12V 50A 600W power supply - failure analysis & transformer autopsy

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DiodeGoneWild

DiodeGoneWild

Күн бұрын

Пікірлер: 344
@gillywild
@gillywild 3 жыл бұрын
This is massively useful content :) I don't think there is anywhere else you will see such a well done practical analysis of smps's. I've worked with many engineers who could write a board full of formulas about power supplies but couldn't repair one if their life depended on it. This sort of practical knowledge is rare and getting rarer. A massive thank you to Diode for these videos.
@rjones8508
@rjones8508 3 жыл бұрын
Absolutely true
@richardnanis
@richardnanis 3 жыл бұрын
I couldn't say it any better! Thumbs up for DGW!
@A6D6E6
@A6D6E6 3 жыл бұрын
Spot on ..........
@batkotivalio
@batkotivalio 3 жыл бұрын
Absolutely agree!
@naseemqureshi1966
@naseemqureshi1966 Жыл бұрын
Absolutely 💯 right 👍. My well wishes to Gentleman 💗
@BogdanSerban
@BogdanSerban 3 жыл бұрын
To rule out secondary side shortcircuits it's useful to plug a bench power supply at the outputs and see if there's any abnormal current draw. This can also be done at the input but a higher voltage is needed (above 40-60V DC). BTW these SMPS videos are absolute goldmine, I have the same ESR meter but it never occured to me that I can test transformers with it. I'm now trying to build a TSWF power supply.
@keithking1985
@keithking1985 3 жыл бұрын
thats a great tip you shared there. thank you Bogdan : )
@jeffm2787
@jeffm2787 3 жыл бұрын
Would love to see that back in operation with a hand wound transformer with copper wire used. Bit of a pain I known, but would be nice.
@ithalkomedi1513
@ithalkomedi1513 3 жыл бұрын
+
@giovinis
@giovinis 3 жыл бұрын
i have being dreaming with that day since i born
@tigerelectronics5966
@tigerelectronics5966 3 жыл бұрын
Hell yeah!
@krisd1000
@krisd1000 3 жыл бұрын
He did
@jeffm2787
@jeffm2787 3 жыл бұрын
@@krisd1000 Yes, I watched the video moments after he released it.
@Conservator.
@Conservator. 3 жыл бұрын
1:20 They must have used a very high quality fuse that could withstand a 25A current! 🤣 Thank you for yet another very interesting and excellent video!
@abeleski
@abeleski 3 жыл бұрын
Thank you. Would be nice to inspect the fuse and see how many amps it takes to blow it up. Its probably a fake fuse too.
@patriotinontourlive3854
@patriotinontourlive3854 3 жыл бұрын
I think, they used some pice of the primary winding - solid aluminium is best for 25A ! :O)
@michamaecki8104
@michamaecki8104 3 жыл бұрын
That's possible - i've encountered similar situations in high-end power supplies. These fuses are just slower than good circuit breaker.
@Conservator.
@Conservator. 3 жыл бұрын
@@michamaecki8104 The 600W power supply tripped a 25A 230V circuit breaker (5750W) and it took a few seconds. 🤔
@michamaecki8104
@michamaecki8104 3 жыл бұрын
@@Conservator. Yes, because fault initially didn't blew up transistor, that shorted mains. First transformer failed, and after 5s transistor and diode. Also, circuit breakers have solenoid that trips breaker at huge current surge much faster than ordinary fuse, so it's common to see power supplies with blown transistors and fuse intact. Also, to trip standard "B" circuit breaker in 5s, ti would need to see something around 75A.
@DrBeat-zs9eb
@DrBeat-zs9eb 3 жыл бұрын
Would love to see a repair of the power supply with explanation how to choose the right (real copper this time) wire for the transformer.
@vaclavtrpisovsky
@vaclavtrpisovsky 3 жыл бұрын
DiodeGoneWild's birthday is in three days!
