24V 1000W power supply - autopsy (transformer, GDT, capacitors) 

This

Yes

That would be interesting. GN has had offers from viewers from around the globe to send in their PSU. If they haven't cashed in on an offer from EU yet, they can divert it to DGW. Actually the publication that raised the issue first was TechPowerUp, and their editor from Greece, Aris, who was previously at Tom's Hardware US/Global before that publication self-destructed spectacularly. He also has his own YT channel Hardware Busters. He too, i seem to remember, would have liked to see more of these PSUs to come to more solid conclusions, but didn't necessarily have the budget for it. Unfortunately the PSU comes in several varieties which you can't necessarily just tell apart; some are by all reason adequate, others appear to have some issues with transistor quality or gate drive which leads to potential self-destruction. And if you do get a unit which operates correctly, there isn't a lot you can conclude from it.

I'd love to hear the "that's niiicee" and "now it's properly blown!" as he examines the gigabyte psu

why is that a common problem with those PSU's???

Ferrite core or High frequency transfomer

ગુજરાતી માં બોલો

Yes he should make detailed video about it. I also want to learn about those. : )

"High quality"? It has no power factor correction - effectively it's illegal in the EU (and UK). The primary caps are leaking already. Gate drivers are a joke. The fan is overdriven to hell and back. It's a trash bin material... just not 'super dodgy' level.

@@stanimir4197 “transformer” dude, not power supply. Calm down and read carefully!

@@michaelfisher9671 I did - it just didn't make sense - the secondary caps were fine too. The filtering choke was fine too but got properly scratched, etc. Having the transformer alone being decent won't do much good.

If DiodeGoneWild forgets something the cat will always be mad at him!

@@Zebra_Paw Well Of Course, the cat is the real boss here... 😁

He's evolving backwards.

This isn't the Ben Heck Show.

same here

@@ToleSan It is not difficult though. First thing you need to know is that when you are testing put it in series with a 100W tungsten lamp (unless the PSU is like 150W) and if shorted the lamp will light up instead of your circuitry dying. Don't worry about it lighting up a little bit under the load.

They looked a bit dot matrixy to me. The sleeves on real Nippin-Chemicon caps are solid print. Plus they don't make that value capacitor at all. So there's that.

It would be about the same as in the 600W power supply: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-tQRxEywlhyU.html

This is so old... I like the fact that you brought this back. He does keep this so he could. Now don't expect him to make an autopsy of its transformer because he is using the Pirl charger.

It'd be a shame to wreck a decent PSU.

the problem is probably the transformer itself, way too low inductance!

None this time surprisingly!

With so many "recording errors" 🤣😂😅

The whole device was good... but I am not sure if the rating is really 1000W... he should have tried putting a buck converter in series with the fan and see if it still runs good at 1000W without overdriving the fan. In those power supplies you also want to redo the soldering, it's always quite poor.

Lol.

@@DuroLabs85 Putting the transformer in water might not be the best idea... but yes his PWM technique was cool :)

I can't.find the exact video, I watched almost all his videos, but he said that dis is the pwm mode - I did it also when I disasemble the ferit core - cheers & enjoy!! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-tWG0SNYzFRI.html

@@TheJavaSync I know this video as well, but can't remember which one it is.

I feel like unless people are all mad at him about not remounting it, he won't do it!

With a 12V fan running at 24V, it was a walking dead ;)

@@DiodeGoneWild As you said, all those power supplies always have a hidden disaster you have to fix :D P.S. I wonder if it would survive at 1000W with the fan spinning at its normal speed. I also wonder whether this is really supposed to handle 1000W. The last one was a 360W model, not 600W at all.

@@Zebra_Paw In part 1 he draws attention to a warning label saying that it's recommended to only run it at 80% of rated power. Which makes it an 800W power supply. I wouldn't be impressed by a pint glass which was only recommended to hold 80% of a pint 😐

@@DiodeGoneWild - At the start of the video we could hear it *SCREAMING* _"please don't dissect me, I am OK, please NOOOOoooooooo...."_ !

I prefer good videos than lazy quick uploaded ones!

It was quite nice. Just need to fix the overdriven fan with a buck converter, and probably redo the soldering.

@@Zebra_Paw yes... Maybe also replace the primary caps

@@fabriziobrutti1205 Not really necessary but worth it

Flux should not remain on the board after it has been wave soldered. We used to throw all the boards we made into a dishwasher to clean them. Flux we used was water soluble. There's a bubbler the boards pass over before they hit the wave. The bubbles is the flux.

