"What ever might be the best way of opening it, let's just cut into the corner. There's probably a lot of cut corners inside of it anyway" 🤣These are my kind of puns
I am almost 25 years old and i am a newly graduated electronics engineer, i am watching your videos for almost 4 years. I learned more from you than any other teacher or professor at my university, i hope you best in life and wish you make these videos in the future.😊
@Stinktierchen its a nice university but they focus too much on theory also there is little practical work. All they teach Matlab, RF, software and control theory. There is little work done in electronics, power electronics and electrical machines which i am interested mostly.
Insulating a human from deadly mains voltage by just a lacquer on super hot wire in baking transformer. I would say it is deadly actually not just dodgy. Also broken rezistor from new or after just a few minutes of use and the temperature during use. You can almost call it fire starter.
17 year old guy, think I started watching when I was... Younger- ish. still watching and interested! Keep the videos coming. And I'd like to see a restoration of that radio/tape player.
Yes Indeed I watch your videos till end. Gaining knowledge which my university took years to explain. UA-camrs such as EEVBlog, Fran Blanche, Andreas Spiess, Great Scott, Electroboom, Marco Reps, Ben Eater, Imsai guy. are such a blessing to me for getting such knowledge. Being from the "Tik Tok" generation I still consider myself as a old school guy. Choosing electronics as my hobby was a great decision which saved me from this new fangled generation addictions.
Excellent review and testing of these adjustable power supplies getting advertised of eBay / Aliexpress / etc. Great schematic and explanation on how it works, most interesting. I'm 192 years old btw.
I have a similar power supply, with UK plug. Mine is also about 3v to 30v ish.. No stickers on box, just pressed in markings when the box was formed. I ONLY use it to dim my otherwise bloody bright icicle window Christmas lights. I knock them from the normal 12v down to about 8v, which makes them much better on the eyes and they still look cool. I think most of us that watch your videos absolutely love what you do, and the length does not matter. If you have something to show and talk about then let it takes a long time, unless you don't want to talk that long lol, I would not blame you. If I may, I love watching your long videos, it is like being there with you as you rip stuff apart and take the time to explain things for everyone :) (I did not mean that in a creepy way lol)
I was 12 when i started watching your videos now i'm 16 and i love your videos. This power supply is a prototype of self dismantling power supply the next ones will be dissoldering components it will speed up recycling🤣
I’m 18 and I have been watching your videos for 4 years. You are an inspiration to young people who want to make a career in electronic; Your knowledge is gold for me. Thank you for what you do!
29:59, I've been watching your channel since I was 15, now I'm nearly 19 and it's helped me a lot in regards to analogue electronics. Maybe I found your channel due to not having my neurons necrotized by Tiktok/Instagram/whatever normies scroll nowadays. Now that I've won several national and state electronics competitions here in Romania, I'm looking forward to attending electronics and telecoms college, where I'll continue watching your videos :)
I'm 19 years old and thanks to you I got the love for electronics. I've been watching you for a couple of years now and I gotta say that I appreciate your work and I love your cat and dog. This year I'll go to college and study electrical engineering (hope I can make it out) ✌💙
Thanks for this one! I've seen A LOT of people using this sort of adjustable power supply that looks identical but sold under different generic brand names. It seems the appeal of them is they're cheap, easier to use and smaller than a lab bench power supply, easily bought on Amazon with next day delivery and can easily be permanently mounted into something. Always suspected they didn't meet minimum electrical safety standards but good to see it proven beyond a doubt in a teardown. This also explains why people often have issues with the output sagging under load even within the 60W spec or the output ripple interfering with circuits.
Ja, a REAL 60 Watt supply, followed by a decent buck, or one of the buck/boost modules, much safer, better performance, and, if you put it in a case, you can "open up" the laptop supply, for better cooling... even put in a small fan with a thermistor control.
@@lohikarhu734 these days there are even such devices where you plug in a laptop TypeC charger and the device asks the charger for the nearest voltage then buck/boosts it internally to the setpoint. But that is more expensive I guess... And there is also TypeC PD-PPU standard to ask the charger for a specific voltage not a predefined step, as if the TypeC standard is not overcomplicated enough! :P
@@Petertronic Yeah pretty sure he does use an almost identical one with a comical brand name on stream, but I think he knows it's not of good quality, he just bought it because cheap and Amazon next day, I don't think he's permanently installed any of them in projects at least, he just uses it for temporary testing (I think?).
Sir as u asked, yes youngers too watch your videos very seriously ❤ I'm 23 years old viewer from India and superrrrr excited for the *cassette player* restoration and theory video ❤😊
Haha same here. I'm 18 and i love this guy's videos. Been watching for at least 7-8 years & I've learned a lot from him. His explanations are just very good. Also very excited about the cassette player restoration!
Watched a month ago and just watched the full length again, and both times I was wide awake at the end. I don't find 30:29 too long. But I can only guess a considerable amount of time was spent making it. Definitely worth a second look.
