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DIY Variable power supply

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chiken:
Hello everyone, :)
Having Power supply with variable voltage and current would be quite hand to me as a student so i wouldnt fry things every so often,
and since my attempt to buy cheap Variable Psu has failed, and trying to fix chinese boards failed even more :horse: I decided that it would be best to build it myself.

And since I did not reach that level of education to be able to make schematics that far myself, but am able to understand already made schematics,
Is there any fellow forum colleague who would share  some schematics of PSUs with variable voltage and constant current for educational purposes
I was thinking about 30V and 10A what would maybe be overkill, but that is pinnacle, 5A would be fine, but wouldnt go lower than that, Voltage 20V+...

And if anyone is wondering why would i give that much effort in it and simply not collect some money and buy one for 50$ from amazon, well few reasons why :
1. i like to make things myself  :-/O
2. as a student, budget is stingy..
3. as i said, ive already tried buying one, even though it was lot cheaper, but wouldnt risk buying chinese crap again
4. if i have to choose between buying something for 20$, and buying parts and making it myself for 20$ without thinking would choose 2nd option,
as i said im student and making it myself would vastly help me understand principles of it and maybe one day create one myself

If is there any other place that i could post like this, please let me know.

Critics somewhat allowed, just dont go berserker please hehe

RES:
Low count, discrete standard parts, you can think of a supply like this. (no current control)

chiken:
thank you for your reply,
but i didnt mention that constant current, current control is quite necessary

xavier60:
There are 2 threads currently with working designs.
https://www.eevblog.com/forum/projects/linear-lab-power-supply/msg2272788/#msg2272788
https://www.eevblog.com/forum/beginners/lm324-power-supply-with-variable-voltage-and-current/75/

rstofer:
Read through the linked threads above. You will find that building a lab supply with your requirements is a really big design challenge and many hobby circuits have warts.

Search through this site, Dave did some videos on switching power supplies with nice digital displays that are only $20 or $30.

https://www.eevblog.com/2017/10/11/eevblog-1030-20-diy-bench-power-supply/

Search for others

https://www.eevblog.com/episodes/

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