And more importantly for many--HOW he teaches it. Personally speaking, Donkey has suceeded where professors, instruction and textbooks have failed. For that, I'm especially grateful🥺😁🤗😎🤙🤙🤙 Much respect and gratitude from the Aloha State. Keep doing good things brotha, gems like your channel are appreciated more than you know🤙
GOOD HEAVENS MAN!!! i HAVE BEEN DESIGNING SWITCHING POWER SUPPLIES SINCE 1969 AND YET i HAVE BEEN FASCINATED BY YOUR VIDEO SERIES. i HAVE WATCHED ALL THE PREVIOUS ONES...THIS IS #8 THAT I AM WATCHING... HAHAHAHAHA. THANKS FOR SHARING... YOU ARE DOING A FANTASTIC SERVICE TO THE COMMUNITY. I WOULD NOT HAVE THE PATIENCE TO DO THIS STEP BY STEP METHOD.
Thanks for the positive feedback ;) Many people do not realize how much time it takes to do a detailed step-by-step explanation of how switch mode PSUs work, so I appreciate your comment, since you know the deal.
Great video series explaning the working of switching power devices. I had heard of duty cycle, but never paid any attention to what it means. Now I know..
@Blondie SL Thanks for the encouragement. The reality is, that most videos I am just winging. The time is mostly spent on producing the slides, and editing/rendering the videos on my old aging workstation.
Ahhh, I have forgot indeed. I will add it later, thanks for the reminder. After I am done with the basics of SMPS, I will rename it to something like: How SMPS works, or something similar, and create a series on practical repair.
Thanks for the comment. Although PWM is considered by many as a "boring" topic, I tried to make a general overview of PWM so that people know what is done in the switch mode supply.
@Blondie SL Well, Louis Rossmann said the same in many of his videos: if you do not like the content, hit the X button on the upper right corner. I do not dare to say that, since I do not want to offend people.
Glad to have you back in good health , after finishing smps in theory can you please explain how the side components react with the circuit and why actually they need to be used like the sense resistora and filter capacitors, thank you in advance ...
In this series *all components* will be covered before I go into practical repair. In fact, I intend to do a basic series on general electronics, like voltage, current, power etc. and also an introduction to the semiconductor devices.
@@DonkeyLearningIT in fact you take a long time to go through these things , 3 videos just frequency . Sense resistor has to be used because otherwise how will you know what is in it , every electronic meter , like voltmeter or current meter, is a resistor , there is no other way to know what is going on . That is why its used , nothing else will help . Sense resistor is just that , we use it to know what is in the circuit , by looking what happens with the resistor , if it heats up that means power is going through , if not its not . for example We use Caps , Coils and resistors to filter the AC power , because most devices require steady supply of power , not all but most , Logic Semiconductors cant work on AC , that is why we filter this power , its useless to PCs as AC , needs to become DC of fixed voltage , that is done by filtering with capacitors coils and resistors . The higher the AC frequency the lower the loses in power conversion, hence best power is SMPS or switching AC power , like you know , we cant transmit DC over power lines , has to be AC , the higher the frequency the less transmission wires heat up , hence less loses in transmission or conversion , simple
@@dedskin1 Pavle Pavlovic....In fact, you could not be a teacher. It takes patience and consideration of all the details. It is actually a selfless and exhausting thing to do- to set out to truly help someone learn. I for one salute this man for what he does in these videos. I have learned so much, and all it costs me is time. But, time in exchange for knowledge is priceless.
None sense. This is the best SMPS explanation around right now. You got over 50 likes in less then first day putting it out hah. This way of walking through it is great to. Also I'm a electronic nerd a lil bit maybe so the layout flow always keeps me excited haha. Like feedback and amp talk next? Stoked. Stay healthy! @@DonkeyLearningIT
Since you're talking about using an oscilloscope to debug a power supply, would you recommend to debug a it while it's running (when the 400V capacitors are live) or would you rather unsolder each component and test them individually (a lot of work), or probe the board (potentially inaccurate)
Hi. Your videos are so informative and thorough. Just wondering, I have a switch mode power supply connected to the AV Receiver. After the receiver has fully warmed up. I can hear some frequency noise inside the receiver. Would a failing filter capacitor exhibit this problem? Thanks..