Hello Danyk, 60yo watching from Tasmania. Been watching you for s few years. As an Aussie, I fully approve of the use of sarcasam and you can say “Bloody Hell” in your beautiful Czech accest as often as you wish! Absolutely LOVE your electromagnetic device …(Wattmeters, Phasemeters, Ferroresonsnt Voltage Reg Transformers and the like) … videos. People these days need to know just how clever our ancestors were with some magnet wire and silicon steel laminations! Been doing electronics since I was 4 years old (1968)…but the field of electronics is so vast I still learn things I did not know from some of your videos. In the case of this specific video, watched it all, went over some parts two or three times, read everybit of on screen text…so you know your effort was not wasted. Make my own electronics videos but have not posted up any to you tube yet..so I know how mich effort is involved…psrticularly getting CRO screen or multimeter shots that go with the measurements you are making. One minor critique…not only of you, but most other electronics you tubers as well…I take mild offense to the term, “Reverse Engineer” because this seems to ligitimize the activities of degree “engineers” eployed at companies whao make all this stuff at the expense of those such as yourself. From what I have seen of what you do, you are far more deserving of the title of “electronic engineer” than many of those working for such manifacturers. Sure, thay are supposed to have learned all the mathematics…but I feel the gulf between theory and practice is still far too wide. So I use the term, “I am going to Draw The Circuit/Schmatic of this device” to reveal the thinking process of those who designed it and to expose any flaws in that thinking process. I have drawn the circuits of thousands of pieces of gear, from analog TV studio gear to medical gear to RF gear…that is how I learned most of what I know now and I encourage all the youngsters commenting here to do the same!
Cute little power supply. Highly recommended to destroy multiple electronic devices that require a stable DC input such as notebooks. It also functions as an excellent high frequency jamming device. But wait, it can do more! You can use it as a heater and the fourth and final (literally) function of this 4 in 1 device will be as a lighter.
That 7-segment voltage display is an off the shelf module. I've bought bags full of them at hobby stores. They're often designed for convenience to run off the voltage they're measuring, which explains why it gets dimmer as you decrease the voltage to minimum--sometimes they have a separate supply pin you can use if you don't want to do that. They're not very accurate but they are good for just sticking some kind of indicator to give you a rough idea of the voltage present somewhere.
I really enjoy your videos and although I am into electronics for three decades, I still learn a lot. I may not be the youngest viewer, but 47 is not too old either… 😅
Danke! Thank you! You showed a lot of your work! A lot details. I am fearly screaming for the poti with primary side switch :Ö: Very good work. Highly informativ.
for me, the best adjustable power supply is always the combination of a well known good PSU (like an old laptop, original repurposed psu) in combo with a buck-boost board. It offers CC, CV, and it's safe because the original PSU is safe and properly isolated. It's so dodgy to control an output of a bench adjustable PSU in the same transformer as the PSU's own auxiliary psu and have to deal with such a mess because of that
I have couple of similar products. Double feedback look probably is the reason why 3-12V version tops potentiometer halfway while 3-24V version adjust after turning pot more than half way too. Brilliant!
Opäť ti chcem poďakovať za toto veľmi pekné video, bolo tam spústa zaujímavého a poučného obsahu. Tak ten osciloskop, ktorý si si tak pekne opravil ti už vykonáva cenné služby, ako som si všimol, tak to je paráda a teším sa spolu s tebou.
Aj keď nie som elektrotechnik, súhlasím. Tieto videá majú svoju kvalitu. Žiadne nezmysly, žiadna "dráma", proste fakty a opisy, názory, s ktorými sa stotožňujem.
I am at a point were I actually wait for Diodegonewild videos to review these cheap aliexp power supplies. Not that I have any doubts of their expected multiple problems, but just to confirm and see a detailed analysis. Great video!
Thank you. This really helps to save me money and too keep me safe. I looked at this (optically the same) power supply, but the price and specification looked like too much of a bargain. Now I know why.
Young, Yep 21Year Old, Engineering Student from India.. Yep I learnt a lot of things from this channel and i didn't skipped any part of video for even 10 Seconds.
Priceless video, an absolute joy to watch. your "cutting corners" gag was prophetic. Please do a video on restoration of the cassette player, and your marvelous cat is becoming very judgmental.
I always watch the whole video :-). Being almost 40 I immediately recognized the thing you showed at the end: a 3D-printed audio version of the "save" icon! :-). Looking forward to see you repair that tape recorder!
When you hear that ringing noise, it means that part of the voltage range is achieved not by PWM only, but also by varying the efficiency of the converter by varying the frequency - which is meant to be stable at any given ultrasonic frequency, around 140 KHz or so. I would avoid this power supply at all cost. Sadly, it is destined for a loud bang. The people who made it tried various combinations of part values until they achieved the widest voltage range, irrespective of all component constraints. We designers learned a lot of mathematics for a purpose...
i absolutely love your videos.thankyou for takeing your time to teach others.there has been ome things you disasemble with brute force and i have takeing some apart myself and wish i could have showed you .like those high voltage generators from tasers.anyhow great work dgw..thanks again
Great video! What a dodgy piece of crap. I would have been highly shocked if it was NOT total garbage... But it lived up to our expectations... And yes, I watched all the way to the end! :-)
I like electronics so much! Even though i finished different High school i still cant forgive myself that i didnt learn those stuff in elementary school to pass into Electrican Enginnering school :( Still as 21 years old i love to watch those stuff from which i learned a lot!
