Modify a Laptop Power Supply 5V to 30V | How to make 12v to 220v inverter

[@hoccachtucheephathuysangta9816]

You share very detailed, responsible and thank you for sharing your knowledge to many people, thank you again.

[@rahulpatelgujratahmedabad3497]

Good tiching karte hai 👌👍👍👍👌👌👌👍

[@mediadigitaljepara7885]

Thank you my brother. You are truly amazing.

[@froogybaby]

can you add a pot for the current?

[@TarekTechno]

Thank you my brother from egypt

[@Wilson84KS]

Wow, what a nice psu, clean and a lot of spacing, I have never see one that is not shielded and without that annoying silicone.

[@PhdHung]

yes. Here's a cheap psu, it's very simple :D

[@MuhammadYaseen-vx5hw]

at 10:03, suddenly I saw a quarter watt resistor, which you did not show while mounting it and what is value of it ?

[@PhdHung]

resistor 4k7 for LED :D

[@arthur88888888888888]

Nice. Do you know if it will work at 30v for a long time?

[@PhdHung]

Of course

[@Zebra_Paw]

@@PhdHung no, probably not! You have to change the output diode and use a diode that can handle a higher peak!

[@OldSkoolF]

Excellent!!!! Do you have a Rumble channel??? And why the long fingernail???

[@gedebuxstouchscreen3973]

thosiba brand adapter circuit is different and I found it difficult to find the feedback resistor. please help

[@chandruasp]

What ever be the SMPS or adaptor find TL431 has 3 pin leads, Leave the Grounded pin and one more pin connected directly to Opto coupler also leave that and the remaining pin connected to dual resistors 1st resistor (R9 in this video) one end connected with the remaining pin of TL431 and other end with ground. another VR and resistor in serious are coupled as a single resistor with o/p voltage pin. So find out easily by using multi meter at continuity checking mode and check remaining pin of TL431 and connecting resistor other end is with +o/p and another similar resistor with ground . thus these 2 resistors need to change 1 by fixed one and another by pot. thats all. After his video I have done several adapters.

[@TeardownOZ2CPU]

Error in schematic U1 VCC, R1, C3 some dots are missing. DONT remove the very important noise capacitor at 4:32 it is NEEDED for EMC radiation

[@PhdHung]

Yes, it caused electric shock, so I removed it.

[@TeardownOZ2CPU]

@@PhdHung cool, then it was simply defective, then it is better replaced, since its purpose is to close the high frequency loop, where the other halve of the problem (signal noise generator) is the capacity from primary to secondary side in the transformator, this cap close this, and avoid huge radiation between prim-sec side

[@PhdHung]

thanks. I know that.

[@orbaar]

Lo que observo es que el plano que presenta no corresponde con el de la modificación-

[@Vizi_]

Why did you removed ceramic (blue) capasitor and how i could find a feedback resistor, on my power supply i dont have diode (u4) on ur so..

[@Wilson84KS]

I know I'm late, but maybe you still didn't find out and wonder. It's not a diode, it's the TL431, need to understand the circuit a little bit to find it by logic, it drives an opto-coupler and should be marked as "U" on the pcb, it could also be in a to92 housing or the psu work another way.

[@smoke_stackz3168]

The higher the resistance the lower the output voltage or it will go high to?

[@PhdHung]

If the resistance is large, the voltage increases

[@Zebra_Paw]

@@PhdHung depends on which feedback resistor you change as there are at least two of them in a divider bridge!

[@ta5fa]

Why remove capacitor (blue cap. near the optocoupler) ? please info

[@PhdHung]

capacitor that connects high voltage GND and low voltage GND. I removed it because it could cause electric shock.

[@443DM]

@@PhdHung That's a capacitor filter. Probably to send any residual 60hz AC from the low voltage side to GND. No reason to remove it. If you're worried about shock while working on the circuit, just short each capacitor with a tool with an insulated handle and then work away.

[@juliusonoja1242]

Thanks for explanation it very illustrated my brother

[@shyambhosale8339]

Nice upgradation video . I liked it.

[@yoy-gul6447]

gud day sir...why you put a resistor at the back? where it goes?

[@avadheshmaurya1972]

Thanks a lot for share the details with us.

