Turn any fixed voltage adapter to variable voltage output (3v - 25v)
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- เผยแพร่เมื่อ 20 ธ.ค. 2020
- How to turn any SMPS adaptor's output voltage variable.
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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. 😆
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
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 TH-camrs
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.
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.
🙂🙋♂️👍👏
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
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 ?
عمل جيد وصحيح جربت سابقا هذا التحوير في عدة بور سبلاي ونجحت هذه الطرقة احسنت👍👍👍
🙂🙋♂️👍👏
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
i saved this video in my profiles . every week i enjoyed and watch it . i think its great
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.
So would this make a solid variable DC power supply for the electronics bench?
I love your work. I subbed immediately. Cheers from Australia
Welcome
Nicely done. Add a load on/off switch and a tiny little V/A meter and you’ve got it.
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
Super idea!
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
¿Después de hacer la modificación se mantiene la misma corriente (5A)?
very nice...how did you learn about this...??/
Awesome 👍😊👌 bro keep it up and love from BANGLADESH 🇧🇩🇧🇩🇧🇩
🙂🙋♂️👍👏
Excellent work bro you have my respect in Tech
Great work. I am impressed with the idea. Kindly how can one make a ±3V dual dc Power Supply
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
How long can it sustain power with some components over heating.
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 🤝
Thanks for this nice work.
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 😭 🇵🇪🇵🇪🇵🇪🇵🇪🇵🇪🇵🇪
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
do you use an adapter for a laptop or a cctv adapter?
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
perfect work thank you brother ,. i learned so much from you thanks . l like it
Can you change the amperage ?
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❤
Thank you for sharing sir new supporters here
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.
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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.
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.
Without a proper DC load tester how can you determine the current load?
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.
Great job.. So how about AH.. 🙏🏾
Excellent
is it safe to run 12v dc fan on 15 or 16 v power supply?
Great job sir.. I didn't have any idea about that technique.. My question is so how about the amper ? 🙏🏾
Thanks 👌
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.
Can i also control ampere?
Bạn làm rất hay đó và chuyen nghiệp rất thích
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
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.
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!
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🌹🌹🌹
Good 👍
Capacitor Kesse lagaane ka circuit me dikhaya hi nahi..? Usme 2 different tha na?
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
How can we control the current.?
Great bro
Good job
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
anta yudi
The word is CURRENT not amperage.
Current is measured in Amps.
You should read more to better learn the correct terminology.
@6GDC i m sure that tiny supply has at less 6A of current becoming from mosfet 😁
@@andrew_koala2974 Here in mexico, cuurent and amps is the same, but tank, y saludos
Wow nice
I See, You do work, Very good. I am from LAOS PDR. Thaks. For information
Hello. Thank you for sharing. The output is 3V to 15V right? Not 3V to 25V, ok?
Amazing
Merci pour la vidéo
The variable voltage pot. is wired backwards
12 volt 5 Ampare adaptor modified . Then what Ampare will output ??????Can Ampare change ???
amazing
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.
selamlar çok güzel bir çalışma bilgi ve emeğinize çok yeşekkürler..
🙂🙋♂️👍👏
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 )
Thanks man
Bayie how how make 24 volt dc battery into 12 volt dc plz plz and output put capacity 15 led dc
Muito bom
Creative info, thanks for sharing :)
Keep up continue
Possible to modify for 72V?
Nice job. Thanks.
Nice
Very good
what esquem eletric??
Y la intensidad cómo la controlamos?
Hi. What fusible use this adapter?
com fonte de 19.5v para de 3 a 20v de not?
how too add amperage boss
Proper current load dikhaana chahiye, ammeter se. Kitna maximum current possible hai. Motor se kuch nahin confirm hota.
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
Great vide, I subscribed to the channel.
Birşey soracağım 2.2k direnç neden koydun oraya
I did same but not getting exactly, perfect from 9-24 v, but fluctuating below 9 v. Any help ?. Thanks in advance.
кстати потенциометр - отклеится от корпуса после первого реального нагрева этого блока питания
Valeu!!
good job
Ok felicitari
And what about current adjustment ?
I wonder how many house fires this video has been responsible for
Saved my day!
thanks for tutorial
So CooOOL ✨👍
Do you have a Rumble channel???
I wish I saw this video first. I would have spared buying the dc to dc converter some time ago.
how Much current it can deliver with 19v , ?