When you see the spikes and say "Geezess", it's golden...close behind, the temperature of the bottom of the case:"Bloody Hell!" Accurate and meaningful comments!
Many times when you say _"Nice!",_ you mean exactly the opposite ... but there may be many viewers who do not realize you are being sarcastic, and may actually think you are complimenting the design. Great schematic drawing! 👍
I learned most of my electronics knowlage from your videos. I'm 15 and i like tinkering with electronics and arduino. And I'm from turkey and i would like to see more of your bloody long videos :D
i’ve got one of these that i use frequently to briefly test resale electronics with a DC barrel plug. It’s a very nice adapter to have, so i don’t have to go through my whole box of dc adapters. I’ve got all the same issues that you stated here, the potentiometer sucks and it’s rather cheap in it’s build. it seems this adapter can output useable DC to most electronic devices, but very rarely i’ll have stuff not power on with this adapter specifically. then i plug in a normal adapter and it works fine. I think this adapter tends to struggle with inductive loads more.
Potentiometers made in the USA and Asia are usually marked with an “A” for logarithmic taper, a “B” for linear taper, or a “C” for reverse logarithmic taper.
It clearly has B50K on it, which is linear, 50 kΩ. So why would the voltage adjustment be so unusual? Also, this is just a switch mode PSU with modified feedback and a voltmeter. Easy to make at home from some old laptop charger. Much safer, too. This is SYUUPER DODGY!
@@imnotbeluga007 Because it is in the feedback path. Suppose we set the 5.1 kilo resistance at the bottom of the potentiometer to zero. and remove the resistance of 13 kg. Now we calculate the output voltages in three positions of the potentiometer 1- slider @ low: the output voltage will be infinite (theoretically). 2- slider @ middle: output voltage 5 volts 3- slider @ high: output voltage 2.5 volts It can be seen that despite the linearity of the potentiometer, the output voltage is logarithmic. Of course, here, due to the presence of 13k and 5.1k resistors in the feedback path, the logarithmic curve has been reversed, which can be found by calculating the voltage in IC 431.
Pots marked with a B are linear. Pots with an A are log, and those with C are reverse log. Good luck finding a new pinch roller, or, if needed, the play/record switch; for your upcoming "compact cassette player" restoration. Rubber drive bands, lubricating grease and oil shouldn't be too much trouble finding. Maybe finding a usable cassette could pose problems also.🙃 Pinch rollers tend to bulge in the centre with age, which causes the tape to be pushed into the edge alignment guides, which creases one edge of the tape, which renders that tape useless. Been there, done that, while repairing this stuff, back in the '70's. I've always considered the transport/switching mechanism for cassette players and VCRs to be great human achievements. 🙂
I'm 26 and have been watching you since a very long time. I wait for each video with great anticipation. I already watch hours long videos so yours will be welcome as well.
you can make 1hr long videos and i will still watch it from start to end. i have watched every video of this channel from start to end since i had subbed in 2017. the video was something about chinese water heater i think. and the chinese death lantern is also one of my favorite video. back then i was 13 .
Oh yes, very laborious to make must have taken many hours - excellent breakdown of a cheap chinese PSU, I just bought a similar one (for a cheap 15V supply for vintage Toshiba laptop) and the PSU has just push buttons for the voltage, 12v-24v-120W cheap and cheerful but definitely safer than that one with no metal parts for the hands. @ 15V it stays pretty cool to the touch.
Maybe sometime you might try the DIY load mikeselectricstuff came up with: A length of wire in a bucket of plain water! The water does a great job of cooling it and the wire is still a better conductor so you don't have to worry about shorts as long as you can keep the wire from contacting itself. Just need some regulation to keep the current consistent.
34 years old here. Used to do component level repair at a PC shop. I love to see your videos with reverse engineering to keep my knowledge fresh :) The thermal camera shots, oscilloscope readings and full disassembly is impressive. You could probably gain some viewers if you started reviewing current and popular hardware like top selling power supplies on amazon (for example)
Made it to the end, no problems. I have a variable PSU just like that which I have never used and I think it will never be used now. Probably do my own autopsy. At least the barrel jacks are handy to use on equipment connected to either my bench supply or the multitude of switching PSU wall warts that mysteriously multiply in number. Some date from the 20th Century and are made in Japan.
Suggestion: Invest in some Chip Quik "Removal Alloy" for your desoldering. It works remarkably well, on everything from PLCC to chunky through-hole parts.
I'm still here. It was a very thorough analysis. I enjoyed it. For what it is I think that PSU is pretty good. Well. the mains isolation is pretty bad in places. I certainly wouldn't expect more than an amp out of that PSU either. That ripple though. I would have liked to have seen ways to mitigate it. I have put Pi filters on PSUs and that knocks the spikes down a lot. I'd be interested to see Dan's take on it though.
