This a followup to
https://www.eevblog.com/forum/beginners/diy-0-30v-0-3a-again/ It seems that project was not completed successfully.
I am attaching from that thread what I believe is the final design.
Is that considered to be the correct and final design and confirmed to work correctly?
If so, is it possible to buy the PCB?
In this thread I would like to come to a final, confirmed working, design, including specs, schematic, list of parts and PCB design.
I am analyzing it. I see the op-amp on the right does the voltage regulation and it looks quite simple and straightforward.
The op-amp and 5.6 volt zener in the center provide the voltage reference. I think it would be quite possible to simplify that and get rid of the op-amp and provide a simpler voltage reference. It might not be so exactly precise but I think it would be more than enough for most applications.
The op-amp on the left does the current limitation control and Q3 lights the LED when current limit is active.
I do not see why the 10V zener that lowers the supply voltage to U3 is needed. Maybe it can be omitted?
Maybe I would add an "ON" LED, just to show voltage at the main capacitor.