Rosin-based fluxes vary from pale yellow to quite brown. Generally it is quite acceptable to leave the residue on the board unless the board is to be conformally coated, subjected to quite adverse conditions or has high impedance circuitry. In days gone by there were often massive amounts of flux residue on consumer electronics boards. Water soluble fluxes use organic acids as activators (as do rosin fluxes, but those in the water soluble fluxes are much more aggressive). Residues of such fluxes MUST be removed with a few hours otherwise they become very difficult to remove. These fluxes tend to be quite electrically conductive and will definitely cause corrosion. Proper washing is not a trivial process, especially on surface mount boards where residues tend to get trapped under components and not removed properly without fairly forceful water impingement. Power supply boards may not be washable, primarily because of the transformer. It may be OK, but it has to be evaluated very carefully.

it obviously isn't. If you buy two times the same PSU from the same Ebay listing they won't be identical, they use random crap trust me! As he said in another video, they all have their own hidden disaster, that you better fix before even powering them. Also the soldering tends to be poor. I may be biased because I hate almost every soldering that isn't nicely handmade, but for those power supplies I'd really say redo the soldering! you might want to add themal paste as well in some cases, but not too much of it if there are already thermal insulation pads.

it sounds like a 12V fan running on 24V to me.

@@1pcfred That sounded like normal 12V 2.5A delta fan. Also too familiar with 48V fans that will nicely slice your fingers and these make more worse noise if you run 100% pwm :) Edit: Also seen cases where 12V fan designed as 12V small current and it was run with 18-20V -> smoke in 2-5 min.

@@1pcfred it is

@@LimbaZero that fan sounded like it was running fast to me. I have heard some noisy old Delta fans. I think the major reason they were noisy is because they were old with beat bearings. The old fans were serviceable though. You could pop the impellers out of them and lubricate the bearings. They had lock rings in them that you could get out.

would never... would make it better

That transformer is why the PSU worked. It had nothing else going for it really.

@@1pcfred c'mon the output filter caps were ok, also 50V.

@@stanimir4197 I can't even find that company on the Internet. Niani? I don't know why they bothered to trademark the name. They're not even using it except on those capacitors.

It's probably all roughly similar. My starting point for information about technical tapes is 3M's website. 3m has polyester tape such as type 1350F-2, and its dielectric strength is 7kV for a 254µm thick tape. You still often want to use at least 2 layers of tape, just in case there is a microperforation in the tape. This tape is for use up to 130 degrees, but you can also get kapton/polyimide tapes for up to 155 degrees C. I really like 3m's products, but they sure are expensive! Of course, if you buy from a chinese bottom feeder, you never know for sure what kind of tape it is. It might very well be just normal packaging tape with a yellow glue layer. If you wanna buy from china and have reliable products, you really have to have personal contact with the factory.

Já na to koukám hlavně kvůli tomu přízvuku :) Je to můj bobřík odvahy :D

I think saying that this PSU "works" is a bit of a stretch. It's thrown together from junk, seemingly fairly mindlessly, not well adjusted; that it runs at all may be more or less coincidental, it's way off spec in the gate drive and fan supply. It couldn't be expected to work for very long. Obviously there's a lot of companies there who can build you perfectly adequate products, but adequate products come with an adequate price tag, they aren't scary cheap.

@@SianaGearz The last power supply he reviewed was 360W... he looked for the cheapest 600W, he got scammed. He still doesn't know it, he thinks it was just a bad unit. This one is probably also not meant to be 1000W.

@@Zebra_Paw Who, DiodeGoneWild? Don't underestimate him like that. He's been an SMPS expert for i think around 20 years, give or take a few, he has been maintaining an SMPS design website since 2002. He buys these things because he knows that they're junk, he is just curious to find out why they're junk and show us lot. He's just having fun with these things.

@@SianaGearz Yes but I know those, he looked for the cheapest 600W one not to waste too much money and got scammed. It handled 360W fine though, because it was a 360W PSU.

It probably just drys out quicker than it would being enclosed.

Generally no as the hotter one takes more of the load and potentially runs away especially if they were taken out of a dustbin to start with so unmatched

You have to put a low value (

As for the second original question of this thread if you’re asking that whatever you’re trying to do won’t go well

@@jms019 modify the amperage detector, but so that it withstands minimal sudden surges as when starting an engine for example ...

@@Franco_FC This is likely to make the thing unstable. Think Tacoma Narrows. It’s impossible to generalise a design that will work on next week’s random Chinese power supply. For more detail go study control theory.

I have a piece of string in my hand. Can you guess the colour and length of my string? OK, now how could anybody possibly guess what video and which song you are talking about?

Post a link to the video then someone might recognise the song and tell you what it is.

@@johncoops6897 in his old videos he played his songs from pc/MP3 player and if he listened that songs to many times I think he can recognise that.