Great video as usual. Now I'm just wondering where that horrible switching noise at the output came from. The only thing I can think of is if that snubber circuit really was faulty from the beginning.
Thanks @DiodeGoneWild for this video , i appreciate the hard work behind these videos. Very rare channel that gives correct information. I have a question that i couldn’t resolve: you state that flyback transformers have always an airgap. Why is so ? Because having an airgap will increase flux leakage and lower the inductance seen at the primary side and these are negative effects. I understand that it will decrease the core saturation considering the same current. But would it be more convenient to lower the duty cycle instead of putting an air-gap to have a better efficient transfer of energy. Can you make a video expressing the physic equations highlighting such a choice? Obviously i went back to my power electronic book (Mohan) but couldn’t figure it out. You would be the first on internet to explain this subject.
Hello. Generally PSU ripple measuring is 50 Ohm oscilloscope input resistance, 20 MHz BW limit, no alligator clip due to its wire, most probes have spring which can be put on instead of alligator wire. How do you measure ripple?
8:40 I know enough about probing to always be suspicious when I am doing measurements like this (but not enough to know when I'm doing it right, haha). I trust that Dan is doing it right, but for anyone who is less experienced than him, here's how you can end up accidentally seeing that kind of noise when it's not really there: At multi-MHz frequencies, especially with power, I worry that I am picking up the magnetic field in the loop formed by the probe and its ground clip. Also with digital scopes when you're operating close to the bandwidth limit you can often have apparent ringing that's actually caused by the scope's sinx/x interpolation and not really present on the true signal. Dan said 100 MHz which is well within the safety margin for a 500 MHz scope, however a digital scope does not always operate at its maximum sample rate! Usually they are nice enough to display the currently used sample rate and bandwidth so you can check. Not to mention, always be sure that your *probe* can handle the bandwidth! Usually to go past 10 MHz you need to be using a 10:1 probe, or a switchable probe in the 10:1 mode. For high frequency, low impedance signals, instead of buying expensive high frequency probes you can sometimes get away with just using 50 ohm coax with a resistor.
![Lp. Сердце Вселенной #60 РОЖДЕНИЕ ЛОЛОЛОШКИ [Финал] • Майнкрафт](http://i.ytimg.com/vi/YoR0pAV9FVQ/mqdefault.jpg)
"What ever might be the best way of opening it, let's just cut into the corner. There's probably a lot of cut corners inside of it anyway" 🤣These are my kind of puns
😂😂😂😂
best electronics youtuber out here
He was absolutely right about that too
Long videos don't bother me, the reverse engineering time spent doing that schematic is appreciated.
Never get tired of the long videos
I am almost 25 years old and i am a newly graduated electronics engineer, i am watching your videos for almost 4 years. I learned more from you than any other teacher or professor at my university, i hope you best in life and wish you make these videos in the future.😊
That must be a horrible university if it is true :/
@Stinktierchen its a nice university but they focus too much on theory also there is little practical work. All they teach Matlab, RF, software and control theory. There is little work done in electronics, power electronics and electrical machines which i am interested mostly.
@@kemalkurt5257 dodgy!!!!
15 years old now, watching for... 3 years? Awesome videos
I love bloody long videos!
Me too!!
You are awesome 😎👍
Yessss!
aww .. no conclusion? again? .. how am I supposed to know if it is super dodgy or just dodgy?
Insulating a human from deadly mains voltage by just a lacquer on super hot wire in baking transformer. I would say it is deadly actually not just dodgy. Also broken rezistor from new or after just a few minutes of use and the temperature during use. You can almost call it fire starter.
@@josifvissarionovich5320One use electrocution device with fire starting capabilities, QC approved
It's pretty sketchy. That transformer was horrible. That switch was a wonder too. Parts sourced from the cheapest Shenzhen has to offer.
Because it is clear... That it is SIIIUUUPER DOOODGYYYY
@@gianluca458 We still look forward to hearing it though.
Dělej svojí práci dál! Jako čech jsem na tebe hrdý a baví mě tvá videa.
17 year old guy, think I started watching when I was... Younger- ish. still watching and interested! Keep the videos coming.
And I'd like to see a restoration of that radio/tape player.
Me too!
18 viewer here, i think most younger viewer like micro controllers more then these obsolete circuit, but i enjoyed both
Beautifully dodgy! Thank you for taking the time to fully test, teardown, and reverse engineer this power supply, I always learn a lot!
Thank you for going all the way with the schematic
29:57 18 year old boy here and been watching you for years now, i used to take apart cassette decks and record players .w.
37 years old here, watched the entire video with no skipping. Loving electronics :)
Yes Indeed I watch your videos till end. Gaining knowledge which my university took years to explain. UA-camrs such as EEVBlog, Fran Blanche, Andreas Spiess, Great Scott, Electroboom, Marco Reps, Ben Eater, Imsai guy. are such a blessing to me for getting such knowledge. Being from the "Tik Tok" generation I still consider myself as a old school guy. Choosing electronics as my hobby was a great decision which saved me from this new fangled generation addictions.
