This video is a couple years old hence my comment is long after the video was posted. This was a great primer to familiarize a technician that never worked on switching supplies. I could have used this information about 40 years ago when first introduced to testing and troubleshooting switching supplies. The aerospace company I was working for designed many multi voltage switchers for use in aircraft where weight and size are at a premium. The technology was quite new at the time and my training was limited to linear supplies. When it was shown how much power these compact and lightweight supplies could produce I was very impressed. The multi voltage computer power supplies so common now are a prime example of this technology. Thank you again for another entertaining and enlightening video.

It means a lot to me, and probably everyone else watching this video, that you took time out of your life to explain all of this so well and go into some of the more confusing details. Thank you!

SMPS: Very clear and Professional explanation with practical and theory.Typically excellent video!

In all the years I've watched KZfaq videos, yours has to be one of the very best I've seen. Thank you, was a huge help!

Brother. Your video is one of the best I have watched on the topic. And English is your 2nd language ! Thank you !

Congratulations TRX Bench. It was one of the most amazing explanations about SMPS that I've seen. So detailed and rich of tests using scopes, multimeters and so on. Thanks for this.

never imagined such a comprehensive tutorial, so clear, and very basic to understand. you will produce more talented technicians , thank you so much. regards.

ShOcK & AWE clarity. A lesson that will, I'm sure, will be taught 500 years from now. p.s. That 1K 5 Watt resistor seems strangely out of place in a "efficient power supply". But I use to believe that the Electron was a super hero from the 50's. Thank you for the video. You RoCk!

This is an excellent video. I’m an EE brought up with linear power supplies. Never really understood how a switching supply worked. I do now! Sincere thanks. John G. Hollis, NH, USA

One of the BEST way to make even layman to understand. Hats - off. I really enjoy your pronunciation of each word with a tinge German accent. Vielen Danke. Auf wiedersehen.

View in 1.5 speed for a better voice over. Thanks.

A special thank you Peter for all your videos and all the time spent in doing them. I have expertise in software for 30 years but normally don't get to experience electronics and in the good video representation you can do it in. I want to let you and everyone know that you have made a difference in my understandings and on a business perspective a more dangerous competitor. (Not against you of course).Peter you will see a similar message to Paul but I am glad to present you two are the Best of the Best.('Besten der besten')

I subscribed after watching this outstanding explanation. It's intensely helpful that you used the right testing equipment at the right moment for demonstration. I hope to see more tutorial videos specifically on SMPS repair. Power supply repair never gets boring because they're still heavily used in their basic fashion. Other kinds of electronics is going through an endless revolution that's impossible keep up with. Thank you for this informative video. Hope to see more...

All my mystery of smps operation cleared after watching this videos. Many Thanks Sir!

the most clear and detailed explanation i saw in youtube untill now. Well done. Thank you for your offer!

Thank you Professor. I am an aero structures engineer. Highly appreciate your effort and teaching a novice like me.

Excellent video tutorial. Nothing beats seeing live traces on a scope and meter readings. I've been debugging the power supply on my TV and that section of the circuit was baffling me until I came across your video. With the knowledge gained from your video, I was able to trace the problem to a faulty regulator on the secondary side that was driving the feeedback pin high on the switch IC, thus disabling it. It all makes perfect sense now. Thanks and keep up the great work!

Switching Power Supplies with Simplified Understanding of its working principal in theory supported with practical demonstration. Great video for hobbyist and seasoned home-brewers as well as for anyone interested in an electronic engineering.

i really liked the way you walk us thru the power supply showing us the wave forms and diagrams. you are an excellent teacher. thank you very much.

If you do work with weak signal RF with any kind of A to D sampling, you'll want one of those "old school" linear power supplies to eliminate the hefty RF noise generated by most switching power supplies!!

Nice lesson on the basics of the SMPS's, Peter. Even though I've been learning about them a few years, I still enjoy watching you explain about them. And thanks for mentioning the grounding issues to help keep people that are newer to electronics from blowing their scopes, or worse.

G'day Peter, when you were talking about the U802 cnx82a Optocoupler and the way you explained it. Well done, seeing your Engish is your second language. The last part about the common mode filter this is a real part of QRM on our ham channels. Thank you Peter for sharing these moments with you. God bless you and your family.

