12V 50A 600W power supply - oscilloscope waveforms

[@TradieTrev]

This crappy PSU you've modded has become a valuable teaching tool! The way you explain it and show us the waveforms is just perfect!

[@stanimir4197]

@Agustinus Reynaldi it has 3v spike, it's very far from 'safe'

[@FlyingShotsman]

This really should be a million-subscriber channel. That was some of the best circuit analysis and demonstration I've ever seen, and it didn't take $20k worth of test equipment to make it happen. Pure gold!

[@electronicengineer]

I totally agree with you. Brings to mind a wise, old saying that goes: "It is not the tools that make the mechanic, rather it is the mechanic that makes the tools". I firmly believe that this saying is true. Fred

[@blackartista]

I realized one thing in this field...the more you teach others the more you grow professionally. I'll keep sharing knowledge with others

[@roseelectronics4582]

Your statement is true for all fields

[@sortofsmarter]

I always thought you had a old chunky oscilloscope, I now realize you have a classic irreplaceable tool that you operate with amazing precision and great ability to demonstrate it..Thanks

[@katsuoto4684]

agree!

[@TeacherBrunoOneil]

is it russian ?

[@t_Gecko]

Can you explain snubber networks in one video please? Love your channel!

[@erikbertram6019]

Sam Ben Yaakov has some very nice videos on that topic

[@AlexanderBukh]

yes, please, saw those mentioned many times, but somehow the function and workings disappear from my memory

[@AlexanderBukh]

@@erikbertram6019 cool, gonna watch, but we also want Diode's take on it

[@LunarHermit]

The slow-mo scope was really cool! Really fascinating to watch the way the wave form moves around so rapidly.

[@MegaSunRise3]

This was really awesome and very interesting... especially that shot in slow motion. Great soviet oscilloscope also.

[@mrnmrn1]

I think it's Latvian, but you're right, Latvia was part of the USSR. So Soviet, but not Russian.

[@g.d.8065]

That pseudo-slowmo idea using aliasing is genius. Seems roughly analogous to equivalent-time sampling.

[@cjjuszczak]

This really is amazing, and i wish more people appreciated it o.O

[@rastapaez3992]

The more the technical quality of this channel improves, the more his particular accent increases. DOUBLE WIN.

[@cjjuszczak]

I've never seen anyone talk about his accent, anyone know what it is, it's really unique !

[@electronicengineer]

@@cjjuszczak I believe that Mr. Danyk (DiodeGoneWild) is from Czechoslovakia. Fred

Videos like this will teach you more about switching mode power supplies than a university course.

[@rastapaez3992]

It actually does. True story.

[@alexloktionoff6833]

Thank you for detailed oscillograms and explanation.

[@kemalkurt5257]

Very informative video, you taught me electronics more than my university professor's. Thanks for your hard work and nice explanations.

[@adriansdigitalbasement]

Such a great video series! I would love it if one day you could focus on the various ways these SMPS units do feedback, showing the signals and waveforms for that. (Going back to the magnetic coupled feedback on early SMPSs)

[@smeezekitty]

Its amazing how many of my favorite youtubers watch eachother

[@hernancoronel]

LOL, lately I have been consuming a lot of Adrian’s content and a lot of Diode as well with some of Noel’s retro lab and Marco Reps. They are definitely my favorite KZbinrs by far! Keep up the great content!

[@astrazenica7783]

Very well explained, best explanation I've found here on KZbin. I am trying to learn electronics

[@stanimir4197]

An excellent take, major props. The output ripple is actually worse than I'd have though. One more video, replacing the caps with low ESL/ESR ones..

[@hernancoronel]

It is an awesome idea to measure the transformers with simple half a turn or a full turn of a piece of cable. I am always scared to measure with my oscilloscope directly fearing I may oversee some isolation and blow it up, using those wires it is almost impossible to blow it up. Thank you for another great video Diode!

[@JasonRobards2]

Wow. What a demonstration! This sets a whole new standard for this kind of videos. You seem to show every functional detail of the circuit. I especially liked the slow mo footage of the sliding transient voltages. It goes a little over my head what I'm doing as a electronics enthousiast, but it's nice to know there is a full explanation that's easy to follow.

