@@Killerspieler0815 he has so many homemade devices he should share them with us so we can make them too like the ESR tester i am rely interested in it
I can't thank you enough for all the things i've learned from your channel and your website. Flyback power supplies were some engineering sorcery to me before i found your channel, even though i'm studiying electrical engineering for 4 years now. I'm actually planing on designing my own one for audio amplifiers and lithium chargers. It would be awesome if you could do a video on designing one from your website. Will definately consider supporting you via patreon. Keep it up with great content bro.
The ultra cheap transformers have absolutely no mains isolation in them, except the lacquer on the wires (0.05 or 0.005mm thick!). Be grateful for the isolation that you can get. :)
Thanks for this forensic teardown and explanation. My employer purchases similar cheap very dodgey 5V chargers for staff who lose their company issued mobile. I can show now this is a risk to the equipment but more seriously one to his valuable staff and why the OEM charger is the only option even though they cost more.
Hey, can you make vadio on all type of power supply like flyback, half bridge, full bridge, push pull and their specifications. Because no one can't explain power supply clearly then you one UA-cam You are the master of power supply 👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍
The primary current sense resistor is not just for short circuit protection. It may be for current mode control (simple compensation network). This allows for pulse by pulse current limiting . The control has actually two loops - innermost current control loop, terminating the on state by reaching a current target, defined by the outermost voltage control loop error amplifier, comparing the voltage feedback with internal reference.
At first I found your singing (intonation) annoying but you really do explain things very clearly. I kind of like your singing now. Thumbs up, Subscribed.
Yes i power up a USB stereo speakers conected to laptop with similar 5v power supply.The blue cap was shorted ,probably via ground loop.And the laptop exploded,,the wire melted.
Some of those switching chips incorporate a built in snubber, using a high voltage avalanche clamp to limit the turn off voltage of the power switch. As they are generally low power, this does not increase power dissipation in the chip too much, but saves on external component cost.
Hmm very under rated, 1 Amp total. Even your loverly cat didn't think much of it lol. They always lie through there teeth about what a device can do :-(. Pity they didn't include an opto coupler :-(
gumpi5 Yes you are right there lol, the copper is likely the most expensive part. I would rather have a decent device that costs more and lasts. I use the chargers that were supplied with the original phone/tablet, they are normally quite decent. I really don't like the idea of building chargers in to mains wall sockets, but people go mad for them, ill stay old fashoned lol.
That's a spiral of lies. Once the competition starts lying, They have to lie as well. Once the competition lies even more, they also have to lie even more to keep up. The absence of an optocoupler is definitely not the worst problem. Even some branded chargers have none.
Nick B, Very true, iv'''e nooover boon god at spooling Nuck lol. Shame you didn't make an interesting comment, just picking fault with my imperfect spelling, shame :-(
I think it's time to compare similar PRICE point products from different countries instead of just looking at cheap Chinese products. I don't think most people need a lot of proofs for "you get what you pay for". It would be good to see "you get MORE than what you paid for".
So, you told that flyback topology uses ferrite core with air gap. But, what will happen if I use a core with air gap in half bridge or push-pull topology?
It will probably still work, but there will be much more of inductive current, causing more losses in the switching transistors. The air gap reduces the inductance of the windings.
Ok, so it will be better not to use that core in half bridge topology SMPS. Thank you for the response. I would then build a flyback power supply (1000w).
@@adamoneilwilliams7308 What do you mean? There is plastic on the half of the contacts. (Maybe I understood something wrong English is not my first language).
Greetings everyone. 6:17 ``it´s top secret! don´t show it or they assassite you!´´ Listen to your cat !!! he knows what he says. Thank you for explaining how these "contraptions" work. all care is little. success.
As seen in other videos of DiodeGoneWild, cases would appear to come from recycled projects so ratings are not accurate. Paws for thought when thinking of using some of these chargers.
Sweet dreams are made of this Who am I to disagree? I travel the world And the seven seas, Everybody's looking for something. Some of them want to use you Some of them want to get used by you Some of them want to abuse you Some of them want to be abused. Sweet dreams are made of this Who am I to disagree? I travel the world And the seven seas Everybody's looking for something Hold your head up Keep your head up, movin' on Hold your head up, movin' on 2.0A
Crazy... It says 1A because it's a fake Apple charger, except it's the American design for iPhones. In Europe, we have a flat one with the little triangles at the side so it would fit perfect in a 2-prong European outlet (like some extension cords / power strips have). They just put European prongs on it, but the cube design is for the Japanese / American / Canedian market. Still incredibly dangerous. Unbelievable they can sleep at night knowing they made / sold this. A woman once got electrocuted when picking up her iPhone (back when they were made from aluminium).
