Hello T.T.Discovers You made a nice video. Thank you.I will be waiting for your videos to continue.I'm going to ask you a question. How much ohm is the value of the trimpot (VR) you have removed ? Are the values of the new trimpot and the trimpot you removed from the card different?I am using Google translation. I apologize in advance for the incorrect translation.
It can be done. Just remove the old TL431 feedback circuit entirely. We'll be replicating its behavior to take control over the power supply. Use a op-amp circuit to amplify and compare current (shunt voltage drops) with the set value. If the current exceeds the set threshold it forwards an "overvoltage" signal, decreasing the voltage and thus current. Once one of the values drops low enough, the circuit assumes there is undervoltage, so it brings the voltage and current back up. Both values can be regulated like this, with the current control having priority. This happens over 60,000 times a second, resulting in precise regulation.
That potentiometer had a small voltage range used for fine tuning from 18 to 27V on a 24V supply, for example. We want the largest range possible, so we connect straight to the voltage feedback circuit. This allows us to regulate down to 3V. But if that potentiometer ever disconnects.. congratulations, you damaged your power supply as there's no voltage feedback anymore, which makes the control circuit think there is low voltage, increasing the pulse width and output voltage which it doesn't detect and this continues until the output capacitors blow up from overvoltage.
so, basically i want to try his steps. found SMPS, check found 10 pot, check found out capacitors still hold huge charge after unplugging mains, found new firecrackers (BIG CHECK) ----never been so happy in my life
How you made it variable ? Itself its already variable...fake video you just change trimpot to potentiometer only.. You can also adjust by tripot also Whats new you did ????
The older one could just provide a range of 9-14 volts The higher range of the R value the wider voltage range you will get. Yet, i believe it will not be as accurate as the old one
no es que lo hizo variable, es simplemente que cambio el rango de variación. igual si superas el rango de voltaje original de la fuente por mucho se vuelve inestable y cae el amperaje si la quieres fija cambias el variador por una resistencia fija en el valor especificado por la variable y listo. y si es fija de fabrica haces lo opuesto solo debes saber cual es la resistencia la cambias por un variador y ya. en cuestión de fuentes nada es fijo o variable si se tiene el conocimiento para hacerlo.
Super super super super idea. .. 👍👍👍💯💯💯💯🔥
Every person is doing your way is very good 😊 and your testing with load which
What is the final output amplifier
Kharab nahi hooga na asi karnese?
Hello! How to adjust the current?
Smps amph please?
Hello T.T.Discovers
You made a nice video. Thank you.I will be waiting for your videos to continue.I'm going to ask you a question. How much ohm is the value of the trimpot (VR) you have removed ? Are the values of the new trimpot and the trimpot you removed from the card different?I am using Google translation. I apologize in advance for the incorrect translation.
20K
@@t.t.discovers9570 that actually depends on the power supply
i have the 12 volt 40 amp switchers and the value thats in it stock is a 1k variable.
I understand, can you make this PSU deliver 0-60v ?? What is the max Amperage ???
What is the value of potentiometer you replaced and the ampere of smps .
And how to make variable amp and voltage with smps please make a video
10k
Can you modify to adjustable current?
🙃it can be done , but do you think he can !
It can be done. Just remove the old TL431 feedback circuit entirely. We'll be replicating its behavior to take control over the power supply.
Use a op-amp circuit to amplify and compare current (shunt voltage drops) with the set value.
If the current exceeds the set threshold it forwards an "overvoltage" signal, decreasing the voltage and thus current.
Once one of the values drops low enough, the circuit assumes there is undervoltage, so it brings the voltage and current back up.
Both values can be regulated like this, with the current control having priority. This happens over 60,000 times a second, resulting in precise regulation.
why did you remove the internal pot , you could just use it !
That potentiometer had a small voltage range used for fine tuning from 18 to 27V on a 24V supply, for example.
We want the largest range possible, so we connect straight to the voltage feedback circuit. This allows us to regulate down to 3V. But if that potentiometer ever disconnects.. congratulations, you damaged your power supply as there's no voltage feedback anymore, which makes the control circuit think there is low voltage, increasing the pulse width and output voltage which it doesn't detect and this continues until the output capacitors blow up from overvoltage.
is it ok to use 50k potentiometer?
Where u get a 50k
so, basically i want to try his steps.
found SMPS, check
found 10 pot, check
found out capacitors still hold huge charge after unplugging mains,
found new firecrackers (BIG CHECK)
----never been so happy in my life
Pax pax as my wife say
You just replaced the existing Variable Resistor . It was already adjustable 😒
Yes but the orig pot on the board limited only at 10v to 14.6v
@@smoke_stackz3168 So value of trim should be less than 10k of the new pot.
How you made it variable ? Itself its already variable...fake video you just change trimpot to potentiometer only..
You can also adjust by tripot also
Whats new you did ????
The older one could just provide a range of 9-14 volts
The higher range of the R value the wider voltage range you will get. Yet, i believe it will not be as accurate as the old one
no es que lo hizo variable, es simplemente que cambio el rango de variación. igual si superas el rango de voltaje original de la fuente por mucho se vuelve inestable y cae el amperaje si la quieres fija cambias el variador por una resistencia fija en el valor especificado por la variable y listo. y si es fija de fabrica haces lo opuesto solo debes saber cual es la resistencia la cambias por un variador y ya.
en cuestión de fuentes nada es fijo o variable si se tiene el conocimiento para hacerlo.
No proper way to connect which pin to potentiometer useless
Falso video falso
fake : this pot changes only around the 12 V plus or minus
yes. he just put extention to the trimpot. lol2