@jayvadgama7076
@jayvadgama7076 3 жыл бұрын
😃😃and my on 18th...
@csala05
@csala05 3 жыл бұрын
Tak že, dopredu všetko najlepšie majstre. 😀
@Purple431
@Purple431 3 жыл бұрын
Mine in may 5 2007.
@Random_4400
@Random_4400 3 жыл бұрын
How do you know 🤔
@Random_4400
@Random_4400 3 жыл бұрын
@@Purple431 mine may 13 2005
@yodamaw
@yodamaw 3 жыл бұрын
Wind a new transformer to show how a good transformer should be winded.
@MrHD71
@MrHD71 3 жыл бұрын
yes
@carlos_f
@carlos_f 3 жыл бұрын
yes please
@lunaticsterritory8868
@lunaticsterritory8868 3 жыл бұрын
Yaaap
@0124akash
@0124akash 3 жыл бұрын
Yes
@philippezhang
@philippezhang 3 жыл бұрын
PLEASE
@Ariel-mq1pg
@Ariel-mq1pg 3 жыл бұрын
i would love to see this working with rewinded chopper transformer.
@BobT36
@BobT36 3 жыл бұрын
This sort of vid should ABSOLUTELY be shown in electronics schools. Good job mate. As an electronics numpty I love your vids anyway, but I can really see the educational value here.
@piconano
@piconano 3 жыл бұрын
Now that's a nice SMPS video. I didn't think they would cheat even on the copper wire! I was wrong again. From the output rating to the parts used, all the cheapest possible.
@acoustic61
@acoustic61 Жыл бұрын
Informative video. He may be the most resourceful technical person I've seen. And the dim bulb tester is a great tool to observe the power cycling.
@xavierm.3414
@xavierm.3414 3 жыл бұрын
Since there were no shortage in the primary side, I would have tried the power supply without any current-limiting bulb, just in case the SMPS controller was disturbed by the voltage drop across the bulb. But you were 100% right, the transformer was faulty. Also, nice trick to test the bridge rectifier directly through the power cord. Very good explanation video
@emmanuelvallee5386
@emmanuelvallee5386 3 жыл бұрын
The SMPS controller only need a small voltage and current and DGW suspected the primary side of the transformer to be shorted and didn't want to fry again the chopper transistor and the diode again and therefore used a current limitation bulb
@xavierm.3414
@xavierm.3414 3 жыл бұрын
@@emmanuelvallee5386 lol tu es là toi !! excellent
@naseemqureshi1966
@naseemqureshi1966 Жыл бұрын
Thanks my friend for sacrificing your power supply and explaining the fault.❤
@ramingo.craftsman
@ramingo.craftsman Жыл бұрын
I'm learning a lot thanks to your tutorials
@jms019
@jms019 3 жыл бұрын
One thing you said has me thinking. That a flyback design has an air-gapped transformer. My understanding is that it allows more energy to be stored for a given size (amount of core iron) and the nature of flybacks requires more energy storage. This is what I like about this chammel. Despite decades of experience there's always something new to learn
@esunayg
@esunayg 3 жыл бұрын
no fix :/ I would be verry happy to see you rewind it with old copper wires :D, as always, good video dgw!
@ithalkomedi1513
@ithalkomedi1513 3 жыл бұрын
+
@noelj62
@noelj62 3 жыл бұрын
Very very valuable information. Thank you.
@puyansude
@puyansude 3 жыл бұрын
I am always impressed by your deep knowledge of the principles of fundamental electronics. Great work 👍👍👍
@lwiswrangnarzary9377
@lwiswrangnarzary9377 3 жыл бұрын
Very good knowledge of electronics
@subhobroto
@subhobroto 3 жыл бұрын
Great video! If over the next few episodes you can walk us through transformer design, winding, testing, that would be extremely appreciated and valuable. Upvoted
@idea-shack
@idea-shack 3 жыл бұрын
Really wanted to see you rewind the transformer properly and then re-test it at 50A!
