Now I understand a circuit diagram I saw where they picked up one supply from before the bridge rectifier! Of course, to reduce power dissipation because its a lower voltage! Thank you DiodeGoneWild, yours is one of the best electronics channel on youtube.
Very glad I found your channel. You/re doing some of the very best electronics content on UA-cam right now and you deserve a much larger audience. This video is the clearest explanation of flyback PSU operation that I've seen. Well done!
I've watched this several times; each time a little more make sense. I'll have to watch a lot more times before I understand it fully but I have learned a lot up to now. Great video with excellent explanations at each stage.
Glad u are learning such archaic subject, but feel free to ask questions. This guy is good but he has omitted many key aspects of SMPS such as inductance of the flyback, stability criteria, efficiency calculations based on power losses.
Videos like this are what got me to support via Patreon, even though I don't have a job right now! I really enjoy learning through schematics explained.
WOW!! I'm just a beginner and I completely understood everything you said, some of the math and how you got there is over my head but that is by far THE VERY BEST explanation of a fly-back PSU ever. I cant wait to see pt 2. THANK YOU for doing this.
I stumbled upon your video & at 1st i simply could not understand what you were saying but after a couple of minutes, i have to say HOW WRONG I WAS! Your explanation of SMPS is brilliant and i learned a some new stuff about the things. Love the way you used a hand drawn back engineering diagram and proceeded to trash it with all the info a symbol to just how complicated an SMPS can be... ! I've subscribed to your channel.
WOW! Thanks. I finally understand what you mean about the TL431 "turning on." Sorry if I misunderstood. I'm genuinely just trying to learn and understand this stuff myself. I'm glad you mentioned that bit about the auxillary winding voltage. I hadn't thought about that one. I was mainly concerned with the secondary side components. The ones I've modified don't get hot or show problems, but as I tell anyone, I would never leave a modified supply powered on unattended. Just now I looked at all of the switching supplies I've modified to look at the circuit. I'll still need to check the actual voltages but I will need to finish my current project first to make space. All but one of the supplies I've modified have a zener on the auxiliary circuit for the switching IC power rail. I haven't retraced them completely, but at a glance the circuit appears to be set up to clamp the voltage for the chip. I know the dissipation and voltage ratings are still vital, but the examples I have appear to compensate for auxillary power fluctuations to some degree. I really appreciate you showing all of this. Honestly I got the idea of modifying the output of a switching supply after taking apart a Sony camcorder power supply that had a rating of 9.5volts. After taking it apart I noticed it had a trim pot on the secondary side. It's adjustment set the output from around 6 volts to around 18 volts. Later I came across another supply that is from a company called "Rhino" that sold a "Universal AC/DC Adaptor" model: PSNC-75M. It has a switch on the bottom that sets the output voltage at 12, 15, 16, 18, 19, or 20 volts. It actually rates the output on the label at: 12V, 5.4Amax DC 15/16/18/19/20V, 5A-3.75Amax (That's an exact quote of the label) I haven't torn it apart because I use it for an ancient laptop, but it also has an auxiliary USB 5V output rated at 2A which is super handy. After watching your video here I'm really tempted to take it apart to figure out the topology. I've also been goofing around with the little adjustable supply I made the video about modifying awhile back. I'm trying to add a linear regulator to adjust the voltage lower, but I'm waiting on some dual pots in the mail as thats the only way I know of to adjust the switching supply and regulator to track each other without adding an op amp circuit. Any ideas or suggestions are more than welcome :) BTW, could you put "flyback" in perspective please. I think I understand the basics, like the charge is stored in the core. I got a bit confused after reading that there are continuous and discontinuous types of flyback operation. I have a hard time putting the different terminologies into perspective for the different switching designs. I think I understand buck/boost/buck-boost, none isolated/off line and those types of basics. I have a hard time understanding what is branding terminology versus topology after that point. I vaguely recall "Switch Mode Power Supply" is a branding term. I came across "Peak Mode" used to describe a controller/topology at some point early on in my exploration of these things. I originally associated