You are a Lovely man. No one has ever designed an electronic project in live stream, That was great

That's how the things have been done in my youth...audio amplifiers, guitar effects, radio receiver, all kind of preamps and sound generators! I still have the paint pen I used for drawing the boards with leather paint ...but I used Clorhidric acid and Perhidrol...finally, you did a great job, appreciate !!!

This is the way I design and build my electronic projects....thank you for all!

Nice electronic demonstration brave man nobody have the courage to do an electronic project in live stream , you did it .

Why haven't I found this channel before? This guy is amazing!...best teacher EVER!

Now we see all your life, experience, i'm 62. We learn the hard way. Not like the young people today they have everything already made in their hands lol. I remember when i was young too we had to build the board and circuit completely like you did today. I was in the Canadian armed forces at the time taking my electronic course. It was in 1979 lol. Thank's Sorin and keep up your wonderfull work. You're a very passion man and a good hearted man also. Thank's again.

That's the art of diy electronics! You dont need schematics and program to draw the circuit. You just think what do you want and you start making it. If you keep making this kind of videos i promise to keep watching! Good Job Mr. Sorin!

I love this video!...They say that it's when things go wrong that we have the best opportunity to learn.

even if I could not attend your broadcast this morning, I've seen it right now in the evening. What really adds up in your videos is the fact that.... *you don't hide beside fails*... tha'ts really GREAT, man. Thanks Sorin for sharing all this AND for...your dodgy style, which demistifies lots of super-high-tech electronic "scientists" here around around the web! As you stated at the beginning of this power supply project: ...You don't make BOXES !!! :-)

Nail painting! Things getting easy when you know the easy way. I learn so much.

Absolutely loved it and when it blew up you was not deterred but just carried on to find out the problem brilliant I love watching your videos

i was doing this like 25 years ago with father he reached me on some boards for fun when I was younger. I was using just normal black marker it was working perfect and than acid and after it clear board ! Damnnnn you bring me some good old memories back ! Muck love from Serbia !

Awesome practical lesson Mr Sorin! Thanks

Sorin is a professional electronics guru i just discovered this amazing tutorials am now happy to advance my knowledge in electronics. Nairobi, Kenya

Remember seeing a lot of those small relays in amps or very similar, pretty sure they still are using these relays a lot in house amps/receivers for different things including multi channel speaker switching to turn output on or off as needed depending on audio profile you're using, stereo vs 5.1 etc. I here my onkyo tonking away quietly when I first power it up and when I'm changing things around in audio profiles. Something rather satisfying about quiet but solid sounding tiny thuds of relays switching in an amp makes me think high quality components even if they are a fairly cheap part taking the effort to incorporate them into the circuit makes a nice touch 😊

Sorin, you are a legend. I have poked a little fun in the past but was only in jest and will again. I remember commenting that only you could could fix an iphone with 3 amps and petrol. haha.And i really laughed a lot when someone sent you the hot glue hero thing. But honestly your approach to fixing "the things" is unique and unorthodox. You have over 100,000 subscribers that are well earnt and i see it hurts you when you get a few dislikes. But at the time me posting this comment, you have 7 dislikes, and 510 likes. Thats a big WOW my friend. Think i might said before, but when you posted a video about moonlight sonata (november 11th 2017 if any wana see). It touched me and felt i knew you. Please do not change or ever stop posting videos. I have learnt so much from you. I love the soldering iron your using too. I have one of them. Was tempted to do a spoof video of you fixing an iphone with that iron a petrol can, hot glue, and Amps. Thought it might make you laugh. But being serious. Your channel is amazing. You're so knowledgeable. I for one are glad that i ever found your channel. If ever i am over your way. Would love to buy you lunch!

Europe. Africa. Asia. South America. North America. Australia. You are educating the World!

Amazing and in details explained project! Thank you Sorin for taking your time and teaching the world. Much respect!

I don't find it boring at all its very informative and interesting I've never seen that done before 👍

Thank you Sorin, I had seen before a year a go but I also see it again and it is interesting. Thanks!!

Thank you for the memory of making PCBs with ferric perchloride and indelible ink; very good work, Teacher and that circuit, it works perfectly, greetings from South America.

Thanks sorin, I love this tutorial, I have learned alot, and I am more bolder now to build things

Sorin! Aaron from the US. I have watched a great many of your vids and they have been wonderfully relatable and extremely helpful over the years. Thanks again!

Hi Surin. Thank you. It's very interesting to see how it works. It really is very difficult for me. I didn't learn electronics at all, but through your broadcasts I learned a lot ..... I am developing my own cellular and computer business so it helps me a lot. Thank you. Sharon.

the best linear power supply progect ever.only from professor.whith circuit protection.this is a linear power sapply 25volt 5ampere.thenks sorin for your time.

When I was young, I made PCBs the way you showed. I used tar dissolved in laquer thinner. It dried quickly and covered the copper of the PCB in a good way, it was etch resistant. Later I used an Edding 3000 pen and a ruler. This gave nicer results. But I didn't like the way the PCBs came out. In my opinion it wasn't tidy enough. Also if you needed two or more PCBs, it was a lot of work, so later I switched to PCBs with photoresist and a PC layout application. I still make my prototypes at home this way!