[@PhdHung]

[@bangjaka9869]

can this be applied to all adapters with the same voltage, for example different brands..?? Thanks...

[@vobinhthu5299]

This project is very good!

[@juliusparker3039]

Please what components did you add to the original board and which one did you remove

[@PhdHung]

I removed the feedback voltage resistor and replaced it with potentiometer

[@juliusparker3039]

Which and which are the value of former feedback resistor

[@vickyhackz6505]

5k

[@tapashaldar1506]

Sir will the output current remain the same or change.

[@KinhKha-lm2zl]

quên còn mua cái đồng hồ vôn gắn song song với ngõ ra nưa là thấy số cần sử dụng. ....he he he ,anh lai rồi nha em

[@PhdHung]

[@tannguyenngoc3766]

Nối con trở này từ mát sang chân điều khiển hay từ chân còn lại sang con opto thế bạn ? Tks

[@PhdHung]

Thay con điện trở phân áp nối xuống mass thành biến trở là ok. Cái này dễ mà, bạn coi lại video có sơ đồ nguyên lý đấy.

[@sam-mr9nz]

Great, i'm also have a power supply like that, but position of resistor feedback is diferent with you, would you tell me what code for resistor feedback that you pull out?

[@PhdHung]

Remove resistors connected to gnd. Find it near tl431

[@sam-mr9nz]

@@PhdHung All i do it is done, but if the voltage below 18V beats a sound, the more clearly audible if the voltage is lower, the led blinking, the voltage unstable, how to fix it ?

[@Chathuwa.]

Did you removed the cap ?

[@Chathuwa.]

I mean miler cap

[@Zebra_Paw]

You shouldn't remove the class Y1 capacitor as this creates tons of interference, and for example a phone charging from it will lose touchscreen ability (or almost)! After disconnecting it the touchscreen is fine again but you can't use it while charging! You should better ground the output! If you have no ground then connect the negative output to neutral with 1M resistor, but make sure it's NEUTRAL and NOT LIVE!

[@dunderdee]

uh now I finally know why some old phones won't work while charging with one specific charger

This depends, I belive this is commonly done to enable connecting PSUs in series.

[@YSNperformans]

How many amps is the output 5-30 volts ?

[@RingZero]

Although this video is cool and adds to your learning, it is still best not to tamper its original design and use external Buck/Boost converter which are fairly inexpensive.

[@baotaichannel1938]

Thank you my brother.... Thanks. very good and infomation. I am from LAOS PDR

[@bhagwanonline5849]

Does it do for 12 batt adaptor

[@arunkumarvadla7563]

Hi Hung Pham, after his modification can this be used as a CC/CV battery charger?

[@kenhnghiencuuientu2550]

Bạn ơi bạn làm rất hay và chuyên nghiệp

[@jossydornelles7606]

Hi! I just got amazed with your video because I need a smal power supply to my experiments. I have a GlobTek GTM96600-6024-T3 24v 2.5Amp that I would like to increase the output voltage to about 30V so the StepDown Buck Converter I have can work better to stablize up to 24V at output. On my inspection at its circuit I found it uses the IC EA18362 and the reference is a SMD with the id of GCA (not TL431). The resistors used are far different from the ones at your diagram. On this GlobTek I found the "R12" as 214k (200k + 14k) and "R9" as 24k (yours are 2k+pot5k and 790R respectivelly). I would be greatfull if you may help me.

[@rodrigosalgado8074]

Thank you profe good video

[@PhdHung]

Thanks for watching

[@supermaninho2010]

Ótima sugestão. Like.

[@PhdHung]

[@md.nahidulalam3376]

I have done as you say. but it is pulsing when voltage is lower or higher than 19V. Please advise.

[@sam-mr9nz]

Me too

[@Heienidix]

I want to get a voltage of 21 volts. What is the value of the (fixed) resistance

[@malcolmrovero1190]

is that power supply can charge the battery??

[@ThongNguyenCTO]

Good job!

[@PhdHung]

Thanks bro

[@eriguxholli5293]

How to find the feedback resistor? I have a different kind of charger and I really don’t know which one of the resistors is the feedback. I don’t know if you can help me with that?

[@Semixyz]

A trick I have found useful--look for the high-precision resisters, i.e., 4 digits for surface mount, and they are normally in the 2K-15KOhm range.