[@robson6285]

WoW this is superinteressting! Great to see the scope while following the explaining. Super clear and usefull

[@DrHouse-zs9eb]

I love your old oscilloscope!

[@XarkoCZ]

You mean the PROPER oscilloscope.

[@2001pulsar]

Awesome. It's good to see all that in action.

[@ayyadew]

I love those slow mo shots

[@gregorymccoy6797]

I like how you made sensing wires using inductance. Good technique.

[@godfreypoon5148]

I think they were actually copper, not henrys.

[@englishrupe01]

Fantastic analysis and footage....thank you!

[@valdisblack1541]

15:30 this looks f* AWESOME!!!

[@AlexanderBukh]

indeed, bruh

[@AlexanderBukh]

a very fine example why analog still matters, i was a long time a fan of CRTs, when lcds were used all around, don't care of the space, weight and power, as long it showed me a bit more ground truth

[@AlexanderBukh]

now i have 2 4k IPSs, 60 and 144hz and am not a fan of crts anymore, but the place in my heart is always there for them

[@159357ahmed]

still waiting for the explanation and schematics for this power supply , thanks man love your vidoes

[@isettech]

Many smaller supplies have only one diode in this configuration. The diode conducts only right after the transistor turns off. This current is monitored and is used for short circuit protection. If there is a short, the switching transistor only sees the current feeding the inductor, then higher current on the diode due to the lower output voltage is sensed when the transistor is off and the duty cycle reduced to a safe level. Many people starting to service switch mode power supplies realize that most conduct the output diode when the switching transistor is off. This is for protection from short circuits.

[@johnoddvar1967]

Thanks for an exelent Video. I have learned so much from you about switching powersupplys.

[@Paxmax]

Very cool waveforms, very nice filming, turned out amazing!

[@willrobbinson]

fantastic overview of operation , you have taken some time to get these "cro" shots ect , alot would not realize the time to do so , thanx so much for these vids ect

[@rtyzxc]

I didn't understand half of this one but it's relaxing to watch before going to sleep. Also, nice camera flex with the high frame rate.

[@AllLoudNation365]

15:13 This has to be the best scope measurement I have ever seen.

[@diyordie7431]

Slow motion shots are nice :)

[@AmatorElektronik]

Nice video. Best from Poland

[@singhpk99]

Excellent analysis! Fantastic!

[@Miata822]

Good video, clever use of the camera to get that amazing slow motion.

[@lakiza55]

Great video. Would be nice to see how you'd improve the output ripple. Like replacing or adding more capacitors or an additional filter stage.

[@LMB222]

He did it before, partially.

[@jp040759]

That was a great video. Really cool to see what is actually going on in a SMPS.

[@mac91077]

You are great in your field of work. Much appreciate your knowledge.

[@randydicotti3975]

These videos are priceless. Thank you !!

[@ahmadkadahsalim5048]

I don't know, how many times I will appreciate you for this explanation so Miga Respect . I would say 🔊 U R the King

[@orpedsesama]

Amazing!!! Makes me wanna use oscilloscope more!

[@rectificadoresfaraday1943]

Dan, you are a great professor....and by the way these such a eussian oscilloscope is wonderfull...

[@piconano]

Beautiful video.

[@saarike]

Excellent video! Thanks a lot. 👍

[@wouter11234]

"Mom can I get a new heatsink for my lamp?" -me "No, we have heatsinks at home!" -mum Heatsinks at home: 0:20 top left

[@FaysalKhalashi]

😁😁

[@LMB222]

Hi Danik, we've seen that you've got less material to show, so I second the opinion that some theory, like snubber networks, would be great. You have a good command of electronics, so I trust you'd make an excellent example with actual parts. Good luck with your channel!

[@vianacode]

Awesome explained!

[@arvinbaba]

Try to measure output voltage overshots by connecting tip and ground of your scop together and put it on negative of output voltage, you can see the spikes on any place of negative with this method!!!

[@petrhawliczek3302]

Woow the aliasing slow motion is perfect! Slow motion without slowmotion camera - You are genius!

