Originally Posted by amb As for voltage handling, yes, the OPA551 can handle lots of it, but even before that, the pair of 2N3904/3906 serves as a voltage regulator so the OPA551 never even sees any more than +/-12V.
Not to mention the 24V zener which also serves as part of the voltage regulation and limiting circuit. I believe that Amb had stated in his initial posts for the design that it could handle up to +/- 30Vdc, or 60 Vdc cumulative, but that if you were powering at +/- 18V or more to put TO92 heatsinks on Q1/Q2.
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Originally Posted by amb Pars, if you use a OPA551 you'll find that the problem you encounter to essentially disappear. The TL071 does not have low-enough an output impedance to serve as an effective virtual ground splitter that is being asked to sink many tens of milliamperes without some voltage shift.
Yes I did note that it was inadequate for this duty in my post and what I saw was not unexpected.
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