10 volts at some point in the circuit, he is implicitly saying there is a potential of 10 volts between the point and ground.

[@beatlessteve1010]

I loved the lesson, total flashback for me of when I enrolled at ITT-Technical Institute for an EET Degree back in 89". You reminded me of my Electronics fundamentals teacher Mr. Kotwika, who was a long-time Navy instructor and began teaching in the private sector at ITT.

[@paulschumacker9901]

Another advantage of the emitter resistor is that it dramatically increases the input impedance looking into the base. This is really important when trying to amplify a signal from a device with a high output impedance, such as a dynamic or ribbon microphone.

[@pinoytechniko_77]

This is You tube university ,and you are our professor. I did assemble a mic (wireless) some years ago and it was a good learning experience. This video reminds me of that.

[@frederickbowdler8169]

A great summary of amplifier design principles.

[@boeing757pilot]

Absolutely excellent. Such an INCREDIBLE teacher.. Just wow!

[@guilletrost1319]

your presentation was very clear, especially for those of us who don't speak English daily.

[@particlecloud]

This is very good. I have minimal electronics knowledge, never understood much about amplifiers beyond basic transistor operation. The tutorial was easy to follow and I now know a lot more. The logical step-by-step build up of the circuit is an excellent approach.

[@amrhafez8369]

Excellent explanation. I remember learning the same principles from stogy texts explained by stuffy professors. This is much more clear and simple. Of course I would rather use FET's, but I always struggled with BJT circuits. Thank god for op-amps.

[@binuabraham3875]

Sir, Thanks a lot. For this great lecture. Keep posting such greatful lecture. God bless you.

[@joseantonioteixeiraazevedo5166]

Amazing! Impressive! I've never seen anyone "reason" circuits this way! Thank you very much.

[@jw228w]

great video.the whiteboard and eraser is a game changer by taking away components that are not necessary for the instruction at the moment. John

[@mscir]

Great class, thank you. If you ever decide to use a signal generator and oscilloscope to demonstrate gain and distortion, etc. that would be a welcome addition to an already great class. Thank you.

[@KeithRowley418]

I remember learning this way back in 1973 in 1st year college.

[@mitchnn]

Wow, finally understand how transitor work!!!!

[@jriver64]

Thank you for your generous giving of your knowledge. Awesome video.

[@MattFieldPhoto]

This is an absolutely excellent lecture - well done

[@searchin4music]

highly qualitative and helpful content - 10 thumbs up to you Sir!

[@raymondjackson6069]

Thank you. Guys like this make this world just a little better! One learning video at a time...

[@jrsolomon5960]

Best lecture on small signal analysis

[@ric8248]

This is an absolute masterclass.

[@hacksontable5850]

This is by far the best explantion I have ever seen on this topic. Thank you very much.

[@ernestb.2377]

I like your practical teaching style. 👍

[@davidjackson2115]

Thankyou for your time in sharing yr knowledge. Fully explained. explained. Ill have to rewatch with more time and care as my mind was thinking if you had the bottom side resistor and not the top then it would be in phase. Im wondering about mosfets. And thinking of a circuit that switches at a frequency say 50khz and feeds the ac signal through most then shorts out the 50khz - im thinking how they do band width modulation. Ill have to check yr site, but if not can you do such a comprehensive vid on bass and trebble, Ive always hated the graphic equalizers as in the studios they like have a hundred etc... so here is public joe pissing around with his 5 or 7 band wheres the old bass and trebble with loudness sounded much better and quicker / simple to adjust without screwing the sound completely up. Also - the "magnetic amplifier" Ive always dreamed of building my own amp with something like six amps, 2 bass / 2 mid and 2 trebble with the two amps split, one value and the other amp transistor and being able to adjust between the two and I figure you adjust the three twins with the balance of tone between valve and mosfet with a Master Volume.

[@davidmukege6967]

Can't find more likes to thank this lecture. Its soo imformative. Thank you. +1 new subscriber

[@johneagle4384]

Thank you! We all see these circuits with resistors and capacitors, but no one explain their function in the circuit.

[@王錫九]

Very comprehensive to introduce the concept of circuit design

[@jhoncharlesdf.1599]

..from last comment, Yes Its a amazing explanation, any people can learn from your channel Mr Teacher!!, very nice to listen!, thank you!

[@karanahuja6302]

Very Very interesting and informative video. Thank You Sir. 😊😊

[@PrincePloppy]

Really well explained. I subbed. You are a great teacher. I'm 4 years into learning electronics, so am always regoing over what i've learnt. You help make this clearer.

[@AKKJ420]

This is so good. I'm beginning to like electronics again

[@Gary-ts6dh]

11:09 - Wow! I wish I could draw a schematic that quickly!

[@daveharveys]

Really like your practical approach to problem solving. Transistor calcs are very long winded and as you point out very rarely work in the real world due to variation in tolerance.

[@JAFOpty]

some people were born to teach this is amazing!

[@danstark462]

That was a lot of information and insightful. I learnt a lot. I am saving this in my electronic folder.

[@antonnym214]

Thank you for the suction idea as an analog to explain resistance. I understood that just fine.

[@edwards045]

You are the Greatest teacher ever. Thank you very much

[@youtubeaccount931]

Thinking about the circuit in terms of both AC and DC components was a breakthrough for me. thanks!

[@keyd33]

I wish he was my electro teacher back then 25 years ago, instead of someone that went into Bode diagram intersections when you did not even understand how a capacitor was working... :D

[@LISANCACOM]

Excellent, thanks. Your education skill is amazing.

[@sharpnote1480]

I learned electronics in the Navy. The Navy taught electron flow. Of course, college taught hole flow. This video is teaching hole flow. Both work but I am danged if I can just switch back and forth quickly. Because I am old, we were taught electronics using tubes. It was easy for me to visualize the electrons flowing from the cathode to the plate. Then we were taught transistors. The transistors instruction used hole flow. The instructors didn’t have a clue about hole flow so the instruction was very weak. However, I realized that everything worked fine if one viewed the emitter as the cathode. As a technician everything was good.

[@janbill79]

he must of had the radio shack 130 & 1 science kit. and wondered why those resistors and capacitor are always on terminals of the NPN and PNP transistor's in the circuit amplifiers you build . They gave explanations ,some times, but in this depth.

[@alguti2000]

I'm familiar with signal amplifiers, although I normally use op-amps. I use formulas from the datasheets to determine values for resistors and capacitors for the circuit behavior I want. However, I really didn't understood how all of these physically works. That is, until I watched this video. If I wish I had a professor that explained it like he does -- formulas would've made more since back then, making them easier to learn.

[@peterjansen4826]

I wish that most teachers at a university would have his talent of teaching: understanding what is and is not logical to newcomers in the subject.

[@hotjanin1988]

Thank you for an excelent explanation on how does the circuit work

[@Rospajother]

Impressive lesson, chuckled when you said you can design or just build it

[@laurencehand12]

Very good explanation. Thank you! You've earned my subscription.