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Feedback on power supply 0-30V 0-4A
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xavier60:

--- Quote from: d4n13l on July 31, 2019, 07:33:27 am ---As I understand it, the negative feedback loop provides a path for the output of the op amp to regulate the inverting pin. In the schematic U1G2 can do the same by controlling U2.

I think you're right about the meter, I tried the 5V regulator as xavier60 suggested and it messes with the regulation, guess I'll have yet another small transformer.

---

David,

for the offset you mean something like the trimmer (R11) I had in the first schematic?

--- End quote ---
Do you have a diagram showing how the 5V regulator and meter were wired?
GigaJoe:
will charge pump 7660 work here, instead a second transformer and all around ?
ggchab:
It's even possible to obtain the negative supply from the main transformer and use a voltage regulator (like a 79L05) if consumption is not too high.
d4n13l:
Thanks on the tips... I'll try them out, so... I tested everything on the protoboard and worked great.. then tried it once soldered to a stripboard, the results were not that good.. I guess it's expected from my first project u.u

maybe someone can give me some tips, like do you tested the circuit each time you solder a component? also something I hadn't considered, how much current do these boards can handle?I don't know if it should have an external cable to handle the current or simething like that..
GigaJoe:
not good, means, not a stable output when apply a load ? Need a symptoms
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