Well, that was very dodgy! 😀 With cheap Chinese products, there is hidden divider or multiplier number. It's never bellow 2 and usually around 3. In this case, you take the claimed ratings, divide it by this number, you have your true rating. This is a 750mA~1A design. I can tell by the value of output capacitor. Rule of thumb is 470uF/Amp.
The chip is designed for 5V 1200mA with universal mains (the datasheet says this). The schematic suggests 1.5 ohm current sensing resistor, but they have used a 2 ohm resistor, which reduces the current limit to 900mA. Not sure why. Maybe it kept blowing at 1200mA :D.
@@DiodeGoneWild That explains it. Even the chip is trying to imitate Linear technology's logo and part numbering LP, instead of LT! I wonder what would happen if you repeatedly short out the output?!!
Ive said it before but no one else on youtube explains switching power supplies this clearly
Agreed
I agree. He had a really good 2 part video a while back that is just fantastic. Really simple easy to understand explanation.
hey diodegonewild can you plz make a video about your homemade devices
@MA4DI -
YES , it would be interesting how diodegonewild build his stuff
Yes, definitely
@@Killerspieler0815 he has so many homemade devices he should share them with us so we can make them too like the ESR tester i am rely interested in it
@MA4DI -
YES , again
I can't thank you enough for all the things i've learned from your channel and your website. Flyback power supplies were some engineering sorcery to me before i found your channel, even though i'm studiying electrical engineering for 4 years now. I'm actually planing on designing my own one for audio amplifiers and lithium chargers. It would be awesome if you could do a video on designing one from your website. Will definately consider supporting you via patreon. Keep it up with great content bro.
Your channel is the greatest, I love your videos. This dodgy USB charger needs more saaaalt
needs more saaaaaaaaaaaaaaaaaalt XD
More salt hahahaaha actually that water heater video where salt is poured in the container..
@@s40s06 I think "even more saaaaalt" has evolved into a local meme.
I would like to see some video providing detail on magnetics (coils, transformers), i.e. why use air gaps, dynamic air gaps etc.
Yes, I would too. I would like to know more about how an air gap effects the working of an inductor, and how saturation is used in an inductor.
air gaps are used in transformer to prevent the core from magnetic saturation
Very robust transformer. They have put 2 turns of isolating tape on the windings in stead of just one. 👍
The ultra cheap transformers have absolutely no mains isolation in them, except the lacquer on the wires (0.05 or 0.005mm thick!). Be grateful for the isolation that you can get. :)
I like the clean schematic
It is rare talent ❤️
Needs so much patience and multimeter continuity
- And it doesn't explode, which is a good sign! XD
Thanks for this forensic teardown and explanation. My employer purchases similar cheap very dodgey 5V chargers for staff who lose their company issued mobile. I can show now this is a risk to the equipment but more seriously one to his valuable staff and why the OEM charger is the only option even though they cost more.
I love to learn about switching circuit with you as teacher. You explain that very clearly. Many thanks, I subscribed to the channel.
Hey, can you make vadio on all type of power supply like flyback, half bridge, full bridge, push pull and their specifications.
Because no one can't explain power supply clearly then you one UA-cam
You are the master of power supply
👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍
Yup, I agree.
That pc psu must be good, cant wait till u upload it. Great video mate!!
Love the cat :-D. Also thanks for always reversing the schematics and talking so much about them. There is so much to learn!
I wish I could go to the same school of electronics as you. Brilliant video.
The funny part is that I didn't go to any school of electronics ...
What?! No way! How did you obtain this vast knowledge about electronics
*DIOOODDDEEE!!!* 😂
I love his pronunciation !
110 000 odběratelů jak vidim tak se ti daří, jen tak dál :)
Your drawn schematics are legendary.
TILL NOW,YOUR CAT MUST HAVE BECOME A MASTER IN ELECTRONICS BY WATCHING YOU🔥👍😂🤣
Always excellent, informative tutorials with a hint of humour, brilliant.
I like your videos a lot, with schematics, explanation and your cat's contribution 🙂
We luv your fire extinguisher 05:30 .