[@desqibaidilah9714]

hi bro, please answer😁🙏🙏 3:47 before being given a 10k variable resistor there is an SMD resistor, how many ohms are there.

[@wurgervomlichtenmoor5073]

Here you must check also aux voltage. PWM IC is driven direct from a winding that is corresponding to the output voltage. UC38XX can get very hot at higher input voltages. Why did you remove the EMC capacitor?

[@PhdHung]

I see there is 1 15V zener diode there, so the voltage is always a steady 15V. I removed the capacitor because the grid in my country only has 2 wires. There is no ground wire. If not remove the capacitor, when touching the output. I will receive a slight electric shock

[@wurgervomlichtenmoor5073]

​@@PhdHung Ah ok. Then this was only a sample schematic and this is a supply with PE on secondary -. The 2.2nF capacitor in the schematic were normally ok for touch current requirements for class II supplys. There can be some other issues if output voltage is higher then designed but this supply has apparently enought reserve for that range for normal input voltage.

[@james10739]

Ya I tried to modify a cheap China xbox one power supply and after I finally found the voltage devider or what all I got was like 9v to 20v buy once I got it all back together it's more like 10v-16v

[@KinhKha-lm2zl]

cái này hay ....để anh làm 1 cái ,rồi chỉnh áp sạc pin máy khoan .....he he he

[@PhdHung]

cái này dễ mod lắm anh

[@KinhKha-lm2zl]

@@PhdHung anh mở 1 cục sạc asus thấy không giống cái của em....nhưng từ từ anh mò .....chắc cũng ra ...he he he ...cám ơn em đã đăng

[@suryapatnaik5720]

I had ibm charger, output 16v 3.5amp.it has lm358 with 10k preset on secondary side. And tl431 with 1 and 3 pin shorted. Can I use same method to make it variable voltage output.

[@RingZero]

The overall adapter power remains the same. If voltage increases, the current decreases and vice versa, however the max current is still the limit of the secondary winding of the transformer.

[@guillermohochnadel380]

Thank you for your explanation . I need your help , I tried to do but fixed voltage 24 V , it´s a 15 V power supply with IC OB2263 6 pins but I only can have 21V , when try to increase to 24V it protect itself and goes to 0V . Please help .

[@vajirapriyashantha3932]

CANT 15V TO 24V (DO THIS SOME TIME BLOWING THE POWER MOSFET, YOU HAVE TO FIND 19.5V ADAPTOR

[@joshuvajohnvarghese2372]

What's happening there is you are trying to over switch the ic. The so called modification here is actually increasing the duty cycle of the switching ic. You can't go beyond a specific T on.

[@puakegawak6334]

does the amperage value decrease. if the volt is increased the voltage

[@MrSingh-go3mu]

Can we convert this Charger/adapter in to 67.2 Volt Adaptor? I want to make 67.2 Volt 2Amp/3Amp Adaptor. Can you help it.?

[@muhsen61]

67,2 ? for what?

[@prashantagre9768]

Good information about regulating SMPS power supply, Thanks

[@KinhKha-lm2zl]

cho hỏi 1 tí ,cục sạc asus 19v 4,7A đầu ra có con ic ba chân 431-4MTB có 2 chân nối với 1 con trở nhỏ .anh thay con điện trở chỉ số bao nhiêu để ra 24v vậy em,đầu ra có 2 tụ 25v-1000uf,có cần thay 2 con tụ giống em không

[@PhdHung]

anh thay con biến trở vô, vặn đến 24V thì rút điện, đo xem bao nhiêu ôm rồi thay bằng con trở cứng vô. nên dùng tụ 35V hoặc 50V cho an toàn anh

[@KinhKha-lm2zl]

@@PhdHung ok ,cám ơn em, cách này hay với anh.cám ơn nhiều,he he eh

[@sadboy3990]

Sir thank you very much sir my dopter is not having tl431 ic how to make it variable?

[@scotthall9884]

Aye Boss ok so i have a Onn Universal Laptop power Supply blah blah blah Which resistor would i be replacing with the Potentiometer exactly if you could help me with that. I mean i have another brand one also... which ever would be easier to explain or that you may have handy also. Thanks in advance

[@owenmcpro]

How can I know which are the feedback resistors?