Excellent review and testing of these adjustable power supplies getting advertised of eBay / Aliexpress / etc. Great schematic and explanation on how it works, most interesting. I'm 192 years old btw.
I have a similar power supply, with UK plug. Mine is also about 3v to 30v ish.. No stickers on box, just pressed in markings when the box was formed. I ONLY use it to dim my otherwise bloody bright icicle window Christmas lights. I knock them from the normal 12v down to about 8v, which makes them much better on the eyes and they still look cool.
I think most of us that watch your videos absolutely love what you do, and the length does not matter. If you have something to show and talk about then let it takes a long time, unless you don't want to talk that long lol, I would not blame you. If I may, I love watching your long videos, it is like being there with you as you rip stuff apart and take the time to explain things for everyone :) (I did not mean that in a creepy way lol)
I was 12 when i started watching your videos now i'm 16 and i love your videos. This power supply is a prototype of self dismantling power supply the next ones will be dissoldering components it will speed up recycling🤣
5:00 Your dummy load got a new transistor :O
I'm surprised somebody noticed this detail :). The smaller transistor (BDX33C) got baked, so I put TIP142 into it.
@@DiodeGoneWild How much does the performance increased (about watts dissipation)? Does it run cooler ?
I’m 18 and I have been watching your videos for 4 years. You are an inspiration to young people who want to make a career in electronic; Your knowledge is gold for me. Thank you for what you do!
One of your younger viewers (24) watching till the end here, been your fan for a few years now ❤ love your videos dan!
Im 15 years old and have watched this video to the end once with 0 skipping!
This brings some hope for humankind ;)
@@DiodeGoneWild it sure does! especially since i’ve almost lost hope in humanity lol
29:59, I've been watching your channel since I was 15, now I'm nearly 19 and it's helped me a lot in regards to analogue electronics. Maybe I found your channel due to not having my neurons necrotized by Tiktok/Instagram/whatever normies scroll nowadays. Now that I've won several national and state electronics competitions here in Romania, I'm looking forward to attending electronics and telecoms college, where I'll continue watching your videos :)
I'm 19 years old and thanks to you I got the love for electronics. I've been watching you for a couple of years now and I gotta say that I appreciate your work and I love your cat and dog. This year I'll go to college and study electrical engineering (hope I can make it out) ✌💙
Thanks for this one! I've seen A LOT of people using this sort of adjustable power supply that looks identical but sold under different generic brand names. It seems the appeal of them is they're cheap, easier to use and smaller than a lab bench power supply, easily bought on Amazon with next day delivery and can easily be permanently mounted into something. Always suspected they didn't meet minimum electrical safety standards but good to see it proven beyond a doubt in a teardown. This also explains why people often have issues with the output sagging under load even within the 60W spec or the output ripple interfering with circuits.
A good quality laptop power supply from the e-waste bin followed by an adjustable buck regulator module might be a better option.
Ja, a REAL 60 Watt supply, followed by a decent buck, or one of the buck/boost modules, much safer, better performance, and, if you put it in a case, you can "open up" the laptop supply, for better cooling... even put in a small fan with a thermistor control.
@@lohikarhu734 these days there are even such devices where you plug in a laptop TypeC charger and the device asks the charger for the nearest voltage then buck/boosts it internally to the setpoint. But that is more expensive I guess... And there is also TypeC PD-PPU standard to ask the charger for a specific voltage not a predefined step, as if the TypeC standard is not overcomplicated enough! :P
Is this the power supply Tech Tangents uses sometimes? 😉
@@Petertronic Yeah pretty sure he does use an almost identical one with a comical brand name on stream, but I think he knows it's not of good quality, he just bought it because cheap and Amazon next day, I don't think he's permanently installed any of them in projects at least, he just uses it for temporary testing (I think?).
Sir as u asked, yes youngers too watch your videos very seriously ❤ I'm 23 years old viewer from India and superrrrr excited for the *cassette player* restoration and theory video ❤😊
Thanks ;) it might be the next video ;)
I'm even younger, 17 from Slovakia. Electronics have been my hobby for almost 10 years at this point. Amazing how quickly time flies..
@@DiodeGoneWild I'm 15 watch all your videos
Haha same here. I'm 18 and i love this guy's videos. Been watching for at least 7-8 years & I've learned a lot from him. His explanations are just very good. Also very excited about the cassette player restoration!
@@DiodeGoneWild 😀 ❤️ hm, will wait.. .
There are barely any sources out there from which I learn so much than from your channel! Keep up the incredible work!
Thanks heaps for the great videos, the education and the entertainment.
29:57 16 years old here;), have been watching you since 2023
25 years old here. Watched till the end :)
Nice to see young people here too.
Watched a month ago and just watched the full length again, and both times I was wide awake at the end. I don't find 30:29 too long. But I can only guess a considerable amount of time was spent making it. Definitely worth a second look.
Hello Danyk, 60yo watching from Tasmania. Been watching you for s few years. As an Aussie, I fully approve of the use of sarcasam and you can say “Bloody Hell” in your beautiful Czech accest as often as you wish!