The primary current sense resistor is not just for short circuit protection. It may be for current mode control (simple compensation network). This allows for pulse by pulse current limiting . The control has actually two loops - innermost current control loop, terminating the on state by reaching a current target, defined by the outermost voltage control loop error amplifier, comparing the voltage feedback with internal reference.
this cat really likes electronics 👍😄😳
At first I found your singing (intonation) annoying but you really do explain things very clearly. I kind of like your singing now. Thumbs up, Subscribed.
Yes i power up a USB stereo speakers conected to laptop with similar 5v power supply.The blue cap was shorted ,probably via ground loop.And the laptop exploded,,the wire melted.
Hooray! A new ‘Are you Kiddin’ me!’ video 😁
Awesome video! keep them going, I really look forward to see that atx PSU open.
Some of those switching chips incorporate a built in snubber, using a high voltage avalanche clamp to limit the turn off voltage of the power switch. As they are generally low power, this does not increase power dissipation in the chip too much, but saves on external component cost.
I like these series like you
It isn't nearly as dodgy as I expected! I'd like to see also some ripple output measurements at different loads. Thanks for great video!
Thank you for spot lighting this piece. .
Thank you for your very interesting videos, good work and explanations! And I'm a big fan of your Czech-accented English speaking! ;)
I love this blogs. It teach me english and electronics. Thank you! Im from Poland 😀
i love when he said "That's quite doggy".
Great video, you have really helped me understand the principle operation of power supplies. thanks
Chinese people: Let's make cheap chargers that only work with our adapters!
Dodgy chinesium things are made for birth control. China has an overpopulation problem
What an adorable cat!
This is great. It's like watching bigclive with a Czech accent. Excuse me while I binge-watch the rest of your vids.
Hmm very under rated, 1 Amp total.
Even your loverly cat didn't think much of it lol.
They always lie through there teeth about what a device can do :-(.
Pity they didn't include an opto coupler :-(
What you've expected from a device that costs 1 or 2 $ £ € or whatever... That's the price of the copper windings :D
gumpi5
Yes you are right there lol, the copper is likely the most expensive part.
I would rather have a decent device that costs more and lasts.
I use the chargers that were supplied with the original phone/tablet, they are normally quite decent.
I really don't like the idea of building chargers in to mains wall sockets, but people go mad for them, ill stay old fashoned lol.
That's a spiral of lies. Once the competition starts lying, They have to lie as well. Once the competition lies even more, they also have to lie even more to keep up. The absence of an optocoupler is definitely not the worst problem. Even some branded chargers have none.
... their teeth ...
Nick B, Very true, iv'''e nooover boon god at spooling Nuck lol.
Shame you didn't make an interesting comment, just picking fault with my imperfect spelling, shame :-(
Diodegonewild is so retro he still uses equipment that was made in a country that doesn't even exist any more ;)
Superb demo and lecture ! Thank you!
Can't wait to see inside of the huge computer power supply...
Useful video 👍
To test the dodgy charger I have to use this dodgy adapter :) 1:47
*dodginess intensifies*
Always loves your videos
Hahaha beer fire extinguisher!!!
Such a informative video. Thank you so much for sharing this.
I only watch your videos for the cats. Everything else is a bonus. :-)
I LIKE YOUR ENGLISH🤗
Hahahahaja ha! !
Another excellent break down 👍😀
Good Analysis
Let's make a drink game. Drink every time he says "dodgy"
Your plugs are wrong. That's why it didn't fit.
Just kidding. 😄
i cant wait for that computer power supply! BRING IT ON!!
Poland confirms mains plug type :)
I like ur cat 🐈
Nice Dan
you are safety concious, like me.....its good, keep it up
can you explain how to control the current output in SMPS using the UC3844 pls
I think load regulation should be covered in the datasheet
I think load regulation should be covered in the datasheet
Good. Keep it that way.
Better Transformer but less then 1 mm is not good, nice Video Thanks 😊
0:06 I thought you are going to take a look at your cat 😂😁
I want to see that compuer power suply in next video, can you make video about it? Btw nice video as always.
excellent as usual
I want to a story about a well known make of dry cabinets that often failed.
be carefull with that fire extinguisher man
I think it's time to compare similar PRICE point products from different countries instead of just looking at cheap Chinese products. I don't think most people need a lot of proofs for "you get what you pay for". It would be good to see "you get MORE than what you paid for".
It probably won't fit in a Schuko socket either, at least not without damaging the case of the "charger" with the ground contacts.
Just love your beautiful cat 🐺
Thanks for your informative video
In belgium we also use the exact same type of socket ;)
So, you told that flyback topology uses ferrite core with air gap.