@omaralkassab9079
@omaralkassab9079 3 жыл бұрын
Thank you dear for your great SMPS videos, I learned a lot of information about them... I can’t wait the reverse engineered schematic of it
@brucel.6078
@brucel.6078 3 жыл бұрын
Very genius!!! Amazing the things I learn here. And I like your cat, of course.
@SONYSony-em8dt
@SONYSony-em8dt Ай бұрын
WOW i am amazed by your knowledge of electronics
@NullPointer
@NullPointer 3 жыл бұрын
I was about to ask if you have any videos about air gaps in transformers, but then i reached the end and got an excellent explanation! Great video!
@Alexelectricalengineering
@Alexelectricalengineering 3 жыл бұрын
Will you fix it, I mean make a new transformer?
@ithalkomedi1513
@ithalkomedi1513 3 жыл бұрын
+
@catalinbadalan4463
@catalinbadalan4463 3 жыл бұрын
When you click the "like" button on a video before even seeing it, it's when you hit gold...
@jenda386
@jenda386 3 жыл бұрын
It seems like the usual curse of cheap Chinese products: passable design, horrible execution. Had they used a transformer with copper windings and slightly better input caps (better meaning not smashed to smithereens in this case), odds are that the PSU could have worked for years.
@jms019
@jms019 3 жыл бұрын
or given it a realistic rating
@andreasu.3546
@andreasu.3546 3 жыл бұрын
Passable design probably copied from other vendor's product.
@jms019
@jms019 3 жыл бұрын
Which is the ongoing problem with Chinese products
@smeezekitty
@smeezekitty 3 жыл бұрын
@@jms019 I'm sure this was a 25-30A power supply they stuck a "50A" label on
@two_number_nines
@two_number_nines 3 жыл бұрын
now a tutorial on its driver chip please. this is top 3 best electronics tutorial channels
@ricardoelectronicsrepair
@ricardoelectronicsrepair 3 жыл бұрын
other comments: please build another transformer for this psu me: please build another transformer for this psu diodegonewild: schematic first
@ithalkomedi1513
@ithalkomedi1513 3 жыл бұрын
+
@neerajsinghkaira4524
@neerajsinghkaira4524 3 жыл бұрын
Please wind the transformer.. the supply needs it
@ithalkomedi1513
@ithalkomedi1513 3 жыл бұрын
+
@josephe3697
@josephe3697 3 жыл бұрын
DGW is a clever, knowledgeable man !
@Conservator.
@Conservator. 3 жыл бұрын
DiodeGoneWild Happy birthday!
@DiodeGoneWild
@DiodeGoneWild 3 жыл бұрын
Thanks :) How did you know?
@Conservator.
@Conservator. 3 жыл бұрын
@@DiodeGoneWild 😁 Someone commented that three days ago. I hope you’ll have a wondered day! (That someone was Václav Trpišovsky)
@marhoily
@marhoily 3 жыл бұрын
I'm sure I'm not the first one to say it, but you have an absolutely captivating accent ;) Thought you an Indian at first. Awesome videos, keep it on!
@madanpatil1578
@madanpatil1578 3 жыл бұрын
Highly informative and important to us this knowledge about smps transformers.
@noakeswalker
@noakeswalker 3 жыл бұрын
Great analysis DGW ! Those impedance tests and demos really are educational :o)
@akshaykumarvyas
@akshaykumarvyas 3 жыл бұрын
Very educational video. You've made a huge effort. Thank you
@Orthosonic
@Orthosonic 3 жыл бұрын
Love your accent... and content is absolutely top notch!!!
@N0G0MAIL
@N0G0MAIL 3 жыл бұрын
Excellent review as always.
@adaniel69
@adaniel69 3 жыл бұрын
please build a transformer for this power supply in order to make it work again! thanks
@ithalkomedi1513
@ithalkomedi1513 3 жыл бұрын
+
@lakiza55
@lakiza55 3 жыл бұрын
Weird how the primary OCP didn't prevent the obliteration of the diode and transistor, but works fine once you replaced the blown components and just the transformer primary shorted.