[@SINHRO-FAZA]

Простенький советский осциллограф даст прикурить нынешним новомодным и дорогим цифровым, с такой то частотой отображении сигнала на экране.И ещё на удивление отличная синхронизация сигнала.

[@sklepa]

You're The Best SMPS teacher I've ever had. You make me look on this topic from other perspective. Thank You! Have You seen prices of server power supplies? They can be bought from 100Kć and they seem to be not dodgy at all! And they also seem quite complicated. Maybe some video in future? Now Im modding one made by dell to use it to power hydraulic car lift :)

[@EngineeringAllAround]

2:00 It's a full turn on a half of the magnetic flux!

[@TechGorilla1987]

So, lets take a look at it....and my cat of course...

[@Tirdad1981]

Fantastic Video! Thank you.

[@ProdigalPorcupine]

Dan- Hello from England, great video as always! You’re easily one of my favourite KZbinrs, you have a unique way of communicating with your audience, and you have a real talent of passing on your highly impressive skills that instantly hooks the viewer. I hope you don’t mind me asking - Is your day job electronics related? I’m also curious about that wonderful Soviet scope. Do you know its vintage, what its bandwidth is, and.... would you ever consider doing a bit of a teardown on it? I can’t be the only one who would love to see this, Soviet era electronics is so fascinating. Thanks for the great videos, please never stop! - Dave

[@Gengh13]

That fake slowmo footage was really good, could you have achieved a similar (maybe worse) effect, but easier by setting the trigger holdoff to something a little over 10ms, so you sample different parts of the 100hz variation in each successive capture?

[@MuhammadDaudkhanTV100]

Great

[@amrstaha]

Very informative. Thanks alot

[@fullbridgeelectric]

Please what is the type of that pocket oscilloscope? Thanks

[@billwest257]

Regarding the high frequency ringing noise on the output signal, could that be ground bounce? What happens when you connect the probe tip to the same ground used to make the measurements shown? I bet you still have the ringing. Remove the long ground clip lead and probe clip, wrap a piece of wire around the probe tip ground to form a short ground lead. More than likely the amplitude will be much less with same low frequency ripple amplitude.

[@raffaellobottoni871]

Generally the ground loops introduce noise, but in this case it seems to me that it is due to the filter coil being saturated, the diameter of the wire seems too small for the current involved, and also as regards the poor quality electrolytic capacitors to remove those high frequency rings and improve the ESR, it is better to put ceramic capacitors of a few hundred pf at the ends of each capacitor. It would be better to redesign the printout with a double-sided design, precisely to obtain a clean and low-noise output voltage. But all these design subtleties, for such a low-priced power supply, I don't think the manufacturer has ever thought about it. However my most sincere congratulations to Diode, exhaustive and detailed exposition as always!

[@MuhammadDaudkhanTV100]

Awesome arts

[@Tiyagi99]

Can you please tell the model of your scope I want to buy one.

[@zilog357]

Same here. I liked the scope. Would love to know make and model.

[@katsuoto4684]

I'm also interested in Soviet portable scope C1-118A analog oscilloscope!

[@martinbobak3009]

Will you make vttc series?

[@omsingharjit]

Why there is no Microwave Oven powered by Smps high voltage efficiently ??

[@JayPeeEV]

Best Electronics teacher and comedian.....love your videos and your cat.

[@collinsmwaura1833]

Great video 😲😲

[@dktr2]

Awesome.

[@celsoneves2368]

Top show!.

[@Electronic_For_You]

Diodegonewild Please make video on class AB amplifier

[@stephanc7192]

Great video

[@MC-01]

Can you make a video about on calculating the transformer

[@Basement-Science]

Damn, that fake-slow-mo was awesome. That combination definitely beats a digital scope on its own for stuff like this! It shows how the duty cycle slowly increases as the capacitors discharge and then quickly goes back down at the peak of the AC input. How else can you even show the varying speed of the duty cycle changes in an intuitive way? Do any digital scopes come with a slow-mo replay mode?

[@Gengh13]

My rtb2004 is not particularly fast (maybe in a keysight scope you can see it clearly), but in the history mode you can replay your captures at different speeds, so I'm pretty sure you can do something similar. If you don't have that option I guess you can set the trigger holdoff to a little more than the 100hz of the variation to get a slowly moving waveform, you essentially sample a different part of the 100hz cycle in every trigger. Another alternative is to trigger on different levels of the input capacitor voltage, by moving the trigger level you can see the changes in the waveform.

