Finally, the power supply arrived ..... Part 2
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- Опубліковано 17 вер 2019
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Please don't take down this Channel.. Please.. This is the only Channel worth watching to learn Repairs and something else.. Thank you Sorin..
Ivan Sarmiento clearly you haven’t seen Rossman Repair
@@aqib2000 Rossman only repairs MAC and allways using Schematics. It's OK but not as usefull as Sorin repairing.
Alan Hernandez principles are exactly the same mate
@@aqib2000 most of Rossman work is on Apple's computers,he can't work without schematics like sorin
Constantin Ionescu give Sorin simple iissue with the SIO chip and he doesn’t know how to reprogram it...
I followed this channel for awhile now, I dont usually comment on videos but this time I felt I had to do something.. let me tell you
DONT you dare worrying about the comments you hear Sorin, seriously please keep going with the channel, we would love to have more lessons from you and shop workflow because it shows the reality of the job!
also, I personally would love to see what you see, I would appreciate a lesson where you show us how you identify components (how do you know what is a diode, a mosfet, a transistor, a resistor and an smd capacitor) and of course how do you recognise what the connection between the components are :)
I love what you do, unfortunately some people dont appreciate how much knowledge you have and that they are getting all of this FOR FREE .,
never stop doing what you doing
+1
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I could not find a better channel of electronic repairs than yours Sorin.
There is diodegonewild
there is non better education wise.
Take no notice Sorin. Keep the video's coming. Your channel is excellent
i guess in electronics, no matter how complicated the design is, you still go back to the basic and general rules. OLD SCHOOL STILL ROCK!
I apologize for all slow people or brain dead ......sir you are doing great job thank you.
i think people confuse the "current limiting function aka CC" with the "short circuit protection function"... those two are not the same thing.
A short-circuit protection is in fact a cut-off of the output voltage and current to protect the connected equipment otherwise you
will keep pushing 5A into the equipment until smokes comes out. [because there is a short]
A current limiting function is keeping the voltage to the preset value until the current draw goes to the maximum that you preset then the power supply goes into CC - constant current mode and voltage start to drop according to ohm law U=R*i where 'i' is constant but no short is present.
It is probably easy to confuse the CC mode with short circuit protection because you may ask yourself : At what point the power supply with CC mode is considering a low ohm load as a short? at what value? And probably the answer has something to do with the voltage drop difference.
If the voltage drop is to big then the power supply may cut-off the output and consider that the load is a short.
A power supply with CC mode but no short-circuit protection keep pushing amps into the device you connected until it's melting and goes into fire. The power supply is ok because it went into CC mode [max 5A] but that doesn't mean it has SC protection - your device is melted so where is that protection?
This is probably the best comment. To cut costs I think the idea is you set up your current limit before you test stuff rather than have the more expensive feature of short circuit protection. Short circuit protected means it won't go bang when you short the terminals; instead it current limits to 5 amps! What I mean is they are being somewhat economical with the truth!
@@armunro The 5A is maximum, the SC current is adjustable in CC mode. This is just a built-in solution in Power supplies today, and it is a more advanced function than Sorin is making when he hacks into the HW to get rid of the SC protection. READ the manual, Sorin laughed at the manual, he should have looked through it, everything is explained.
@@torem2538 You are right
@orange11squares
You are Absolutely correct. Best comment I've seen. Everyone that's disagreeing is not understanding CC is TOTALLY different from short protection. CC mode is only limiting the current while shorted. Short protection will kill the power no matter what the amps are set to. It's a basic understanding.
@@shawntyson8 I think you should watch the video again. What's the point of it just shutting the power off other than for if you connect the wires the wrong way around. You need power, it helps finding the short.
Thanks Sorin, you are amazing. Thanks for teaching, learning so much. Appreciate you
Thank you for following up with Honest and teaching the channel as I certainly not an expert. Much appreciated as always
Hi Sorin, very clearly explained for new starters, thank you.
Look. It is your channel. If someone does not like what they are seeing, they can play something else.
You are doing a good work.
I can only thank you for your incite and advice
All the best
I saw your video on yesterday, and I couldn't wait to see your follow-up today. You did not disappoint. Good Job!
