Finally, the power supply arrived ..... wait, what?
2019 ж. 16 Қыр.
46 508 Рет қаралды
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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 !!!
Yeah exactly nobody can be right all the time
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 👍🏻
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 believe that is incorrect. There is a fuse in the plug no? If so, it is current protected to maximum of the fuse, meaning it does follow European regulations and can be sold. Besides a shorted cable will draw more than 5A, but we never see it draw more so it is limiting the current. If it draws more and blowing the fuse then it would be illegal.
That PSU is perfectly acceptable to use as a means to detect faults without modification. Lets say i have a circuit that normally pulls 2amps at 12v with a suspected short. I would set the PSU to 12v and 2 Amps. If the circuit has a short it would drop the voltage close to 0 but still pull 2amps. This would still protect the circuit because the PCB is desgined around 2amps. If you mod the PSU to bypass the constant current feature, the said circuit would probably catch of fire! I believe he does not understand basic electrical theory. I would be worried sending my laptop to him to fix.
I have the same Power Supply and I can confirm that it has a Short Circuit Protection. Even though is showing the Amps is not actually out putting anything. It's showing there so you can limit the current. I've tested with a load (lamp) and as soon as you short it the light goes off meaning the PS is cutting off. Perhaps Sorin could do a video disabling the SCP on the PS. I'm desperately waiting for this so I can learn it.
hi sir I am just a beginner. I just want to ask if using a power supply without short protection for troubleshooting shorted parts on motherboard will get damage in the long run?
So what types of power supply should one get that is good to detect shorts? Thats the only reason I want to get one.
I got the same. It's a good tool! I use it with your good advises !
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!
But this one can switch from constant current to constant voltage?
@@emanuelmilani7976 under loading it gives you the option to change current and voltage. Sure if you go at full current the voltage will drop like a short protection but with lets say 3 amps you can adjust both amps and voltage!
Yes. But if can select this modes the ps can decrease amper in one mode and voltage in the other (I think some other ps can do this) My question is... This ps can change mode?
@@emanuelmilani7976 of course you can change voltage and amp at the same time but at full loading you cannot change voltage. It is like protection. You can check for video reviews about this ps on youtube from other users.
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?
I just bought that power supply last week! When you replace the fan with a heatsink, please do a video on it Sorin!
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
Love the tweezer in terminals. 😍
Yes! Was waiting for this one.
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.
@PVJ No. This is a general feature for that cheap PSU. It is limiting the current what u set it up before. Than, stops more current flowing over what u set,in a shorted case. So ur board safe, just think before u use it, what is the current setting.
@PVJ So, that cheap PSU has only an overload protection, not more. U can use it, but be careful with it. Set the current settings down like 5-20mA, when u start to work. But better an also cheap (for example Korad KA3005D) has a button for turn on, off the short circuit protection as u want, or for every time use it on. Good for motherboards.
@PVJ - These PSUs are OK for diagnosis/repair - you just have to be careful when using them. Sometimes you _want_ to disable automatic shutoff, like Soren did to one of his older PSUs, most of the time, you want it on AFAIK.
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?
@@albertogog8567 Yes it will.....but you need to short the leads first to set the max amperage you want to inject, otherwise it will burn the component. Maybe set 1 amp or something low.
its called constant current mode... its not broken that's how it functions. most every power supply I've ever used worked like this.
EXACTLY
Yes. Why do so many people like this guy?
Fan speed controlled by temperature will be a great video. 👌👌☝️
thank you Mr.
yes please do it.. temperature control fan.
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.
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?
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.
please do a full cover video with all customizations which can apply
? For what? He did it already, search in his videos...
yes I would like to see a video of this too
Hi Sorin, I have a question. Is it good to lubricate the hinge of a Laptop?
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
(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... >
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
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.
You've never seen one (a bench power supply, I'm presuming?) *with* short circuit protection, or did you mean to write *without* ?
"How many Ohms is short circuit for you?" How long is a length of track ?
@@arnolduk123 how power supply know answer to your question?
@@PeterHovorka LOL short is resistance of track that is what I meant. what ohms is short ? How long is a piece of string ?
@@arnolduk123 - You failed engineering, Rimmer.
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.
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
How long have you had it, and how much did you pay for it?