@DiodeGoneWild
@DiodeGoneWild 3 жыл бұрын
I think that the transistors and diodes would fail again if I left it on a bit longer... The overcurrent protection has a certain delay and with a very little impedance in the primary, the current rises very steeply when the transistors turn on. And the diodes have no heatsink, so they tend to overheat before the transistors do.
@SeanBZA
@SeanBZA 3 жыл бұрын
@@DiodeGoneWild Typically the OCP circuit has a RC circuit on the input, to handle switching on transients that might cause premature switch off, so the current at turn on can rise fairly high, probably well past the SOA ratings of the transistors and diodes, with the shorted transformer. The overcurrent protection is there to normally handlke shorted output, where it will be transformed to a rising current in the primary, and also as cycle termination in normal operation, so it only has to be really operating near the end of the conduction cycle. Shorted primary the current rises very fast, and the turn off only occurs after the RC delay, so current is going to be limited only by ESR of the capacitors and the on state resistance of the MOSFETS, the dodgy capacitors here might ironically have enabled it to survive, as ERS would have been in the tens of ohms, limiting current pulses, though the output voltage would certainly not have been 12V at full load, dropping to whatever the capacitors allowed, with a very high mains ripple component as well. Diodes might not have failed, but the capacitors would definitely have gone boom and given a confetti shower.
@davidwang_music
@davidwang_music 3 жыл бұрын
After watching a lot of your videos encountering doggy components and constructions, I decided to open my 48V 10A power supply and it turns out to be a BJT half bridge. However, my power supply is welly assembled, with no doggy components, and the semiconductors are mounted properly with heatsink compound. Unfortunately, I found out that the snubber resistors next to the secondary side diode are getting burning hot, so I replaced them with higher power ones and replaced output smoothing capacitors with low ESR ones. The only thing I found doggy was that they completely bypassed the inrush NTC thermistor...
@Purple431
@Purple431 3 жыл бұрын
I like your makeshift thermometer :)
@ProdigalPorcupine
@ProdigalPorcupine 3 жыл бұрын
Great video! Aluminium wire is the devil's work. Microwave oven transformers are wound with aluminium as well, but they don't even use copper plated wire. They use copper coloured varnish to make it look like copper wire.
@Graham-ce2yk
@Graham-ce2yk 3 жыл бұрын
I'd also like to see you repair it with a rewound transformer. It's a great opportunity to explain how to design one for a specific job. I hope the schematic explains what the missing components marked on the board are.
@radiotvrepair1059
@radiotvrepair1059 3 жыл бұрын
Thanks for this vedio. why the impedance is high with a frequency of 100khz delivered by your esr meter
@PiotrK2022
@PiotrK2022 Жыл бұрын
@DiodeGoneWild It is normal, wires may be stucked together. Why? Because SMPS transformers are winded and covered with insulation lackquer, just like classic, 50Hz, one... I disassembled good EI-33 transformer, and windings were also together and I noticed lacquer residue...
@BIGRIP87
@BIGRIP87 3 жыл бұрын
hello, can please make a dedicated video on smps transformer designing? because you explain it very well and i liked your video
@lunaticsterritory8868
@lunaticsterritory8868 3 жыл бұрын
U should rewind the transformer and fix the dojy cheap chinese power supply...this will be interesting😊
@electronic7979
@electronic7979 3 жыл бұрын
Very helpful video 👍
@robson6285
@robson6285 3 жыл бұрын
The explaining i look forward for! That forward switching is not totally clear to me. And you can abnormally good and clear explain such things. (Like that second outputdiode that works together whit that outputinductor, you made it totally clear to understand in just one sentence!)
@brucel.6078
@brucel.6078 3 жыл бұрын
HAPPY BIRTHDAY!!!!
