Electronics > Beginners

OpAmp oscillation

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MarkF:
Here is what I did based on a design by Peter Oakes:
0 to 1.5A @ 20V max with internal control or a 0 to 5V external input.





   

exe:
Unfortunately, the most common approach to solve stability issues is to randomly put resistors and caps.

Fortunately, one of forum members designed an electronic load with stability in mind: https://www.eevblog.com/forum/projects/dynamic-electronic-load-project/ . You can follow his design procedures.

PS it can be more tricky than it looks. I spent quite some time to figure out how to stabilize my own circuits. And I ended up empirically increase capacitor in negative feedback (Miller compensation). The downside of this approach is circuit becomes slow. But for battery testing this can be fine.

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