Well, I tried to make a video during those 10 months, but it sounded awful. I hated to listen to it so much, that I stopped and deleted the material. Plus my neighbors above me were drunk-fighting all the time until the police finally took the guy, so now it is a bit more peaceful, and there are less human screams recorded when I try to produce a video ;)
@Blondie SL Thanks for the comment. I have moved in February to a new place where I have less place and pay more money. However, had some real trouble in the family so I had no time/good mood to produce content.
@@DonkeyLearningIT Hi Don, I am now fan of yours ... I may be younger to you but you have lot of Knowledge (sharing through your Content) and Wisdom (spreading through your Comments). Don't worry about Troubles , Hang out with some good friends they will make life Joyful ... add me as your friend too ... I am short of Friends :)
@Stan DuttleThanks for the kind comment man, and also I am happy that you liked the content. Regarding health, I think that most of us could use better health and better luck. Wish you all the best as well!
12:52 Hi. I'm a bit confused. In the last video you said that when the switch is closed, the PWM signal is down...and when the switch is open or off, the PWM signal is up. Now you are saying it is the other way round??? Which way is it? Many thanks.
here is the link to video #9 ruclips.net/video/sVNbAbjPbmY/видео.html if you want to see the feedback concept directly, I guess go to #11 ruclips.net/video/zLKJxveX0zY/видео.html
So, in this example PWN controllers are set to 20KHz in and the PWM rate (duty cycle) changes within the 1ms period. I have found PWM controllers on eBay with no mention of PWM frequency and others at 12KHz and 16KHz. What is the prerequisite in determining which PWM controller's frequency is applicable? Also, are all PSUs in computers today of the same PWM frequency? Say, at 20KHz or does it vary from manufacturer to manufacture? Does a high frequency mean greater cost but better quality of output? I note that there are grades in PC PSUs based on efficiency. Does a higher frequency help towards that efficiency?
In the video example actually I use 1kHz to make the math simpler, this is how we get the 1ms period. For 20Khz the period would be only 50us. Yes, in theory the duty cycle would change from 0ms up to the 1ms range, depending on the amount of power needed. The switching frequency varies from one product to an other, it is up to the engineer to select a frequency based on the components what are available. 12Khz is a really low frequency, even with my 40 year old donkey ears I can hear that characteristic whine. Young people will go crazy next to such a supply, since their ears are more sensitive at high frequency. When it comes to efficiency, there is always a tradeoff between so called switching losses and so called inductor losses, so engineers do simulations with special software to optimize the efficiency. Also, to improve the efficiency, one will have to use more complicated topologies which I will cover in later videos. It is more complicated, so I cannot simply explain it in a comment.
I wish I was a hive mind composed of thousands of people (or at least a chinese "like" farm owner) so that my subscription and like would have a bigger impact.
Yeah, drops would be good, since my heating just got broke down, and my landlord have nicely informed me, that until the coming Monday nobody will be sent to repair the darn thing. I am glad that in about two months I am moving to somebody's converted garage and pay there rent. When it comes to health, we will see how it develops. Hopefully it will get better.
@@cagmito76Ahhh, I was fantasizing about moving to some warmer place, trust me. In fact, a large number of German speaking retired people move to Portugal, since they get tax benefits (no tax for the first 10 years) and their health improves as well. Hopefully some day I will have enough money to afford it...
@@cagmito76For some reason your follow-up comment is not displayed, since YT is broken again as usual. Anyway, how do you mange to live in Portugal for three months from only 1000Euros. It cannot be that cheap since even in a third world country it would be tough to live on 300 Euros a month, so you must be really penny-pinching money, which is good.
