DIY a tiny variable power supply

This video shows you how to recycle a laptop power adapter to DIY a variable power supply. The power supply can easily supply electrical appliances with different working voltages, such as driving small motors and charging batteries.
We need the following things:
1. A laptop power adapter, we also can recycle the old laptop’s power adapter so we do n’t have to buy a transformer;
2. A voltage ammeter, which can display the output voltage and current at the same time;
3. A DC to DC adjustable step-down power supply board;
4. two Banana Jack Sockets;
5. A Female Power Jack Socket;
6. A Resistance Potentiometer;
7. A transparent plastic box, we can recycle one from plastic packaging boxes so you don't have to buy it.
The total cost is only $14, So very cheap and environmentally friendly.
Thank you for watching it. Welcome to subscribe to my channel for more videos.
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/ @diyqiqi

[@femihasani1988]

Here did you get the box, very Nice one.

[@DIYQiQi]

Thank you

[@omkarkhade4602]

Nice tutorial 👍
Well presented : )

[@DIYQiQi]

Thank you! More videos are coming soon :)

[@gunnerriley137]

You probably dont care but does anyone know a tool to get back into an Instagram account..?
I was dumb forgot the password. I appreciate any help you can offer me.

[@brycenandre7488]

@Gunner Riley instablaster ;)

[@gunnerriley137]

@Brycen Andre I really appreciate your reply. I found the site through google and Im waiting for the hacking stuff now.
Takes a while so I will reply here later with my results.

[@gunnerriley137]

@Brycen Andre it worked and I actually got access to my account again. I am so happy!
Thank you so much, you really help me out !

[@bobBob-hu6ij]

are you sure is this not fake ? i try it with your way but does not work at all plz tell me

[@DIYQiQi]

What’s wrong with your power supply ？

[@RobiB.]

What formula did you use to get 50k ohms of potentiometer

[@troyguererro0898]

You can't adjust the current right?

[@DIYQiQi]

Yes, it can only adjust the voltage.

[@johnmacedo4483]

The XL4005 is limited to only one potentiometer. If you want to adjust both voltage and current. Simply replace the XL4005 module with, for example, the XL4015 buck converter. That way you will be able to use two potentiometers instead one just one.

[@troyguererro0898]

@@johnmacedo4483 yeah, I thought so. That is why I bought a buck converter with current and voltage limiter. Thank you for your suggestion.

[@johnmacedo4483]

@@troyguererro0898 No problem. 👍👍👍👍

[@andyboghi]

how much is potentiometer, 1k, 10k?

[@DIYQiQi]

50k

[@momoAinz]

Where to buy the parts?

[@DIYQiQi]

ebay or digikey

[@troyguererro0898]

BTW can I use a speed controller instead?

[@DIYQiQi]

The voltage waveform output by the speed controller is a PWM wave, which is not suitable for powering non-motor loads : )

[@troyguererro0898]

@@DIYQiQi oohhh I see. Thank you for the knowledge

[@humayerarahman6238]

actually the multimeter voltage is accurate than that cheap voltage meter in your power supply.

[@DIYQiQi]

Of course, multimeter is professional device.

[@Comrade_YG]

No one wants to measure the voltage with a multi meter every time you turn the potentiometer

[@DIYQiQi]

You are right. The voltmeter that comes with the power supply does not need to be very accurate. Using a simple voltmeter is enough.

[@DIYQiQi]

I’m too busy to upload videos 😂, New videos may be uploaded in two or three months.

[@dj_sorra8605]

Diagram bro please

[@Comrade_YG]

Are you stupid she put a diagram at the start of the video