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All right, so what you are trying to say is this, if one wants quality sound go class a or a/b, and if one wants dual ch crap go class d. ps. class d is also internally biased with a central common ground, thus no attempt should ever be made, unwittingly OR ON PURPOSE to jump (mono) both output stereo channels - (as they are NOT genuine stereo, but rather only dual mono "twin" channels) into a mono pa system, otherwise your class d outputs will instantly fry themselves internally. Hence why genuine audiophiles - prefer correctly orientated class a & class a/b amplifiers (the truly push-pull genuine "stereo" with their common-earth grounded-return 2ch STEREO outputs). Because these cannot be screwed when anyone attempts to common BOTH L+ & R+ outputs together for a single pa mono speaker - as the two outputs are able to be thus externally connected as if one instead of two channels, utilising ONLY ONE of the two "'internally-connected" common-earth grounded-return (-) negatives - of either of both channels. That - old but extremely efficient system MAY have appeared to run as a low power amplifier (compared to a similar rated class d) but only the push-pull, common-earth grounded-return amplifiers are able to be thus interconnected for either stereo 2ch or mono 1ch, without any special "bridging" switching system, PLUS will allow a totally different "style" of connection called a DELTA configuration. ie: by connecting the two NORMAL R/L outputs to the common-earth grounded-return to achieve 2ch stereo whilst SIMULTAINIOUSLY using R+ & L+ across a third speaker, to obtain the true differential DELTA MODE - HIDDEN THIRD CHANNEL, one instantly has an old school, (pre-digital) total surround sound system - utilising the full 100% "drivable output" - of the so-called low powered class a & class a/b, whilst actually running the amp output to a much higher power rating, with far less wasted energy lost internally - thereby running the amp cooler for any given spl level, that just 2ch operation outputs. Been there, done that - triple-channeled any normal 2ch stereo output (of old school amps), thereby delivering way higher spl levels, from the so-called low power of a push-pull 2ch, thus utilising 100% of their actual output power, not just the57.7% across 2ch/2speaker stereo outputs - and have proved this method, as totally efficient since 1965. However- that isn't the b-all end-all of delta connected 2ch stereo outputs, from old school analogue class a & class a/b amps by any stretch of the imagination, having tested upwards of 25.7 ch systems, using that basic DELTA system, from really cheap amps, In 2003, just for the sheer hell-of-it, I deliberately bashed together a 7.3.1 super reverb sub-sub system with 25 completely unrelated oddment impedance speakers, being speakers source from house and car systems, through to pulling speakers out of dumped tv's and even an oddball from an old valve radio, gaining (on discovery) far more power in spl from a SINGLE 300w 2ch stereo amp, than a professional sound competition competitor achieved at an organised public sound-off, who used a 2,400w 2ch amp normally (into a basic 2ch system of what eventuated as a balanced 2ch - but an unbalanced DELTA power output). So - in reality - a class d - for me, is a small puff of white smoke and a permanent "forever-after" no-go amp. See? No - I mean "see" ... th-cam.com/video/Ub0S8eTijrA/w-d-xo.html And then watch - ten lights flash and pulsate whilst being FED 2ch stereo TAPE CASSETTE PLAYED musical sound - to flash at different rates, (speeds/tempos/call-it-what-you-want) all ten little lights, being powered by the actual current (being the running sinusoidal music currents - from directly driven speaker coil circuits) which then visibly show the completely different audio analogue channels that would "normally be sent" into TEN speakers in a "decagon-o'phonic" system (instead of just driving ten filament globes to full brightness individually). re: th-cam.com/video/N64gnOa_-Aw/w-d-xo.html TEN completely different channels of surround "stereo" obtained from the two (2) NORMAL SPEAKER "raw" GENUINE common-grounded earth-return (proper-stereo) outputs, from a class AB amp You'll never get any class D dual-mono 2ch amp (a-so-called-stereo, but in reality a dual mono) with it's internally-grounded internally bridged ISOLATED "high" speaker outputs (that cannot be EXTERNALLY interconnected OR grounded "for mono-PA use, as that is electrically impossible). Now tell me which is better?
6:10 i always confused by that transistors which has more then one of Base , Collector or emitter in single symbol what it's mean can i buy such with many collector pin in single transistor ?
Im an assembler and no one i work with can answer any of these questions except the engineers ( who are always too busy). This channel is REALLY helping my grasp on circuits. thank you for taking the time to do this! Its awesome and i recommend it to everyone i work with.
As a former teacher I've got to give you props. Concise, interesting, and funny to boot. Got my vote. I'm going to enjoy learning from your channel for sure.
Hi as a student under going analog design circuit lectures i want to learn how do I calculate or more or like optimize designing a amplifier or anything related to transistors or mosfets
Your channel is an excellent source of knowledge of basic electrical engineering applications. I remembered a lot of things and their applications, and also learned a lot, what I want to embody. Currently im at 4th year in university, and my current knowledge in electrotechnics are highly different in positive way from 3th year and one of the reasons is your channel. Thank you, greetings from Russia!
I have been a hobbyist for years but never was able to understand some concepts just reading about them. Your videos really help explain and clarify things and I have been able to make some fun things because of them!! Thanks for your videos!!