Sorin you are a really great guy. Thank you for the patience you had explaining the short circuit protection to all your negative commenters of yesterday's video. Hat's off to you !
Salut Sorin!Esti un om cu foarte multa experienta in domeniu si tot ce faci pe acest canal este de calitate.Sa nu uite cei care comenteaza negativ sau te jignesc,ca tot ce faci pe acest canal este gratuit.
Thank you Sorin.
You are doing great explaining to the people that think that it is protected when the voltage drops.
No way that’s no protection.
See you soon again with more from your experience and explaining how it works.
Best teacher i ve ever seen on UA-cam
Experience too much.
I trust Sorin never do anyhow video
Dear Sorin, you are absolutely right. There’s no short circuit protection in this power supply, there is only a current limiter possibility. Keep on rocking.Love your videos they are very educational. Thumbs up
Very good idea to build a power supply
Khal Khal not worth it. It's complicated and very time consuming. You have to source the parts too and it will be much more expensive in the end.
@@Todestelzer I disagree about it being complicated, a nice linear power supply was never complicated to build and is bulletproof and easy to fix if you happen to break something. Sure it might be time consuming, but it's good for practice. I do agree on it being more expensive, because transformers can get pretty pricey, tough you can get very powerful ones for very cheap or even free if you salvage it from a broken home audio amplifier.
R4MP4G3RXD it depends.
You maybe want a reverse voltage protection. A simple diode is no good.
You want 10 turn pots (expensive).
3-5 amps Transformer also expensive.
You need 2-4 power transistors and a big heat sink and 1-2 fans and a temp regulation for the fan speed.
Now you are maybe at 70-90€ worth components without a housing for it.
For 90€ you can get a linear PSU with a digital interface and OC dropout protection.
In my opinion it’s not worth it.
But if you want to play and learn how to build a PSU do it. It’s a nice project.
@@Todestelzer an ideal diode isn't such a big deal to implement, but you can find good circuits online and miss the thinking part and as I just said powerful transformers are pretty cheap if salvaged from audio amplifiers, those also have powerful transistors (most likely some of them are good considering that the amplifier is bought faulty for parts) and big heatsink(s) too
@@Todestelzer and you can also use a fine and a corse adjust pot instead of the multiple turn and it would be cheaper by a small amount.
And even if you don't save much in the end because salvaging is for the weak, puting together something is very good practice and if you did something wrong it's good practice to troubleshoot also.
Thank you. I didn't get it either, until you showed the known good power supply. I have never seen a complete short before, so I was confused too. You have performed a valuable public service. Thanks.
How mature of you to not hold a grudge. Thank you for all you do!!!
now i undertand what you meant thank you for videos we learn a lot keep on doing you are a excelent teacher
Excellent! I wish I had had a teacher with the patience and knowledge as you, Sorin, when I was in school in the 50's. Not to say you missed your calling but it is a shame your not able to teach full time, with "repair projects as aids."
Thank you for your time, effort, knowledge, AND PATIENCE.
Even retired from a lifetime of electronic design and repair, you are a welcome part of my day.
I got the same and like it.
Thanks for analyse.
I enjoy!
I commented on last video and now this video cleared up my confusion, now I get your point and what you were trying to achieve. Much better explanation in this video.
you are such a great teacher you explain everything in detail to an understandable level even for the first time leaners
Thank you for your videos mate. You are helping me too much in the beginning of my car electrician life
Sorin, your videos are great, thank you for all your effort, please keep them coming.
I think it may be helpful to clarify Constant Current (CC) and Over Current Protection (OCP) in bench power supplies for those looking at purchasing or even making a bench power supply.
"Short circuit" protection is a notional idea from the power supplies point of view. As long as the power supply has suitable current and voltage ratings what may be considered a short in one situation can be a working low resistance, high current load in another.
CC (constant current) mode should deliver as much current as the load can draw up to the CC setting (or power supply limit) and vary the voltage as required to suit the load resistance.
OCP (Over Current Protection) should switch off the output when the load current exceeds the OCP settings.
On better power supply both can be active (it makes sense if the OCP is greater than the CC setting).
I think the later (OCP) is what is being referred to as "Short Circuit" protection.
