I suppose it reaches the maximum voltage of the adapter, in this case 12v or a little more. He's probably saying it's good for adapters up to 25v because he puts 25v capacitors. I don't consider it click bait, as it does give a way to get variable voltage up to the adapters voltage.
电源内变压器最大转换电压约是标称的2倍，并且要考虑高电压端的电压余量，所以用5V的电源只能最高调到10V左右，同时滤波电解电容器的容量和耐压应加大。 The maximum conversion voltage of the transformer in the power supply is about twice the nominal, and the voltage margin of the high-voltage terminal must be considered. Therefore, the 5V power supply can only be adjusted to a maximum of about 10V, and the capacity and withstand voltage of the filter electrolytic capacitor should be increased.
Convention has it that when a Pot is turned clockwise the output voltage (Vout) should increase not decrease as seen here. Swapping the two fixed wire nodes of the Pot will fix this.
Your not wrong, I rewired the pots in my mom's stereo to be left handed friendly (she's left handed) as a kid... the moral of that story was tangential but since I brought it up anyways... I learned that you should ask if people want a favor before you do it... she had gotten used to using them the normal way and it kept throwing her off, so she had me change it back. Also while technically a variable resistor in theory should work fine both ways, design is probably party informed by this convention thus they're designed to be used per the convention. Though I doubt that the design-informed-by-convention effect has had much or even any effect in the actual pots produced by the various manufacturers, so I can't see it being an issue, I'm just explaining the underlying principles of why we... you know what, I'm talking too much...
@@binaryglitch64 Are you perhaps a psychology student? I think you've over complicated a basic electronics convention. Whether it be controlling the brilliance of a lamp, the volume level of an audio amplifier or the Output voltage of a bench power supply the following is an accepted POT convention worldwide. Turning Clockwise = Increase Turning Counterclockwise = Decrease
It's not just convention. I reversed the gas valves on my stove. I have seen only one volume control wired up wrong. Hotel in Florida vacation and my dad blasted the TV every time he went to adjust it. Plumbing is where this got screwed (pun) up. They took a normal right hand thread and put it into a head and valve seat and now it works backwards. Electronic controls hadn't been invented yet. But now hear me out, if you have a logarithmic volume pot it will definitely be near useless backwards. Grant's mom knew something was not right, all the range was near the one wrong end. A linear pot would be better for voltage selection, where half way up is about half the voltage range.
The transformer was dedicated around the peak voltage ex 12V, you cannot increase or decrease the TL431 above 12 volts because the PWM IC pulse duty cycle will run out of range and stop oscillating.
^This^ Most people watching this stuff are looking to be as cheap as possible "I has old laptop or phone chargers! I don't need to pay $75+ for a proper adjustable PSU" and know very little about HOW switch mode PSU's work. Fixed output units are designed to be fixed output.. I mean I guess this would be fine for someone learning electronics to experiment with but not for someone looking for a bench PSU, definitely if one needs an LED light driver..
Sir, i have smps like yours, there already an adjustable potentiometer, but only adjust between 20v to 25v, so what can i do if i wan't to adjust voltage from 3v ?
I would also add a reversible barrel connector output from an adjustable 3,4.5,6,7.5,9 and 12volt barrel interchangeable wall power supply.That way you can power most low power electronics,and reverse the barrels if the tip is non standard negative.Some tips are negative for some reason.
Usually when you find the tips reversed its because the company wanted to make the PSU Proprietary so you can only get it from them. Any noob cake can simply cut/splice the wires in reverse. 😆
Very good. Best from you so far. The addition of a small volt metre module to the case would not go amiss. You have already shown where to connect one with the multi metre.
Hello, we have an agricultural land that has no electricity. Now, if we want to use a motorcycle battery, which is 12 volts, to get different currents, such as 10 or 12 amps, what transistor should we use?