Great video. I'm am old guy. Retired engineer - software and systems mostly. When the IBM PC first hit the market, it had a speaker that was gated on or off; current flowed through the voice coil (that's a clue how old I am) or it didn't. The bet was that we could get a (pretty pure) sine wave out of it. Lots of interest but few takers. What we would do was drive the speaker (way) beyond cutoff. It would act as an integrator and by varying the frequency we could get close to a sine wave. Fourier says we can operate in the time or frequency domain interchangeably. Did effectively the same as the pulse width modulation...
Joe Burks cool, so basically we can treat the internal pc speaker as a class d amplifier, but we need some software to pick wav files and convert em in pwm waves for driving the pc speaker, then wiring it to some filter and ta-da, wouldnt be too hard to make... i wonder how back then didnt sell something like this... well the SB was kickin the 90s
Well, WAV files only appeared towards the end of that era (Windows 3? I remember .VOC files being the favourite of the early Soundblaster tools before then), but I wrote some software to do high frequency PWM on that speaker back in the day!
I'm a GCSE Electronics student -well i was was, i had my final exam a few weeks ago- and i find all of your videos both really helpful with what i needed to understand but also has pretty much driven me to want to do A Level Electronics. Your video on PWM, for example made me go and make a simple PWM circuit in our workshop and it worked! So again thanks so much for these videos and keep going. They're awesome!!!!!
This is a very good explanation. I have never really understood how a Class D operates, but now it makes sense. Thank you, and keep up the brilliant work!
Wow I've not burned through this many youtube videos in quite awhile. You've got the most engaging video format that I've ever seen regarding electronics! A true purveyor of TH-cam University!
Thats the answer i was looking for..... Why not class D everywhere... You replied promptly....thak you. Your appeal to support is very genuine and I decided to support
I am an old head and was confused as to how you would use a class D amp for audio. You tutorial was great! Now I know, and it is a relativity simple circuit, if you are not designing the IC. Thanks for sharing and I subscribed.
I'm glad to see you're doing videos again, one of the few people on TH-cam that does a fantastic job at it. Best - Transformer tutorial - "last of all, remove all wire cutters from the area" brilliant!
Wow. Your channel is one of the best electronics themed ones out there. I really like that you gave explanations in the schematic regarding the purpose of the different caps. It helps me a lot to get a better understanding of the schematic. Thanks and keep it up!
By far the best lecture for young people about Class - D amps. Actually, I never got to understand this stuff completely until now :D Thanks man I will share amongst my friends!
My professors sucked in making me understand class D amplifiers. I just saw this and picked up so many things in a very short time. Thanks for the amazing video!!
Just bookmarked the Amazon link to help you get some commission!! Wish I knew about this before Christmas shopping! Videos are great! please continue to make more!
It's hard to find teachers that can organize their lesson to make sense to new people. You're doing an amazing job of it, definitely using your amazon link. And keep it up with the basics, applications, and go a little more in depth in maybe a follow up.
Everyone who uses Class D amplifiers in their cars should watch and learn. This is the best explanation I've seen for how these "distortion enhancers" boost power. Class A/B is less efficient and requires more heatsink, but they will always sound better to me and since I don't need 3000W for my subs, my 1000W Class AB amps will do just fine. Great video Afrotechmods
If you can tell the difference between Class AB and Class D in a blind comparison, I'd be damned impressed. I have Focal speakers in my car hooked to a Class D JL Audio amp, circa 2012, and I am "that guy" when it comes to changing settings and annoying people with stereo and TV setups. The class D amp (4x75 watt plus 300 for sub) sounds perfect.
@@evilspoons If you couldn't tell the difference, you need your hearing checked. Class D sounds pretty wretched through decent speakers. Kinda sounds like watching a youtube video on a low resolution due to the extra distortion in higher frequencies.
Absolute nonsense, some of the high-end studio monitor speakers are using class d amps, as a previous commenter wrote, 'it's all in the design'. There are great class d amps and terrible class ab, it's the quality of the design that affects the results.
I love watching and learning from your video's. You have the highest grade electronic tutorials on you tube maybe even the net. You explain things in a way that everybody can understand and even a little humorous at times. Would love to see more videos.
I know lot about electronics, and part of my daily job is electronics, bat Your explanations are just great, and in couple days i watched almost all Your videos! just for fun
Encouraging comment: Great job! I very much enjoy the rush of new synapses forming while watching your vids. Keep up the good work! You are making this universe a much better place.
The best tutorial I seen in some time. Well one of the best(Otherwise it's just simply neglecting other TH-camr's contribution.) But still better than the most. A big thumbs up. Keep up the good work.
thanks for these videos. Has helped me a lot to understand basic electronics and other useful component functions such as this class-D amp. Being in a very semiconductor oriented team with not enough knowledge (even if you are in the business side) is very frustrating. you sir have helped me cope with that limitation and learn more every day I click on one of your videos. Cheers!
Thanks! I'm taking an electronics course at university but it's totally useless when trying to actually make something. I'm trying to make a bass amp right now and actually understand the course material at the same time, so your video was really helpful!
Another fantastic tutorial. Been following your stuff for years and have never stopped loving them! Miss when you had more humor in them (like your transformer tutorial), but I get it, these are educational, not off the wall random stuff. Keep being awesome!
I loved the part about 'calculating amplifier efficiency is beyond the scope of this tutorial' -- much more accurate than 'requires a bunch of math and will probably start a flame war,' A great tutorial.