A big thank you, Sorin. I learn something today. Please don't stop.
i am eager to learn more about power supply from you....thanks sorin.
i plan to buy PS.. this video is very informative. before this i have no idea how short circuit protection work on PS. thanks mr. Sorin! 🙆♂️
An idea for this power source: make a short-circuit protection, which can be activated or deactivated. That will be nice to learn!
Turn down the amps to protect your circuit. Turn it up to make a toaster.
It's a feature.
i have learnt alot from you Mr. Sorin...we are all together behind this channel for whatever experience your giving to us...ignore every bad comments try to do on the way you thinks is good and simplify your work flow....you are the reason am using power supply on my workshop which simplified my work on troubleshooting motherboard
Brilliant work Sorin! Thank the Lord for people like you. Once my friend! Keep up the brilliant work.
Looking forward to the power supply build.Great videos.Learning lots.Cheers Sorin.
Apreciez ceea ce faci.
Mult succes!
GOOOOO, SOOORIN! Just keep going teaching electronics!
Hi Sorin
If you read my comment from the first video I think I was perhaps the only person to understand exactly what you meant.
I'm older than you and have experienced just what you talk about.
However, the manufacturer of the new power supply is not wrong (or lying) because they are referring to the power supply being protected from damage due to shorted outputs and not the equipment under test being protected.
In the old days power supplies would blow up (exactly as you describe) because the early transistors and transformers were not capable of supplying high current at low output voltage.
So manufacturers added circuitry and usually a relay to cut the power and protect the power supply from damage.
Modern power supplies have much more robust components and are able to supply high current at low voltages without being damaged so the circuitry you are used to having is no longer needed to protect the power supply.
There will be some thermal protection to cut power if the short circuit is present for a long time and the new power supply overheats but often this condition is never achieved.
So the manufacturer is correct; the power supply is protected from being damaged due to short circuit - it has short circuit protection.
You, and other older engineers, use the different type of protection circuitry of older power supplies to help protect the equipment under test.
This was never intended by the power supply manufacturers and is an accidental "extra feature" of older power supplies.
So you are not wrong in how your older power supply works and the manufacturer is not wrong in saying the new supply is short circuit protected.
but the old power supply could deliver 5 amps when a load is attached....
great job Sorin as usual, thank for all you do. On your next mother repair use this power supply to troubleshoot.
i like the way u explain things. its very details.. even im the one with basic knowledge about electronic, can learn and understand something..
thanks alot sir
I wouldn’t dislike any of your videos Sorin, you are an amazing guy. Every day is a school day 👍🏻
Love the car and brakes comparison. Spot on :) Your vids are excellent!. Have a great weekend, Sorin
This is a great example of why this channel is needed so bad. Keep up the good work comrade!
THIS IS A GREAT HELP TO US GUYS! THANKS SORIN!
Sorin keep up the excellent work you 're doing. BTW, your thought about making a power supply was brilliant! Please do it.
Sorin always enjoy your videos ,keep them coming !
Sorin, you are right! In my experience there are various strategies for short circuit; 1. cut out (a destroyed fuse, or heat- or electronic resettable). 2. Limit the current e.g. to a set value, as in your power supply. 3. Fold-back characteristic: when the current gets higher than a set value the voltage regulates the current to a minimal value until the load lets current get even lower than that. Thank you Sorin for you lessons, I follow them already for many years. I mostly admire your open and honest comments.
Thank you Sorin so much for explaining about those power supplies.
could not find a better channel of electronic repairs than yours
Your channel is easily the best electronics channel for those who want to learn . Thank you .
I learned from this very much honestly. Good examples. Thanks!
❤ Great info and tutoring!
Before whatching video on this channel i just don't know anything and i think electronics a hard things to learn. But now i have better knowledge than before. After watching beginner videos i just start to enjoy the electronics. Again than you so much sir.
“You just burned the processor, uh huh, that’s not good. “ - I laughed out loud at work at a few points but I remember this one most.
PLEASE don’t change your channel because of a few idiots that don’t understand the basics, they probably skipped the basics to get to the good parts (actually fixing stuff), but this is a perfect example of why we SHOULD NOT skip the basics before getting to the good stuff. Your videos are very unusual compared to other channels but you bring so much knowledge and experience to us, it’s invaluable-keep up the great work.