[@Basement-Science]

@@Gengh13 Mx Hantek DSO4072c has so little sample memory (only 40K) that there is no chance of recording anywhere near enough points to do any kind of slow-mo. Yeah maybe you could do it with tons of memory. Trigger holdoff might be an option, but you're still limited to the refresh rate of your scope and it's gonna be just as fiddly to set up as on the analog scope. Just triggering on the filter capacitors doesnt give you the time aspect of it though. You could look at all the waveforms in the cycle, but wont get an idea of how fast they change into each other. Of course you cant do any of this with just an analog scope either. You need a half-decent camera for it as well.

[@jayvadgama7076]

Why they dont use iron core in transformer??

[@brucel.6078]

Super genius!!!!!!

[@SamSpiri]

Extatic videos

[@pirelli77]

thanks DGW, another awesome video and very interesting!! 😊🔋🔌💡🔦💻 ⌨️

[@BIGRIP87]

nice oscilloscope

[@sumitmamoria]

Great video. Is is possible to try and see simultaneous wave-forms for voltage across the switch and current flowing through it? That could give some visual estimate of power losses.

[@suleymanardc9806]

Thank you very much , very good

[@visiskasniekas4523]

Why dont you float your 2 channel scope? Basically i have an extension cord and i removed the ground contacts on a few sockets and i plug my scope in those when measuring mains stuff. On my scope its very unsafe because the scope body is mostly metal, but with your scope its pretty safe to do this (mostly plastic).

[@arvinbaba]

could you plz show us how to remove or decrease 25mhz overshot spikes ? Actually in most PC power supply is 2 switch forward and 80% of them have this spikes which is not good for mainboard healthy. REGARDS

[@simontay4851]

A lot are half bridge actually. A snubber on the output diodes and an additional output inductor would help

[@arvinbaba]

@@simontay4851 I think the EMI could be high.

[@Zebra_Paw]

It is possible to run your big oscilloscope without the ground. Just build a ground defeating extension... It's the only case where you can use it of course, otherwise it is very dangerous

[@cekpi7]

Or get isolation transformer, you don't need big one since oscopes aren't drawing that much power.

[@Zebra_Paw]

@@cekpi7 great idea. I was going to say that the power supply is 600W so the transformer would be crazy big, heavy and mostly expensive, but using it with the scope is brillant. Still you have to disconnect the ground from it but since it is powered via an isolation transformer it is not needed anymore.

[@eDoc2020]

@@cekpi7 There would be no gain by running the scope on an isolation transformer because its internal supply will be a regular isolated step-down transformer. Either way if you defeat its ground and hook it to the DUT's high voltage supply it will raise the oscilloscope's chassis to dangerous voltages relative to earth ground. It's one thing to do that with a small plastic-cased battery scope but I would definitely not want to do that with a large metal-cased oscilloscope because the shock risk is greater.

[@nikiamz6501]

You should make a video about the power adapter from the pirl charger video...

[@kyoudaiken]

Would it be possible to quench the ripple with multi layer ceramic capacitors?

[@tomkirkgaard247]

Even though the battery oscilloscope is isolated, I would worry about the break down voltage of the membrane buttons. Maybe it would be safer to press them with a plastic isolated rod.

[@DiodeGoneWild]

The buttons look like this from the inside: kzbin.info/www/bejne/nXSsYYZpd8iinMU not membrane buttons, but microswitches with several milimeters long plastic rods. It makes it a bit safer.

[@AlbertoPiscitelli_Music]

Fantastic

[@martinmendan9683]

Great, you are the best. I have 42v, 600w SMPS. Two current sensing resistors 0R18 damaged. What can it be?

[@two_number_nines]

this thing with better output filtration would make for a great secondary power supply to upgrade computers with high power gpus.

[@Conservator.]

15:23 This is epic!