Its awesome to see you are making videos again. I remember learning most of what I know about electronics from your older videos! Keep making these, they are great!
Thanks so much for this video. Probably one of the most succinct explanations of Class D amps I've seen. And really all your explanations are to the point and quite good!
Nice to see you're back in action! Saw a buttload of your vids about a year ago and didn't subscribe cause I thought you quit, happy seeing you on, subscribed! :)
As an electrical and comp engineering student, this video made me quite happy to watch, learning about all this! xD I can't wait to check out what other content you have
Afrotech, you just are on time with this video! I have a couple of speakers lying around which i want to use for my guitar. I needed a video of how to amplify and I've got one. Maybe the next video might be: how to control stepper motors for making your own 2D painters/cutter/printers. Or how to protect your electronics (how not to fry your raspberry pi or arduino) Thanks for the Video!
VERY NICE VIDEO AND THE BEST EXPLANATION I'VE EVER SEEN ABOUT THIS SUBJECT, I'M A AUDIO ENTHUSIAST AND WOULD LOVE TO SEE A TUTORIAL ON HOW TO DESIGN A CLASS A AMPLIFIER WITH YOUR GREAT DETALISTIC APROACH TELLING HOW, WHAT AND WHY ALL THOSE ELECTRONICS NEED TO BE THERE. GREAT JOB!
Great video mate, one of the best tutorials I have seen on youTube. Well explained for everyone and no useless information. Thanks for putting this up.
This video is a great refresher tutorial. The last time I studied amplifiers was 20 years ago. Personally I prefer the sound from a class A mono amplifier. :)
I thought you will never make videos again. I really like your content, you helped me so much to understand electronics, please keep this up. You are awesome!
Man, you have an excellent way of describing these electronic topics. It is a shame you cant get $1.00 per hit; you would be swimming in cash. This Class-D amp video was GREAT. I loved the vodka bottle reference. Educational, funny -- I love it. Thanks.
I really like your videos! Even your voice (which is a great "radio voice") reminds me of my high school science teacher who was also my electronics "Elmer" helping me get my amateur radio license (back when tubes dominated.)
I ordered something on Amazon last yer, and if I would have known that then, I would have done that to give you the money. My bad, but keep up the good work, these videos have really helped me.
Great tutorial - very efficiently used 8:28, straight to the point. I got to recommend this one to my colleagues - they do know how to program control software for audio hardware but they don't know how amplifiers work, especially class-D ones. ;o)
Excellent tutorial! The video of the oscilloscope depicting the output should be illuminating for many people. As a musician, electronics expert and audiophile, I absolutely HATE this "class D" abomination; however, where power consumption is critical, it works well. This is also very much how a sine-wave inverter works. The differences being in scale and only 1 frequency - 60Hz. For the best sound quality, a Class-A amplifier is best. The output is working through 360 degrees of the cycle. Class AB is typically around 270 degrees so it saves a bit of power - this is most suitable for high-power RF applications such as linear amplifiers which are tuned to 1 frequency where the "missing" part of the conduction is handled by the flywheel effect of a tank circuit. I would encourage the "younger players" to build the circuit in this tutorial and experiment with different values of inductance and capacitance in the output filter to examine what effect they have on the quality of the final output signal.
Thanks for the video. I'm taking an introductory electrical engineering class and we're studying amplifiers at the moment. I'm rather bothered by the fact that in class we're studying the diagrams and never being informed what the true reasons behind the chosen design of the circuit. This video has shed a bit of perspective!
This is some good quality premium content ! I appreciate you for sharing it with us ! I'm gonna build one of my own these days.. oh wait, I forgot I'm poor and can't afford it ! =)
Every time I hear your voice I see a guy in a clean white pilot's shirt with side parted hair and a moustache a la Bestie Boys 'Sabotage'! :o) Great video, very cleanly put together. You should work for NASA's publicity dept.
Great video. I am thinking of building my own amp and power supply for my self made speakers. But I guess I will stick to some pre build or DIY kits. I am really glad tho, I understand now how an amp works. Please, keep up making such videos.
Loved your video! The part about musicians avoiding Class D is inaccurate though. Most high quality bass amps have at least a Class D power section, Dark Glass stuff and others alike. Small head, 900W of power, can only be achieved by Class D at that size and sounds amazing!
Afrotechmods Damn, I am gonna build this! I got 2 80W pioneer speakers that need a amp. I got some decent power MOSFETs as well. This is gonna be so epic, thanks for the tutorial.
Good video! Once I get some money together I plan to get some stuff from your Amazon shop. Lots of good stuff I've needed for a long time. Even better is the fact that it helps you out.