You must be blind but if you go to minute 4 it'll show you where to connect them Right Next To Where he remove the two resistors ., so go get your prescription glasses and watch the video again peace❤
Great presentation. I'll still stick to the bench power supply that is less than $50 with all bells and whistles and have tested well by other UA-camrs
3:44 I am seeing a lot of questions about a higher voltage. it says to put a lower resistance in place of the 2.2k ( I have not tested it yet, it's just what says in the video )
На сопротивлении перепаяй провода, чтобы при вращении по часовой стрелке напряжение увеличивалось, а против уменьшалось. Так буде правильнее. И переменное можно взять с меньшими габаритами и поставит в центр корпуса во внутрь, а наружу вывести только ручку.
Hello. Thank you for this video. Like you, I modified a 12 volt charger using a variable resistance of 100 kilo ohms instead of 10 kilo ohms and a constant resistance of 20 kilo ohms instead of 2.2 kilo ohms. But that the experiment did not succeed, as the transistor of adapter was burned and I had a short circuit. Question: Why did this change not work? Thank you.
i only saw voltage go to 14 volts can it go up to 30 v? if not you can build one with a lm 317 right it's a good idea but seeing is believing and i didn't see voltmeter go to 30 volts
One of the wires connected to the potentiometer if the side was changed then the rising voltage would be clockwise instead of anti clockwise and that is more logical.
Já cheguei dando lique no vídeo, porquê já fiz esse esquema em três fontes dessas de com corrente de 3amperes e utilizo pra testar equipamentos. Parabéns 👏👏👏👏👏 TMJ.
good work, I think this should be tried at home. Make a tool for simple purposes, such as controlling the rotation of a small motor. I will see another video on your channel. Thank you sir 🤝
Well done the pinnacle of creativity and professionalism. I hope you will explain to us how to modify all types of power supply so that the voltage becomes variable by means of a variable resistance. Computer Power Supply. And so forth. Thank you from the heart 🌹
Some sticky tape should be sticked on to the shaft of the motor to show its rotation with the varying voltage. Otherwise the rotation speed cannot be seen while demonstrating it.
You can put some acetone or thinner in the área that the parts come together, wait for a minute and try to open. It is easier and more accurate using a seringe to do this.
it'll be whatever the original label states, but also the maximum wattage is a limit if set to higher voltage than original, so if original is 12v 2amp thats 24 watts, if set to higher voltage, such as 24v, max current will be 1 amp, you may think you could get 4amp when at 6volt output but very unlikely, current is limited by wire size in the transformer and rectifier type
Very good idea!! I have make it with a 1K smd resistor and a 10K potentiometer and i have a 3-25V power supply !! In the lowest voltages i have a ripple, can you tell me why?
PWM is not oscillating properly. This is to be expected when you do things like this. Stability gets thrown out the window along with safety and reliability.
@@Elfnetdesigns but what about thats power supply sourse's that has not pwm driver chip? . my is that😒... so i dont wanna less volts, i want upper from 12v to 24 . what it will be ? .. pd : im sooooo poor 'cause neither i havent an osciloscope 😭 🇵🇪🇵🇪🇵🇪🇵🇪🇵🇪🇵🇪
bende dijital frekanslı alan tarama var altın gümüş ve boşluga nokda yapdıgında ikaz verecek ne yapabilirim veya siz yapıp bana gönderebilirmisiniz bi yardımcı olursanız şimdiden teşekkür ederim
Nice video. However, it could be more clear that opening a power supply like this is very dangerous due to the rectified high voltage. It could lead to death for anyone touching metal parts of the inside or the potentiometer on the outside if soldering is bad or incorrectly done.
Tengo varias fuentes ,pero no como modificarlo a fuente variable , de 20 voltios,5 amper ., Si se electrónica , pero no se en que parte pone los condensadores, resistencias ., No se ingles , NO SE VE CLARO.
it will. but the best psu u can modify is playstation 2 slim power addapter. it can reach 40 volts and go down to 4 volts with good power output. just find orginal one.
идея давно известная. У русских блогеров подобное можно найти немало за последние 20 лет на ютубе (и не только). Но за популяризацию электроники - лайк.