@@cagmito76You are *living the life* man, good for you! Got an other colleague from the UK, he was in every continent and enjoyed life, so you Brits are good at it ;) Still, I am shocked to hear that Portugal can be this cheap. Many digital nomads on RUclips claimed that for them is way too expensive, so now I am wondering what type of lifestyle those people got.
@@DonkeyLearningIT what is I am saying is that I waste my too much time entire 2 year all this mathematical calculations formulas and many types of data sheets but at the result I got nothing I just watch 9 of videos from donkey learning IT everything is in a set up in my mind now I feel so donkey because I waste my too much time And now I am happy with it☺☺☺☺ thank you so much for your great work. I am waiting for new videos. Sir
@@DonkeyLearningIT for just information I repair my first switch mode power supply Board of a DVD Player which is just have a open circuit optocoupler I am very happy now
@@captainblackbody6350I am really glad if the contents what I put together so far has helped somebody. As I wrote, it does not make sense to jump into the middle of things without covering the fundamentals. Also, there should be a clear path in the fundamentals as well, what people can follow from video to video. This is why I try not to jump from one topic to an other way too fast before I explain the basics.
@@DonkeyLearningIT at now I am 3 phase 420v linear supply mechanic nothing much to do I always want to become true electrician , always waiting for your new lecture with a different thinking
All that waffle for a switch.. you don't have to keep repeating everything. You would be a good presenter if you learned to say things once. This is not a criticism by the way.
And more importantly for many--HOW he teaches it. Personally speaking, Donkey has suceeded where professors, instruction and textbooks have failed. For that, I'm especially grateful🥺😁🤗😎🤙🤙🤙
Much respect and gratitude from the Aloha State. Keep doing good things brotha, gems like your channel are appreciated more than you know🤙
I want to hug you donky.. finally I found a teacher who understand what he teaches..
Thank you for this series, you have a gift of teaching that expresses the concepts clearly and understanble. Good work!
GOOD HEAVENS MAN!!! i HAVE BEEN DESIGNING SWITCHING POWER SUPPLIES SINCE 1969 AND YET i HAVE BEEN FASCINATED BY YOUR VIDEO SERIES. i HAVE WATCHED ALL THE PREVIOUS ONES...THIS IS #8 THAT I AM WATCHING... HAHAHAHAHA. THANKS FOR SHARING... YOU ARE DOING A FANTASTIC SERVICE TO THE COMMUNITY. I WOULD NOT HAVE THE PATIENCE TO DO THIS STEP BY STEP METHOD.
Thanks for the positive feedback ;)
Many people do not realize how much time it takes to do a detailed step-by-step explanation of how switch mode PSUs work, so I appreciate your comment, since you know the deal.
Thanks Donkey. This video is very informative and presented in simple way. This helped me repair my TV's Power Supply Board.
Thank you for the great video on the fundamentals of PWM and Duty Cycle Ratio !
This series is awesome. Thank you.
Thanks for the positive comment!
Great video series explaning the working of switching power devices. I had heard of duty cycle, but never paid any attention to what it means. Now I know..
Welcome back. Missed you.
Ahh, you got the first comment, good on you ;)
I am glad that I had a bit of time and health to sit down and put together an other video.
Thanx for the videos! I learned more in 30 minutes than in 2 weeks. Perfect work! I will watch your other videos. Best Regards!
Excellent demonstration as other tutorial.thanks for such a nice video.
Thanks for watching and commenting as well!
Easily understood, the way you teaching is simply superb sir
brilliant video and very well explained. great teacher. thank you.
Thanks for the feedback. It takes me forever to make these videos due to my editing "skills".
@Blondie SL Thanks for the encouragement. The reality is, that most videos I am just winging. The time is mostly spent on producing the slides, and editing/rendering the videos on my old aging workstation.
Donkey! You've set the example by following through on this subject. I always knew you'd be back.
If you have seen the movie "The hustler", in the final scene Paul Newman is breaking the balls, and looks into the camera: "I'm back!".
Thank you for No 8, looking forward for no 9, Many thanks, best regards Jo
Now I can build my own generator from scratch....Excellent tutoring
Thanks for the comment! Though, using an NE555 is a good start to build a small SMPS driver for learning purposes.