@kna60
@kna60 3 жыл бұрын
Very nice analysis and explanations, thank you very much !
@sup3rbird
@sup3rbird 3 жыл бұрын
Very interesting and informative presentation. Lovely cat.
@milandjukic88
@milandjukic88 3 жыл бұрын
So enjoyable to watch 😊
@michaelfisher9671
@michaelfisher9671 3 жыл бұрын
Thanks Dany very interesting
@raffyturc
@raffyturc 3 жыл бұрын
and just because of an aluminum 'copper' wire, that the design failed. too bad. thats why im a bit skeptical about these cheap high power switchmodes
@Basement-Science
@Basement-Science 3 жыл бұрын
I wouldn't say it would have been fine with the same diameter copper wire. The copper coating actually helps more than you may think because in a HF transformer the skin effect causes most of the current to run in the outer layer anyway, so not as much current wants to flow inside the aluminium anyway. So it depends on the thickness of the copper coating and of course the frequency how much better pure copper would be.
@mitropoulosilias
@mitropoulosilias 2 жыл бұрын
well explained!! a thermal camera (flir) really helps on these troubleshootings but it is very expensive..
@sortofsmarter
@sortofsmarter 3 жыл бұрын
wow, that was great I never would have suspected aluminum wires in the transformer... I have a old 60A bench top power supply from 1950's that has a huge 10 inch transformer in it that uses aluminum wires but that was due to copper shortage because of the war. if I leave it on for long times it will get warm with no load...
@xicath
@xicath 3 жыл бұрын
interesting! maybe some capacitor or diode has been expire thats why its get hotter
@Geniusinventor
@Geniusinventor 3 жыл бұрын
More power supply videos please I love them 😘😘🤩
@filenotfound__3871
@filenotfound__3871 2 жыл бұрын
You should load test more power supplies.
@NickProcktor
@NickProcktor 3 жыл бұрын
Imteresting video. I’m surprised nothing more than the mosfet and diode failed after the transformer shorted. It would be good to see if you can re-wimd the transformer with properr copper wire and see how much better the performance is, you just need to find a new bobbin. After that you’ll have a useful worrking power supply to use for something else.
@sayyidsahal4533
@sayyidsahal4533 3 жыл бұрын
First I downloaded the video and watched it. Now I came back to comment you should rewind the transformer. Only a few numbers turn so it will be much easier.
@jesterraj
@jesterraj 3 жыл бұрын
Was intresting to see you using a esr meter to check the transformer.. what do you lookfor when usin this method...i have this same meter
@zx8401ztv
@zx8401ztv 3 жыл бұрын
Aluminium windings, what a con :-( I didn't expect that. Your cat would make a better supply :-D
@SeanBZA
@SeanBZA 3 жыл бұрын
CCA wire is now so common in Chinese products that getting something without it is very rare now. They make it thinner and thinner, I suspect we will soon see all wire coming out from there in products being CCA wire soon, from power cables to the magnetics, with the only copper being PCB traces. The plugs and sockets they supply are getting thinner and thinner, with the metal content being reduced every year, and soon they will probably be going to copper or nickel plated steel for contacts in all products.
@zx8401ztv
@zx8401ztv 3 жыл бұрын
@@SeanBZA I had noticed mains power cables using coated aluminium but if the use is light at 240 volts it won't make a massive difference. It looks like we will all have to hoard real mains cables, ok i do anyway lol. I bet you have a few hanging around from previous computers and such.
@florind.5711
@florind.5711 3 жыл бұрын
@@SeanBZA Tehnics uses CCAW on speakers for at least 20yrs
@stephanc7192
@stephanc7192 3 жыл бұрын
Great series!
