00:00 : Introduction 00:30 : Class A Amplifier Theory 02:30 : Class A Amplifier Simulation 04:57 : Class B Amplifier Theory 07:15 : Class B Amplifier Simulation 09:05 : Class AB Amplifier Theory 10:45 : Class AB Amplifier Simulation 14:04: Class G Amplifier Theory 16:00 : Class G Amplifier Simulation 18:53 : Class H Amplifier Theory 20:10 : Class H Amplifier Simulation 22:16 : Class D Amplifier Theory 23:39 : Class D Amplifier Simulation

Really happy I discovered your channel. Top notch content!

Great description of the various amplifier classes. And the LTspice examples really brought it to life. Very well done!

A really useful summary video! Classes G and H were new to me! 👌

@FesZElectronics

2 жыл бұрын

I guess there are a few more classes, I'm not sure what the last one is, but its definitely not H.

great explanation and great video as always

Wow... Thank you for this great explanation

Great job.

Thanks again for these simulation and circuit videos, these help so much. I knew I was learning more when you were explaining the G to H difference in the switch. I wondered when you started what was going to happen to the sig to noise ratio. Well thanks a ton for the unique and well done videos.

@FesZElectronics

5 жыл бұрын

I'm happy you liked it! The various topologies by them selves do not have a major influence on SNR in an ideal world. The biggest impact comes in the form of TotalHarmonicDistortion. What I'm trying to say is that a poorly executed class A will have more noise than a good class D. But if you compare 2 well made Class A and D circuits with proper filtration the major difference will be the THD, since most of the noise from class D will anyway be outside of the audio spectrum.

@jp1226

3 жыл бұрын

@@FesZElectronics xxcafzxfdrd

great video, very interesting topic and well explained :D

@FesZElectronics

5 жыл бұрын

I am happy you liked it. I will try to make more videos about general electronic know-how in the future.

great video, very interesting topic and well explained :D

Best amp class video on the interwebs

subscribed very good teacher

Brilliant video!

this is very good video. thank you

Bravo! Very detailed and nice videos ! Especially the video about diy HIFI microphone 🎤... I think the spwm signal is also generated using the D amplifier scheme, any thoughts!

Excellence video, thank you very much!

@FesZElectronics

4 жыл бұрын

Thanks for watching! I'm happy you enjoyed it!

Top job! 😃

Felicitări pentru tot ce faci, urmăresc videoclipurile tale de mult timp și abia acum am realizat că ești român, sau cel puțin înveți din cărți în limba română 😅

@FesZElectronics

2 жыл бұрын

Multumesc mult! Numai bine!

Great video Thank you ❤

Siempre me gustó la Electrónica y entiendo aprender en Inglés, necesito aprender con estas herramientas modernas.

ahh , I spoke too soon,, had to speed this one up. I don't know why people keep saying slow down. Makes me wonder if they are engineers. The Harvard and Stanford open courses speak in a way I would consider normal. Diff topic >> Last year I started getting into mag amps, very fascinating stuff. It's like a forgotten technology. There is lots of room for optimization. I don't even think foil tape laminated inductors were a thing when mag amps were relevant. Really cool stuff.

@FesZElectronics

4 жыл бұрын

@Mr Sc1 I didn't know about this sort of amplifier, it has quite an interesting operating principle. Did you try to build one? I've seen that it should be built on magnetic cores with a special hysteresis curve, do you know what commercially available core type would be recommended to build one of these? or any will work just not as efficiently

@mrsc1914

4 жыл бұрын

@@FesZElectronics A good way to get started is to wind a toroid with 3 coils. One will be the input. One a control. One an output. Drive it with a normal amp and control it by clamping with passives. or Control it with yet another amp OR just attach the control wind anti-phase to the original. Many original papers speak of control with DC, but that never really was anything to brag home about. At least for me. Wouldn't shunt all the way, took a lot of current, etc... With a toroid you can shutoff everything by just putting a neodymium on it. So, I dunno why people cared that much. Except for the fact that many of these papers were trying to control current levels from generators and the same trick doesn't work on laminate. >> in a sense this whole paradigm is how old welders worked.. sorta.. you'll see

@asdfazad6643

2 жыл бұрын

Mag amps... Please what it means?

Hello, kind of basic question, for G and H, why is it necessary to switch the higher voltage, why not have it connected permanently?

