May be a schematic would be helpful

Great idea. I never thought of this. The TL431 shunt regulator is in almost all power supplies for regulating the output voltage. I will have to keep this in mind next time I need to change the voltage on a laptop power supply. I salvage these when ever I can from folks who just throw everything away or I get them for a dollar from thrift stores. Great high amperage PSUs. Great PSU for powering LED circuits.

If you need 14.5k of resistance, and already have a 27k SMD resistor in-place, you could have soldered another 33k resistor on top, or with a 1/8w axial resistor between two existing pads that are electrically connected. Then you'll have 14.85k Ohm, without having to painfully remove that SMD resistor. And quick and easy to change it back to factory voltage without finding that darn tiny resistor you took out.

I just increase voltage on 12 V adapter so i have 13.5 v charger for fusion splicer .Thank you for sharing this. very nice tutorial

it's work for me :) the test with water is very ingenious thank you

Very informative video, thank you as I learned something new today.

Great video! Clear and efficient!

Any change in output current after you replace the resistor? Thanks for sharing.

Yeaaaa .. loved that black probe xD

ii have a charger it dropped from 20v to 5v tks looking for a fix

amazing video

Wondering if someone can help me change the voltage from a li-ion charger from 54.6 to 52v. I do have soldering skills, just not the skills to figure how to do the convert(what to change and where)

Very gud video ..Thanks

Nice and excellent video

Thank you pro

are we able to run (240 volt 50 hz 10 w input requirement) wire trimmer from this 19 v adaptor ?

hello please I want to change the voltage of HP adapter(model: series ppp014) from 19V, 4.7A to 12V, 500mA '. Which resistor will I replace and with what value of the resistor

I've modified a 19V laptop AC adapter to 12V but the output is unstable. How do I make it stable 12V?

Excelente

I want to know the power supply 19v can change the 12v battery.

very good

Thanks you ❤️

Can i use this 12v charger in a 12v motorcycle battery to charge it?

Sir I have hp computer charger which provides out put supply 19 volt but I require only 12 volt .please guide possitivily.hope you will definitely answer.

Thank you

What's the formula for calculating the resistance you need for a desired voltage?. I would like to try and get 15 volts or 8 volts. Thank you!!!

Sir Thank you my laptop adapter out put is 19.4 but know its coming 21.4 laptop display also not coming sir and power supply So can I try this method to my adapter or any component I want to change please tell me in reply sir Thanks again

Good view

Helpful

I'm trying to lower the voltage according to your video. One question before I to do so is why decrease the resistor instead of increase it to lower the voltage? I'm worried and want to make sure to avoid any accidents may occur. Thank you.

Hello! The original output of my adapter was 24v. I dropped it to 19v. But the output voltage is not stable. It fluctuates between 17 volts and 19 volts. Why?

অনেক অনেক সুন্দর ভাবে দেখানো হয়েছে ও বুঝিতে পারি লাম

what is that transparent stuff? that suddenly it lowers the voltage for a moment in 5:18

18v adapter me mujhse resister lost ho gya h please mujhe bataeiye ki kha or kitne om ka lagega

?19.5 volt to convert 14.4volt .. which resisitr will be use to make it battery charger ??

?for 14.4 volt which resistr will be use????

+1 nice

I want 48 voltage, how to do this?

Nice vid I have a question could a charger that is giving 18V on a computer that calls for 19V, mess up the battery ?

Good

Oki merci

👍👌

How did you open it?

is it possible to do the reverse? i.e. 12V to 14V

12 volt +14.50ko Kon si resistor he plez bolo ji

What resistor would i need too vonvert too 14.8 volts

I often go to Vietnam

Sir ap ki video bht achi ha Kea es supply k input volts ko km kea ja sakta ha 16_200 volt dc pa on ho jay or output pa 12 volt

There are so many resistors near the transistor.. which one to remove pls reply 😕

Sir kya 12 v 100 amp battery per laptop total use krskte hn bagair 220 k?

hi .. if I want to get any voltage at out put for ex: 7v ...9v etc , how can get that voltages ...?

is this stable?

👍👍👍

In other words, how do I get any voltages I want on the output and how do I determine the exact resistance to them, is there a specific way ..?

can we control the voltage where 2 optocoupler inserted

My 12v 2 amps adapter gives 16v at start and then going to fall and fall down how can i solve this please reply me soon

need help with my bosch gml50 radio .went crazy after year on the attic. All buttons works randomly round ones volume and station change 🤔any clues how to fix it ?please please please 👍😉

14.50 ko resistor ?????

or just make an external board with multiple resitors and a switch to change the voltage so u dont have to open the adapter and it will serve you without soldering every time u need different voltages.

12 volt + 14.50 ko resistor full details

Too good....but too difficult...!

Irni mehnat krne se acha isme 3ohms ke 2 resistors series mai laga lete

12 volt +14.50 ko resistor iquvalence

Use a potential meter aur a variable resistance along with 10ohm resistance in series and you can obtain desirable voltage 3 to 24 v

...but you will make the transformer heat up more by doing that.

Cut out the noise.

I got into high voltage prob then when my plug my charger my house lights and everything shuts off what this means can anyone know.

well i want 22 volt

Salut S.v.p auto-radio peugeut 308 blouquer sur mode silence pas de son Le volume ne fonction pas Pas de son Comment deplouquer le mode silence

لن نسمعك ياخي.

what a mess

So much time wasting then you dont show the important bits like how to open case??