"Hard fully on?" What a character!
thank you. You have forgotten to add this to your playlist :)
Ahhh, I have forgot indeed. I will add it later, thanks for the reminder.
After I am done with the basics of SMPS, I will rename it to something like: How SMPS works, or something similar, and create a series on practical repair.
@@DonkeyLearningIT sounds great. Looking forward to it. Thanks for sharing your knowledge.
Nice Explanation
Thanks for watching and commenting!
Let's get high! Cheers Donkey, a great resource, all the best!
Thank you for the recent video missed your videos on switch mode power Supply repairs theory and operation.
Love your videos and the great, very interesting and practical content. Please continue your great work. It is much appreciated!
thanks for sharing your knowledge on this subject...is very helpfull.
Thanks for the comment. Although PWM is considered by many as a "boring" topic, I tried to make a general overview of PWM so that people know what is done in the switch mode supply.
@Blondie SL Well, Louis Rossmann said the same in many of his videos: if you do not like the content, hit the X button on the upper right corner. I do not dare to say that, since I do not want to offend people.
was very eagerly waiting
Trust me, I am glad that I finally had the time to get back to the channel. I am glad that people are still watching the content.
To day (sep14,2019) I have watched 7 videos and I am watching 8th one.
Thank you very much..
Nice work.
Many thanks!
Glad to have you back in good health , after finishing smps in theory can you please explain how the side components react with the circuit and why actually they need to be used like the sense resistora and filter capacitors, thank you in advance ...
In this series *all components* will be covered before I go into practical repair.
In fact, I intend to do a basic series on general electronics, like voltage, current, power etc. and also an introduction to the semiconductor devices.
@@DonkeyLearningIT in fact you take a long time to go through these things , 3 videos just frequency .
Sense resistor has to be used because otherwise how will you know what is in it , every electronic meter , like voltmeter or current meter, is a resistor , there is no other way to know what is going on . That is why its used , nothing else will help . Sense resistor is just that , we use it to know what is in the circuit , by looking what happens with the resistor , if it heats up that means power is going through , if not its not . for example
We use Caps , Coils and resistors to filter the AC power , because most devices require steady supply of power , not all but most , Logic Semiconductors cant work on AC , that is why we filter this power , its useless to PCs as AC , needs to become DC of fixed voltage , that is done by filtering with capacitors coils and resistors .
The higher the AC frequency the lower the loses in power conversion, hence best power is SMPS or switching AC power , like you know , we cant transmit DC over power lines , has to be AC , the higher the frequency the less transmission wires heat up , hence less loses in transmission or conversion , simple
@@dedskin1 Pavle Pavlovic....In fact, you could not be a teacher. It takes patience and consideration of all the details. It is actually a selfless and exhausting thing to do- to set out to truly help someone learn. I for one salute this man for what he does in these videos. I have learned so much, and all it costs me is time. But, time in exchange for knowledge is priceless.
@@amicklich6729 cool for you , but it takes a lot more , takes few books not few videos but fdo it as you like it
Welcome back sir
If you have seen "The color of money", in the last scene Paul Newman says: I'm back!
and breaks the balls on the billiard table ;)
Please put links to next and previous videos in the description !
Thanks you sir and a BIG SALUT
Big salute to you too as well. I expected that by this time everybody would have unsubscribed from the channel ;)
Beautiful examples, excellent.....
Thanks for the positive feedback! I hope you will watch the full series if you got time.
Very glad that you are back!
I am also glad that people are still around to follow the contents.
Hopefully I will be able to release videos more frequently...
Welcome back comrade, excited to check out the new stuff!
Thanks for dropping by!
To be honest, I thought that in the meantime most people have already unsubscribed...
None sense. This is the best SMPS explanation around right now. You got over 50 likes in less then first day putting it out hah. This way of walking through it is great to. Also I'm a electronic nerd a lil bit maybe so the layout flow always keeps me excited haha. Like feedback and amp talk next? Stoked. Stay healthy! @@DonkeyLearningIT
Welcome back, and very well explained ,thank you !!!
