This project is not abandoned
I was a bit overloaded with the mass of info and felt a little demotivated too, so took a break from this one...
Well, there is always something to improve in a circuit, better ways to do it, change a part for better performance, better this and that. But if I don't set and hold on to some boundaries, it's going to be an endless spiral of improvements and the project will never become something real.
I appreciate the efforts and time of everyone who posted something relevant in this thread. Especially those who contributed improved versions of my circuit or provided alternative ones, and actually explained how and why...
I liked the modified version from OM222O as a concept, even though I may not build it as the first prototype, took some ideas thou. Same for circuits from MarkF, Jay_Diddy_B, Yansi ...
Btw. never planned to test transient response etc. Might be nice, if the final circuit was somewhat capable if I learn more about that stuff in future. But for a beginners project, this is currently not considered.
Well, actually any further info and insight about dynamic loads, transients, loop bandwidth, stability, op amp protection, and so on - is obviously welcome ... For future study and also other beginners who might read this
Now here is my next version:
available also at the public project page:
https://easyeda.com/pinoccio/Electronic-Load-DIY-open- my IXYS fets arrived
- swapped op amps for possibly better ones
//both ebay so ...hopefully no knockoffs or faulty rejects - changed sense resistors to 1/3 R and related modification to divider
- 12V supply
- played with the current sensing part...
Tried to design the current sensing summing amp, so that it can still work with single supply... well, not really sure
If this is not a reasonable way to go, other options are:
- proper dual supply
- separate direct sensing of each channel (got the free ADC port)
- dedicated current sense module high/low side -like INA* or similar