@@МолотыйЛиббентроп напряжение где мерял? если без вариорезистора, то будет стабильно какое-то одно (жестко определяемое делителем напряжения на постоянных резисторах). Если как на видео, то будет варьироваться вероятно даже до 25в, т.к. регулируется ШИМ по первичке. Хотя судя по всему нужно отправить тебя к Доктору Дью или спросить "ты точно понимаешь в электронике? "
@@eugenrussia7155 я не электронщик, я только учусь. Вот вышел на пенсию и от безделья занялся всякой хернёй. Что за доктор Дю? Про переменный резистор понятно, но без дополнения в схему элементов, повышающих напряжение, разве можно его получить выше дефолтного, впаяв переменный резистор? Может я видео невнимательно посмотрел, вполне возможно.
@@МолотыйЛиббентроп Про ИБП проще прочти статьи в нэте (с того же журнала Радио и т.п.) тогда поймешь, что та принцип работы другой. По простецки: изначально на вторичке там примерно в 2-3 раза выше напряжение, которое по сути и задавливается до нужного (стабилизируется) применением стабилитрона или управляемого стабилитрона (как на этом видео). потому естественно, что применяя переменный резистор можно подавать на выход и меньше номинала и выше номинала исходного ИБП. Как бы для электронщика это вполне естественное явление в импульсной технике
The circuit goes to 15 volt, but video title says up-to 25 volt, so why it comes?
yes, fraud video
When circuit fails
Its called Click bait
I suppose it reaches the maximum voltage of the adapter, in this case 12v or a little more. He's probably saying it's good for adapters up to 25v because he puts 25v capacitors.
I don't consider it click bait, as it does give a way to get variable voltage up to the adapters voltage.
Add 3.2k resistance parallel to 2.2k nothing but reduce ref point to ground resistance less than 1k
عمل جيد وصحيح جربت سابقا هذا التحوير في عدة بور سبلاي ونجحت هذه الطرقة احسنت👍👍👍
🙂🙋♂️👍👏
电源内变压器最大转换电压约是标称的2倍，并且要考虑高电压端的电压余量，所以用5V的电源只能最高调到10V左右，同时滤波电解电容器的容量和耐压应加大。
The maximum conversion voltage of the transformer in the power supply is about twice the nominal, and the voltage margin of the high-voltage terminal must be considered. Therefore, the 5V power supply can only be adjusted to a maximum of about 10V, and the capacity and withstand voltage of the filter electrolytic capacitor should be increased.
补充一下，下面电阻应该1KB才对，否则理论上最高电压只有13.86V左右
To add, the following resistance should be 1KB, otherwise the theoretical maximum voltage is only about 13.86V
👍👏Thank you!
Convention has it that when a Pot is turned clockwise the output voltage (Vout) should increase not decrease as seen here. Swapping the two fixed wire nodes of the Pot will fix this.
Your not wrong, I rewired the pots in my mom's stereo to be left handed friendly (she's left handed) as a kid... the moral of that story was tangential but since I brought it up anyways... I learned that you should ask if people want a favor before you do it... she had gotten used to using them the normal way and it kept throwing her off, so she had me change it back. Also while technically a variable resistor in theory should work fine both ways, design is probably party informed by this convention thus they're designed to be used per the convention. Though I doubt that the design-informed-by-convention effect has had much or even any effect in the actual pots produced by the various manufacturers, so I can't see it being an issue, I'm just explaining the underlying principles of why we... you know what, I'm talking too much...
@@binaryglitch64 Are you perhaps a psychology student? I think you've over complicated a basic electronics convention. Whether it be controlling the brilliance of a lamp, the volume level of an audio amplifier or the Output voltage of a bench power supply the following is an accepted POT convention worldwide.
Turning Clockwise = Increase
Turning Counterclockwise = Decrease
@@cdrive5757 see told ya... talking too much.