that with the simple designs that use a single voltage feedback loop and a current sense resistor like a MC34063 etc. I thought of the dual feedback chips as "PWM" because the first time I saw a chip that was labeled as PWM was when I looked up a TL494. The first time I saw the term "flyback" was in reference to the high voltage transformer used on old CRT televisions, so I thought the design was more high voltage specific. I've realized this is incorrect, but I have a hard time understanding how it fits in to switching DC converter designs over all at this point. I think someone with a thorough understanding should do a video on an overall abstract explanation of different switching designs that tries to cover 90-95% of the designs used regularly in practice. Maybe they could also explain the basic evolution of things like power mosfets and bjt's as it relates to switching IC designs. I know I hit a learning-wall when I discovered the output current limitations of the MC34063 for myself. I think it is due to the Darlington output design. IIRC I read somewhere that this design was done before power mosfets, and that's why it sucks, but I could be wrong. Seriously, thanks again for all of your efforts. I recently noticed your website link in a video as well. I bookmarked so many pages I had to make a folder for it. Very much appreciated, -Jake
I would like to encourage you to keep making videos like this periodically. Even though it does not get the views of the simpler ones its important to add proper content. I made a 5 videos on solar panel hobby project. Though it has very few views I am not daunted. It was really for me to put down all the info in one place and spend the time to consider all angles. I even picked up an error assumption I made in the second video when I did the calculations for the third.
Damn great video. Thank-you-so-much, Dan, for explaining it so clearly. Videos like this are very useful because they're not just simple tutorial telling you how to do something, what to change, what to remove and so... such materials are much more useful. I almost feel how my knowledge and... understanding grows up! Thank you. :) Keep doing this, my man!
You are an Electronics Master . Thank you for sharing your knowledge. Keep it up with this type of explanations. My motto is P.S.'s and electronics devices are designed and built from high knowledge people like you, Masters and PHds. Trying to make circuit changes on P.S. can be fire hazard. You guys can see how complex are calculations on semiconductors, I even see more complex equations and simulations. Please do not attempt to change main circuit. If you want you can add external DC-Dc converter.Namaste.
Great video - very well explained! Love it! Would be great to hear your take on why the outputs are not at the rated voltages (would this be linked to e.g. bad capacitors?)
I have been binge watching your videos ever since UA-cam recently recommended one of your small power supply videos to me after watching a BigClive video and yesterday and today was spent tearing down every single sketchy Chinese electronics device I have ever purchased!!!! Holy Fuck was there some dangerous USB chargers 🔌 with Class X2 1KV capacitors ACROSS THE MAINS AND IN A SPOT THAT WAS CLEARLY MARKED CY1!!!!!! I’m learning a lot about safety from your Super Sketchy Chinese Device Videos and my favorite part is always the reverse engineering with schematics and extremely in depth explanations of what each piece does and why you’re supposed to be using certain components specifically because of safety!!!!!
In 6:20 the 10r is to limit the current. The -12v goes to the two motors (spindle and optical assembly driver) also this -12v is used to generate sync pulses of the composite video signal. The 470r discharge the capacitor, because some overshoots happens and the peak voltage will charge the capacitor gradually to 13v or more. If you remove this resistor you can check it go beyond 16v sometimes, mainly when the 5v is at full load and the regulator is trying to compensate with a large duty cicle.
Everytime i watch this video i learn something more! Really great and very deep explanation of switch mode PSUs in flyback topology! So thank you very much for this excellent explanation! I just have one question: why is the voltage per turn different in each polarity? Is it mainly because of different slope steepness when turning on and turning off (transistor/mosfet) as we know the change of current per time is relevant for the induced voltage? Or is it mainly due to the duty cycle as you explained? Or does both relate to each other so that it comes to the same result? Not absolutely sure about this?
Very very very very outstanding explanation. 20:56 You say the voltage on the diode will be 48v Is that at the anode or between the anode and the cathode of the diode ? Is that voltage dc or ac ?