@@simontay4851 here is tha videos that I liked it's song :-ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-uR0MtGefqU0.html in this video he makes an tube Pre amplifier and when he played the song just about 3 or 4 second I am liking the song but no music recognise app can recognise.and here is second video :-ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9RBnn8ydwRw.html In this video he showed his tv signal is lagging, after hearing that song even it lagging I am liking it but still recognise app can't recognise it, I tryed video pause and google lence to recognise the man in this song but it doesn't worked ither.and I love to find new songs and music so I am curious.

@@jayvadgama3703 - Now I see you have answered the questions. So have edited this comment.

this is a forward, not a halfbridge...

That pulldown could be a case of someone working from a schematic without an understanding of what the schematic entails. I remember watching a BigCliveLive video where he was putting together a lightbulb from a kit and noted that some of the supplied components didn't make sense given the loads the thing he was building was supposed to handle, he suspected that whoever put the kit together was working from a second or third generation copy of whatever the original schematic and misread some values.

Showing variations by flipping cards on sticky tape hinges was a nice touch.

Without that 10k "bleeder" that MOSFET won't live long..it can "DIE" even before you give it a gate pulse...

@@analoghardwaretops3976 Why would it? It is already almost shorted (at DC) to source through the gate driving transformer. That 10k contributes nothing to that.

Theoretically..it may not require it in this app. but it is one extra level of protection...that doesn't add much to the cost..and is most effective when the 10k is wired directly on to the g-s pins , & not through pcb traces.. For the benifit of those who are not aware of the device behaviour... Any MOSFET has an insulated gate.....in this case..it's METAL OXIDE... this insulated gate has intrinsically built in 2 capacitors... which is a part of manufacturing process and cannot be avoided or removed...else we wouldn't have "MOSFETs..." same goes for I.G.B.T.'s..... Most commonly used and easier to manufacture.., with more simpler drive circuitry are the " ENHANCEMENT MODE" MOSFETs type... So in the case of MOSFETs... there is one Gate- to -Drain capacitance...the other being Gate -to -Source capacitance .... The Drain - Source " channel" , is not open circuited , with no drive/ bias/ signal..but does have a very high resistance.... @ power up..that " high dc" potential...leaks a current to charge up that insulated gate..... Once that gate is sufficiently charged .. i.e. V-gs turn on threshold is reached.... the MOSFET will turn on..even when there's no valid gate drive command given... With the " bleeder " resistor (10k) across g- s , it having a very much lower resistance than the D-S , that charge is " bled " off/ diverted from the gate..to source..keeping it below V gs threshold..., thereby protecting the MOSFET ..

Model is ACME ;)

thats PQ Cores. But not sure the detail of it. You can search by internal core diameter

@@ToleSan ok i just wanted to know the name. :)

@@DuroLabs85 Well... there are a lot of things you need to know before building a such thing!

@@Zebra_Paw Ya you are true but I just wanted to know what transformer was called I got the datasheets online and now I can continue my calculations : )

Used Tractor Parts?

@@1pcfred yeah, unshielded twisted pair.

@@jkobain oh OK. I tried doing a search on UTP and that one didn't come up for me.

If you actually watch the video, then you would find out.

@@johncoops6897 My apologies good sir. I was taking care of my dying mother and must’ve missed that part of the video.

more likely fake. The 600W one had capacitors with wax-filled dents under the heatshrinks.

​@@DiodeGoneWild So they are probably sourcing them from somewhere else, where they don't care about denting them. Probably some third world country, like India or Africa where all our e-waste goes. Gets bought back by the Chinese for pennies and gets reused in cheap electronics sold from china. It's a nice little industry, turning lemons into lemonade I guess! Can't knock them for being entrepreneurs. It's not like they have very many other options in corrupt parts of the world. It's easy for us to judge them with all our industry standards. These people barely earn enough money to eat. But there is a lot of good, cheap stuff out there also. You just gotta know what you're buying I suppose. Your channel is a great education into what's out there. At the end of the day, If you don't know the possible dangers, stick to the named brands huh. To be fair though, even the named brands have there issues from time to time.

@@anthonydenn4345 They pull them off scrap boards with pliers. In the process they squeeze too hard. That's where the dents come from. There's a whole parts recycling industry in China where they disassemble scrap electronics. Then they bale the parts up and sell them. That's why they can make stuff so cheap. They're literally making it out of garbage.

I'm guessing they probably grade the quality of the recycled parts used. And it's reflected in the asking price. Hence, you get what you pay for 😄

@@anthonydenn4345 I doubt it. I imagine it is more of a you get what you get deal. One thing China doesn't do is much QC.

Amouranth

@@ornessarhithfaeron3576 How do you know?