Einfach clever! Best professional explanation, full of competence special the way you try to share your valuable professional knowledge and long years experience is clear to understand. Keep doing it. You are wished the best too.

thank you very much for teaching us with the scope patterns and diagrams the way you delivered this video clearly shows us better than most other videos i have seen. thank you very much for taking the time to make this video. you are a great teacher.

How did so much of the world end up using 50Hz and the US uses 60Hz? Great video, thank you very much. This was quite a pleasure, and shows an amazing improvement in power supplies.

Excellent video Sir! You have covered every single question I had about SMPS, very well presented, scope shots really helped. Vielen dank!

I've really enjoyed this tutorial, I am not scared so much anymore of switched mode PSUs! Thanks for taking the time to prepare this video. 73, Kostas

Thanks for a very professional and understandable explanation of Switching power supplies. Look forward to viewing your other video's. Well done.

Great SMPS video Peter!

this channel is a real treasure Thnk you for your great presentation

One of the greatest video i have watched in my life ....it has clarified everything .....couldnt understand until i saw this video....thank you very much

Thank you so very much for making this video, I've been trying to get to grips with SMPS for some time, I have seen other videos on you tube, but this is easily the best. And you explained it in quite a lot of detail, getting all this technical information across and at the same time translating it into English without so much as a mistake, Sir I salute you , You have done an excellent job !!! Ray H. ( from the U.K. )

Thank you for sacrificing your precious time and resources just to share your valuable knowledge.

One of the very great videos I have seen about SMPS. Watch at 1.5x

Glad I waited till the end , before the end I was going to ask about noise from switching . Thanks again John

One of the Best demonstration I have ever seen. Carry on good work. Thanks.

I really like you how you deliver your explanation to all of your videos. Thank you for being there for us beginners. More power to you sir.

The optocoupler feedback network is for voltage regulation only. The over current protection is via pin 3 and the voltage across the emitter resistors on the switching transistor.

THANKS PETER! ANOTHER GREAT VIDEO! I bought a swithcing mode supply in the form of a charger inverter for a big sail boat. It was very noisy, so I decided, let's delay the switching noise so it is 180 degrees out of phase and mix that back in so it cancels itself out. IT WORKS GREAT! I am kind of new to the whole ham radio thing and all those fabulous new products engineered to separate us from our money, so I had no idea MFJ and Palstar already made phase inverting noise reduction boxes. I made a linear supply for the bench from a huge buck boost 24/48 volt secondary dry transformer, regulators (zeners) and lots of transistors, to the tune of 200 amps of 12-14 volts of very clean DC. It weighs a tonne but, it's very quiet. The charger inverter will give me 100 amps of 13.6 volt DC power, and off a battery of batteries I can get 25 amps of 120 VAC, "AND" the 100 amps of 13.6 volts. Off batteries that 13.6 volts is as about clean as it gets. . 73s to you and your's!

this video is well matched to learning students; I feel( at last) as though I have, for the first time in my life, found a vehicle for understanding abstract concepts of electrical circuitry. Please give us more of exactly-the-same deliverance (excellent !) Congratulations.

Very nice and clear explanation, also your english pronunciation is much better than the native speakers, at least for me. Thank you very much.

Excellent video, very informative, having worked on various switching power supplies my self I sort of had an idea how they work but never really took the time to delve into them too much, when you are trained to do one job such as setting them up and testing them on a jig I dont think you ever get to appreciate the actual idea of how they work....And yes it is very easy to get a nasty electic shock from one as I have found out on numerous occasions..LOL....Fantastic....Keep up the great vids....73 from the U.K...

I love the video and the content. It is very useful information. I am amazed that you have the schematic and the datasheet for your power supply! The ones I salvage are very hard to find any information on. Thank you very much for taking the time to make it.

Informative video. Probably one of the best I came across. Thank you so much Peter!

Danke für diese sehr gut verständlichen Einblick.

It was a wonderfull n extremely comprehensive explaination of more than the basic working of SMPSs by the very intelligent gentleman although his english was good enough to follow (i think he being a german) it was very clear n highly informative !! A big Thank You to the gentleman !!

Nice Work, continue lighting us up

Awesome my friend.. Another excellent presentation and another one for my Favourites regarding SMPS. Cheers Peter John

This helps me a lot. Thank you sir and God bless.

Excellent, basic tutorial. I get the idea of the Switching Mode PS. I wish the ones I com across were as simple as this one.