I love your show. I am just learning electronics in college. This is so fun I sit and watch your explanations just for fun sometimes! What about gear? Maybe if you put some cool shirts in your Amazon store I could buy them, stuff like Dave wears at EEVlog - an opamp circuit that says "I only give negative feedback" for example. Spend some time finding cool shirts and I promise to buy them from your store! Thanks
im new for u beutiful chanel..the first video I see to u chanel its for regulator. .the way of of explaining its the best ..and that what I like ..Thank you and I wish to u more success
Well you said you read every comment so here we go. When creating tutorials like these it is hard to decide when to go a bit deep but not too deep. More important when to declare something is complicated and you should see at as black box for not. Which you did very well. I shared your page in my Facebook to gather more audience. I have a suggestion: Please provide a road map of the videos you like to make in your website and try to raise money for each like a kick starter. So there will be 30 videos in entry level which cover all basic thing and you have made some of them. But you need money to make the others. This goes on for other levels. So people see what they are missing :-)
@@Afrotechmods Just put some placeholders for videos with their description in the website in the middle of already-there videos and money will flow... (and if not, that won't be your loss at least)
There's lots of hi-end class D amps these days, with very low THD values (in the 0.005% range) so I'm not sure I agree on your closing comments :-) A few examples: B&O's latest ICEpower modules: www.icepower.bang-olufsen.com/en/solutions/speaker/ASX_SERIES Hypex nCore modules: www.hypex.nl/product/2012-11-23-13-41-35/nc400.html End user products: Wyred4Sound mAmp: wyred4sound.com/products/power-amps/mono/mamp Belcanto REF1000M: www.belcantodesign.com/Belcanto_REF1000M_Amplifier.html Merrill Audio Veritas: www.merrillaudio.net/veritas.html
What about making a tutorial about 3-way crossovers i'd like to built one for my car. I searched it in the internet and i saw that there are only a few component necessary, capacitor, inductor, resistor and above-average soldering skill. and good to see you back!
Oscilloscopes use electrostatic deflection. Tvs use magnetic defl. and althougb you could deflect independantly the verticall, horizontal defl. is also the drive for the high voltage transformer. So it would be rather involved to have a horz. circuit just for the benefit of the flyback transformer derived voltages: HV, screen, focus and filament. Then, having the needs met of the picture tube, one could deflect the beam. The horizontal would be a sawtooth, and vertical the input. Refinements would be blanking to extinguish the spot during return right to left, and a beam limiter to prevent burning a line or spot into the phosphor at slow or no deflection. I saw one in high school electricity shop, but it may have been limited to 60 hz ac demonstrations, but was awesome, a bright 22 inch SCOPE!
Fantastic video. Newer knew that class D amps was functionally what I was doing in software when I was programming an 8 bit sound driver on a 1 bit port in the early 90'. The switching frequency was only 16 Khz.
iEugene1994 Yes I'm quite new myself to MCU been playing with an arduino past couple of months. I've seen that AVR class D amplifier wanting to build one myself.
Class D is used in some very highend speakers! Take a look at the LS1 of grimm audio (with hypex ncore amps) and also some B & W amps. The key is in the feedback circuit.
Interested in learning about wireless power? Subscribers can get up to 80% off my course Wireless Power to the People - Wireless Charging 101 on udemy using the coupon code "TH-cam" www.udemy.com/wireless-power-to-the-people-wireless-charging-101/?couponCode=TH-cam
excuse me sir, do you now the THD of the amplifier at 12v with 4ohm speaker?
All right, so what you are trying to say is this, if one wants quality sound go class a or a/b, and if one wants dual ch crap go class d.
ps.
class d is also internally biased with a central common ground, thus no attempt should ever be made, unwittingly OR ON PURPOSE to jump (mono) both output stereo channels - (as they are NOT genuine stereo, but rather only dual mono "twin" channels) into a mono pa system, otherwise your class d outputs will instantly fry themselves internally.
Hence why genuine audiophiles - prefer correctly orientated class a & class a/b amplifiers (the truly push-pull genuine "stereo" with their common-earth grounded-return 2ch STEREO outputs).
Because these cannot be screwed when anyone attempts to common BOTH L+ & R+ outputs together for a single pa mono speaker - as the two outputs are able to be thus externally connected as if one instead of two channels, utilising ONLY ONE of the two "'internally-connected" common-earth grounded-return (-) negatives - of either of both channels.
That - old but extremely efficient system MAY have appeared to run as a low power amplifier (compared to a similar rated class d) but only the push-pull, common-earth grounded-return amplifiers are able to be thus interconnected for either stereo 2ch or mono 1ch, without any special "bridging" switching system, PLUS will allow a totally different "style" of connection called a DELTA configuration.
ie: by connecting the two NORMAL R/L outputs to the common-earth grounded-return to achieve 2ch stereo whilst SIMULTAINIOUSLY using R+ & L+ across a third speaker, to obtain the true differential DELTA MODE - HIDDEN THIRD CHANNEL, one instantly has an old school, (pre-digital) total surround sound system - utilising the full 100% "drivable output" - of the so-called low powered class a & class a/b, whilst actually running the amp output to a much higher power rating, with far less wasted energy lost internally - thereby running the amp cooler for any given spl level, that just 2ch operation outputs.
Been there, done that - triple-channeled any normal 2ch stereo output (of old school amps), thereby delivering way higher spl levels, from the so-called low power of a push-pull 2ch, thus utilising 100% of their actual output power, not just the57.7% across 2ch/2speaker stereo outputs - and have proved this method, as totally efficient since 1965.
However- that isn't the b-all end-all of delta connected 2ch stereo outputs, from old school analogue class a & class a/b amps by any stretch of the imagination, having tested upwards of 25.7 ch systems, using that basic DELTA system, from really cheap amps,
In 2003, just for the sheer hell-of-it, I deliberately bashed together a 7.3.1 super reverb sub-sub system with 25 completely unrelated oddment impedance speakers, being speakers source from house and car systems, through to pulling speakers out of dumped tv's and even an oddball from an old valve radio, gaining (on discovery) far more power in spl from a SINGLE 300w 2ch stereo amp, than a professional sound competition competitor achieved at an organised public sound-off, who used a 2,400w 2ch amp normally (into a basic 2ch system of what eventuated as a balanced 2ch - but an unbalanced DELTA power output).