Glad to see you back on my channel! Hopefully I will be able to produce now more videos.
excelent👍
Super explaination
Thanks for the comment and for the nice cat picture ;)
Since you're talking about using an oscilloscope to debug a power supply, would you recommend to debug a it while it's running (when the 400V capacitors are live) or would you rather unsolder each component and test them individually (a lot of work), or probe the board (potentially inaccurate)
Hi. Your videos are so informative and thorough. Just wondering, I have a switch mode power supply connected to the AV Receiver. After the receiver has fully warmed up. I can hear some frequency noise inside the receiver. Would a failing filter capacitor exhibit this problem? Thanks..
Donkey Learning IT
Waiting for you for 10 months !
Well, I tried to make a video during those 10 months, but it sounded awful. I hated to listen to it so much, that I stopped and deleted the material. Plus my neighbors above me were drunk-fighting all the time until the police finally took the guy, so now it is a bit more peaceful, and there are less human screams recorded when I try to produce a video ;)
@Blondie SL Thanks for the comment. I have moved in February to a new place where I have less place and pay more money. However, had some real trouble in the family so I had no time/good mood to produce content.
@@DonkeyLearningIT Hi Don, I am now fan of yours ... I may be younger to you but you have lot of Knowledge (sharing through your Content) and Wisdom (spreading through your Comments). Don't worry about Troubles , Hang out with some good friends they will make life Joyful ... add me as your friend too ... I am short of Friends :)
@@uelectron1513 Thanks for the positive comment! I hope that soon I can produce and upload new content.
thank you.keep going
Thanks man! Hopefully I will have better health and more time to produce more videos ;)
@Stan DuttleThanks for the kind comment man, and also I am happy that you liked the content. Regarding health, I think that most of us could use better health and better luck. Wish you all the best as well!
12:52 Hi. I'm a bit confused. In the last video you said that when the switch is closed, the PWM signal is down...and when the switch is open or off, the PWM signal is up. Now you are saying it is the other way round??? Which way is it? Many thanks.
Welcome back bro. keep going
Thanks man ;)
@Yo MingI have a long beard and black hair (OK, by now I am almost bald).
I do not know in which category that fits...
Yo Ming Yes bro, I am Arabic :) I am Engineer
@@waadissa It is all fine until people are happy and friendly. I think that he did not meant it as an offensive question.
where is video number 9? Please
here is the link to video #9 ruclips.net/video/sVNbAbjPbmY/видео.html
if you want to see the feedback concept directly, I guess go to #11 ruclips.net/video/zLKJxveX0zY/видео.html
So, in this example PWN controllers are set to 20KHz in and the PWM rate (duty cycle) changes within the 1ms period. I have found PWM controllers on eBay with no mention of PWM frequency and others at 12KHz and 16KHz. What is the prerequisite in determining which PWM controller's frequency is applicable? Also, are all PSUs in computers today of the same PWM frequency? Say, at 20KHz or does it vary from manufacturer to manufacture? Does a high frequency mean greater cost but better quality of output? I note that there are grades in PC PSUs based on efficiency. Does a higher frequency help towards that efficiency?
In the video example actually I use 1kHz to make the math simpler, this is how we get the 1ms period. For 20Khz the period would be only 50us. Yes, in theory the duty cycle would change from 0ms up to the 1ms range, depending on the amount of power needed.
The switching frequency varies from one product to an other, it is up to the engineer to select a frequency based on the components what are available. 12Khz is a really low frequency, even with my 40 year old donkey ears I can hear that characteristic whine. Young people will go crazy next to such a supply, since their ears are more sensitive at high frequency.
When it comes to efficiency, there is always a tradeoff between so called switching losses and so called inductor losses, so engineers do simulations with special software to optimize the efficiency.
Also, to improve the efficiency, one will have to use more complicated topologies which I will cover in later videos. It is more complicated, so I cannot simply explain it in a comment.