I have already made a video about how does an ATX work: ua-cam.com/video/Cur3nQjjyyo/v-deo.html And a video about how to repair it: ua-cam.com/video/HcYFbCqM61g/v-deo.html
This will be a fantastic video. There are so many class d amps from china (smsl, fosi, doux etc.) thier circuits looks something like you can give a good description for people like me who are always interested on how circuits works. And since they are all made in China at least we are all able to know how good thier circuits are built.
Downloading the data sheets for the ICs that are used is a good start. Often the application notes in the data sheets will explain what increasing or decreasing component values around the 'chip' would actually do .
You can choose where you put your ground or 0 level voltage. So he could have described the power supply output voltage as 0V (-12V) +12V (0V) +17V (+5V) +24V (+12V) Or one could add 100V to every level. In this case it’s probably most convenient to define the 12V section as -12V, 0V, +12V And the other section just as 0V, 5V. You could also imagine a positive voltage as a pushing force and a negative voltage as a pulling force if that would help.
Nice! But why 480p? Not related to that but every time I see a switching power supply I can't help but think of the time when I connected one to 120v AC thinking it would work like a regular linear transformer, boy was I wrong! That was years ago though when I did not know about SMPS's.
The fact that the 12V supply is unregulated might be because it is feeding the input of various DC-DC converters as is common on PCs. It also might only be used for analog audio circuitry in which case they could be further regulating it down to +/-9 or just using op-amps with a very good PSRR.
Lets keep the transformer/copper losses/diode losses out of this, the paper is full lol :-D No i dont want to know that the output diodes have to be fast recovery otherwise they short the output :) My brain is exploding lol. I have kept similar supplys to yours, i just cant throw away a usable switchmode. I have a dvd player one with mosfets on the outputs for switches, hmm nice. I need to go to "Switchmode keepers Anonimus" :-D
lol, now you see why i stick to repairing, too many dam variables. The concept is easy, but just calculating an ideal transformer requires imaginary magnetic feilds/lines of force/interwinding capacitance and (Thats it, my brain shuts down fully) :-D You and mr johnnnny seem to make some good psus, they work :-D
Agree here too. MrJohhhnnnyyy and Mr legend Danyk should do an episode together or.. maybe they should each put half of a mystery circuit together on a vero-board and mail it to the other to see how it gets completed.. just for fun! And guys - No cheating!
I have a spreadsheet i developed that calculates all major aspects of several types of power supply :) Look up "Mega SMPS Cheat Sheet" on badcaps.net forum.
Now I understand a circuit diagram I saw where they picked up one supply from before the bridge rectifier! Of course, to reduce power dissipation because its a lower voltage! Thank you DiodeGoneWild, yours is one of the best electronics channel on youtube.
It is the best explanation of a SMPS working on UA-cam 👍👍
Your ability to concentrate is inspiring.
Very glad I found your channel. You/re doing some of the very best electronics content on UA-cam right now and you deserve a much larger audience. This video is the clearest explanation of flyback PSU operation that I've seen. Well done!
Precisely! That's why I posted it in Primers and Courses on EEVblog's forum.
I agree. His components tour narrative and follow-up schematic analysis has demystified areas of the SMPS. Big thumbs up.
I ENJOY HIS VIDEOS BECAUSE HE KNOWS HIS STUFF. I ALSO REALLY ENJOY LISTENING TO HIS ACCENT... AMAZING!!!
Best SMPS video on UA-cam... Hats off...
I've watched this several times; each time a little more make sense. I'll have to watch a lot more times before I understand it fully but I have learned a lot up to now. Great video with excellent explanations at each stage.
Glad u are learning such archaic subject, but feel free to ask questions. This guy is good but he has omitted many key aspects of SMPS such as inductance of the flyback, stability criteria, efficiency calculations based on power losses.
Videos like this are what got me to support via Patreon, even though I don't have a job right now! I really enjoy learning through schematics explained.
I could watch this kind of stuff all day. Glad I found your channel.
