i call it the ultimate power supply

[Eslam]

hello guys
my name is eslam and i've done a small project i call it the ultimate power supply

my power supply has an arduino avr328 chip inside to control the whole thing
and i control the variable voltage and current through dc-dc converter

the main power source is 2 18v 3amps connected in parallel

features
max current limit cut off
min drop voltage cut off
battery charger
buzzer alarm
dot matrix 1602 screen


it's an open source project and i think some people here maybe interested to improve it 

here is the project video including the schematic and the PCB

[Ysjoelfir]

Since I don't have the best network connection right now I would be happy if you could share the schematic and layout in an universal form like PDF as I can't take a look at the video. Thanks!

[Eslam]

sure
here is the link to schematic and board
https://drive.google.com/drive/folders/13B2LDXFtgfuueqFDiM3VOX6_jLHPJZoM?usp=sharing

and i will export pdf in same folder today

[Eslam]

check out the pdf schematic and gerber files guys
i attached them here 

https://drive.google.com/drive/folders/13B2LDXFtgfuueqFDiM3VOX6_jLHPJZoM?usp=sharing

[Mechatrommer]

what type of dc-dc converter you use and how you control V and I to it?

[Eslam]

you can choose any stepdown dc-dc converter with adjustable current
don't forget to choose in range of your own power  supply and just edit the max limit in code

[T3sl4co1l]

Yikes, that's the biggest, ugliest, messiest, most unreadable schematic I've ever seen.  I can't make heads or
tails of it.  It looks like something a genetic algorithm evolved, yet (mostly?) manages to avoid basic electrical errors?  I don't even know how this is made... I'm impressed.

Tim

[Mechatrommer]

What i know is the fan's transistor is running in linear mode. According to him current is controlled in dcdc module not shown hence i dont know what the opamps are doing down there sensing low side (i guess)  shunt and outputs connecting each other. And there are unknown /redundant?  Inductors everywhere which is a cryptic mystery...