Absolutely LOVE your electromagnetic device …(Wattmeters, Phasemeters, Ferroresonsnt Voltage Reg Transformers and the like) … videos. People these days need to know just how clever our ancestors were with some magnet wire and silicon steel laminations!
Been doing electronics since I was 4 years old (1968)…but the field of electronics is so vast I still learn things I did not know from some of your videos.
In the case of this specific video, watched it all, went over some parts two or three times, read everybit of on screen text…so you know your effort was not wasted. Make my own electronics videos but have not posted up any to you tube yet..so I know how mich effort is involved…psrticularly getting CRO screen or multimeter shots that go with the measurements you are making.
One minor critique…not only of you, but most other electronics you tubers as well…I take mild offense to the term, “Reverse Engineer” because this seems to ligitimize the activities of degree “engineers” eployed at companies whao make all this stuff at the expense of those such as yourself. From what I have seen of what you do, you are far more deserving of the title of “electronic engineer” than many of those working for such manifacturers. Sure, thay are supposed to have learned all the mathematics…but I feel the gulf between theory and practice is still far too wide.
So I use the term, “I am going to Draw The Circuit/Schmatic of this device” to reveal the thinking process of those who designed it and to expose any flaws in that thinking process.
I have drawn the circuits of thousands of pieces of gear, from analog TV studio gear to medical gear to RF gear…that is how I learned most of what I know now and I encourage all the youngsters commenting here to do the same!
Cute little power supply.
Highly recommended to destroy multiple electronic devices that require a stable DC input such as notebooks.
It also functions as an excellent high frequency jamming device.
But wait, it can do more! You can use it as a heater and the fourth and final (literally) function of this 4 in 1 device will be as a lighter.
That 7-segment voltage display is an off the shelf module. I've bought bags full of them at hobby stores. They're often designed for convenience to run off the voltage they're measuring, which explains why it gets dimmer as you decrease the voltage to minimum--sometimes they have a separate supply pin you can use if you don't want to do that. They're not very accurate but they are good for just sticking some kind of indicator to give you a rough idea of the voltage present somewhere.
I really enjoy your videos and although I am into electronics for three decades, I still learn a lot. I may not be the youngest viewer, but 47 is not too old either… 😅
I'm 20 and I watch your videos from 2019 at the age of 16.
Shit i'm getting old quickly😂
Haha, remember that when you turn 40, mate.
Danke!
Thank you!
You showed a lot of your work!
A lot details.
I am fearly screaming for the poti with primary side switch :Ö:
Very good work.
Highly informativ.
The transformer is baked. Baked! ♨️
Nice reference to Shango066 😁
And a nice video as always 👍🏻
Man, si much work you put into the video, it's impressive
I'm 19 and have been watching you for a few years now; you still made me feel really old lol ;)
I'm twice your age and I'm a walking dead ;)
@@DiodeGoneWild I've already turned to dust. Thanks for all the videos. Watching from Hades, you are very popular here amongst the shades ;-)
for me, the best adjustable power supply is always the combination of a well known good PSU (like an old laptop, original repurposed psu) in combo with a buck-boost board. It offers CC, CV, and it's safe because the original PSU is safe and properly isolated. It's so dodgy to control an output of a bench adjustable PSU in the same transformer as the PSU's own auxiliary psu and have to deal with such a mess because of that
I have couple of similar products. Double feedback look probably is the reason why 3-12V version tops potentiometer halfway while 3-24V version adjust after turning pot more than half way too. Brilliant!
Opäť ti chcem poďakovať za toto veľmi pekné video, bolo tam spústa zaujímavého a poučného obsahu. Tak ten osciloskop, ktorý si si tak pekne opravil ti už vykonáva cenné služby, ako som si všimol, tak to je paráda a teším sa spolu s tebou.
Aj keď nie som elektrotechnik, súhlasím. Tieto videá majú svoju kvalitu. Žiadne nezmysly, žiadna "dráma", proste fakty a opisy, názory, s ktorými sa stotožňujem.
I am at a point were I actually wait for Diodegonewild videos to review these cheap aliexp power supplies. Not that I have any doubts of their expected multiple problems, but just to confirm and see a detailed analysis. Great video!
Im 15, watch all your videos💪 best electronics channel
Senin videolarına hayranlıkla bakıyorum, En ufak detay bırakmıyorsun bilinmeyen,
Teşekkürler
Thank you. This really helps to save me money and too keep me safe. I looked at this (optically the same) power supply, but the price and specification looked like too much of a bargain. Now I know why.
Young, Yep 21Year Old, Engineering Student from India.. Yep I learnt a lot of things from this channel and i didn't skipped any part of video for even 10 Seconds.
Memorable quote at 21:30 "What's the isolation distance here? Just about nothing!" ❤
4:49 The transistor in the test load magically changes
Priceless video, an absolute joy to watch. your "cutting corners" gag was prophetic. Please do a video on restoration of the cassette player, and your marvelous cat is becoming very judgmental.