So - in reality - a class d - for me, is a small puff of white smoke and a permanent "forever-after" no-go amp.
See?
No - I mean "see" ...
th-cam.com/video/Ub0S8eTijrA/w-d-xo.html
And then watch - ten lights flash and pulsate whilst being FED 2ch stereo TAPE CASSETTE PLAYED musical sound - to flash at different rates, (speeds/tempos/call-it-what-you-want) all ten little lights, being powered by the actual current (being the running sinusoidal music currents - from directly driven speaker coil circuits) which then visibly show the completely different audio analogue channels that would "normally be sent" into TEN speakers in a "decagon-o'phonic" system (instead of just driving ten filament globes to full brightness individually).
re:
th-cam.com/video/N64gnOa_-Aw/w-d-xo.html
TEN completely different channels of surround "stereo" obtained from the two (2) NORMAL SPEAKER "raw" GENUINE common-grounded earth-return (proper-stereo) outputs, from a class AB amp
You'll never get any class D dual-mono 2ch amp (a-so-called-stereo, but in reality a dual mono) with it's internally-grounded internally bridged ISOLATED "high" speaker outputs (that cannot be EXTERNALLY interconnected OR grounded "for mono-PA use, as that is electrically impossible).
Now tell me which is better?
@@quixkiwi5337 damn, that' s long!
Yes!
6:10 i always confused by that transistors which has more then one of Base , Collector or emitter in single symbol what it's mean can i buy such with many collector pin in single transistor ?
Nicely explained. Great humour. Stay awesome!
Great name!
Afro and gr8 scott rule :)
Ok so... when are you doing like a really cool video together? Man that would be so epic!
Hey great scott ..... I am a subscriber of your channel. Your videos are great.
@@onlyvinod56 I m also
You are a gateway to electronics for young people.
Nukes Away I agree.
Wil Badillo I'm not young myself but he makes it interesting enough for kids to understand.
Im an assembler and no one i work with can answer any of these questions except the engineers ( who are always too busy). This channel is REALLY helping my grasp on circuits. thank you for taking the time to do this! Its awesome and i recommend it to everyone i work with.
As a former teacher I've got to give you props. Concise, interesting, and funny to boot. Got my vote. I'm going to enjoy learning from your channel for sure.
Hi as a student under going analog design circuit lectures i want to learn how do I calculate or more or like optimize designing a amplifier or anything related to transistors or mosfets
Your channel is an excellent source of knowledge of basic electrical engineering applications. I remembered a lot of things and their applications, and also learned a lot, what I want to embody. Currently im at 4th year in university, and my current knowledge in electrotechnics are highly different in positive way from 3th year and one of the reasons is your channel. Thank you, greetings from Russia!
I have been a hobbyist for years but never was able to understand some concepts just reading about them. Your videos really help explain and clarify things and I have been able to make some fun things because of them!! Thanks for your videos!!
I think the fact that you read all of you comments is awesome!
+AG Electronics Thanks!
Great video. I'm am old guy. Retired engineer - software and systems mostly. When the IBM PC first hit the market, it had a speaker that was gated on or off; current flowed through the voice coil (that's a clue how old I am) or it didn't. The bet was that we could get a (pretty pure) sine wave out of it. Lots of interest but few takers. What we would do was drive the speaker (way) beyond cutoff. It would act as an integrator and by varying the frequency we could get close to a sine wave. Fourier says we can operate in the time or frequency domain interchangeably. Did effectively the same as the pulse width modulation...
that speaker must've suffered great deal of dc current!
Joe Burks I love gritty old engineering stories like these...
I have no idea of what you guys are saying. But I like it!! This is very interesting
Joe Burks cool, so basically we can treat the internal pc speaker as a class d amplifier, but we need some software to pick wav files and convert em in pwm waves for driving the pc speaker, then wiring it to some filter and ta-da, wouldnt be too hard to make... i wonder how back then didnt sell something like this... well the SB was kickin the 90s
Well, WAV files only appeared towards the end of that era (Windows 3? I remember .VOC files being the favourite of the early Soundblaster tools before then), but I wrote some software to do high frequency PWM on that speaker back in the day!
i love how you are honest about that amazon link, rather than "suggesting" something, like so many youtubers do with audible.
Since *everyone* is doing that with Audible, I'd say it's part of the contract. Amazon affiliate link is an entirely different beast.
I'm a GCSE Electronics student -well i was was, i had my final exam a few weeks ago- and i find all of your videos both really helpful with what i needed to understand but also has pretty much driven me to want to do A Level Electronics. Your video on PWM, for example made me go and make a simple PWM circuit in our workshop and it worked! So again thanks so much for these videos and keep going. They're awesome!!!!!
sorry for the crossed through bit dude i didnt know i did that.
This is a very good explanation. I have never really understood how a Class D operates, but now it makes sense. Thank you, and keep up the brilliant work!
Wow I've not burned through this many youtube videos in quite awhile. You've got the most engaging video format that I've ever seen regarding electronics! A true purveyor of TH-cam University!
