He lineup,
what a worthwhile advice
It *is* build in reality, and not working in sim (anyway, better than the other way round). I did so to check what happens to happen both in sim and reality if I change something.
The sim works now, I replaced *all* opamps with their dedicated models. It seems you can't mix both universal and specific models, of course, I don't know if this is true in all cases.
Rüdiger
Edit: Wrong! It seems to work only randomly. If I change anything (e.g. add a parallel cap to Rf), then I get the error warning again
what a worthwhile advice
It *is* build in reality, and not working in sim (anyway, better than the other way round). I did so to check what happens to happen both in sim and reality if I change something.
The sim works now, I replaced *all* opamps with their dedicated models. It seems you can't mix both universal and specific models, of course, I don't know if this is true in all cases.
Rüdiger
Edit: Wrong! It seems to work only randomly. If I change anything (e.g. add a parallel cap to Rf), then I get the error warning again
Hi,
That's a common Spice engine error and opamp simulations are the worst offenders. Can mean a myriad of things from too complex of a circuit or signal to not enough info to make the calculations.
I've found that sometimes the silliest things can cure it - like varying a resistor by one ohm (99.999K instead of 100K on a feedback resistor for example) and other times it plain won't run.
Can you try another, more co-operative opamp model with similar charcteristics (like a TL072 for an 082)? The real-life difference won't be significant.
Cheers!
That's a common Spice engine error and opamp simulations are the worst offenders. Can mean a myriad of things from too complex of a circuit or signal to not enough info to make the calculations.
I've found that sometimes the silliest things can cure it - like varying a resistor by one ohm (99.999K instead of 100K on a feedback resistor for example) and other times it plain won't run.
Can you try another, more co-operative opamp model with similar charcteristics (like a TL072 for an 082)? The real-life difference won't be significant.
Cheers!
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