WOW!! I'm just a beginner and I completely understood everything you said, some of the math and how you got there is over my head but that is by far THE VERY BEST explanation of a fly-back PSU ever. I cant wait to see pt 2. THANK YOU for doing this.
I stumbled upon your video & at 1st i simply could not understand what you were saying but after a couple of minutes, i have to say HOW WRONG I WAS! Your explanation of SMPS is brilliant and i learned a some new stuff about the things. Love the way you used a hand drawn back engineering diagram and proceeded to trash it with all the info a symbol to just how complicated an SMPS can be... ! I've subscribed to your channel.
WOW! Thanks. I finally understand what you mean about the TL431 "turning on." Sorry if I misunderstood. I'm genuinely just trying to learn and understand this stuff myself.
I'm glad you mentioned that bit about the auxillary winding voltage. I hadn't thought about that one. I was mainly concerned with the secondary side components. The ones I've modified don't get hot or show problems, but as I tell anyone, I would never leave a modified supply powered on unattended.
Just now I looked at all of the switching supplies I've modified to look at the circuit. I'll still need to check the actual voltages but I will need to finish my current project first to make space. All but one of the supplies I've modified have a zener on the auxiliary circuit for the switching IC power rail. I haven't retraced them completely, but at a glance the circuit appears to be set up to clamp the voltage for the chip. I know the dissipation and voltage ratings are still vital, but the examples I have appear to compensate for auxillary power fluctuations to some degree.
I really appreciate you showing all of this. Honestly I got the idea of modifying the output of a switching supply after taking apart a Sony camcorder power supply that had a rating of 9.5volts. After taking it apart I noticed it had a trim pot on the secondary side. It's adjustment set the output from around 6 volts to around 18 volts. Later I came across another supply that is from a company called "Rhino" that sold a "Universal AC/DC Adaptor" model: PSNC-75M. It has a switch on the bottom that sets the output voltage at 12, 15, 16, 18, 19, or 20 volts. It actually rates the output on the label at:
12V, 5.4Amax DC
15/16/18/19/20V,
5A-3.75Amax
(That's an exact quote of the label)
I haven't torn it apart because I use it for an ancient laptop, but it also has an auxiliary USB 5V output rated at 2A which is super handy. After watching your video here I'm really tempted to take it apart to figure out the topology.
I've also been goofing around with the little adjustable supply I made the video about modifying awhile back. I'm trying to add a linear regulator to adjust the voltage lower, but I'm waiting on some dual pots in the mail as thats the only way I know of to adjust the switching supply and regulator to track each other without adding an op amp circuit. Any ideas or suggestions are more than welcome :)
BTW, could you put "flyback" in perspective please. I think I understand the basics, like the charge is stored in the core. I got a bit confused after reading that there are continuous and discontinuous types of flyback operation.
I have a hard time putting the different terminologies into perspective for the different switching designs. I think I understand buck/boost/buck-boost, none isolated/off line and those types of basics. I have a hard time understanding what is branding terminology versus topology after that point. I vaguely recall "Switch Mode Power Supply" is a branding term. I came across "Peak Mode" used to describe a controller/topology at some point early on in my exploration of these things. I originally associated that with the simple designs that use a single voltage feedback loop and a current sense resistor like a MC34063 etc. I thought of the dual feedback chips as "PWM" because the first time I saw a chip that was labeled as PWM was when I looked up a TL494. The first time I saw the term "flyback" was in reference to the high voltage transformer used on old CRT televisions, so I thought the design was more high voltage specific. I've realized this is incorrect, but I have a hard time understanding how it fits in to switching DC converter designs over all at this point.
I think someone with a thorough understanding should do a video on an overall abstract explanation of different switching designs that tries to cover 90-95% of the designs used regularly in practice. Maybe they could also explain the basic evolution of things like power mosfets and bjt's as it relates to switching IC designs. I know I hit a learning-wall when I discovered the output current limitations of the MC34063 for myself. I think it is due to the Darlington output design. IIRC I read somewhere that this design was done before power mosfets, and that's why it sucks, but I could be wrong.