It's not just convention. I reversed the gas valves on my stove. I have seen only one volume control wired up wrong. Hotel in Florida vacation and my dad blasted the TV every time he went to adjust it. Plumbing is where this got screwed (pun) up. They took a normal right hand thread and put it into a head and valve seat and now it works backwards. Electronic controls hadn't been invented yet. But now hear me out, if you have a logarithmic volume pot it will definitely be near useless backwards. Grant's mom knew something was not right, all the range was near the one wrong end. A linear pot would be better for voltage selection, where half way up is about half the voltage range.
The transformer was dedicated around the peak voltage ex 12V, you cannot increase or decrease the TL431 above 12 volts because the PWM IC pulse duty cycle will run out of range and stop oscillating.
^This^
Most people watching this stuff are looking to be as cheap as possible "I has old laptop or phone chargers! I don't need to pay $75+ for a proper adjustable PSU" and know very little about HOW switch mode PSU's work. Fixed output units are designed to be fixed output..
I mean I guess this would be fine for someone learning electronics to experiment with but not for someone looking for a bench PSU, definitely if one needs an LED light driver..
@@Elfnetdesignsi think adjustable regulators are cheap
So cannot work properly between 5V and 12V?
Sir, i have smps like yours, there already an adjustable potentiometer, but only adjust between 20v to 25v, so what can i do if i wan't to adjust voltage from 3v ?
I would also add a reversible barrel connector output from an adjustable 3,4.5,6,7.5,9 and 12volt barrel interchangeable wall power supply.That way you can power most low power electronics,and reverse the barrels if the tip is non standard negative.Some tips are negative for some reason.
Usually when you find the tips reversed its because the company wanted to make the PSU Proprietary so you can only get it from them. Any noob cake can simply cut/splice the wires in reverse. 😆
you are a very talented man too bad I didn't have the chance to know you before but hey now I start watching from the first video good luck
Very good. Best from you so far. The addition of a small volt metre module to the case would not go amiss. You have already shown where to connect one with the multi metre.
🙂🙋♂️👍👏
Hello, we have an agricultural land that has no electricity. Now, if we want to use a motorcycle battery, which is 12 volts, to get different currents, such as 10 or 12 amps, what transistor should we use?
IRF3205 can handle that current.
you didn't show where in the circuit you place the variable resistor. I'm guessing is somewhere on the output, but where?
You must be blind but if you go to minute 4 it'll show you where to connect them Right Next To Where he remove the two resistors ., so go get your prescription glasses and watch the video again peace❤
Great presentation. I'll still stick to the bench power supply that is less than $50 with all bells and whistles and have tested well by other UA-camrs
3:44
I am seeing a lot of questions about a higher voltage.
it says to put a lower resistance in place of the 2.2k
( I have not tested it yet, it's just what says in the video )
На сопротивлении перепаяй провода, чтобы при вращении по часовой стрелке напряжение увеличивалось, а против уменьшалось. Так буде правильнее. И переменное можно взять с меньшими габаритами и поставит в центр корпуса во внутрь, а наружу вывести только ручку.
А у них всё так. Да из-за трёх вольт стоило-ли заморачиваться.
Claro que funciona
Yo lo hice también
Y me llegaba hasta 27 voltios
wasn't enought remove just one resistor instead two?
Reading all the comments, it transpires that the viewers are more knowledgeable than the pseudo expert.
How long can it sustain power with some components over heating.
👌🏻👌🏻👌🏻👌🏻👌🏻👌🏻👌🏻👌🏻👌🏻👌🏻 God definitely gives something different art who can't speak and hear like you..
But very sad you can't speak..😔
Without a proper DC load tester how can you determine the current load?
Awesome 👍😊👌 bro keep it up and love from BANGLADESH 🇧🇩🇧🇩🇧🇩
🙂🙋♂️👍👏
i saved this video in my profiles . every week i enjoyed and watch it . i think its great
Hello. Thank you for this video. Like you, I modified a 12 volt charger using a variable resistance of 100 kilo ohms instead of 10 kilo ohms and a constant resistance of 20 kilo ohms instead of 2.2 kilo ohms. But that the experiment did not succeed, as the transistor of adapter was burned and I had a short circuit. Question: Why did this change not work? Thank you.
