3-36V 60W Adjustable Power Supply (with schematic) 

"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

aww .. no conclusion? again? .. how am I supposed to know if it is super dodgy or just dodgy?

Long videos don't bother me, the reverse engineering time spent doing that schematic is appreciated.

I love bloody long videos!

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.

Never get tired of the long videos

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 ❤😊

5:00 Your dummy load got a new transistor :O

37 years old here, watched the entire video with no skipping. Loving electronics :)

Dělej svojí práci dál! Jako čech jsem na tebe hrdý a baví mě tvá videa.

Beautifully dodgy! Thank you for taking the time to fully test, teardown, and reverse engineer this power supply, I always learn a lot!

One of your younger viewers (24) watching till the end here, been your fan for a few years now ❤ love your videos dan!

I'm 20 and I watch your videos from 2019 at the age of 16. Shit i'm getting old quickly😂

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!

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.

25 years old here. Watched till the end :)

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)

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 :)

Memorable quote at 21:30 "What's the isolation distance here? Just about nothing!" ❤

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

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.

29:57 16 years old here;), have been watching you since 2023

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...

There are barely any sources out there from which I learn so much than from your channel! Keep up the incredible work!

15 years old now, watching for... 3 years? Awesome videos

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🤣

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.

Yes Indeed I watch your videos till end. Gaining knowledge which my university took years to explain. RU-vidrs 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.

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.

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) ✌💙

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.

Senin videolarına hayranlıkla bakıyorum, En ufak detay bırakmıyorsun bilinmeyen, Teşekkürler

Super bloody interesting. Keep them coming.

Thanks heaps for the great videos, the education and the entertainment.

Thx for your work, all your videos and schematics dear DGW. Great! God bless you!👋👋😌

naaaice video as always!

Thank you for your detailed videos

You the best as always, thank you!

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!

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. 🙂

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.

4:49 The transistor in the test load magically changes

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!

I like the dog! Great analysis, as always.

29:50 watched the whole thing. Very entertaining video and great explanation of the schematic. Keep it up 👍

30:00 21 years old watching your videos here, looking forward for your next uploads.

I'm 19 and have been watching you for a few years now; you still made me feel really old lol ;)

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!

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!

so much to learn here! thank you!

Thanks for this video. And i have to say that i just love your accent.

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.

The transformer is baked. Baked! ♨️ Nice reference to Shango066 😁 And a nice video as always 👍🏻

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

No problem for 30mn vidéo ! I like it !

It is nice to see your "new" osciloscope on a video.

Great content.

Yes, theory of operation of casette deck (and video) mechanism is always welcome!

I was curious about this type of supply from Aliexpress .... thanks for sparing me the trouble and expense

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!

nice work

What?! Already over? As long a video is entertaining it couldn't be too long.

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*

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! :-)

Very good vidéo. I have this kind of alim and I like it , just for low power of course .

Very nice Thermal camera!

9:54 This IC is Current Mode PWM Controller OB2263MP, SOT23-6 case.

Im 15, watch all your videos💪 best electronics channel

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… 😅

In this video bro really gone a total rabbit hole ☠️

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.

Danke! Thanks man!

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.

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.

I love your Accent ❤😍

Cassette tapes invented in Eindoven 😊

"10 seconds of attention absolute maximum rating" 😂😂😂

Nice dodginess :). Looking forward to the restoration :)

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.

This is absolutely bonkers

Danke!

Please make more long videos like this one. I hope that you will make a 2 hour long unedited video

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.

Im 24 and i watch all of your videos

Always a great pleasure to watch your product reviews of chinese hightech. :-) It would be great to also measure the efficiency at half the claimed load (What input wattage at 30V 1A?).

Super !

Do that tape deck man, I’d love to see that.

Watched the whole video, didn't even blink, i guess i am crazy😅

Your dog was looking a bit overheated there. Buy him a cooling ice cream. Puss cat, total cool dude, as always 😄😄

Nice.

Thanks for the video, really intresting. Can you do a video on the active full bridge rectifier & graetz bridge rectifier( bridge rectifier with capacitors on each diode )

something like this would be really useful, if well done.

Definitely, this is one of the most dangerous power supplies i have ever seen. Bloody hell! 😱😱😱😱

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.

Nice video. Would by interesting to see the power supply ripple with 20 MHz limit set on the oscilloscope.

yea younger ones also watch since it is great to see how to and how to not to resign stuff + old designs were very interesting since it is not 1 magic IC and then a few passives.

I'm 8 and a half and have been following you for 10 years ! your very funny and I hope you fix the toaster you showed at the end Bye Bye !

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!