Thank you my brother. You are truly amazing.

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

Thanks for explanation it very illustrated my brother

Nice upgradation video . I liked it.

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

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.

Good information about regulating SMPS power supply, Thanks

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

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

2 жыл бұрын

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

Жыл бұрын

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

This project is very good!

can you add a pot for the current?

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

3 жыл бұрын

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

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.

Creative video, thanks for sharing it :)

Thank you my brother from egypt

Bạn ơi bạn làm rất hay và chuyên nghiệp

Thank you profe good video

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

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

@chandruasp

3 жыл бұрын

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

Good..genius...

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

Ótima sugestão. Like.

@PhdHung

4 жыл бұрын

How many amps is the output 5-30 volts ?

Thanks man

Verey nice Cool 🤙

@PhdHung

5 жыл бұрын

thanks bro

eres un mostro super eso hermanito

Well done.

@PhdHung

4 жыл бұрын

Thanks

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

3 жыл бұрын

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

3 жыл бұрын

​@@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.

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

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.

Good tiching karte hai 👌👍👍👍👌👌👌👍

Does it do for 12 batt adaptor

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

3 жыл бұрын

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.

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

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

@chandruasp

3 жыл бұрын

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.

you are creative

Tks, friend!

Merci pour la vidéo

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

Good job!

@PhdHung

3 жыл бұрын

Thanks bro

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??

Thanks a lot for share the details with us.

@PhdHung

3 жыл бұрын

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

4 жыл бұрын

@screen-protector

Жыл бұрын

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

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

Obrigado amigo.

Sir will the output current remain the same or change.

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

mantabs bro

Depois você poderia fazer o mesmo com uma fonte ATX se é que já não fez. Se puder, você pode compartilhar o código C do firmware do inversor com Arduino? Quero estudar o código para tentar entender o funcionamento. Grato.

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

@PhdHung

4 жыл бұрын

Of course

@Zebra_Paw

3 жыл бұрын

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

ohh so good job

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

is that power supply can charge the battery??

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.

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

3 жыл бұрын

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

@joshuvajohnvarghese2372

2 жыл бұрын

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.

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

@tottimejdi5820

3 жыл бұрын

no need to reduce amper

Top

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

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

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

Is there any way to control the amp

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

4 жыл бұрын

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

@PhdHung

4 жыл бұрын

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.

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

4 жыл бұрын

Remove resistors connected to gnd. Find it near tl431

@sam-mr9nz

4 жыл бұрын

@@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.

Жыл бұрын

Did you removed the cap ?

@Chathuwa.

Жыл бұрын

I mean miler cap

Nice

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

Жыл бұрын

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.

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

👍

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

@PhdHung

4 жыл бұрын

I removed the feedback voltage resistor and replaced it with potentiometer

@juliusparker3039

4 жыл бұрын

Which and which are the value of former feedback resistor

@vickyhackz6505

4 жыл бұрын

5k

Nice video

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

@PhdHung

5 жыл бұрын

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

@443DM

4 жыл бұрын

@@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.

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?

Muito bom amigo .Show

👍👍👍👍👍

hola una pregunta se puede aser con cargador universal

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

3 жыл бұрын

resistor 4k7 for LED :D

Saludos . Amigo ise es trabajo para usarlo para cargador de pila lifapo4 y la rebaje a 14.5 vol pero se protege y se dispara el cargador

Mantap master

@PhdHung

3 жыл бұрын

thanks bro

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

4 жыл бұрын

Very difficult, you need rewinding the transformer.

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

@Wilson84KS

3 жыл бұрын

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.

what is switching power mosfet number?..

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

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

@PhdHung

3 жыл бұрын

ok

@ahmedsoffy581

2 жыл бұрын

@@PhdHungthanks

how to have adjustable current?

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

@sam-mr9nz

4 жыл бұрын

Me too

Hi how can i add current limiter in this laptop charger? About 2 to 3 amps

@PhdHung

3 жыл бұрын

here 320volt.com/en/battery-charger-with-flyback-smps-mod/

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

4 жыл бұрын

when the voltage increases the current will decrease.

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

@PhdHung

3 жыл бұрын

If the resistance is large, the voltage increases

@Zebra_Paw

3 жыл бұрын

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

💯💯💯

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

@PhdHung

4 жыл бұрын

cái này dễ mod lắm anh

@KinhKha-lm2zl

4 жыл бұрын

@@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

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

3 жыл бұрын

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.

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

4 жыл бұрын

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

4 жыл бұрын

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

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

3 жыл бұрын

67,2 ? for what?

I have 24vDC 2.5A adapter and I doing as show in video but out is 5vdc

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

Like!! Like!! Good idea!

Chào bạn, bạn co thể giúp minh xác định con điện trở feedback trên adapter của mình dc k ah?

Can change resistor 10k?

Dont need to remove vlue capicitor, you just find tl431 pin resistance and. Just remove it. Further change capicitor and use only one capicitor 1000 uf 50v or 100v. Its work best.

@81formann

Жыл бұрын

Why only one cap? Two small provide better filtering and is often easier to fit. But 50v rating provides some extra headroom and is smart considering the operating conditions in these non-ventilated units. 100v is just a waste of money and would not fit inside the case. You cant substitute voltage rating for capacitance. If your goal is improved filtering you could relocate the last cap to the unused V-2 and V+2 points, cut the positive trace right after the original location of 2nd cap and bridge with an inductor. This would be a huge improvement as far as noise go. If you want, you can think of it like only one capacitor... just with an added L2 filter. That being said, dirt cheap capacitors have no place in these things. Two high quality 50v 470uf with 105c rating is about $1. If you are going to use these things as a variable PSU for projects and testing, filtering is important and even crucial when dealing with ICs and microcontrollers.

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

3 жыл бұрын

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

@TeardownOZ2CPU

3 жыл бұрын

@@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

3 жыл бұрын

thanks. I know that.