Your wonderful Sorin, Love it.

Never thought of nail polish + remover. Love it.

Thankyou very much for what you have done.

Sorin. You're a brave man! One thing I learned in the 30+ years in computers and electronics is NOT to do live demos. Please don't stop. I love your videos. A kindred spirit. Thanks. PS. I did laugh a bit though.

Oh thanks so much for your contribution to the internets! :D

I´ve just bought all the parts, I´m about to make my own linear power supply following these couple of videos

Professionals often are afraid of sharing because they would expose themselves to other ( concurrents) . Then what I discovered after more than 30 years trying to get in the "secrets" of my job is that often the limits of knowledge are lower than you supposed, so not saying a word avoid contradictions and criticism ;)

Sorin repairs his own circuit...love it...lol

Hello, Thanks for that, brings me back to my C&G 224 P 1,2 and 3 in the 80's. Making PCB;s like that. I think we used Sulphuric Acid, much more dangerous. Ah the good old days, with home made PCB's and Vero Board.

I laughed soo hard on that smile after the smoke.. Hahahaha..

We love you Sorin!

Nice work Sorin you helped me solve a powersupply problem i had it was the transistor on a 30v 5A robot mower charger

Perfectly explained

I worked for a guy that couldn't stand that my PCBs worked first time, every time. He didn't realize that was after many years of boom, pop & smoke. 🤣

hello master sorin you are the best electronics man

3:20:25 I know that feeling

Wow just found you proper job learning so much best show on earth rob xx

Marvelous sorin you are very very best always 🎉🎉🎉🎉🎉❤️❤️❤️❤️

Thanks for the everything.You took the the challenge as usual.God bless you.looking forward learn apply cooling fan with dynamic rpm and etc.Thanks again. :).really appreciate if can you can you draw a finalized schematic diagram next episode.

Great vid. People might use instead of Volt/Amp meter only a voltmeter that shows volts and amps by toggle switch. Just to make more cheap but effective. One position of a switch will measure volts on the output, the other position will measure voltage drop on the one ohm resistor 25w (current sensor). Voltage drop across one ohm equals amps I=U/R. Power rating of a resistor P=I² x R, so for 5A 1 Ohm it's a 25w resistor, OR 5 x 5w, 5 Ohm in parallel.

Short circuit protection is fantastic

longest movie I've ever seen. Oscar for special effects goes tooooo....Sorin !!! 😝

Thanks brother good repair

Great job! Can you make a video for the protection circuit and how it works? And the capacitor change why it fixed the problem? Keep up the good work, you are a honest decent polite electonics guy.

i wacth you your video and it was so amazing for to recall my elictronics days ,, even now i learn a lot from your video ,, im from philippnes..

I like your red led indicator light on your soldering gun

sometimes it is not the cost of buying the power supply it is the whole purpose of a hobby to do it yourself. whether for the experience or the knowledge to do it.

hi Sorin.. this is zenki from the phil. im such a huge fan of yours and would like to thank you for all the things i've learned from you.. you have been such a blessing to me.. specially during this pandemic because i was able to apply the things ive'd learned and turn it into a livelihood.. god bless you.. and may you inspire more people to get into electronics repairs

3:20:23 Sorin: let's see now transistor: let's burn now 😂😂

I love this........live electronics

Thanks. Great show. I'll add the short circuit protection to my ice cream container power supply. And it makes me wonder why for a dollar worth of parts the power supply u bought didn't have it. It's crazy.

Hello Master, greetings from South America

Thank you so much wow ❤

Perfect 👌

Hi sorin enjoy your videos i would like to request and i think it would benefit other viewers, if you can draw over the schematic with the values so so we newbies can try making this power supply. thanks again for the time you take to explain and clear things up God bless.

Awesome job, and dammit man, I want that T-shirt, "Where's my Mosfets?"...lmao thats rich, Thanks for passing along knowledge Sorin

Despite of being 3+ hours into it, you keep on going until the fault has been found. Nice job. It was an interesting problem: the base of the small NPN of the short-protection circuit would reach max 0.7 volts, and at only the slightest drop of that voltage, it would stop conducting and allow the zener voltage to go up, causing the relay to shutdown the output. That's why it needed a quite big capacitor. Such faults are hard to find. There is already a capacitor, so you know that the reaction is slowed down. But in this case, the first try of the capacitor was too small. The relay switch: if the common pin is at the supply side and the normally-close pin at the output side, you can connect a short protection indicator LED to the normally-open pin of the relay. If your relay is in the opposite direction, you cannot do this indicator. And you cannot swap the pins easily, because it is on a PCB. That's why I love to build such stuff in mid air. When it is all done, it can be isolated and made stronger with the help of hot glue, or, transferred to a PCB, if you need to make more of them. PCBs are good for mass-production. Not for prototyping.

Nice work

very helpful video thank you Sorin. One more question for parallel mode transistors is there any limit how much we can use? Greetings from Bulgaria

amazing as always , fan control next time!

its been long i have watched you miss you you rock!

