Sorin tried to offer the idea behind the missing short circuit protection. It should stop at the moment when there is one and allow current flow after it's gone + after a time period set by the manufacturer in N seconds during which it will test itself for problems. I think it is normal a specialist in electronics to expect his/her lab supply to protect itself and things connected to it when a short is detected, not to continuously draw or provide a current. It must stop and allow to be started again only when that short is found and removed

i read so many comments trying to explain to a man (who knows more about electronics than all of us) how a power supply works trust me he knows the problem is he paid for something and he got something else!!!!! there is not short circuit protection on this think thats the problem......... this is sad

Hi there! I think Sorin isn't wrong, he just wanted to make a video of how you hack a power supply and remove the current protection so you can check for shorts on laptops. Because if there is short protection on the power supply it will cut the electricity to protect the supplied electronic but also the power supply itself. The cliking noise Sorin refers to is when a "legal to sell" power supply cut the electricity. As he mention a power supply MUST have current protection from European regulation. You can't sell power supplies within Europe without protection. But this new power supply had the current protection already removed so there is nothin Sorin to do. This power supply is "illegal" in Europe but ready for us to work with Sorin's style!! ;)

I have the same one and i am satisfied. Its all about knowing how to use it. It is lowering the voltage. This power supply is good for finding short circuit and its stable for the price it has! Indeed it has not a shortcut protection but its fine!

People Sorin is great man he help us a lot can you imagine to work every day with those electronics...its hard so what if he made a mistake...Keep it up man and thanks for all !!!

I just bought that power supply last week! When you replace the fan with a heatsink, please do a video on it Sorin!

Sorin, there is nothing wrong with it. This is how you set your constant current limit, by shorting the cables at a low voltage. All modern power supplies do this. Turn your amperage down to set it lower.

its called constant current mode... its not broken that's how it functions. most every power supply I've ever used worked like this.

(10:00) - put the tweezers in and then lower the current by turning the current knob ANTICLOCKWISE. The current draw should, I say should go down... >

It is short circuit protected. It's limiting the current to what you set it AT and it will not exceed that. It is doing exactly what the specifications say it should do and exactly what it's supposed to do. What were you expecting it to do? It does not have "over current protection" but you would not expect that on a budget power supply. You know, sometimes it's up to the user to do the sensible thing. If you attach the power supply to a circuit that you expect to draw 1A and you set the supply to 5A you are an i???t. Seriously, what do you expect it to do?

please do a full cover video with all customizations which can apply

It is absolutely normal whit those power supplies. Your leads have resistance 0.1 ohm and power supply is limiting current to 5A so you have 0.5V. I have used tons of them. Itis probably just a problem in the description. If it has short circuit protection than you can do proper testing. Actually, I have never seen one with short circuit protection. How many Ohms is short circuit for you? And if you need one with the thermally controlled fan you need to spend a little bit more than £40 on PS.

Yes, it *DOES* have a short-circuit protection. The red light is telling you that it is in protect mode. You can set the limiting current by shorting and then rotating the current knob just above the "CC" on your power supply. Sorin, you are good at what you do but there are a few things we are glad to share with you. Keep it up, bro.

If it's heavy, It's good unless they have placed a piece of iron inside to make it feel premium.

Fan speed controlled by temperature will be a great video. 👌👌☝️

That's normal. This device has tow ways to control it's output, voltage control when the right light is led and current control when the light on the left is led.

yes please do it.. temperature control fan.

Hi Sorin, you are a great guy and you made me laugh out loud. I’m sure you know already to short the probes to set the amps 👍🏻

Try turning the amps down while your shorting it, that's how I use mine to limit current.

Its called a class 2 power supply here in Canada

Thank you

This is neat. It is identical to the one I have. I took the handle off so I could put stuff on top of it.

I have the same model and it does the same thing. Thought it was normal and it was 😊. The fan works when using Higher voltages, but with a well cooled room your not gonna be having any problems

thank you Mr.