You are the professional Sorin, most of us are amateurs that think we know something ;)
thank you sorin, well explained, to detect the component that is short-circuited this kind of power is very useful, it lets a great amperage to position the element that heats. most technicians use this power supply to detect the short circuit but they must know the limit of the ampere and the voltage that supports the line where the short circuit is located
I like the way you talk
Really fantastic .
And thank you , through your videos I've solved many motherboard's problem
Another Great Lesson from Sorin, yes Please make a video showing us how to build a power supply!! :-)))
Hello Comrade 👍your funny😂love the way you hold yourself...explain.... and I love the way you talk to the camera as if you are talking to someone. It works very well. You've got natural ability. Keep them coming M8. ❤️
This guy is top tech, i learn so much with this videos.Regards, Diogo.
amazing video and very good explanation of what and how the power supply should work.
best channel for learning......i love your good work......from iraq babylon
hello sir im from Egypt this is why i like and enjoy watching you 1 - you make my day you have a good character so we all love you 2 - i keep learning from you and without you it will be a great loss
This channel is superb! Don't take it down, sir!!
Your broadcast Rocks. I learn SOOO much from you. I don't comment much, but I do like videos and a subscriber. You Rock my Friend.
Thank you for the great leassons Sorin.Learning evry day from your videos and some times makes my brain go 200 iq when REAPAIRING a laptop or an electronic part.THIS is all thanks to you.
Hope to see many many videos to come from you.
God bless you.
Excellent lesson and the most wonderful explanation
We want you to explain more about the power supply I enjoyed this video but in the future we want the video long
I wish you health and wellness
I think he is just a real genuine man who have real electronics knowledge. I love this channel for teach us this exactly whats going on in electronics. He is just like god. Thank you so much sir
You are the best! Not understanding the ohm law is tragic. I never put comments but now I had to. The job you are doing is priceless. A lot of young people never get so much experience as you have. You are not an old man :) old man is after 80 years old :)
Hi Sorin, i bought the same power supply, and as you said, it has no short circuit protection, they are lyers... thanks for sharing your video with us.
Keep up the good work. Shout out from your Jamaican viewers.
Where are all the smart a$$ commenters from yesterday?
they went back to school?
No, here's one. I commented it was in CC mode and "he could be seen turning the current control clockwise to it's endstop".
He is using it in CC mode and it is supplying the requested current.
Requested, not from nowhere
@@incandescentwithrage but again, no short circuit protection.. was he wrong with that?
I think the confusion arises from the fact that for this particular model, you set the current limit by actually shorting the leads (it is in the instruction manual). So, to the people who has this power supply, what Sorin did was the correct way to limit current (although he raised the limit to the max of 5a...for best protection, you would lower it to the amount your device can max handle).
NY Prince that's not the point. This PSU don't have a short circuit protection. And he bought it because it should have one and he wanted to make a video how to remove the protection.
Sorin keep up the good work✌️ 😊👍!!!
Nicely explained I have learned a lot from your videos
keep it up sorin, you doing a great job!!
Sorin, let them speak, don't care, if they would have your skill they would not even watch to your videos. Very interesting demonstration !
Thank you for your power supply videos.
Youre the best teacher i have ever had
Slt Sorin! Ai zis de la inceputul primei parti ca debutantii sa ignore videoul. In scoala generela se invata legea lui ohm. Lol. Super tare explicatia. Super tare filmul si informativ. Iti multumim pentru rabdarea de care dai dovada de fiecare data. Numai bine si sanatate!
Sorin you keep doing the great job you've been doing, don't let negative people that don't know anything put you down with some bad reviews. It looks like your subscribers are going up so that's a sign that your advancing.
Well I watched that video and then switched to this one and I liked it and found it informative. Please keep going it is a great channel and I just subscribed so please do more of these.
I am always learning a lot from you. Just ignore the younglings, life will teach them a few things sooner or later. You have my respect sir.