I get a window from a glass, he must get a window from a glass. I get a step, he must get a step.
YAY :D
Good to see you too! I am glad that I finally had time to make a video ;)
"Free spirits - high" lol
Yeah, now most people seem to be oldschool, and not enjoying the good old free spirit from the 60s ;)
I wish I was a hive mind composed of thousands of people (or at least a chinese "like" farm owner) so that my subscription and like would have a bigger impact.
I am happy for every comment, and in particular it gives me joy if people learn something from me!
Southpark! Haha :-)
Yep, finally someone got the reference ;)
Though, my favorite character is Randy and uncle Jimbo.
Us MICRO..uF ultra ferid
Well, pronunciation will strongly vary from country to country. Even Ampere is pronounced totally differently by French speaking people...
How can you speak in monotone for so long....Good Job !!
I am not sure whether montone is good, I would think that is bad. Sorry, I will try to make it more 'fun' in the future videos.
Is this video deleted
What do you mean?
For me it is still in the list, but I do not know how it looks for a viewer.
Donkey Learning IT
What about your health, specially Cold ? I advised you to take Dropi ( Made in Iceland).
Yeah, drops would be good, since my heating just got broke down, and my landlord have nicely informed me, that until the coming Monday nobody will be sent to repair the darn thing. I am glad that in about two months I am moving to somebody's converted garage and pay there rent.
When it comes to health, we will see how it develops. Hopefully it will get better.
@@DonkeyLearningIT Portugal for winter is only cure for health .
@@cagmito76Ahhh, I was fantasizing about moving to some warmer place, trust me. In fact, a large number of German speaking retired people move to Portugal, since they get tax benefits (no tax for the first 10 years) and their health improves as well. Hopefully some day I will have enough money to afford it...
@@cagmito76For some reason your follow-up comment is not displayed, since YT is broken again as usual. Anyway, how do you mange to live in Portugal for three months from only 1000Euros. It cannot be that cheap since even in a third world country it would be tough to live on 300 Euros a month, so you must be really penny-pinching money, which is good.
@@cagmito76You are *living the life* man, good for you! Got an other colleague from the UK, he was in every continent and enjoyed life, so you Brits are good at it ;)
Still, I am shocked to hear that Portugal can be this cheap. Many digital nomads on RUclips claimed that for them is way too expensive, so now I am wondering what type of lifestyle those people got.
1KHZ 1200 60 HERZ...50 HERTZ EURO..
I feel soo DONKEY 😮☺😊
Naah, the Donkey is only me, since I learn slow. My viewers are always smarter!
@@DonkeyLearningIT what is I am saying is that I waste my too much time entire 2 year all this mathematical calculations formulas and many types of data sheets but at the result I got nothing I just watch 9 of videos from donkey learning IT everything is in a set up in my mind now I feel so donkey because I waste my too much time
And now I am happy with it☺☺☺☺ thank you so much for your great work. I am waiting for new videos.
Sir
@@DonkeyLearningIT for just information I repair my first switch mode power supply Board of a DVD Player which is just have a open circuit optocoupler I am very happy now
@@captainblackbody6350I am really glad if the contents what I put together so far has helped somebody. As I wrote, it does not make sense to jump into the middle of things without covering the fundamentals. Also, there should be a clear path in the fundamentals as well, what people can follow from video to video. This is why I try not to jump from one topic to an other way too fast before I explain the basics.
@@DonkeyLearningIT at now I am 3 phase 420v linear supply mechanic nothing much to do I always want to become true electrician , always waiting for your new lecture with a different thinking
I'm watching the series, but the repetition of very simple topics is getting unbearable. Hope next one is more straight to the point.
Haha he said hard on
Well, that is the "technically correct" term ;)
Zero is not a numbers...60 herz khz1200 tos tense of sec...(.)(-)(__) this are three signal digit pulses tone...sec tan cos sin
All that waffle for a switch.. you don't have to keep repeating everything. You would be a good presenter if you learned to say things once. This is not a criticism by the way.