I am sorry...my comment was deleted.... i understood voltage limiting while we had, in reality, voltage drop due to excessive consumption....you are right...thanks to take your time to explain us

pretty sure the replacement will do the exact same thing it does nt have any over current protection just constant current

Love the tweezer in terminals. 😍

If this psu had an overload protection we couldn' t find a short.That is because the psu would set the current to zero

Thanks very much for your time and good work keep it up your REWARD is in heaven !!! #. I want to know; What type of phone heater and air compressor are you using ?

This kind of power supply is used to identify possible short circuits by heating components. Very useful indeed. you can set the current to low if you want protection or higher if you want controlled heat to build up. A thermal camera is often used to spot the heated component.

The power supply is doing exactly what it's supposed to do. It's a 5 amp capible power supply set to 5 amps. It's going to push 5 amps.

Let me explain: CC constant current, CV constant voltage, OVP over voltage protection, OCP over current protection. That PSU only has CV and CC. If you want one with OCP and OVP you need to pay a little more :)

One of the best technicians on youtube and never used a linear power supply! There's nothing wrong with that power supply. You are in CC mode

I think Sorin is just getting us with an early April Fools episode ;D

I have the same but different company name! What I first did is put it low cost temperature sensor for a fan, because it is too loud. When you make a short it get hot really fast!

Good video. Thanks for sharing with us. This power supply it is dangerous. 0V 5A its shorts circuit eventually it will burn. Don't forget to check every day if its not on short or off before leaving. Like you said, left the producer with defect :D

Those protection maybe design for internal circuit, not for the output of the power supply. And that power supply require you to shorted the prob in order to set current limit.

so its already jailbroken 😔 I have this type of power supply too, if you short it you can adjust the current, but as i understand if you put a device that draw 1amp like a fan even if you set it to 5amps it will only draw 1amp, so its a protected?i thought removing that limit force supply to send full 5amp, thanks again for the video 👍👍👍

i have a WEP 305D, it does the same thing, and it's react like your modified powersupply. I'am happy with it for finding shorted component :D

i have same type of powersupply for the past two years, and it operates the same way as this one...

It's working. It's supplying 5A because you turned the current up to 5A. What did you expect it to do differently?

It's just like when a math-professor makes a simple error like 2+2=5 :D Every student can see it, so everybody is laughing and pointing. Forgive us Sorin, we still respect you highly for your great videos, experience and amazing knowledge.

maybe if he presses the STOP/OUT BUTTON..then it switches into short circuit protection mode rahter than constant current or constand voltage mode.....otherwise it broken as the voltage of say 10 volts is reading 0.4 ...which implies that the potential difference between live and ground is zero due to shorting...but the current is still flowing....and the manual said that it has short circuit protection...which it hasnt ..it has max current limiting...but no short circuit protection. had it got short circuit protection..then when the voltage drops from 10 volts to 0.4 volts implying a short circuit as potential difference between live and ground is now close to zero....the current should stop flowing ....this is short circuit protection.... on his unit current keeps flowing...and if he left it for an hour ...would mean fire....not only that woudl melt plastic leads....would burn out chips in the device.... would have to buy new device...and also new house that burn down. this is not short circuit protection. your child messes with electronics.....leaves leads touching and goes out to play...next thing house burn down.... no short circuit protection... you must be bloody stupid to think it is short circuit protection...also on delicate logic circuit ..you can blow chips with just little touch accidentally if short not protected.

In all your troubleshooting video with a short circuit issue. You always inject voltage in the circuit and find the component that gets hot. You always show us the current goes high while the voltage went down. Now you did the same, you short the output. Current goes high while the voltage went down, and you now you will say power supply is faulty? Whats the difference?

I got the same. It's a good tool! I use it with your good advises !

that's normal, connect +ve to -ve, set your current limiter using the current knob. then disconnect, now on you can't exceed the current you set, when exceeded red led will be ON.

I have seen a couple of short circuit protection videos, isnt a matter of opening the piwer supply and seeing if the large eg 100watt protection resistor has been jumpered? Might be a lesser value for lower max current supplies.