Well done. Good script. Clear voice. Fine pronounciation. To the point. And funny.
Thats the answer i was looking for..... Why not class D everywhere... You replied promptly....thak you. Your appeal to support is very genuine and I decided to support
Love your stuff, man. I'm an Electrical Engineering student and this is giving me a lot of encouragement to survive my classes. Keep it up!
I am an old head and was confused as to how you would use a class D amp for audio. You tutorial was great! Now I know, and it is a relativity simple circuit, if you are not designing the IC. Thanks for sharing and I subscribed.
I'm glad to see you're doing videos again, one of the few people on TH-cam that does a fantastic job at it. Best - Transformer tutorial - "last of all, remove all wire cutters from the area" brilliant!
I read a paper on a scientific magazine about this for 2 days along but this video speeds up my understanding like a rocket !! many thanks !
Wow. Your channel is one of the best electronics themed ones out there. I really like that you gave explanations in the schematic regarding the purpose of the different caps. It helps me a lot to get a better understanding of the schematic. Thanks and keep it up!
By far the best lecture for young people about Class - D amps. Actually, I never got to understand this stuff completely until now :D Thanks man I will share amongst my friends!
My professors sucked in making me understand class D amplifiers. I just saw this and picked up so many things in a very short time. Thanks for the amazing video!!
Unfortunately i cant spend money on things like this right now, but you are simply amazing, your videos are just pure genius, thank you!
Just bookmarked the Amazon link to help you get some commission!! Wish I knew about this before Christmas shopping!
Videos are great! please continue to make more!
Thank you!
It's hard to find teachers that can organize their lesson to make sense to new people. You're doing an amazing job of it, definitely using your amazon link. And keep it up with the basics, applications, and go a little more in depth in maybe a follow up.
I learn more from you in five minutes, than I can from reading half a book.
Excellent, keep up the good work.
Everyone who uses Class D amplifiers in their cars should watch and learn. This is the best explanation I've seen for how these "distortion enhancers" boost power. Class A/B is less efficient and requires more heatsink, but they will always sound better to me and since I don't need 3000W for my subs, my 1000W Class AB amps will do just fine. Great video Afrotechmods
If you can tell the difference between Class AB and Class D in a blind comparison, I'd be damned impressed. I have Focal speakers in my car hooked to a Class D JL Audio amp, circa 2012, and I am "that guy" when it comes to changing settings and annoying people with stereo and TV setups. The class D amp (4x75 watt plus 300 for sub) sounds perfect.
@@evilspoons If you couldn't tell the difference, you need your hearing checked. Class D sounds pretty wretched through decent speakers. Kinda sounds like watching a youtube video on a low resolution due to the extra distortion in higher frequencies.
Absolute nonsense, some of the high-end studio monitor speakers are using class d amps, as a previous commenter wrote, 'it's all in the design'. There are great class d amps and terrible class ab, it's the quality of the design that affects the results.
@@jtsotherone
With adaptable filters
I love watching and learning from your video's. You have the highest grade electronic tutorials on you tube maybe even the net. You explain things in a way that everybody can understand and even a little humorous at times. Would love to see more videos.
I know lot about electronics, and part of my daily job is electronics, bat Your explanations are just great, and in couple days i watched almost all Your videos! just for fun
I am so glad you're back! You and Dave Jones make the best videos about electronics!
Encouraging comment: Great job! I very much enjoy the rush of new synapses forming while watching your vids. Keep up the good work! You are making this universe a much better place.
The best tutorial I seen in some time. Well one of the best(Otherwise it's just simply neglecting other TH-camr's contribution.) But still better than the most. A big thumbs up. Keep up the good work.
This is the type of video that motivates me to keep studying electronic engineering. Thank you !
Do it, homework never stops throughout your life unless you give up and let others think for you.
thanks for these videos. Has helped me a lot to understand basic electronics and other useful component functions such as this class-D amp. Being in a very semiconductor oriented team with not enough knowledge (even if you are in the business side) is very frustrating. you sir have helped me cope with that limitation and learn more every day I click on one of your videos. Cheers!
I have no idea how and why I haven't seen this channel yet. 2 videos was all it took to convince me to sub.
I dont even know what any of that means but your videos are so cool i listen to them anyway!
Cant wait to build it soon.
Of everyone I follow, these are the only videos that I get REALLY excited about. LOVE your videos!!
Thanks! I'm taking an electronics course at university but it's totally useless when trying to actually make something. I'm trying to make a bass amp right now and actually understand the course material at the same time, so your video was really helpful!
not buying things on Amazon so i leave some encouraging words here. Thanks and keep up the good job!
Another fantastic tutorial. Been following your stuff for years and have never stopped loving them!
Miss when you had more humor in them (like your transformer tutorial), but I get it, these are educational, not off the wall random stuff.
Keep being awesome!
Yours are some of my favorite electronics videos on the TH-cams. Informative with a side of humor. Thanks for all you do brother.
Explained better than every text I've ever read on the subject!
I loved the part about 'calculating amplifier efficiency is beyond the scope of this tutorial' -- much more accurate than 'requires a bunch of math and will probably start a flame war,' A great tutorial.
Its awesome to see you are making videos again. I remember learning most of what I know about electronics from your older videos! Keep making these, they are great!