If you were to act exactly like this method, it wouldn't matter, your device will burn again soon! Read the comments!
Super idea. question: sorry but the led must be soldered and why?
I think that was just to signal power was on but then in the video it is no more shown
do you use an adapter for a laptop or a cctv adapter?
I love your work. I subbed immediately. Cheers from Australia
Welcome
i only saw voltage go to 14 volts can it go up to 30 v? if not you can build one with a lm 317 right it's a good idea but seeing is believing and i didn't see voltmeter go to 30 volts
what esquem eletric??
What about the amperage, does it go down or up?
So would this make a solid variable DC power supply for the electronics bench?
So your adding a variable potentiometer to the output leads?
no, he added the potentiometer to the voltage divider the TL431 refrences.
Hi. What fusible use this adapter?
does the amperage value decrease. if the volt is increased the voltage
تيار يبقى نفسه اذا كان 5 يبقى خمس وعند رفع فولت اكثر يقل تيار ويبدا ضغط على الموسفت
Nicely done. Add a load on/off switch and a tiny little V/A meter and you’ve got it.
Good idea but you should interchange the input and ground so that while rotating clockwise voltage should increase.
Actually, just switch the green wire (see at 3:54) to the other side (free terminal) of the pot.
Yes correct the open end of pot need to shot with mid pin.
👍
One of the wires connected to the potentiometer if the side was changed then the rising voltage would be clockwise instead of anti clockwise and that is more logical.
is it safe to run 12v dc fan on 15 or 16 v power supply?
Can i use 1.2k resistor instead 1k resistor , the 1k resistor not available at a shop
Yes. Would not change that much.
However, this source should be unstable, so better buy already variable one.
I wonder how many house fires this video has been responsible for
I know ehh. Blatant disregard for safety and poor choice in music. Over a million views and shit gear/production.
Possible to modify for 72V?
Já cheguei dando lique no vídeo, porquê já fiz esse esquema em três fontes dessas de com corrente de 3amperes e utilizo pra testar equipamentos. Parabéns 👏👏👏👏👏 TMJ.
sabe se consigo em fonte de notebook de 19 volts ?
🙂🙋♂️👍👏🙂🙋♂️👍👏
@@michaelnoardo3315 tô tentando com fonte de notebook vc conseguiu?
@@elisilva5323 não tentei ainda... Tenho umas 10 aqui de 19 volts e 5 amps
@Paulinho Finho Não
The variable voltage pot. is wired backwards
At the moment I'm using 12 different voltage adaptors...your Pot needs to be lockable to be practical. Bumping that knob could be ruinous.
good work, I think this should be tried at home. Make a tool for simple purposes, such as controlling the rotation of a small motor. I will see another video on your channel. Thank you sir 🤝
Well done the pinnacle of creativity and professionalism. I hope you will explain to us how to modify all types of power supply so that the voltage becomes variable by means of a variable resistance. Computer Power Supply. And so forth. Thank you from the heart 🌹
Professionalism. LMAO yeah ok. Only thing these people are pros at is running video farms and scammy call centers
Excellent ! Keep up the nice work ! You can also add a mini LED voltmeter on the case to monitor the voltage
@Neil Bridger u are full of shit
@@dwgwnr1969 lol no he's not
Some sticky tape should be sticked on to the shaft of the motor to show its rotation with the varying voltage. Otherwise the rotation speed cannot be seen while demonstrating it.
its work on laptop charger?
I did same but not getting exactly, perfect from 9-24 v, but fluctuating below 9 v. Any help ?. Thanks in advance.
Same here😂😂😂
¿Después de hacer la modificación se mantiene la misma corriente (5A)?
Hello. Thank you for sharing. The output is 3V to 15V right? Not 3V to 25V, ok?