I always watch the whole video :-).
Being almost 40 I immediately recognized the thing you showed at the end: a 3D-printed audio version of the "save" icon! :-).
Looking forward to see you repair that tape recorder!
When you hear that ringing noise, it means that part of the voltage range is achieved not by PWM only, but also by varying the efficiency of the converter by varying the frequency - which is meant to be stable at any given ultrasonic frequency, around 140 KHz or so.
I would avoid this power supply at all cost. Sadly, it is destined for a loud bang. The people who made it tried various combinations of part values until they achieved the widest voltage range, irrespective of all component constraints. We designers learned a lot of mathematics for a purpose...
9:54 This IC is Current Mode PWM Controller OB2263MP, SOT23-6 case.
Thanks :) sometimes these smd codes are hard to decode...
30:00 21 years old watching your videos here, looking forward for your next uploads.
i absolutely love your videos.thankyou for takeing your time to teach others.there has been ome things you disasemble with brute force and i have takeing some apart myself and wish i could have showed you .like those high voltage generators from tasers.anyhow great work dgw..thanks again
I was curious about this type of supply from Aliexpress .... thanks for sparing me the trouble and expense
Great video! What a dodgy piece of crap. I would have been highly shocked if it was NOT total garbage... But it lived up to our expectations... And yes, I watched all the way to the end! :-)
I like electronics so much! Even though i finished different High school i still cant forgive myself that i didnt learn those stuff in elementary school to pass into Electrican Enginnering school :(
Still as 21 years old i love to watch those stuff from which i learned a lot!
When you see the spikes and say "Geezess", it's golden...close behind, the temperature of the bottom of the case:"Bloody Hell!"
Accurate and meaningful comments!
You the best as always, thank you!
Your dog was looking a bit overheated there. Buy him a cooling ice cream. Puss cat, total cool dude, as always 😄😄
Thanks for this video. And i have to say that i just love your accent.
Many times when you say _"Nice!",_ you mean exactly the opposite ... but there may be many viewers who do not realize you are being sarcastic, and may actually think you are complimenting the design.
Great schematic drawing! 👍
I learned most of my electronics knowlage from your videos. I'm 15 and i like tinkering with electronics and arduino. And I'm from turkey and i would like to see more of your bloody long videos :D
What?! Already over? As long a video is entertaining it couldn't be too long.
naaaice video as always!
Danke!
Thanks man!
thank you for your support ;)
i’ve got one of these that i use frequently to briefly test resale electronics with a DC barrel plug. It’s a very nice adapter to have, so i don’t have to go through my whole box of dc adapters. I’ve got all the same issues that you stated here, the potentiometer sucks and it’s rather cheap in it’s build. it seems this adapter can output useable DC to most electronic devices, but very rarely i’ll have stuff not power on with this adapter specifically. then i plug in a normal adapter and it works fine. I think this adapter tends to struggle with inductive loads more.
Potentiometers made in the USA and Asia are usually marked with an “A” for logarithmic taper, a “B” for linear taper, or a “C” for reverse logarithmic taper.
It clearly has B50K on it, which is linear, 50 kΩ. So why would the voltage adjustment be so unusual? Also, this is just a switch mode PSU with modified feedback and a voltmeter. Easy to make at home from some old laptop charger. Much safer, too. This is SYUUPER DODGY!
How do u modify feedback for stability if making adjustable? Just add extra turns to factory feedback? Thx@@imnotbeluga007
As I remember from old days A marking was for linear in Europe, B was exponential and C was for logarithmic potentiometers
@@imnotbeluga007 Because it is in the feedback path.
Suppose we set the 5.1 kilo resistance at the bottom of the potentiometer to zero. and remove the resistance of 13 kg. Now we calculate the output voltages in three positions of the potentiometer
1- slider @ low: the output voltage will be infinite (theoretically).
2- slider @ middle: output voltage 5 volts
3- slider @ high: output voltage 2.5 volts
It can be seen that despite the linearity of the potentiometer, the output voltage is logarithmic. Of course, here, due to the presence of 13k and 5.1k resistors in the feedback path, the logarithmic curve has been reversed, which can be found by calculating the voltage in IC 431.
@@jankomuzykant1844 It seems that this marking is reversed in Europe
Pots marked with a B are linear. Pots with an A are log, and those with C are reverse log.
Good luck finding a new pinch roller, or, if needed, the play/record switch; for your upcoming "compact cassette player" restoration. Rubber drive bands, lubricating grease and oil shouldn't be too much trouble finding. Maybe finding a usable cassette could pose problems also.🙃
Pinch rollers tend to bulge in the centre with age, which causes the tape to be pushed into the edge alignment guides, which creases one edge of the tape, which renders that tape useless. Been there, done that, while repairing this stuff, back in the '70's.
I've always considered the transport/switching mechanism for cassette players and VCRs to be great human achievements. 🙂
Danke!
I watch until the end!!
I like the dog! Great analysis, as always.
I'm 26 and have been watching you since a very long time. I wait for each video with great anticipation. I already watch hours long videos so yours will be welcome as well.