@albertjansen5996
@albertjansen5996 3 жыл бұрын
Would be nice to make a video with this restored transformer. Of couse with real copper windings. ;)
@ithalkomedi1513
@ithalkomedi1513 3 жыл бұрын
+
@Chuckiele
@Chuckiele 3 жыл бұрын
As the core of the transformer survived your disassembly, maybe you could rewind it with copper wire and see if the rest of the board still works? Besides the salvaged parts, poor assembly and aluminium wires, it seemed to be a decent power supply, just not 600W.
@stanimir4197
@stanimir4197 3 жыл бұрын
>decent power supply no thermal protection, no viable over current protection either (unknown voltage ripple - 4 caps on the secondary, tiny coil - for reference meanwell 12V/15A has 6 rubycon caps on the secondary). It's trash bin material - running even 30A w/o over temperature protection is just dumb
@Chuckiele
@Chuckiele 3 жыл бұрын
@@stanimir4197 I obviously would never use it unattended. I never said its good, its not good at all, but its decent for a very low price. Its usable and cheap (I hope)
@stanimir4197
@stanimir4197 3 жыл бұрын
@@Chuckiele My point is that likely it has horrid voltage ripple - it was a massive disservice just to use it with incandescent bulbs and heater. They run on just rectified DC (no caps) or even AC. 600W and no power factor correction is another design flaw. Whatever I might connect to 12V /many amps will cost so much more than the power supply, no point to save money on power supply. It should be the most robust part of a system - a failure could burn anything connected to.
@jayvadgama7076
@jayvadgama7076 3 жыл бұрын
Happy Birthday Diode or D_____L 11-2-2021 you success fully survived 34 year.. Yes and thanks to @Václav Trpišovský for telling he's birth date.😅😃
@drewcrow5352
@drewcrow5352 3 жыл бұрын
Is it possible that the insulating coating can function to allow the skin effect to take place? The tape will function to dissipate stray inductances? Thank you for the information on improved coupling. I have found resistive wire to handle heat. Perhaps the resistance/heat diminishes an inductive essence. What material was the coil inner written? If it is iron based ferrite, I would appreciate it's conductance as improving voltage capacity, and coupling for the coiled inductance as well.
@cluna5231
@cluna5231 9 ай бұрын
Great information thank you.
@Langendimi555
@Langendimi555 3 жыл бұрын
Aaah top quality chinesium transformer did it again! Nice video, thank you!
@JuanBataan
@JuanBataan 3 жыл бұрын
Greetings from Philippines..
@JayPeeEV
@JayPeeEV 3 жыл бұрын
Idol
@JuanBataan
@JuanBataan 3 жыл бұрын
@@JayPeeEV andito ka din pla hehe
@eded8045
@eded8045 3 жыл бұрын
and the lesson taken from this for china power supplys?? pick a higher power rating than you need and not push to max or rewind the transformer with copper wire and perhaps the Inductor. Rewind with copper for these supplys might be a good video we all can benefit from
@DuroLabs85
@DuroLabs85 3 жыл бұрын
pls keep uploading videos like this
@ToleSan
@ToleSan 3 жыл бұрын
i interested on this topology since i build my two switch forward welding inverter based on your schematic. Cant wait for you next schematic video
@gamiwv
@gamiwv 3 жыл бұрын
EXCELLENT sir !
@nosafetyswitch9378
@nosafetyswitch9378 3 жыл бұрын
Why don't you wind the transformer properly now that you know the turns ratio etc? This looks like it would fix it ?
@stanimir4197
@stanimir4197 3 жыл бұрын
rewinding by hand is no fun and also it's not very likely to work at the same current (50A) even with copper wire. see 'skin effect'. The thing still needs proper temperature and over current protection.
@crusaderanimation6967
@crusaderanimation6967 3 жыл бұрын
18:44 Well i hope your gonna tell )why this topology doesn't need air gap and have windings "in same direction", when flyback need air gap and windings are "reversed", also why those diodes gone wild on secondary side (:D) but i guess those is something strictly with topology so your gonna explain it any way .
