Modifying smps to a Variable power supply (4.5 to 14V) 

I don't think it is possible. Out put capacitor maximum rating is 16v.

Diode Gone Wild did a video recently where he increased the voltage to double. You change the capacitors on the secondary side to higher voltage ones. Then change the resistor in the feedback circuit.

Can get 15v ????

I will try that in future.

@@shadiabuaalim8190 add higher voltage capacitor in output side and chamge Tl431 feedback pin 📍 voltage devider resistance. One resistance connected between positive supply and pin one of Tl431 and another with pin one to ground via 1k preset.for Increasing voltage remove preset and short it with ground and remove resistance positive to pin one and add higher value preset.

Thanks for watching!

Thanks for your support.

If the transformer is 24v you can do, replace the electrolitic caps for another same capacity but 35v and the 1k pot for another 100k, thats all. If the caps are 35v then just replace 1k pot for 100k pot.

I don't say you can't. but first check which topology is used. depending on the topology you have to sure about few things. and also transformer can store a specific amount of energy. your out voltage is not stable may be because your transformer is going towards saturation and controller ic will not allowed it to happen. if you want to change transformer windings first check what are the limitations based on topology.

Aumenta o capacitor acima de 36, coloca 50v

Email me with pictures ojyx09@gmail.com

Yes. They all do the same job.

@@tarunhazra8481Thanks Sir, 10k type or other? www.aliexpress.com/item/-/1005001551496577.html

you have a power adapter which gives 18v right? Try to find feedback pin. Usually a voltage divider is used to set SMPS's output voltage. Replace that voltage divider with a potentiometer.

@Shadi Abuaalim add higher voltage capacitor in output side and chamge Tl431 feedback pin 📍 voltage devider resistance. One resistance connected between positive supply and pin one of Tl431 and another with pin one to ground via 1k preset.for Increasing voltage remove preset and short it with ground and remove resistance positive to pin one and add higher value preset.