[@smoke_stackz3168]

Find the resistor connected to tl431 reference pin to +

[@yonnigarciarobotica932]

@@smoke_stackz3168 que balor de resistor es la que le pusiste en la placa o que balor es la resistensia si mepuedes desir por favor

[@amin125ccm]

what value potenciometer was used?

[@PhdHung]

VR 10K

[@chinnarao326]

Resp Sir! My Laptop Charger was DC Voltage 19V Decreased to Zeroo Voltage Sir. How to Repair Sir. Please Advise Sir. -- ChinnaRao Paderu Andhrapradesh

[@aleksandardzoroski7769]

Why did you removed the safety capacitor that was a class y capacitor that is rated for 1000 volts or more and its there for safety and you removed it for no reasone

[@PhdHung]

I want to insulate between GND HV and GND LV. In my country, there is no earth wire.

[@T2D.SteveArcs]

@@PhdHung yeah it wont matter.... although the cap only allows microamps it can be at quite high voltage so can damage sensitive circuits and chips so can see why you would remove it

[@Zebra_Paw]

When removing it you get a lot of interference, and if you set 5V and charge a phone the touchscreen won't answer or very badly because of this interference! You need the class Y1 capacitor, and if you have no ground you can connect a 1M resistor between neutral and negative output (it will do the job but make sure it's NEUTRAL and NOT LIVE!)

[@Chathuwa.]

I need quick reply please.. I'm going to modify 24v 2.5 A adaptor the smd feedback resistor is 1k I removed it and hope to use 5k vr but what is the resistor I must use with vr

[@ajiikkuy8555]

Can change resistor 10k?

[@johnloydcruzz5733]

what vlue of other resistor you not mention @ 10:12

[@PhdHung]

4K7 for LED

[@jesusalvarezfebres6592]

there is an error in the connection point of the resistor R12, should be connected to the negative of Vout and not to the positive. on the other hand R14 is also badly connected.

[@Mraabdelhakim]

I did the same with Toshiba charger and managed to make variable adjustment to voltage but once it go under 13v it became unstable and drops to 0v and fluctuate between 24 to 0v until I change the pot, can this be fixed?

[@PhdHung]

Very difficult, you need rewinding the transformer.

[@lawrence5211]

Can I add a display to see the value

[@sahebkumarsaurabh9771]

Kya isse 24 volt lithium ion battery charge kr site hai?

[@stanygempisao9775]

can I help me change dc ac voltage is adapter charge to output 24v.

[@RixtronixLAB]

Creative video, thanks for sharing it :)

[@CarlosJimenez-tv6zh]

eres un mostro super eso hermanito

[@ahmedelnopy9353]

Perfect job 👌🏽.. So how about the amper.. How we can reduce it ? Thanks

[@tottimejdi5820]

no need to reduce amper

[@sigitpurwoko4123]

Mas bro... Aku ada liteon 19v 7,1a dimana nyari skemanya. Dari kemaren nyari belum ketemu.

[@PiterHutahaean]

Berapa nilai ohm resistor yang di buang...??

[@mahdialemi2742]

HELLO DEAR DELL LAPTOP HAS 3 WIRES FOR OUT PUT NOT 2 WIRE! WHY? TNX ADMIN

[@T2D.SteveArcs]

The third wire tells the laptop what charger is connected (90w 100w 120w etc) and that its a genuine charger or not

[@Zebra_Paw]

It doesn't matter, use the two wires you get 19V in between of!

[@chandruasp]

Nice works Am trying the same using delta 12v 1.6Amp EADP-18WP adapter PCB model started reworks working near opto coupler.

[@chandruasp]

I have done it successfully and plenty of verity of adapters such.

[@YouGamersYT]

I have a question i hope SOMEONE can answer. I have a dell G3 gaming laptop and the charger says 19.5v but can i use a gaming mouse (3v needed to run) and a gaming key board on it (5v needed) would I burn out my laptop??