Seriously, thanks again for all of your efforts. I recently noticed your website link in a video as well. I bookmarked so many pages I had to make a folder for it.
Very much appreciated,
-Jake
This is the Rhino psu mentioned:
s1160.photobucket.com/user/jakebikereligion/media/20170602_182031_zps24vdy4hq.jpg.html
Greeting from Spain, I'm not able to describe how useful are your videos, thanks a lot
Sir
You are a thorough genius.
You explain very swiftly
I am lucky to have found your channel
Friend. Watch my video!
ua-cam.com/video/2Qr6Jcm8wbA/v-deo.html
I could tell by the thumbnail that this was going to be an excellent explanation of how a switching power supply works.
you are the best teacher I have never ever seen before .
DGW: love your narratives and schematic analysis. I have learned much from your videos.
Ok, but please keep quite. You don’t want to upset his cat.
No One does it Like DiodeGoneWild...
This video benifits me more than a whole semester, thanks.
Excellent as always. I always look forward to a new video from you. Always interesting and entertaining.
The genius you are Man.we love your videos.big salute from algeria
really this is the best video i have ever seen before on youtube , please go ahead for more explanation
well done
I've altered a few 19v laptop power supplies to 13.6v output. One didn't work properly when I reduced the o/p voltage, now I know why! Thanks dude :)
We salute you the way of teaching and explaining, may GOD Bless you.
I would like to encourage you to keep making videos like this periodically. Even though it does not get the views of the simpler ones its important to add proper content.
I made a 5 videos on solar panel hobby project. Though it has very few views I am not daunted. It was really for me to put down all the info in one place and spend the time to consider all angles. I even picked up an error assumption I made in the second video when I did the calculations for the third.
Thanks :) I will definitely keep making such videos ;)
I think this is the best and detailed explanation of a SMP I found so far. Great work 👍
Friend. Watch my video!
ua-cam.com/video/2Qr6Jcm8wbA/v-deo.html
Decided to wait 'till I had time to properly concentrate on this, glad I did. Lots of good info, thanks.
Damn great video. Thank-you-so-much, Dan, for explaining it so clearly. Videos like this are very useful because they're not just simple tutorial telling you how to do something, what to change, what to remove and so... such materials are much more useful. I almost feel how my knowledge and... understanding grows up! Thank you. :) Keep doing this, my man!
Excellent explanation and loud audible English
Absolutely fascinating. A great in-depth and concise explanation on the function of a smps.
I pulled several of these from throw aways and i test them. Its a good way to learn.
Sir I am from India and your explanation is very nice ...i can understand your complete english
Love this guy's voice.
Like singing a song...
If you haven’t yet....it’s time to subscribe. Great , in detail explanations.
Wow awsome lecture, very well explained no detail left out.
A brilliant explanation! And your accent is so cute :)
So much information in one video
You earned a subscriber 👍
I really appreciate your detailed explanation
You are an Electronics Master . Thank you for sharing your knowledge. Keep it up with this type of explanations. My motto is P.S.'s and electronics devices are designed and built from high knowledge people like you, Masters and PHds. Trying to make circuit changes on P.S. can be fire hazard. You guys can see how complex are calculations on semiconductors, I even see more complex equations and simulations. Please do not attempt to change main circuit. If you want you can add external DC-Dc converter.Namaste.
thank you for this video! i look forward to switching supplies videos but i do enjoy all your stuff.
very very informative and excellent narration, thank you very much.
Great explanation.thanks for sharing your knowledge. Your teaching videos help us alot.
Friend. Watch my video!
ua-cam.com/video/2Qr6Jcm8wbA/v-deo.html
This is amaz ing how you explain it. Please do more Videos
Thanks :) more videos are coming...
You could activate the subtitles to be able to follow his impressive explanations. Many thanks.
Awesome video ! Superb description of the circuit !!! Keep posting videos !!! 👍👍👍👍👌👌👌👌👌👌
Thank you sir. Perfect explanation of schematic circuit to design level.