But, what will happen if I use a core with air gap in half bridge or push-pull topology?
It will probably still work, but there will be much more of inductive current, causing more losses in the switching transistors. The air gap reduces the inductance of the windings.
Ok, so it will be better not to use that core in half bridge topology SMPS. Thank you for the response.
I would then build a flyback power supply (1000w).
would you do a cheap QC3.0 / PD charger teardown in the future?
Often the current value is incorrect on these devices.
Just ask the cat, it's a sweetheart.
this dodgy usb chargeeeeeerrrrrr
Hi! Love your videos!
european outlets are weird but they are the second safest outlet and plug
ttv. btw weird? They are clean looking and modern wdym lol
Why second safest?
because the contacts are not isolated
@@adamoneilwilliams7308 What do you mean? There is plastic on the half of the contacts. (Maybe I understood something wrong English is not my first language).
And which are first?
Greetings everyone. 6:17 ``it´s top secret! don´t show it or they assassite you!´´ Listen to your cat !!! he knows what he says. Thank you for explaining how these "contraptions" work. all care is little. success.
Good job friend, you are the best professor with an excellent explanation!
Hello to the F.B.I cat hhh
Ah the old-school USSR electronics tools.
这个在我们这边卖RMB10元。 LP3773可以做到5W。这个可能是变压器不太好的原因导致压降很大。这种东西不要看外表，价格就决定性能指标。中国制造有很多东西，廉价的，高品质的，你可以去常识一些例如品胜之类的用品质取胜的产品。
I'm missing the DODGY! stamp at the end of the video ;)
Yaayy anotheer chaargeeer! 🙂👍
@Agustinus Reynaldi exactly
thanks a lot man we appreciate it very much 🌺🌺 epic teacher
As seen in other videos of DiodeGoneWild, cases would appear to come from recycled projects so ratings are not accurate.
Paws for thought when thinking of using some of these chargers.
As weller would say "The transformer *IS* the fuse"
Another good video and product "review" :)
Sweet dreams are made of this
Who am I to disagree?
I travel the world
And the seven seas,
Everybody's looking for something.
Some of them want to use you
Some of them want to get used by you
Some of them want to abuse you
Some of them want to be abused.
Sweet dreams are made of this
Who am I to disagree?
I travel the world
And the seven seas
Everybody's looking for something
Hold your head up
Keep your head up, movin' on
Hold your head up, movin' on
2.0A
Crazy... It says 1A because it's a fake Apple charger, except it's the American design for iPhones. In Europe, we have a flat one with the little triangles at the side so it would fit perfect in a 2-prong European outlet (like some extension cords / power strips have). They just put European prongs on it, but the cube design is for the Japanese / American / Canedian market. Still incredibly dangerous. Unbelievable they can sleep at night knowing they made / sold this. A woman once got electrocuted when picking up her iPhone (back when they were made from aluminium).
How can one donate you devices to make a video with mate?
What device would you like to donate? Contact me at danyk@centrum.cz
The pins in the Euro plug are bent inwards. These are straight. This is no standard plug. In Euro plug the pins are 4 mm when others have 4.8 mm.
This transformer look much better in most cheapo USB adaptor.. by the way what is doji?
Some bridge rectifier chip can also have the fuse feature.
Amazing.... we would have never known.. Thank you
(I don't know which one is COoLer, your CAT or CRO) 🇺🇸❤
Can you test if cellphone chargers that connect to the car are dangerous for the phone?
Amazing work, well explained! But the cat does not approve this design! It is not cat safety :))
I enjoy your cat man. Someone should made one video with cat. ☺️☺️
i love that cat,...
hello bro my charger Makes Weird Noise "zzzzzz", can we eliminate it? where the sound came from
Well, that was very dodgy! 😀
With cheap Chinese products, there is hidden divider or multiplier number. It's never bellow 2 and usually around 3.
In this case, you take the claimed ratings, divide it by this number, you have your true rating.
This is a 750mA~1A design. I can tell by the value of output capacitor. Rule of thumb is 470uF/Amp.
The chip is designed for 5V 1200mA with universal mains (the datasheet says this). The schematic suggests 1.5 ohm current sensing resistor, but they have used a 2 ohm resistor, which reduces the current limit to 900mA. Not sure why. Maybe it kept blowing at 1200mA :D.
@@DiodeGoneWild That explains it.
Even the chip is trying to imitate Linear technology's logo and part numbering LP, instead of LT!
I wonder what would happen if you repeatedly short out the output?!!