Modify SMPS output voltage 12 Volt to 3 -30 Volt
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- Опубліковано 17 вер 2024
- Modify SMPS output voltage 12 Volt to 3-30 Volt
I need a smps charger which can charge my battery from 5 volt to 24 volt, which is adjustable. For this I am using my old CCTV 12 volt 10A power supply, and modified it upto 30 volt from 3 Volt. The Modification is very simple, you just need to replace feedback resistor (in my power supply it is 5.1 K ,& 1K , I replace it to 2K and 100K) . Next you need to replace the 16V capacitors to 35 V.
For a 12 Volt supply do the same. Watch the video carefully . Remember High voltage is Dangerous.
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Clear demonstration. Good
What a modification...
good👍👍👍👌
Great video, I subscribed to your channel, I've been trying to modify my SMPS 12V 20a, but below 9V it's disarming, and if I climb it above 20V it also gets disarming, can you fix this? I changed the resistor and the potential, error continues...
This trick are working 24 volt 6.5 amp Smps power supply??
Hi, very interesting, well done! I have a 12V/30A SMPS with the 1.5K resistor to replace and the 1K trimmer. To obtain the same result, how many Kohms do I have to replace the resistor and trimmer? Thank you.
Please use the resistor calculation formula, given in video, please watch without skipping
Merci pour la vidéo .I have an LRS-350-24. how can I modify it. Currently with the potentiometer it varies from 19.5 volts DC to 24 volts DC. I would like to be able to vary from 5 volts DC to 24 DC.
5 to 24 volt not possible by changing the resistor on voltage divider part, this may damage your smps, please use any buck converter
My circuit never shown 5.1k coupling to the v/r and it was only 1.7k so which value most suitable ?
Please identify R1 and R2 , 1.7k may be one of them.
There is another video regarding this. You can watch this ua-cam.com/video/DI_lKaD2JWg/v-deo.html
Please can you provide the Schematic diagram for the power supply so I design one on my own.
On MW LRS150 12V supply. I want regulation betwin 12 and 4V. Can I put in parallel of the original trim (8 kOhm) another pot. and wich value?
Good job
where was the 5.1K resistor (R2). It never showed up in your circuit. There were 22K , 1K and 2K. No identification as to which ones were which resistors.
Thank you for Watching.
Please watch again, it was 5.1k, not 1k, and registor colour code helps you to identify.
@@EtcProjects That is what happens when a person like me is color blind.
in 12v 30amp, I changed the resistance from 2.2k to 2 k ... and capacitor to 25 v 3000uf, and i got voltage of 15 volt max...
but capacitor blows in 10 minutes .....
can i use 50v capacitor ?
I want approx 15 v output !
Yes, but capacitance should high value, please calculate the values of register of your smps first, if the voltage divider ic is TL431 then watch the video carefully to replace the Voltage divider resistance
I have a 24v16amp 400 watt supply can I make it do 3-51v if so what would I have to change? the pot to ?k and output caps to 65v maybe
👍
my power supply is disarming and arming below 9v. R1 = 2k and R2 = 10k. Potentiometer 1k. I put in R1 a resistor of 1k and potentiometer of 100k. the source is arming and disarming below 9v. can you help me ?
No I have no solution 😕
I am also facing this problem , trying to solve this, there will be another video on it.
Hi, nice project, I did the same thing. But the 12v 55w bulb does not light up, the amperage has disappeared.
Wattage of SMPS?
@@EtcProjects 120w
Is the SMPS 24 volt or above?
@@EtcProjects I switch from 12volt to 24volt, the result is the same.
Hello Sir. Nice video. I did the same as you showed : incresed the pot from 1k to 10k and the fixed resistor from 1.5k to 500 ohm but i only reach 21v. Any idea why ? Thanks.
R 1 and R2 value change the voltage so properly calculate the value of R1 and R2 for required voltage.
@@EtcProjects hello and thank you for your response. I just want to reach 28v, any idea on how to do this ?
V(out)= 2.5×(1+R¹/R²)
2.5 reference voltage for TL431
Now please calculate R1 and R2
I don't know your circuit, otherwise I will try
@@EtcProjects Thank you, i will try this. I have a circuit based on a tl 494 without the tl431. Do you think the formula is still the same ?