Friend. Watch my video!
ua-cam.com/video/2Qr6Jcm8wbA/v-deo.html
Great video. Waiting for video about half-brigde topology :)
Yes, that would be good. Most ATX PSUs are half bridge.
Ah thanks greatly finally the 5v light came on with regards to something you explained thank you.
Great video - very well explained! Love it! Would be great to hear your take on why the outputs are not at the rated voltages (would this be linked to e.g. bad capacitors?)
I have been binge watching your videos ever since UA-cam recently recommended one of your small power supply videos to me after watching a BigClive video and yesterday and today was spent tearing down every single sketchy Chinese electronics device I have ever purchased!!!! Holy Fuck was there some dangerous USB chargers 🔌 with Class X2 1KV capacitors ACROSS THE MAINS AND IN A SPOT THAT WAS CLEARLY MARKED CY1!!!!!! I’m learning a lot about safety from your Super Sketchy Chinese Device Videos and my favorite part is always the reverse engineering with schematics and extremely in depth explanations of what each piece does and why you’re supposed to be using certain components specifically because of safety!!!!!
Thanks sir.. Clear and accurate explanation..
Loved it!! It was super interesting and informative. I'm subscribing. 👍
Love this channel!!! Cheers from Brazil
Amazing .. best explained on youtube
Excellent tutorial on smps ! Wow
Thank you very much nice mr.what is the use of capacitor between hot ground and cold ground??
This is like a peace therapy for me
In 6:20 the 10r is to limit the current. The -12v goes to the two motors (spindle and optical assembly driver) also this -12v is used to generate sync pulses of the composite video signal. The 470r discharge the capacitor, because some overshoots happens and the peak voltage will charge the capacitor gradually to 13v or more. If you remove this resistor you can check it go beyond 16v sometimes, mainly when the 5v is at full load and the regulator is trying to compensate with a large duty cicle.
Beautiful explaination Hats of to you Thanks
From somaliland i like your clips my friend.thank you.
Everytime i watch this video i learn something more! Really great and very deep explanation of switch mode PSUs in flyback topology!
So thank you very much for this excellent explanation!
I just have one question: why is the voltage per turn different in each polarity? Is it mainly because of different slope steepness when turning on and turning off (transistor/mosfet) as we know the change of current per time is relevant for the induced voltage? Or is it mainly due to the duty cycle as you explained? Or does both relate to each other so that it comes to the same result? Not absolutely sure about this?
Thank you, Very informative. Gives a good understanding on how a SMPS works....
Another power supply tutorial I gotta watch
Best one description.thanks very much
14:03 Why it's adding to 300V? Isn't it shorted out by snubber circuit on primary transformer winding?
Díky moc za vysvětlení! :)
Very very very very outstanding explanation.
20:56 You say the voltage on the diode will be 48v
Is that at the anode or between the anode and the cathode of the diode ?
Is that voltage dc or ac ?
If I could I would give you two thumbs up! Great explanation. Are you planning make some videos about ATX power supply?
I have already made a video about how does an ATX work:
ua-cam.com/video/Cur3nQjjyyo/v-deo.html
And a video about how to repair it:
ua-cam.com/video/HcYFbCqM61g/v-deo.html
Great video! Thanks for posting I learned a lot here.
Tell us how are audio amplifiers ab class works, please! You do a very interesting content. Thank you so much! Inspiring!
This will be a fantastic video. There are so many class d amps from china (smsl, fosi, doux etc.) thier circuits looks something like you can give a good description for people like me who are always interested on how circuits works. And since they are all made in China at least we are all able to know how good thier circuits are built.
Downloading the data sheets for the ICs that are used is a good start. Often the application notes in the data sheets will explain what increasing or decreasing component values around the 'chip' would actually do .
another great video
Great stuff.
I did not understand what circuitry set the OFF voltage to 100V whereas the ON voltage could vary with mains?
Can you make an SMPS design in your future videos? It is not easy to find out core type, which turns are required etc.