Sorin is speaking about a very special power supply having a “FOLDBACK CURENT LIMITER”. Very rare (and expensive) for a lab power supply.

There's two kind of current limiting constant current and foldback current limiting, lab power supply usualy use c-c not the fold back

By the way it's fan is temperature controlled. Try to lower the current to 1 amp and you will notice it is switching ON and OFF

I really love your videos Sir. you are really doing a great job. please, i would love you to do a video on how to use a Power supply in PC and Smart phone repairs,. and also, Understanding a multi-metre for beginners. I've watched many video's concerning this on KZfaq, but none of this video's has made me understand how to use these equipment's.

To everyone confusing 'short circuit protection' with 'current/voltage control/limiting'... The issue is that Sorin thinks the PSU should cut-out in the event of a short circuit but when he shorts the wires the unit keeps supplying power. He fully understands what current/voltage limiting is, that is not the issue here. I am no expert but I think that the short circuit protection he is looking for is internal - ie the unit will cut-out in the event of an internal short but not due to a low-resistance-load short of the type Sorin created?

CC means Constant Current.... that is the current stays constant even in a short..... that is even if you had a superconductor at 0-ohm, a 5A limit is 5A.... it will apply a voltage across the conductor for 5A flow (in the case of 0-ohm the voltage will be lost across the power supply internals). The voltage is supposed to drop as per V=IxR where I and R is fixed and thus the V follows. This CC mode is how I manually recharge Lithium batteries.... set max voltage, set safe charge current.... hook up batteries, charge. When nearing 4.2v per cell it is advisable to supervise the batteries... For circuit diagnosis, set to about 800mV (1v should be OK) as sensitive circuits may be down stream of the circuits.... this can help locate the short by literally heating up the faulty component (unless said component behaves like a wire.... then educated guessing applies). CC mode is super useful.... having a current limit cutout means you could've applied, maybe up to 30V and 5A for even a fraction of a second.

I have question, why necessarily having a big transformer is a good news? what's wrong with the switching power supply as a power source?

Hi sorin, I'm a very good fan of your Chanel and I will like to specially thank you for your good work and for all the effort you put in uploading all those educative videos. I must confess, your videos has helped me alot in my repair business. As a matter of fact, I have more than 80% of your videos downloaded on my device. But dear Sorin, I will love it if you can do a video on How to disable SHORT Protection on a power supply. I recently got a new power supply ( 1502DD series) but it's seriously limiting my work becos I can't use it to find short on any shorted iPhone. Thank you so much for your contribution and help towards my successful electronic repair business. ....................Your very good fan from NIGERIA.

Hello Sorin, can you do a video on how to disable short circuit protection in power supply unit or is there a video on that already?

so this is the best powersupply to find short circuits because you have nothing to modify right? it will work just out of the box and we can follow your lessons with it right?

You should probably read the manual first... You can set the current limit with the current nobs when the leads are shorted. You can set the voltage when the leads are not shorted.

Instruction manual says it can be adjusted from 0 to 5 amps. Did you read the instructions 🤔 part 4.2

Merhaba. Hello from Turkey.

Mine cuts out when the unit itself can't handle the MAX current BUT this current can only be reached if potentiometer is changed inside the machine to above the set value this unit comes with, therefore allowing the unit to go above 5 amps. My unit can handle 6 amps therefore mine is within the range

5 Amps but almost 0 Volts. You have no sparks when you touch the two probes. The user manual indicate to short the PSU for tune the amps, and after you need to unshort to tune the voltage. I think this is a feature. Try to have 2A 2V like in your videos on a faultly MB, per example. It's impossible. The voltage will bringing down to 0.0x

(5:30) - Shit ! Is this for real ? Damnit, gonna send it back before taking it out of the box. ...

Sorin, you turned the current limit up from 4 amps to 5. And complained. Not a single attempt at turning it the other way. Can you hear the viewers screaming at you?

