Turn any fixed voltage adapter to variable voltage output (3v - 20v)

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Modify 12V Adapter to Variable Voltage Power Supply
How To Convert Laptop Charger To Variable Power Supply
Turm mobile charger to variable output
Turn your old 12V charger into adjustable 3V to 20V power supply
12V SMPS to Variable Lab Bench Power Supply
Turns any fixed voltage adapter into variable voltage output in the presence of a 431
Adjustable variable power supply
smps to variable output
smps variable power supply
how to make variable power supply using smps
variable smps power supply circuit
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Components :
10k ohm potentiometer x1
DC voltmeter x1
35v 1000uf capacitor x2
35v 47uf capacitor
#diy #variablepowersupply #howto

[@JukaVKcro]

Thank you for help. I have some battery charger with slightly high voltage. Found 431 and did the job.

[@Elarpachuau]

If you use TL431 it output current is very low. The output voltage can be set to any value between 2.5 and 36 V with two external resistors. The TL431 and TL432 operate with a wide current range from 1 to 100 mA with a typical dynamic impedance of 0.22

[@TricksOfAli]

Thanks, but tl431 corrects the feedback voltage in this circuit!

[@imnotbeluga007]

Yeah, all the TL431 does is to provide a feedback signal for the switching components. If you want to go below 3V, you would need a separate op-amp circuit. And if you're above the rated voltage, expect worse performance because every transformer, be it a ferrite transformer or heavy iron core transformer, drops voltage under load, meaning you can get higher than rated, but unstable, noisy voltage.
In theory, current control isn't hard to make, either. Just a simple op-amp circuit that forces the feedback optocoupler on when either voltage or current is higher than needed.

[@FixitEasyDIY]

Very good 💯

[@TricksOfAli]

tanx🙏

[@f1xzor]

Cool :D I thought it would be more complicated.

[@fayaz125]

Thankyou.. Very useful video.. For Technacian...

[@user-eb3ir5pe7r]

Thank you very interesting video. But the connection of the 3 potentiometer wires is not clear on the electronic card. Please specify this connection in particular where are the extreme wires of the potentiometer connected? Thank you very much for answering my question bécasse i will make an adapter like this.

[@frank88ster]

If the led is not showing anything, does it means it's damaged?

[@handymanssecrets]

good job

[@TricksOfAli]

🙏

[@roshanjayasinghe4505]

Can use as phone charger

[@sokdolla]

can i follow this to modify my 24v Adapter to adjust 3v to 30v?

[@TricksOfAli]

yes you can It is applicable to all power supplies controlled by TL431

[@sokdolla]

@@TricksOfAli if we adjust voltage is it useful for charge battery?

[@TricksOfAli]

@@sokdolla Yes, just put a diode with a suitable amp in the output

[@sokdolla]

what number of diode you recommend?@@TricksOfAli

[@sokdolla]

and can we use 35v 1000uF for those 3 capacitor?@@TricksOfAli

[@cyberbeast1789]

is it safe to run 12v dc fan on 15 or 16 v power supply?

[@TricksOfAli]

yes

[@cyberbeast1789]

can this be done on laptop charger also?

[@TricksOfAli]

Yes, if TL431 is used in the laptop charger

[@katinukanalas]

​@@TricksOfAlimine doesnt have it

[@stephengiacobozzi7785]

you use 470 uf in video you say 2 x 1000 uf

[@Wishme85]

Assalam u Aleyikum.
I have an 18.5 v laptop charger. I have remove its two resistance connected to REFERENCE PIN of TL 431 and attached a 10k Potentiometer . Didn't change any capacitor. Now charger showing 21.5 volts. If u have any whatsapp number, so i can send you the pics of project. It'll be an honour for me if you'll help me.
Thank dear.