Thanks so much for this video. Probably one of the most succinct explanations of Class D amps I've seen. And really all your explanations are to the point and quite good!
Nice to see you're back in action!
Saw a buttload of your vids about a year ago and didn't subscribe cause I thought you quit, happy seeing you on, subscribed! :)
As an electrical and comp engineering student, this video made me quite happy to watch, learning about all this! xD I can't wait to check out what other content you have
Afrotech, you just are on time with this video!
I have a couple of speakers lying around which i want to use for my guitar.
I needed a video of how to amplify and I've got one.
Maybe the next video might be: how to control stepper motors for making your own 2D painters/cutter/printers. Or how to protect your electronics (how not to fry your raspberry pi or arduino)
Thanks for the Video!
Thank you for adding subtitles. Sadly very few TH-camrs do this.
You are welcome. I am trying to reach people in India etc. whose first language may not be English, and TH-cam's autotranslate feature is quite good.
Hey man,Thanks I live in India,but don't underestimate me,xD
+Afrotechmods Isn't English an official language in India?
Thanks man! Your videos make all these electronics concepts so easy to understand. Very helpful to a young novice like me
VERY NICE VIDEO AND THE BEST EXPLANATION I'VE EVER SEEN ABOUT THIS SUBJECT, I'M A AUDIO ENTHUSIAST AND WOULD LOVE TO SEE A TUTORIAL ON HOW TO DESIGN A CLASS A AMPLIFIER WITH YOUR GREAT DETALISTIC APROACH TELLING HOW, WHAT AND WHY ALL THOSE ELECTRONICS NEED TO BE THERE. GREAT JOB!
I think I could listen to you explain stuff I know nothing about, all day long. Maybe some day I will even understand some of it if I'm lucky.
Great video mate, one of the best tutorials I have seen on youTube. Well explained for everyone and no useless information. Thanks for putting this up.
Damn it is nice to see you come back after 2 years.
Your videos are epic.
This video is a great refresher tutorial. The last time I studied amplifiers was 20 years ago. Personally I prefer the sound from a class A mono amplifier. :)
It's great to have you back these past couple of months! Keep it coming!
I thought you will never make videos again. I really like your content, you helped me so much to understand electronics, please keep this up. You are awesome!
your back !!! great work brotha ...... your old vids gave me a new job I love .
Woah, seriously?
This is worth the watch
Good explanation of a Class D amplifier one of the best if you have any questions hit me up
Love your videos, so much easier to understand than a stuffy professor in a lecture.
It is very nice to have you back :D
Man, you have an excellent way of describing these electronic topics. It is a shame you cant get $1.00 per hit; you would be swimming in cash. This Class-D amp video was GREAT. I loved the vodka bottle reference. Educational, funny -- I love it. Thanks.
I really like your videos! Even your voice (which is a great "radio voice") reminds me of my high school science teacher who was also my electronics "Elmer" helping me get my amateur radio license (back when tubes dominated.)
V simple way to explain Class D amplifiers. Have gone through the video multiple times.. Thanks a lot for sharing the video..
I ordered something on Amazon last yer, and if I would have known that then, I would have done that to give you the money. My bad, but keep up the good work, these videos have really helped me.
Great tutorial - very efficiently used 8:28, straight to the point. I got to recommend this one to my colleagues - they do know how to program control software for audio hardware but they don't know how amplifiers work, especially class-D ones. ;o)
Very professional and informative. You have a good voice for this type work. Liked it very much.
Welcome back Afroman! We missed you!
Excellent tutorial! The video of the oscilloscope depicting the output should be illuminating for many people. As a musician, electronics expert and audiophile, I absolutely HATE this "class D" abomination; however, where power consumption is critical, it works well. This is also very much how a sine-wave inverter works. The differences being in scale and only 1 frequency - 60Hz.
For the best sound quality, a Class-A amplifier is best. The output is working through 360 degrees of the cycle. Class AB is typically around 270 degrees so it saves a bit of power - this is most suitable for high-power RF applications such as linear amplifiers which are tuned to 1 frequency where the "missing" part of the conduction is handled by the flywheel effect of a tank circuit.
I would encourage the "younger players" to build the circuit in this tutorial and experiment with different values of inductance and capacitance in the output filter to examine what effect they have on the quality of the final output signal.
Aw mann, i searched day and night for a good tutorial, thank you so much
Thanks for the video. I'm taking an introductory electrical engineering class and we're studying amplifiers at the moment. I'm rather bothered by the fact that in class we're studying the diagrams and never being informed what the true reasons behind the chosen design of the circuit.
This video has shed a bit of perspective!
This is some good quality premium content ! I appreciate you for sharing it with us ! I'm gonna build one of my own these days.. oh wait, I forgot I'm poor and can't afford it ! =)
Every time I hear your voice I see a guy in a clean white pilot's shirt with side parted hair and a moustache a la Bestie Boys 'Sabotage'! :o)
Great video, very cleanly put together. You should work for NASA's publicity dept.
You are an excellent teacher. I'm so glad to see you making videos again!
Great video. I am thinking of building my own amp and power supply for my self made speakers. But I guess I will stick to some pre build or DIY kits. I am really glad tho, I understand now how an amp works. Please, keep up making such videos.
This is awesome I think I'll use one in my DIY car speaker system: Phone jack -> Amp -> Speakers. thanks for the vids they're amazing!