Hello! Thanks for the explanations. I understand you even if I'm not an electronician. Interesting way to make a PCB. Why didn't you choose a PCB for prototyping with the holes already made?

super nice

I love your patience I'm trying to have it rub off on me

thanx for this video series. even if it is almos 4 hour long it was very interesting. i learn a lot. i have a question. in video at 36:57 you said that you want capacitor between emitor of BD139 for current limit and ground. but you didnt tell why. same with cap over zener diodes.

Nice one

Cu2So4 is copper sulphate if i am not mistaken

Because of protection circuit it is shorted then if your RC constant it is high, then your RL output shorted before completing RC constant reach max It is ocuurring your RC canstant resetting becuase of output short condition(no current flow to protection circuit base) so 1ohm->RL current flow in state protection circuit Zero volts so your C value it is needed more less than 1uF Also Before problem it is not completed state it is still adaptable becuase of your output short and then open output and after your RC constant time over and then RL continue connection it is to able to output Voltage and cuurrent well.

The two common ways of etching: Nitric acid and copper : 4 HNO3(l) + Cu(s) ==> Cu(NO3)2(s and aq) + 2 NO2(g) + 2 H2O(l). The solution Sorin is using is Ferric Chloride Acid: which changes the Copper Solids to Ions like this 2Fe3+ + Cu (solid) 2Fe2+ + Cu2+ . Sorin could have sped up the process by removing the board rinsing it in water and then proceeding this would remove the precipates slowing down the reaction.

Hola 👋 bien hecho !!yo en lo personal uso un plumón de tinta permanente (no para pizarrones) para hacer el trazado ..y pongo el pcb en un recipiente vacío con el dibujo hacia abajo y vierto el ácido cuidando de que al pcb no le caiga por encima para que este comience a flotar ..mover con cuidando que no se sumerja hasta que se realice el tallado del cobre en el pcb... luego limpio el cobre con una lana de acero para lavado de ollas .. el resultado es mas rápido y menos complicado y se logra un buen acabado..😊

Nice.👍🏻 Sorin, can you get this level of protection also add to the power suply that you have purchased. I also have a powersuply that is well protected, but unfortunately, the voltage and the amps will not be zero. Please make a video how to customize an existing powersuply with this security.

Since your power supply doesn't support more than 3 amps, why not adjust the short-circuit protection so that it triggers at 3 amps? Would that be possible? Maybe by choosing carefully the values of the resistors controlling the switching transistors? Or using a normally open relay?

Hallo sir thank nice sharing

🎉🎉🎉🎉 muito bom o projeto meu amigo e a explicação também

I tried building like this..but I used lm317 and 3 tip3055 transistor...the problem is i cant control the current..instead i add a fix current control resistor..but I like yours more...

Very nice information thanks sar ji 🥰🥰🙏🙏🙏

do you not need a back emf diode across the relay coil to protect the drive transistor?

I guess it's ok, and it works! But, the time and effort you put into this you could have got it much smaller and neater by using brown wrapping tape. You cut strips out and create a negative space to create the traces. Color it in with pen/paint and then remove the tape. Now you have a near perfect looking PCB. Use tinner to tin the pads, and then follow up with UV solder mask. You can get professional looking hand made PCB's that can be used for SMD components. It's an artform for sure, but one I've had to master because CNC's are expensive, and JLC isn't useful when I need a prototype now. I get better results doing this than I do with the photosensitive method and a printer. Plus, doing it by hand is part of the fun and the reason for doing it.

Do practial video about MOSFETS. How to connect them, use resistors with them etc

excellent:):):):) Could you made one wideo with searching short circuit. How do you find on board

When the transistor turns on you're applying 35v on the relay?

You are my King

Question. is there a circuit for taking in a sound in one hertz and outputting it in another hertz?

PICASSO ELECTRONICS

lets have a silence minute for 1 part RIP power supply :D

Sir is the switch side of the relay is where the fan motor is connected? tnx sir thumbs up done

Is BD237 powerful enough? In the specs it only stands 35 whatts, but if it must transfer the shorted current that pass through the relay, there is more like 80 to 120 whatts no?

Which component can I use instead of AZ1143-04F?

shall i use 220uf caps of 25v though my power supply output is 30v 5 amps?

I think at 30 minutes in the guy commenting was talking about using veroboard not breadboard. Veroboard is nice enough to use and is permenant.

Sir i like your videos and how to check mobile components with multimeter shorting components

I'm only at 3:09:00 but I am ask myself, you buy a power supply to rip out the shortcircuit protection. So 'we' can use the current limiting to find a shorted component. Why add a shotcircuit protection if you have current limiting in this ps? Also: high quality explanation worthy of the titel 'school' And if you heat the ferric acid to about 30 - 35 celsius 86 - 95 farhenheit it wil be much faster.

What's that liquid lacquer called? Used it so many times but never knew how it's named.

voltage regulation method with Zener diode is not working also sorin, you can see it directly in 3:02:40. when you are talking about the short circuit protection circuit !