@@NeuronalAxon I've had it for a year now and i paid a round 60$
@@11111111Moe111111111 - Sounds good. Thanks. Do you use it a lot?
@@NeuronalAxon I don't use it alot but at the same time I don't abuse it. 30v-5A D ZHAOXIN is the model RXN-305D
@@11111111Moe111111111 - Cheers - I'll check it out.
Thank you
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.
Just jump the 100w resistor.
@@andrewverran3498is it only one that is present in the power supply? Can you better description on how to do this?
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.
Good to see you. I bought one those oled soldering station's. What pen types do you like, I currently have the t12- ILS and t12-K
@@momfiethehunter504 T12-J02 for general purpose and K for wicking and big stuff. With Micro quick change handle.
@@jeffescortlx I'll see if I can get a j02. I just got the iron so I'll see how good it works, i knew the k was good for wicking so this confirms that. I did not know about the j02 so thanks for telling me about that one
Power Supply should disconnect the voltage when it gets short. this power supply is constantly providing the power in short circuit. a normal Power supply disconnects when + & - points are short together. he wanted to show us how to modify a normal power supply to provide amps in short circuits to check the short components. but unfortunately this new power supply was already doing the same thing which he wanted to modify. so it is a defected PSU.
@@sikandarkhan-gb2nw I have experience with 4 different bench power supplies manufactured within the last 5 year's. They all have constant current mode that continues to work while shorted. If you set it to 2 amps, it's going to push 2 amps. If you set it to 5 amps, it's going to push up to 5 amps. The advertisement is maybe misleading with listing short circuit protection. It's probably internal protection if something fails in the regulation circuit. I'm guessing a thermal switch or fuse on the transformer.
Sorin, what kind of power supply have you used in this video, what model more exactly? 🤔 Thanks
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 KZhead, but none of this video's has made me understand how to use these equipment's.
I think Sorin is just getting us with an early April Fools episode ;D
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.
EXACTLY.
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?
Try turning the amps down while your shorting it, that's how I use mine to limit current.
Sorry for being stupid, but how do you mean?
@@NeuronalAxon By using the adjustment while 'under load conditions' to get a more accurate setting of current control. Sort of like when you get a voltage drop when using a switched mode power supply (electronic transformer) the output can be many more volts just taking a bare measurement than when you are actually powering something. Hope that makes sense.
@@Danechip - Gotcha, I think. Kind of like compensating for a non-linear response over the whole range?
Better to use a continuity tester for detecting shorts. Using a PSU to detect shorts is dumb. I would rather hear a beep than watch my workbench go up in flames :)
@@arnolduk123 Read it again Arnie. Brian was saying he shorts his PSU to set the current, not test for short. He has shorted it on purpose FOR a purpose, not to diagnose whether a fault exists via a short.
Am use to the fan going up when ever am working with short
If this psu had an overload protection we couldn' t find a short.That is because the psu would set the current to zero
you mean if it had short circuit protection....which it doesnt... you could still find your short as it would unexpectedly switch to 0 amps...when you expect it to be taking amps..that identifies your short on a short circuit protected power supply.... the psu has overload protection...you can restrict the current with the nobs...
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!
If it's heavy, It's good unless they have placed a piece of iron inside to make it feel premium.
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.
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?
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
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?
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?
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 👍👍👍
You can't 'force' current into something though. Now a hard short will draw whatever you've got until something pops, but other things... not so much.
Its called a class 2 power supply here in Canada
Merhaba. Hello from Turkey.
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 :)
OMG !😊
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.
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
Mine switches on at 100mA, so I guess it's not calibrated too well.
It's working. It's supplying 5A because you turned the current up to 5A. What did you expect it to do differently?
It should stop the current flow by it self as soon as it detect a short in the output that's how it should work with protection
PS: Lavolta. EXACTLY SAME ONE. >
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.
Where do I get the proper leads to hook up to Power supply?
pretty sure the replacement will do the exact same thing it does nt have any over current protection just constant current
i have same type of powersupply for the past two years, and it operates the same way as this one...
Sorin, pe cand un tutorial despre cum sa facem un circuit de protectie electronica pt. scurt-circuit ? Multumesc anticipat!