@l_szabi
@l_szabi 3 жыл бұрын
In a forward, energy goes directly from the primary side through the transformer into the secondary side. In a flyback, energy from the primary goes into the "transformer" (not really a transformer, rather a coupled inductor pair), gets stored in the air gap, and then released later into the secondary. I'm not sure on the advantages of this topology, but DGW explains the workings very well in his flyback videos, USB charger videos for example.
@crusaderanimation6967
@crusaderanimation6967 3 жыл бұрын
@@l_szabi Well I was watch in some videos about it (including diodes gone wild) so I know a bidt of theory (like flyback transformer is Inductor that stores energy) but I wonder what's difference "from transformer perspective" between taking energy by snober network and taking that energy into capacitor (especially that in some snober network there is capacitor that take that energy, just to dissipate it in resistor instead of reusing) like, from transformer point of view in both cases energy is pushed in and taken back so what's difference.
@informediatech-bruno5766
@informediatech-bruno5766 3 жыл бұрын
I bet the diode gone wild
@phenomenon9114
@phenomenon9114 3 жыл бұрын
Why there are two diode on the out put 🤔🤔
@smithelectro-plumb2994
@smithelectro-plumb2994 3 жыл бұрын
I really love you your videos sir you great and your explanation
@tvelektron
@tvelektron 3 жыл бұрын
Would be interesting to "test" the fuse, i have the feeling it may be faked to... Chris
@gicelectronics
@gicelectronics 3 жыл бұрын
Thanks so much @Diode gone wild. Please share schematics.
@CXensation
@CXensation 3 жыл бұрын
Check the fuse! It may look like a fuse but will not burn unless it is ridiculously overloaded. Which points to an inrush current problem with the design.
@batkotivalio
@batkotivalio 3 жыл бұрын
Great thank you fo these videos!!!
@Basement-Science
@Basement-Science 3 жыл бұрын
You should really get one of those Atmega328-based transistor testers. They are super cheap and can measure a lot more than your capacitor tester.
@republicoftutorials6068
@republicoftutorials6068 3 жыл бұрын
Which topology is this ? is that forward converter ?
@leopaulevans7573
@leopaulevans7573 2 жыл бұрын
DiodeGoneWild what would cause a computer 19.5 v adapter to be showing 19.5 v when test but no able to power the computer ?
@Elektronenregen
@Elektronenregen 3 жыл бұрын
Nice Video! Good explanation :)
@Zenodilodon
@Zenodilodon 3 жыл бұрын
Eww aluminum windings, that's gross cheapness. Seeing this makes me even more cautious about buying PSUs from eBay that aren't name brand.
@hichamtassi1753
@hichamtassi1753 3 жыл бұрын
Hello, i have a uc3843 with very low switching frequency and then only have 1.65v at the exit. Any idea where to look at ?
@TZCoder
@TZCoder 3 жыл бұрын
My desktop PSU failed and I found a blown chip inside TNY280PN, what does this do and should it be possible to just replace the chip?
@nails772
@nails772 3 жыл бұрын
Subbed since 2016
@alvinsuriaga2143
@alvinsuriaga2143 2 жыл бұрын
Hello sir , active speaker is rated 1500 watts , at it seems the primary side is blown already cause of over voltage , the driver is ir2153 and no opto design , is there any way to mod the circuit?? Plese help men
@mikeatlanta9306
@mikeatlanta9306 2 жыл бұрын
How can you tell which side of transformer is primary or secondary??
@__MINT_
@__MINT_ 3 жыл бұрын
Will you rewind the transformer?
@ithalkomedi1513
@ithalkomedi1513 3 жыл бұрын
+
@DavidMG99
@DavidMG99 3 жыл бұрын
👍👍 thanks for the info
@philippezhang
@philippezhang 3 жыл бұрын
thank you very much for sharing
@devinhales
@devinhales 3 жыл бұрын
After counting the windings, can you add "Ah! Ah! Ahhh!" with some thunder sounds please?
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