Had a question about this subject on a mock ham test, Pete thanks for taking the time to explain 👍

Mr Carlson's Lab video too was very informative n well presented n made....u guys r really more than good professor stuff !!! Thanks a million !!

Thank You for all the information, it help to understand switching power supply!

Excellent explanation buddy, much clearer than when it was explained to us many years ago. Back then it was all done with a projector and slides, really like the emphasis on Safety as well. SMPSU'S can really bite if you don't treat them carefully.

@nspk really my past learning became perfect after watching this video. Great learning experience !! Mechanics having problem to attend SMPS must watch this video.

A very helpful video on understanding the basics of SMPS!

another GREAT video from you SIR, thanks a lot for sharing your precious knowledge

Very well explained with practical demo. Looking forward for many more such videos. Vielen Dank.

GREAT VIDEO on SMPS enjoyed the entire presentation...!!!

What a great video! Thanks for an excellent explanation.

Thank you very much for a great SMPS master class!!!! I really appreciate it...

I dont think i will ever come across a simple tutorial like this.. nice work man..

Excellent video, excellent explanation, understandable English more because I am Spanish-speaking. Thank you very much for sharing your knowledge

Very nice detailed explanation,keep on making these nice videos.

Often wondered what happens in a switch mode power supply. Thanks for the video.

Thanks very much for this Peter. Taking the mystery out of SMPS's !

Thanks for taking the time to explain SMPS. I hope to one day be better with electronics than I am at work working.

A very clear, well structured presentation, sincerely thank you very much for your generous contribution. I had an unclear idea about this topic but now its totally clear to my. As far as I know the modern welder machines are based on this same principle and I would ask you if possible a video of this theme. Greetings from México.

Amazing video! I am now subscribed, and I cannot wait to see what other videos you have!

Keep going, congratulations. Great datasheet details.

Excellent video you really know your stuff Use to work on these and its all coming back to me watching this

Knew about the a long time but had no clue to their working. Now know a lot more. Thank you. Basically its to up the frequency so the transformers can be a lot smaller. Then make use a quite a few ways of protection.Thank too for speaking in English - must be quite a bit harder doing that.

Hi Peter thankyou for this video after watching this video it gave me the confidence to fix my caravan psu the parts cost £2 i replaced the switching transistors and its running fine thankyou

Thank u ☺️ for the videos , i appreciate all the work you do.keep up bro

Respected sir, thanks a lot. one of the best video on smps.

Such an excellent presentation,explaining very nice... thanks

Thank you for a most informative video. Well done!

Higher frequency was used in planes with 440Hz, even before switching power supplies to make them much lighter. Of course switchinh power supplies go WAY BEYOND 440Hz, making them tiny for the power they control! Good video, thank you :)

Thanks Peter for this tutorial on SWPS. Very well done my friend.Thumbs up :)

Thank you very much Peter for posting these awesome informations

Great video! I am trying to repair smps from an hp spectrum analyser, very daunting but the principles seem the same as you have layed out here.

Great video Peter

I haven't seen better explanation for SMPS than yours.Thanks.

Das ist eine sehr gute Erklärung von SWITCH-MODE POWER SUPPLY. Vielen Dank Herr.

Good video Peter on PWM power supplies, got to you videos via Mr. Carlson's Lab. Thanks Paul.

So Informative video this one 👌, Huge thanks

Thank you for this important lesson !!

Thank you sir, you cleared my all doubts about flyback converter.

Vielen Dank sehr geehrte Herr! Ihre Progamme sind immer sehr ausgezeichnet. WA9AAV

sir , smart thing u did , to connect Ground of scope probe to Load side ground , and not on the Input / High Voltage Side Ground............... Thanks For The Video ........

WOW! I now know how switching power supply works! good video men.

great video~ I know from nothing to now i know everything of switching power supply~ thank you~~

Cool and very descriptive. Thank you!

Great video. Thanks for making it. well done!

Great explanation. I like this video.

Excellent explanation!

Thank you for an excellent video. I picked up a few things that made understanding SMPSs easier. So many tutorials on this subject are just plain confusing but yours is clear and very informative. Keep up the good work! :)

Your explain very simple and plane.Thanks a lot.

Very well done from brian Wb8idy USA please keep on doing these I learn alot

Just came across your video, found it very informative, you now have a new sub👍👍