Holy! I best stick to operational amplifier! Much less mathematics and much fewer components to worry! I cannot even understand half of the graph even if it is in English! Haha hahaha!

Class D is NOT digital, because the analog to pwm conversion is an analog procedure. The pulse width is NOT NECESSARILY and NOT USUALLY discreticed. So you don't have a discrete chain of Ones and Zeros. You have usually a fixed frequency (sometimes even not, like in the case of delta sigma conversion) pwm signal with a continuous variation of the duty cycle.

@FesZElectronics

2 жыл бұрын

I guess you can make a similar argument about a switch mode converter - most of the circuit is analog, except that the final response (the switch) is non-linear - it has a clear on and off; I guess a better classification would then be linear and non-linear for the amplifier classes.

Is there a way to plot THD vs frequency? Great video as always. Cheers

@FesZElectronics

4 жыл бұрын

Hello! I'm not sure how to plot this information out in a graph directly trough LTspice, but to get the raw data you can use a .step command combined with a .four command. This way you can go trough all the frequencies of interest using the step command to change the analysed frequency and get the results based on the .four command in the error log. I covered the .four command in one of my older videos on FFT: kzread.info/dash/bejne/pIp12LlqesuYcag.html ; Depending on the frequency range you wish to analyze this might take a while because of the time step needed to get good clean results for the lowest frequency.

@TheMechatronicEngineer

4 жыл бұрын

@@FesZElectronics Interesting. I'm not sure how I can extract THD values using .step command tho... Any suggestion?

@FesZElectronics

4 жыл бұрын

The idea was to run the .four command with multiple values of frequency; to run multiple simulations at different frequencies like: .step param frq list 100 1k 10k ; simply make a list of all frequencies you wish to analyze and link it to a parameter (in this case frq) .four {frq} 10 V(out) ; analyze 10 harmonics on net V(out) at frequency {frq} and also the input signal to the tested circuit - a voltage source needs to be a sine wave which is set at frequency {frq} This way all comands are running arround the test frequency, and the simulator will run multiple simlation and give THD values for each value of parameter {frq} Let me know if this works out for you.

Why do we have two vOmin values in calss A amplifiers?

whats the name of this book you teach us?

Great video, thanks! But it leaves a reasonable question - how does class C work? :)

@FesZElectronics

4 жыл бұрын

Well to be fair, I didn't just miss class C, I also missed E and F and I think there are some higher order ones. The reason why I didn't cover C was that like E and F its a type of amplifier dedicated to RF. Its not really used under other circumstances, definitely not in audio.

@R2AUK

4 жыл бұрын

@@FesZElectronics This is most unfortunate :) Personally I'm very interested in RF at the moment. Hopefully sometime in the future you could describe these types of amplifiers too! I have a bunch of books on the subject that I'm going to read in the nearest few months but your explanation with LTspice is so much better. Thanks once again.

Well , very detailed exlications , Nice. Cum fac rost de numarul tau de telefon sau cum ti'l dau pe al meu , putem discuta ceva interesant , sunt rari pe aici oamenii care acopera domeniul audio fara subiectivism. Thanks 😊

where to get ut

👍

Very cool video with examples. May I ask you for some advice about the studio monitors? Would be great to hear an answer from an expert. Which of those monitors are best for amplifiers? 1. Kali IN-8 - D-D-D - specs www.kaliaudio.com/independence#Specs-Section-Independence 2. KRK RP10-3 G4 - D-D-D - specs www.sweetwater.com/store/detail/Rokit103G4--krk-rokit-10-3-g4-10-inch-3-way-powered-studio-monitor 3. Focal trio11 - G-G-A/B - specs www.focal.com/sites/www.focal.fr/files/shared/catalog/document/trio11-be_fiche-produit.pdf 4. Genelec 8331A - D-D-D - specs www.genelec.com/8331a#section-technical-specifications Does D amp great for studio monitors? I saw only A, A/B, D, and G classes. I want clear sound from them. Thanks a lot!

Your presentations are excellent but you are too fast for one to get the in depth of all your tutorials

Your presentations are excellent but you are too fast for one to get the in depth of your tutoria

@iamwangine8752

2 жыл бұрын

Play/pause/rewind ☺️😁

I thought you were from Hungary but you read a book in Romanian

@FesZElectronics

3 жыл бұрын

Well I'm from the western part of Romania and my parents are half Hungarian so close enough.