Birşey soracağım 2.2k direnç neden koydun oraya
very nice...how did you learn about this...??/
how Much current it can deliver with 19v , ?
How can we control the current.?
Selam kardesim
Sen kilipin titrinde yaziuoruz ( 3v _ 27 volt)
Amma , test ediuroz da ki ( 14 voltta) kader gelmadi
Bu ne is?
I have opened hundreds of adapters and NEVER has one been that easy lol. Nice idea tho
You can put some acetone or thinner in the área that the parts come together, wait for a minute and try to open. It is easier and more accurate using a seringe to do this.
Do you have a Rumble channel???
It would be great if you can adjust the amparage from 1-10A for example
Depend of amperaje of they eliminator example uf si 3a maximus is 3amp
@6GDC i m sure that tiny supply has at less 6A of current becoming from mosfet 😁
@Andrew_koala Here in mexico, cuurent and amps is the same, but tank, y saludos
What is it with these videos and the filthy / worn out soldering iron tips?
hocam smd tl431 olan bir 9v adaptörün direnç değerlerini değiştirerek 12v seviyesine çıkardım....ama yüke binince voltaj sıfırlıyor boşta sıkıntı yok enerjiyi kesip tekrar veriyorum 12v geliyor...velhasıl yükte çalışmıyor çözüm nedir veya sorun nedir tşk ( adaptör 9v kendi değerinde yükte çalışıyor )
Excellent work bro you have my respect in Tech
Capacitor Kesse lagaane ka circuit me dikhaya hi nahi..? Usme 2 different tha na?
بله درسته کاملا منطقیه من خودم با مقاومتهای ثابت چندین بار برای اهداف لازم و البته ولتاژ ثابت فقط جهت تغییر ولتاژ انجام داده ام و درست هست🌹🌹🌹
greatly appreciate this video having a few of these around will be handy even if they only hit 16v
12volt power supplies can go 20volts but can be boosted a little bit, like 22Volts
And what about current adjustment ?
I See, You do work, Very good. I am from LAOS PDR. Thaks. For information
Tour soldering technique sucks but worse is your voltage goes up aS you turn t CCW ?
Super idea!
Nice but One question: Where is The volt and amp Meter?? Or It Can Not fit And You Use multimeter instead, Okay Now I Know Why.
PORQUE NÃO FEZ UM FURO PARA COLOCAR O POTENCIOMETRO DIREITO SEM ESSA GAMBIARRA DE COLA QUENTE?
There's not enough place bro
It is a good idea, but the power does not exceed 15 v, whereas the original power is stated as 16 v. Your title of this video mentions ( 3-25 )v.
Clickbait
how too add amperage boss
25V ?
It said to replace one of the resistors with a lower resistance for a higher voltage. ( I have not tested it yet )
very nice perfect but can you tell me maximum ampere in output ? its very important
it'll be whatever the original label states, but also the maximum wattage is a limit if set to higher voltage than original, so if original is 12v 2amp thats 24 watts, if set to higher voltage, such as 24v, max current will be 1 amp, you may think you could get 4amp when at 6volt output but very unlikely, current is limited by wire size in the transformer and rectifier type
Can you change the amperage ?
Very good idea!! I have make it with a 1K smd resistor and a 10K potentiometer and i have a 3-25V power supply !! In the lowest voltages i have a ripple, can you tell me why?
PWM is not oscillating properly. This is to be expected when you do things like this. Stability gets thrown out the window along with safety and reliability.
@@Elfnetdesigns but what about thats power supply sourse's that has not pwm driver chip? . my is that😒... so i dont wanna less volts, i want upper from 12v to 24 . what it will be ? ..
pd : im sooooo poor 'cause neither i havent an osciloscope 😭 🇵🇪🇵🇪🇵🇪🇵🇪🇵🇪🇵🇪
12 volt 5 Ampare adaptor modified . Then what Ampare will output ??????Can Ampare change ???
you must dont use resistor to change v or i directly they consume and convert to heat current
com fonte de 19.5v para de 3 a 20v de not?