I watched the previous video and did not really understand what was going on, I never commented because I know very little about it all, I just read most of it and was surprised how negative some comments were. This video I learned something. It come in good time too as I was about to order one of these. It was explained very clearly and with an example I could understand. I am sure this video has saved me even before buying it. Thank you so much.
Thanks for your explanation 🌹 go on we are with you.. Waiting for your new vedios.. You help me alot learning about maintenance 👍👍👍👍👍
Greetings from Syria, you are a great teacher, I' m an electronics engineer since 1998 but I'm very sorry I haven't worked in this domain as you do, I hope you health and success.
Fascinating lesson Sir ! Absolutely right on the mark.. Resistance of the wires or cables `Ohm`s Law !`
Even though I'm 3yrs late to the party, great video as always Sorin, good job explaining the ohms law. I recently bought lab PSU and it looks similar to your one except it has a bunch of buttons for memory and an option to turn on/off the short circuit protection.
Greetings from Serbia! Keep good work!
Impatient for the making PSU turorial :D. Thanks Sorin
Don't listen to others!.. Do what you feel!... You have people out here that enjoy your videos, and learn from them!.. KEEP UP THE GREAT WORK!!!
0:32 - Sorin, don't concern yourself with the negative comments. Electronics channels like yours keep all us on our toes. In my view, you as a content provider on UA-cam rank among the highest available among electronics repair channels such as the Rossmann Group; Learning Electronics Repair; iPad Rehab; EEVBlog; Mr. SolderFix, etc. You take the extra time necessary to explain your way of thinking when approaching electronics repair. Keep it up!! 23:30 - That's a 24vdc fan, not 12v.
I discovered your channel a few weeks ago while searching tips to fix some dead motherboards and laptops I have. I was not expecting finding such quality contents. I like watching your videos, not only for the knowlege but also because you are a great person.
I read the comments on the previous video and I did some researches. I found the page "Current limiting" on wikipedia and I think people are referring to it. I don't have enough knowledge to fully understand it. You said the cables are getting hotter but I don't know if it is expected when "active current limiting" is enabled.
Greetings from France.
I agree with you. This is a very skillful man
Nice idea, lets build our power supply.
Basic electronics: Voltage = Amp x Ohm, love watching your videos, greetinx from the Netherlands..
Hi Sorin, I do love how you take the time to explain the "why" and "how" things should work. Even if sometime you have to do dodgy repair XD but you also know the proper way to do it! i'm still looking forward for a Hack to disable the OCP/shot circuit protection :)
I"m sure nobody will read this since I stumbled on the video 4 years too late, but for what it's worth, Sorin is correct, with some clarifications. The purpose of short circuit protection on a DC power supply is specifically for the case when you are in CV (constant voltage) mode, and when you apply the voltage to your circuit it exceeds the present setting of the CC (constant current) control. For example, if you are in CV mode at 20 volts and apply that to a low ohm circuit (say 1 ohm) you might get an initial pulse of say 20 amps of current, even though the CC limit might be 5 amps. Since, by definition, you can't get 20 amps in CC mode (due to the CC limit), the big concern is high currents in CV mode. What short circuit protection does in that case is this: the internal circuitry automatically sees the high current and switches from CV to CC mode, and after a time delay (often user settable to allow for short duration, non-damaging overcurrents) the short circuit protection senses that mode switching and totally shuts down the power supply output. I believe what THIS unit does is it just switches from CV mode to CC mode, with the output current limited to whatever the present CC current limit setting is, but does NOT totally shut off the output. So the difference is either shutting down the output completely or limiting it to the CC current limit setting. I suppose that automatically switching from CV mode to CC mode and limiting the current output to the present CC limit setting can be described as "short circuit protection", since you could make the case that the user should have set the CC limit before applying the 20 volts if the 5 amps CC setting was too much. Anyway, I think that often the short circuit protection on more expensive units is defaulted to OFF, so I wonder if this unit has some way of turning it ON (though I doubt it).
Now everything is clear. So this is the difference beetwen short circuit protection and CC in power supply ;) I always thought that CC could be considered as short circuit protection. Now I know there is a difference. Thank you Mr Sorin.
Thanks sorin sir.
Even though opening lately but the idea is fresh and we are using thanks a lot!!!!