[@mahdialemi2742]

hello in other words i want to use this for laptop but ican not because of 3 wire input laptop

[@PhdHung]

dell computer charger has 3 wires. +, - and PG. You can remove PG wire

[@Zebra_Paw]

@@PhdHung i got an HP one and it also has 3 wires (i don't want to kill it anyway i need it for the computer because the third wire tells the laptop it's not connected to any random power supply and if there is none it doesn't work so i can't use any charger! #SAD )

[@arashzergan3741]

Verey nice Cool 🤙

[@PhdHung]

thanks bro

[@michaelbarakat6095]

Excellent job 👌👍.... but it would be more safe if you pay attention for the UC3843 VCC as it would ramp up with duty cycle increase and may damage the chip so putting a Zener diode with UC supply voltage may help.... Thanks again for the great video it's really helpful ❤

[@PhdHung]

[@screen-protector]

I thought he'll modify PWM ;) signal and not a potentiometer at the output :D, an odd way to do it IMHO ;).

[@lawalmohammed83]

Please Sir could this modifications be made on every type of I9V switch mode adapter?

[@Wilson84KS]

Basically yes, aslong it uses the TL431, but need to understand the circuit to find it, also for safety, don't do something like that with electric stuff if you don't understand it, high or low voltage doesn't matter, it still can be very dangerous.

[@estrategia-mental]

Why remove capacitor?

[@Graydogz]

Hi man. just wondering if volts is going up is amps going down? i.e watts is staying the same? or does amps stay the same and watts is also going up? I need 10A 150W supply.

[@PhdHung]

when the voltage increases the current will decrease.

[@viswanathanramakrishnan7613]

Where's the point where you have fixed 750 ohms as per your alterations. Also thank you so much for providing the schematic diagram of the SMPS.

[@ahmedsoffy581]

good work . please can you make another one for small volts from 1 volt to 12 volt . with my pleasure

[@PhdHung]

ok

[@ahmedsoffy581]

@@PhdHungthanks

[@kengjung4191]

what is switching power mosfet number?..

[@apple_jack7145]

and how can i figured out witch is the feedback resistor can someone explain me? thx

[@المخترعالاردني-ط5ك]

you are creative

[@franciscogalindo1871]

Men como consigo echematic de una de 24v de impredora me podrias ayudar es para hacer una fuente de laboratorio tengo 2 iguales

[@Pilotfly2023]

Tks, friend!

[@ATechSolutions79]

I have a power supply with dual opto-coupler and I'm confused can you help me??

[@PhdHung]

Pls post pictures on FB group

[@ATechSolutions79]

@@PhdHung fb page name???

[@bellybhuli3504]

The biggest problem with this change is higher the voltage lower the current as watt would be fixed... How to address the issue...higher voltage with hiring the current?

[@DatManSteel]

Is there any way to control the amp

[@deone-entity3935]

12 to 220v?

[@keupondestroy911]

Merci pour la vidéo

[@dientu97]

Nếu sạc nó k dùg tl431 thì mod ntn ad ơi?

[@PhdHung]

hầu hết sạc lô là đều có, sạc zin thì mò đường hồi tiếp của nó rồi mod thôi.

[@dientu97]

Homemade 102 thanks ad!

[@jonisetiawan503]

Pa maaf saya mengikuti bapa canget bkas leptop pkai LM137 dan 2N3005 dari 19 vol busa turun jadi 1vol untuk servis hv tapi pa ngan bantuanya kenapa pA ga bisa 19 vol sesudah pjai Lm137 ic sebelum ic 137 bisa 19 vol gimana selusinya maaf?

[@variacoesbrecia]

please, type compnents changed.

[@adeaniteknik695]

👍👍👍👍👍

[@marlondiego4159]

so it was possible this high and low voltage because the power supply does not have overvoltage protection, others better mounted has protection and is possible only 4v down and 4 up

[@aleksandardzoroski7769]

Marlon Diego in that case you remove the overvoltage protection if it has some integrated chip for the working proces just diseable the pin for that and its done an if it isnt with a chip just short the two legs on the optocoupler on the primary side

[@arenasinda_kor_savasci]

27 voltta kaç amper veriyor

[@leozendo3500]

Well done.

[@PhdHung]

Thanks

[@zeefixhub]

how to have adjustable current?

[@darmarbera]

Watt would be same...higher the voltage lower the current...

[@PhdHung]

yes

[@TVTambangMineral]

mantabs bro