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

Testing a 3-36V 60W adjustable switching power supply KJS-1509 made by Kejiesheng. It's in a laptop power supply shaped box with a potentiometer and a built in 3 digit LED display voltmeter. Let's see if it's any good, what's inside, how safe (or dangerous) it is and how does it work, including the full reverse engineered schematic.

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[superdau]

"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

[Gengh]

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

[VVerVVurm]

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

[viktorsak]

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

[williamjohansson]

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.

[wolfrobben]

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… 😅

[germoneyx]

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

[BRUXXUS]

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

[RanaRao_Chandrachur]

Sir as u asked, yes youngers too watch your videos very seriously ❤ I'm 23 years old viewer from India and excited for the *cassette player* restoration and theory video ❤😊

[BritishEngineer]

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.

[brainwayOf]

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

[josephking]

I bought one of these just so I could try and revive lithium ion batteries that had the voltage drop too low. Never got it to work doing that and I have never used it and after this video I think I will retrieve the heat sink out of it and toss it in the recycling. My purchases of chinesium electric and electronic products has dropped to *zero* after I was fortunate enough to stumble across this Channel and watch these videos.

*THANK YOU* for showing / teaching me how to keep my family safe. ❤❤

[cydia]

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

[borisdg]

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

[d.k.]

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.

[DuroLabs]

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

[dyd]

Thank you for going all the way with the schematic

[roberter]

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

[DiaconescuAlexandru]

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 :)

[mikemccormac]

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