You have the best explanations. Keep up the fantastic work geezer!!
i built it and love it thanks afro keep up the good work
juniornowack pwi Yay! It verks!
Afrotechmods i know right
Afrotechmods Vee need more powah!
Great video. I need to bump the current output of a function generator and this video cleared up everything that was muddy in my text books. Thanks!
Loved your video! The part about musicians avoiding Class D is inaccurate though. Most high quality bass amps have at least a Class D power section, Dark Glass stuff and others alike. Small head, 900W of power, can only be achieved by Class D at that size and sounds amazing!
Afrotechmods
Damn, I am gonna build this! I got 2 80W pioneer speakers that need a amp. I got some decent power MOSFETs as well. This is gonna be so epic, thanks for the tutorial.
Good video! Once I get some money together I plan to get some stuff from your Amazon shop. Lots of good stuff I've needed for a long time. Even better is the fact that it helps you out.
I love your show. I am just learning electronics in college. This is so fun I sit and watch your explanations just for fun sometimes!
What about gear? Maybe if you put some cool shirts in your Amazon store I could buy them, stuff like Dave wears at EEVlog - an opamp circuit that says "I only give negative feedback" for example.
Spend some time finding cool shirts and I promise to buy them from your store!
Thanks
Thank you!! I'm going to watch this over and over until I understand, also study the rest of your materials, great stuff!
I love the style of your videos. Less "I'm the Wizard in the Ivory Tower!!111" type junk and more "Let's just get shit done already" attitude.
I was rejected from Hogwarts :(
Aka MIT
Yay for trance music!! I was a bit disappointed that there wasn't any explosion in this video, but the tutorial is great!
I wanna show this to my circuits teacher, he was trying to explain this to class. Nice simplifying.
im new for u beutiful chanel..the first video I see to u chanel its for regulator. .the way of of explaining its the best ..and that what I like ..Thank you and I wish to u more success
Well you said you read every comment so here we go. When creating tutorials like these it is hard to decide when to go a bit deep but not too deep. More important when to declare something is complicated and you should see at as black box for not. Which you did very well. I shared your page in my Facebook to gather more audience. I have a suggestion: Please provide a road map of the videos you like to make in your website and try to raise money for each like a kick starter. So there will be 30 videos in entry level which cover all basic thing and you have made some of them. But you need money to make the others. This goes on for other levels. So people see what they are missing :-)
Thank you. I tried Patreon a few years ago and most people were not interested.
@@Afrotechmods Just put some placeholders for videos with their description in the website in the middle of already-there videos and money will flow... (and if not, that won't be your loss at least)
There's lots of hi-end class D amps these days, with very low THD values (in the 0.005% range) so I'm not sure I agree on your closing comments :-) A few examples:
B&O's latest ICEpower modules: www.icepower.bang-olufsen.com/en/solutions/speaker/ASX_SERIES
Hypex nCore modules: www.hypex.nl/product/2012-11-23-13-41-35/nc400.html
End user products:
Wyred4Sound mAmp: wyred4sound.com/products/power-amps/mono/mamp
Belcanto REF1000M: www.belcantodesign.com/Belcanto_REF1000M_Amplifier.html
Merrill Audio Veritas: www.merrillaudio.net/veritas.html
What about making a tutorial about 3-way crossovers i'd like to built one for my car. I searched it in the internet and i saw that there are only a few component necessary, capacitor, inductor, resistor and above-average soldering skill. and good to see you back!
Very happy that you are back!
Will you ever make a video about Vacuum Tubes, and another one about building a Oscilloscope out of an old CRT TV?
tomoya97 That would be cool
Why? Tubes are garbage.
Oscilloscopes use electrostatic deflection. Tvs use magnetic defl. and althougb you could deflect independantly the verticall, horizontal defl. is also the drive for the high voltage transformer. So it would be rather involved to have a horz. circuit just for the benefit of the flyback transformer derived voltages: HV, screen, focus and filament. Then, having the needs met of the picture tube, one could deflect the beam. The horizontal would be a sawtooth, and vertical the input. Refinements would be blanking to extinguish the spot during return right to left, and a beam limiter to prevent burning a line or spot into the phosphor at slow or no deflection. I saw one in high school electricity shop, but it may have been limited to 60 hz ac demonstrations, but was awesome, a bright 22 inch SCOPE!
@@DarkMatterX1 Are you high?
Fantastic video. Newer knew that class D amps was functionally what I was doing in software when I was programming an 8 bit sound driver on a 1 bit port in the early 90'. The switching frequency was only 16 Khz.
You should make videos more often because i learn alot in each individual video, keep up the good work
Finally! Great Tutorial, I tried this with a 555 timer once, it worked but was not very efficient because I didn't have the filtering on the output.
iEugene1994 You can always use over sampling makes it much faster.
iEugene1994 Yes I'm quite new myself to MCU been playing with an arduino past couple of months. I've seen that AVR class D amplifier wanting to build one myself.
Output filtering makes a class D amp more "efficient"?
Clear minded and simple explanations, also enough theory...
Thanks man!
Probably the best explanation on youtube that I've seen! Great tutorial!
Class D is used in some very highend speakers! Take a look at the LS1 of grimm audio (with hypex ncore amps) and also some B & W amps. The key is in the feedback circuit.
Excellent!!! Nice to see you back!!