Yes, theory of operation of casette deck (and video) mechanism is always welcome!
It is nice to see your "new" osciloscope on a video.
Yep, even young people from germany are watching your videos :)
I'm 16 and i reaaaally love watching your videos :D
29:50 watched the whole thing. Very entertaining video and great explanation of the schematic. Keep it up 👍
Very nice Thermal camera!
you can make 1hr long videos and i will still watch it from start to end. i have watched every video of this channel from start to end since i had subbed in 2017. the video was something about chinese water heater i think. and the chinese death lantern is also one of my favorite video. back then i was 13 .
15:26 *accidentally summons the devil*
Super bloody interesting. Keep them coming.
Thx for your work, all your videos and schematics dear DGW. Great! God bless you!👋👋😌
30:18 I'm in my bed and didn't even fell asleep. 😅
Thank you for your detailed videos
Oh yes, very laborious to make must have taken many hours - excellent breakdown of a cheap chinese PSU, I just bought a similar one (for a cheap 15V supply for vintage Toshiba laptop) and the PSU has just push buttons for the voltage, 12v-24v-120W cheap and cheerful but definitely safer than that one with no metal parts for the hands. @ 15V it stays pretty cool to the touch.
Maybe sometime you might try the DIY load mikeselectricstuff came up with: A length of wire in a bucket of plain water! The water does a great job of cooling it and the wire is still a better conductor so you don't have to worry about shorts as long as you can keep the wire from contacting itself. Just need some regulation to keep the current consistent.
34 years old here. Used to do component level repair at a PC shop. I love to see your videos with reverse engineering to keep my knowledge fresh :) The thermal camera shots, oscilloscope readings and full disassembly is impressive.
You could probably gain some viewers if you started reviewing current and popular hardware like top selling power supplies on amazon (for example)
At 17:46 you are measuring the ESR of both output caps in parallel. So maybe 90mR each.
The controller chip is a OB2263.
Made it to the end, no problems. I have a variable PSU just like that which I have never used and I think it will never be used now. Probably do my own autopsy. At least the barrel jacks are handy to use on equipment connected to either my bench supply or the multitude of switching PSU wall warts that mysteriously multiply in number. Some date from the 20th Century and are made in Japan.
No problem for 30mn vidéo ! I like it !
Suggestion: Invest in some Chip Quik "Removal Alloy" for your desoldering. It works remarkably well, on everything from PLCC to chunky through-hole parts.
I'm still here. It was a very thorough analysis. I enjoyed it. For what it is I think that PSU is pretty good. Well. the mains isolation is pretty bad in places. I certainly wouldn't expect more than an amp out of that PSU either. That ripple though. I would have liked to have seen ways to mitigate it. I have put Pi filters on PSUs and that knocks the spikes down a lot. I'd be interested to see Dan's take on it though.
Great video as usual. Now I'm just wondering where that horrible switching noise at the output came from. The only thing I can think of is if that snubber circuit really was faulty from the beginning.
24:27 От такой подробной схемотехники я даже удивился. 👍
so much to learn here! thank you!
Thanks @DiodeGoneWild for this video , i appreciate the hard work behind these videos. Very rare channel that gives correct information. I have a question that i couldn’t resolve: you state that flyback transformers have always an airgap. Why is so ? Because having an airgap will increase flux leakage and lower the inductance seen at the primary side and these are negative effects. I understand that it will decrease the core saturation considering the same current. But would it be more convenient to lower the duty cycle instead of putting an air-gap to have a better efficient transfer of energy. Can you make a video expressing the physic equations highlighting such a choice? Obviously i went back to my power electronic book (Mohan) but couldn’t figure it out. You would be the first on internet to explain this subject.
we would like to see you make an upgrade to this psu. maybe by changing some parts (caps/inductors) and some heatsinks it can be better!
Hello. Generally PSU ripple measuring is 50 Ohm oscilloscope input resistance, 20 MHz BW limit, no alligator clip due to its wire, most probes have spring which can be put on instead of alligator wire. How do you measure ripple?
8:40 I know enough about probing to always be suspicious when I am doing measurements like this (but not enough to know when I'm doing it right, haha). I trust that Dan is doing it right, but for anyone who is less experienced than him, here's how you can end up accidentally seeing that kind of noise when it's not really there:
At multi-MHz frequencies, especially with power, I worry that I am picking up the magnetic field in the loop formed by the probe and its ground clip. Also with digital scopes when you're operating close to the bandwidth limit you can often have apparent ringing that's actually caused by the scope's sinx/x interpolation and not really present on the true signal. Dan said 100 MHz which is well within the safety margin for a 500 MHz scope, however a digital scope does not always operate at its maximum sample rate! Usually they are nice enough to display the currently used sample rate and bandwidth so you can check.
Not to mention, always be sure that your *probe* can handle the bandwidth! Usually to go past 10 MHz you need to be using a 10:1 probe, or a switchable probe in the 10:1 mode. For high frequency, low impedance signals, instead of buying expensive high frequency probes you can sometimes get away with just using 50 ohm coax with a resistor.