This is excellent! The lights are on and there's someone at home...
Thank you so much. I am trying to repair a subwoofer amplifier with switch mode power supply. At least, now I know what the heck is happening!
Very good video Sir...
Very helpful...
U r a great teacher...
Please tell me y capacitor connected between primary and secondary ( blue capacitor)if it is not connected then what will happen
Very good work, keep it up.
Thanks a lot for your excellent explanations .
I Like all your video bro.superb explaination.gave u more thumbs up.
Dane,ukázal bys někdy stavbu malého spínaného zdroje-jak má vypadat trafo,jeho izolace...
Jinak jako vždy pořádný obsah videa.
thank you brother for these educative videos.. Weldon..
Thank u very much for ur valuable video. I have doubt that how could u say when 300 v is on transformer coil then it is 25% duty cycle. Please explain
Wow what a presentation!
Wonderful explanation !
im newbie in electronics, could you explain what's the difference between -12volt, -5volt and ground (0volt)??, what is negative voltage anyway??
You can choose where you put your ground or 0 level voltage. So he could have described the power supply output voltage as
0V (-12V)
+12V (0V)
+17V (+5V)
+24V (+12V)
Or one could add 100V to every level.
In this case it’s probably most convenient to define the 12V section as -12V, 0V, +12V
And the other section just as 0V, 5V.
You could also imagine a positive voltage as a pushing force and a negative voltage as a pulling force if that would help.
eagerly waiting for next tutorial on smps power supply
Great explanation :) Thank you for your effort .Cheers
thank you indeed really thank you, your information is more helpful
EXCELLENT. Nothing more I can say.
Very good explanation
thank you .. i have learned a lot from you ... master
Excellent video. Very informative .
Nice! But why 480p? Not related to that but every time I see a switching power supply I can't help but think of the time when I connected one to 120v AC thinking it would work like a regular linear transformer, boy was I wrong! That was years ago though when I did not know about SMPS's.
It should be 720p. Maybe it is still not processed.
Yep it is now, my mistake :)
ELECTROHAXZ why, what happened when you connected an SMPS to 120 V? it regulated to the nominal output voltage and you thought it would be half?
I guess I said that wrong, I removed the transformer and connected it to 120 volts thinking it was the same kind of transformer as a linear one.
ELECTROHAXZ oh, ok
The fact that the 12V supply is unregulated might be because it is feeding the input of various DC-DC converters as is common on PCs.
It also might only be used for analog audio circuitry in which case they could be further regulating it down to +/-9 or just using op-amps with a very good PSRR.
Sir, which IC is this
Good my friend .l like ur videos .and ur explaine in electronic , ur voice so beautiful . continue
Great explanation.
17:54 Why not +300 v when the transistor is on , and -100v when the transistor is off ?
🙏💓🌾very nice teaching sirji 🌾💓🙏
Lets keep the transformer/copper losses/diode losses out of this, the paper is full lol :-D
No i dont want to know that the output diodes have to be fast recovery otherwise they short the output :)
My brain is exploding lol.
I have kept similar supplys to yours, i just cant throw away a usable switchmode.
I have a dvd player one with mosfets on the outputs for switches, hmm nice.
I need to go to "Switchmode keepers Anonimus" :-D
Even when I try to explain it the most simple way, it is still quite complex :).
lol, now you see why i stick to repairing, too many dam variables.
The concept is easy, but just calculating an ideal transformer requires imaginary magnetic feilds/lines of force/interwinding capacitance and (Thats it, my brain shuts down fully) :-D
You and mr johnnnny seem to make some good psus, they work :-D
Agree here too. MrJohhhnnnyyy and Mr legend Danyk should do an episode together or.. maybe they should each put half of a mystery circuit together on a vero-board and mail it to the other to see how it gets completed.. just for fun! And guys - No cheating!
I have a spreadsheet i developed that calculates all major aspects of several types of power supply :) Look up "Mega SMPS Cheat Sheet" on badcaps.net forum.
Very good description