I wrote in the title of the video from 3 volts to 25 volts, but the voltage only reached 15 volts
No me sale. Me pierdo en las pistas u no puedo identificar esas dos resistencias
25v??
excuse me chief when you have the time can you add a voltmeter display thank you very much
Not every PSU can work witch that low voltage. It depends of controller chip.
Can i also control ampere?
Kind of strange to have the potentiometer set up for higher voltage when turned counter-clockwise... opposite to almost every 'convention' !
capacitors must be low ESR and 105 degrees or they will boil
bende dijital frekanslı alan tarama var altın gümüş ve boşluga nokda yapdıgında ikaz verecek ne yapabilirim veya siz yapıp bana gönderebilirmisiniz bi yardımcı olursanız şimdiden teşekkür ederim
I did the same mod but I can't go below 7 volt...why?
The duty cycle of your smps has reached the minimum duty cycle at 7v.
Max voltage?
Where is the location of the LED welding .... Give us the whole chema
🙂🙋♂️👍👏
Thanks for this nice work.
Nice video. However, it could be more clear that opening a power supply like this is very dangerous due to the rectified high voltage. It could lead to death for anyone touching metal parts of the inside or the potentiometer on the outside if soldering is bad or incorrectly done.
Tengo varias fuentes ,pero no como modificarlo a fuente variable , de 20 voltios,5 amper ., Si se electrónica , pero no se en que parte pone los condensadores, resistencias ., No se ingles , NO SE VE CLARO.
if you use solder wick it will be more easy for you to remove those
I think cost is a major issue. Even to the extent of preserving old solder. But being 'tight' maybe just an asian thing 😉
Bayie how how make 24 volt dc battery into 12 volt dc plz plz and output put capacity 15 led dc
Amps rating please.
Using 12v 5a adapter
@@TechIdeasAG which condition no load or load because it matters
Would really like to see something for 120V DC to 240V DC range for a project I am working on.
How to ampere control
will laptop charger work
it will.
but the best psu u can modify is playstation 2 slim power addapter.
it can reach 40 volts and go down to 4 volts with good power output.
just find orginal one.
идея давно известная. У русских блогеров подобное можно найти немало за последние 20 лет на ютубе (и не только). Но за популяризацию электроники - лайк.
согласен. и что-то не видно, чтобы напряжение было 25В. только 16, кажется. да и как оно может увеличиться, если БП на 12В всего?
@@МолотыйЛиббентроп напряжение где мерял? если без вариорезистора, то будет стабильно какое-то одно (жестко определяемое делителем напряжения на постоянных резисторах). Если как на видео, то будет варьироваться вероятно даже до 25в, т.к. регулируется ШИМ по первичке. Хотя судя по всему нужно отправить тебя к Доктору Дью или спросить "ты точно понимаешь в электронике? "
@@eugenrussia7155 я не электронщик, я только учусь. Вот вышел на пенсию и от безделья занялся всякой хернёй. Что за доктор Дю? Про переменный резистор понятно, но без дополнения в схему элементов, повышающих напряжение, разве можно его получить выше дефолтного, впаяв переменный резистор? Может я видео невнимательно посмотрел, вполне возможно.
@@МолотыйЛиббентроп Доктор Дью - набери прямо так в нэте и не промахнешься. Это юморной канал от Матвеева Евгена (канал основной Питстоп - про авто).
@@МолотыйЛиббентроп Про ИБП проще прочти статьи в нэте (с того же журнала Радио и т.п.) тогда поймешь, что та принцип работы другой. По простецки: изначально на вторичке там примерно в 2-3 раза выше напряжение, которое по сути и задавливается до нужного (стабилизируется) применением стабилитрона или управляемого стабилитрона (как на этом видео). потому естественно, что применяя переменный резистор можно подавать на выход и меньше номинала и выше номинала исходного ИБП. Как бы для электронщика это вполне естественное явление в импульсной технике