PS: Lavolta. EXACTLY SAME ONE. >

RTFM maybe. Button in the middle labeled "Stop"/"Out" could be current limit mode or constant current mode? 1:17 - 1:21 then 2:18 - 2:30 = Mmmmmmm

It’s a nice power supply

Cook Hotdogs with it...lol

Hi Sorin, I have a question. Is it good to lubricate the hinge of a Laptop?

I thought you would want this feature for your brute force method!? I have this exact same one and operates the same. Did you have to modify your other power supply to behave the same way or something?

Hi Sorin,you should put your PayPal on your page so people can make one off payments to help support the channel.

I killed mine by setting 30V and short... I was like TIG soldering my cables... result: mosfet dead and something else in the regulation path, didn't check yet

Sorin, what kind of power supply have you used in this video, what model more exactly? 🤔 Thanks

I would have liked to see how to disable the protection... It's a pitty

I have pretty much the EXACT same cheap chinese power supply. Its constant voltage UNTIL you hit the current limit that you set. The fan noise of mine is near silent until you short it. Once shorted, it cranks up the fan speed (which it would need to do to get rid of that heat) One thing I wish it could do would be to show what the current limit is set at (without having to short it first)

Am use to the fan going up when ever am working with short

I have the same unit and it is doing the same thing.

If it's heavy it's good...

I’m surprised that you are surprised... This is the model 305, meaning, I guess, 30v 5A max. So what are you expecting from a short? 5A, 0volts of course...

Hello Sorin I have exacly same power supply. But soz Im begginer Im scared to use it at all. Can you show how to make short circuit protection for this one?

Sorin, pe cand un tutorial despre cum sa facem un circuit de protectie electronica pt. scurt-circuit ? Multumesc anticipat!

Voltage going down,is that protection? Current is only limitation and when you increase current voltage drops and protect....

Open the case!

I have a power supply that works like this one, the wanptek nps306w, but I can't figure out if I can use it to inject voltage. Will it heat the shorted component?

Just get Rigol DP832. You wont regret it.

Yes! Was waiting for this one.

my power supply does same as yours ,same make and model

This videes make me sad because in Syria we don't have good quality tools in 3 months I'm change 5 multimeters

Hello Sorin. Would really like to see a video of a fan regulated by thermistor. I have power supply with fan constant on that I'd like to mod. I am also willing to give a dollar or two if you need another good power supply that you can modify to make that video.

Maybe you can get your money back and get a better one. I can use this one. I need one like that. See you next time thank you 🙏

Sorin welcome to constant current mode which is a protection since you can't go over the PSU max current or your own set current :) electronics are wonderful aren't they ? … for what you do , injecting external current into shorted components, using either smps or linear PSU is the same. Linear PSU are used in circuits where low noise is required, like for example , quality audio amps.

Sir I am having same power supply it’s not working sir can you please explain schematics

+1 it is useful to report the fault port not plugged heheheh nice

but this one came without protection or it has a faulty protection thanks Sorin it could be a good video, shame on the seller...

CC mode, all ok, what is the problem?

Sorry for you Sorin, This time, you're wrong! The power supply is working fine! It works just the one on my bench! The power supply is regulating the preset current (5A) adjusting the voltage... You can regulate how much current you need, rotating the current knobs on the left, in the front panel! Maybe the one you have on your benchtop works differently, but all the power supplies I ever had (also HP, and other hi-valued supplies works like that... So, I think your power supply works fine (with no "click" ok..) but I'm used repair with a power supply just like the one you are showing, setting the shor circuit current BEFORE i actually apply it to the circuit...

In same way with this psu, when i want to put 1v on laptop motherboard, often i can't control current, can you tell me if it's normal? feel it sometimes useless. Thanks

Korad KA3005D forever 💞

It was total gibberish this time!

When it is working as supposed to be it doesn't have any fan,even if pretending that the normal function is a malfunction and the wise audience says no it's definetely works as good.Besides from a well known and boring tll death linear power supply how many surprises someone is expecting to see.In the real unboxing pioneers sparks,fumes and fireworks it is the minimal requierements.