If TL494 is an adjustable zener, then the formula will be same but reference voltage may be change, please check the datasheet for details. I have no idea.
24v 10amp smps power supply ki out put 19.5 to 29.9 volt . Kya ushe 5v to 29.9 bna skte hai ? Kaise ?
You can use 1. buck-boost converter 2 or by changing the feedback circuit . You can find it near TL431
@@EtcProjects SMPS me modified nahi ho sakta ?
Yes, you can modify output voltage by changing feedback circuit, maximum feedback circuit consists TL431
Sr. I request ho ske to ek vedio baye
OK I shall try . You may watch this
ua-cam.com/video/DI_lKaD2JWg/v-deo.html
I did as per your calculations but when voltage reaches to 6 volt output fluctuates.
Below 6 volt it fluctuates
This also happens to me, mainly in lower voltage, trying to solve this problem
@@EtcProjects ok
@@EtcProjectscomo lo solucionaste?
Please tell me in English
How to make variable voltage in 12v 2 amp
By changing the feedback resistor, there will be next video on it.
@@EtcProjects ok
Waiting for your video
Sir that's is safe for PSU no anything problem in other parts after modified?
Depending on your load and mode of use, this is just for rarely used devices
Thanks for the video. I bought the cheapest one from Amazon and it supports to 36v-40v. Could I change its components with reliable ones? And could I modify its exit voltage pot with good one and add a voltmeter/ amp meter?
Yes, you can add voltmeter, you can also modify its output voltage.
@@EtcProjects Could you make a video for this? 😊
@@tcirit uploaded a new video . You may watch
ua-cam.com/video/DI_lKaD2JWg/v-deo.html
@@tcirit uploaded a new video . You may watch
ua-cam.com/video/DI_lKaD2JWg/v-deo.html
@@EtcProjects Great 👍 thanks
buenas mi hermano como estas bien, yo tengo esta fuente y me gustaría también subir él voltaje al masimo también como la tuya ,esta es la fuente, como modificar el voltaje de la fuente .s-120-12 puedes ayudarme porfa te agradezco
Please write in english
If we modify it in your way then will it decrease amp ?
Yes, with decreasing volt amp will decrease automatically
The power is given by the transformer and the power transistors. The modification in this video is to vary the voltage only. The formulas are as follows:
Power(Watts)= Voltage(Volts)*Current(Ampers)
Votage(Volts)= Current(Ampers)*Resistance(Ohms)
You can find the current by yourself substituting the power of your SMPS and the voltage you will use.
No, ampere is changed only when you change the ferrite core transformer
Yes
Please add Farsi to the languages, thank you
if not tl 431 on the mainboard what can i do?
There must be a fixed value zener, you have to replace it by tl 431.
@@EtcProjects how is make connect reference pin?
I shall try to show it in another video.
What will happen to the Amps ?
It is 120 watt smps, so depending on load the amps may change
@@EtcProjects thank you
@@EtcProjects is there’s any way to adjust the Amps
Yes, you can add a buck converter with any smps output as per your requirement
Untuk smps 24v bisa di modif jadi 36v atau lebih tidak om.
plese can i modify it to output 3000 v pulse not dc or dc no problem please
No, it not possible
Sir I'll used 50k potentiometer it's ok for PSU?
Calculate it using the formula
do you have telegram sir, i want to send picture of my power supply, i want to modify it too but i cannot find 5K resistor
Yes, I am in telegram, please find the voltage divider part
can you send me the link
can you show me where is R1 and R2 on your board? does 104 you replace is R2?
No, resistor attach with TL 431 find, it places different position in different circuit board
how many resistor that attack with 431 and we remove that after replace with variables resistor?
Can u change amps
No, you have to change the rewind the coil of fertite core transformer
is it stable if we put load ?
Yes, it is only 120 watt smps. So load should not exceed this limit.
hello bro.. i did the same everything work fine but when i put load my supply buzzing whats goin on ?
Try to maintain the load within the power capacity of smps , buzzing due to transformer.
Brother mere smps m smd component laga h circuit samaj nhi aarha h voltage divider kaa aap whatsapp contact krr skte h kya?
I suggest you not to desolder the smd components, use DC DC boost or buck converter .
@@EtcProjects space issue h