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

Опубликовано:

3 окт 2024

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Комментарии : 40

@JukaVKcro 22 дня назад

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

@fayaz125 Год назад

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

@FixitEasyDIY 11 месяцев назад

Very good 💯

@TricksOfAli 11 месяцев назад

tanx🙏

@Elarpachuau 8 месяцев назад

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 8 месяцев назад

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

@imnotbeluga007 6 месяцев назад

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.

@frank88ster 3 месяца назад

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

@عمارةحامدي-ذ7غ Год назад

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.

@f1xzor 7 месяцев назад

Cool :D I thought it would be more complicated.

@handymanssecrets Год назад

good job

@TricksOfAli Год назад

🙏

@roshanjayasinghe4505 Год назад

Can use as phone charger

@sokdolla 9 месяцев назад

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

@TricksOfAli 9 месяцев назад

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

@sokdolla 9 месяцев назад

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

@TricksOfAli 9 месяцев назад

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

@sokdolla 9 месяцев назад

what number of diode you recommend?@@TricksOfAli

@sokdolla 9 месяцев назад

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

@cyberbeast1789 11 месяцев назад

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

@TricksOfAli 11 месяцев назад

yes

@cyberbeast1789 11 месяцев назад

can this be done on laptop charger also?

@TricksOfAli 11 месяцев назад

Yes, if TL431 is used in the laptop charger

@katinukanalas 11 месяцев назад

@@TricksOfAlimine doesnt have it

@stephengiacobozzi7785 5 месяцев назад

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

@Wishme85 Год назад

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.