D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.

And this is the more evolved, 154dB@100Hz variant. Some work will be necessary on the two compensation capacitors. Note that not all the protection components have to be present in all situations; depending on the context, some might be dispensed with (and it applies to the two variants), but as drawn they should be reasonably bullet-proof.
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