[@ladislavdoubek4872]

Thank you, great video. Have you got a new oscilloscope? I think you had a c1-118 without A (to 10 MHz). A have this one with A too, but i dont know, what does the button on the right of button Y1 (it is something with arrows). Have you got it with classic GND pin on the plug, because i haven't? Thank you very much for the answer.

[@DiodeGoneWild]

I have both C1-118 and C1-118A. The button switches the modes of the 2-channel operation between chop and alternate. Chop switches very quickly between the channels (sometimes you can notice that the lines are made of tiny dots). Alternate mode alternates between the two traces. It draws one trace, then the other one, and so on. Alternate is better for most cases as it creates less artifacts. Chop is good to show low frequency waveforms because alternate halves the refresh rate and so it flickers more when measuring low frequencies. My oscilloscopes have a grounded mains plug, universal european one.

[@ladislavdoubek4872]

Thank you very much. The last question is, what plug (jumps winding of the transformer) you have behind the ,,door" at the bottom. It is where is connected the feeding (power) cable. (Omlouvám se předem za lámanou angličtinu. Důvod proč bych chtěl vědět jakou máte propojku vinutí je ten, že bych chtěl osciloskop připojit na vinutí na 240 V, dle návodu by to mělo být možné, ale nemám originální propojku ani vinutí nejsou popsána.) Thank you.

[@legomachines5970]

2:55 the core of the transformer moved!

[@TheLightningStalker]

I wonder how difficult it would be to get such a PSU to output constant current mode for short pulses at higher current.

[@edgeeffect]

Whenever you get your осциллоскоп out... I get sidetracked from what you're talking about because I'm trying to read the Cyrillic. I have to keep rewinding! ;)

[@AlexanderBukh]

haha, same, не совсем, but still

[@ProdigalPorcupine]

I love the little ‘Sdyelano v SSSR’ badge! I taught myself to read the Cyrillic script (which I absolutely love) when I was about 12 years old, and that’s 42 years ago, so I hope that’s right, lol! I’m a bit rusty now. I don’t understand Russian, though. I’m guessing it means ‘Made in USSR’?

[@edgeeffect]

Я только немного понимаю.

[@ProdigalPorcupine]

@@edgeeffect - I understand almost nothing except hello, thank you, etc. lol! I really wanted to learn as a kid, but there wasn't enough interest at my school. I would probably have struggled anyway, I couldn't even get to grips with German!

[@matthew1333]

Hi I have poor understanding for switching power supply , can someone explain to me where to get the control circuit to drive the mosfet on and off ?

[@kowaldrums]

Is this way for calculating transformer ratio will be correct in case of flyback? In ex. this orico charger from previous video : kzbin.info/www/bejne/oJWshKGirsmIg80 320 * ( 10/138) = ~23,1V, even including voltage drop from diode it seems high and that charger doesn't have an output inductor. What I'm missing?

[@shayhsopwagqehghggtfyggty2635]

Is the transformer an 220V changer or 24V changer to 12V??

[@wearethewatt2950]

You probably have a lot less actual output overshoot. Use proper RF probe grounding with a ground spring instead of the long ground lead.

[@Agent24Electronics]

That's what I was thinking. I would be interested to see if there's any difference with a shorter ground connection.

[@4000578]

The "horrible 3V ripple" is almost certainly the ground lead pickup on your scope. Try a low inductance "spring-clip" ground lead and it will go away. The loop area of a regular 10:1 probe ground lead makes it not useful for any PSU ripple measurements. Also don't forget you need to have a 20MHz BW limit on scope to measure ripple in a standard way.

[@Felix2417425]

What would happen if we remove output inductor, so that there only capacitors on the output? Will output voltage increase significantly?

[@DiodeGoneWild]

You'd get about 50V with mains ripple and no regulation, no inrush limitation...

[@Felix2417425]

@@DiodeGoneWild Thank you for fast reply! So is output inductor absolutely mandatory in half bridge and forward toplogies? I understand that ripple will be increased without inductor, but I don't get why there will be NO regulation? And what it has to do with inrush limitation? Isn't inrush limitation at the primary side? Or you mean that the output inductor will limit sudden increase in load? Sorry for asking too much, but can you make in the future video with experiment with taken-out output inductor and explain what is happening then? Just a suggestion. Regards!