Sorin is speaking about a very special power supply having a “FOLDBACK CURENT LIMITER”. Very rare (and expensive) for a lab power supply.
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 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)
I agree about the current setting, should be a button instead of shorting the leads. Suppose you could also just add a push button that shorts the + and - when its pressed to display the current setting. Of course it would have to be a 5A push button :)
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.
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 ?
There's two kind of current limiting constant current and foldback current limiting, lab power supply usualy use c-c not the fold back
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?
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.
LOL. A bit dramatic..but yes mostly correct there.
@@arnolduk123 mostly correct ha ha..i just educated you as to what current limiting protection is and short circuit protection..and you answer like you taught me something...ha ha you funny guy.
@@runthomas my teacher said that to me once, yes you were correct in thinking that. ha ha ha
Habih la hg kali nie sorin
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.
WHERE YOU BUY FROM?
+1 it is useful to report the fault port not plugged heheheh nice
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
thx
Oh Dear. I'm just two and a half minutes in to this video and I have just bought this "linear" power supply off of eBay. Yeah! Exactly this one. It said "1808 sold" I guess it's now: 1809 sold Haha No, For real!!! xxx Love you, man >
Bodragon Don’t worry, it works perfectly well. Sorin does not.
@@brunhildehartlage524 But I love Sorin too. Perhaps Sorin is just... ...sorry... ...not even going there... ...Love him Forever.
Hi Sorin,you should put your PayPal on your page so people can make one off payments to help support the channel.
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.
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?
Cook Hotdogs with it...lol
I have the same unit and it is doing the same thing.
(5:30) - Shit ! Is this for real ? Damnit, gonna send it back before taking it out of the box. ...
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
what Ampier suppose to read sir?
Instruction manual says it can be adjusted from 0 to 5 amps. Did you read the instructions 🤔 part 4.2
Yes it’s normal
my power supply does same as yours ,same make and model
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?
I think he is hiding and kicking himself. Perhaps in hindsight he would have watched his own video back before posting it. I am sure he would have spotted it. I was questioning myself while watching this if I had started forgetting shit from the past but still screaming at the TV to look at the BIG red numbers on the display.
@@Danechip IF Sorin read the manual then I was going to hit the unsuscribe button :) Cmon, are you suggesting he don't know the difference between current limiting and short circuit ? This guy made a hotair device out of a tube and a soldering iron filament.. genius! kzhead.info/sun/fLCglbpwg2enhIE/bejne.html
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?
Yeah it will limit the voltage doesn't matter if he is pushing 5A the voltage isn't rising or going anywhere. He was just confused i think. >D
I agree. I think the short circuit protection that is advertised is if there is a internal fault.
Finally found the good comment.
You're the only second commenter who understands what's going on. So many people are so quick to say sorin is confused
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?
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.
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...
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?
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
Hello Sorin...Come to Besiktas with your new PS...
If it's heavy it's good...
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 🙏
I had founded this video. maybe the short circuit protection is like in this video... no?
They are noisy I've got the same psu with a different brand , and I'm waiting for the video on fan regulation or the fan connection to the 5v
You could get a fancier fan that fits the hopefully standard-sized fixings on the PSU, and/or just put a resistor inline with the existing fan cable to slow it down.
@@NeuronalAxon I do not think it is a good idea. If u reduced the fan speed, u can burn ur psu. u may use a bigger and better profiled fan, not just a slower one - I think.
@@aszandek Using a pot to control speed is far better than a fixed resistor as you can manually increase the speed when the current is high.
@@arnolduk123 But I do not want to pay extra attention just for a fan speed, I prefer if the unit do it automatically. U can do, as u want.
@@aszandek Well if you dont use more than 1A you dont even need the fan running so you can work without the distraction of the fan on full speed. You obviously enjoy the sound as it doesn;t bother you.
It’s a nice power supply
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?
He says the power supply is expected to cutoff or regulate the current, which it does. The current is limited to 5 amps.
Listen what he says. Normaly theres a short protection that he removes
Just get Rigol DP832. You wont regret it.
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.
Did you get it replace or got a.different one. So what is the update. I never buy anything online first i go to the store first
but this one came without protection or it has a faulty protection thanks Sorin it could be a good video, shame on the seller...