Just looking into some full wave rectification without diodes and I have so far found 2 ways. One with 2 op amps, quite costly, or one promising one with just a transistor:
I do like the look of this, might be right up my street. It does look slightly jubious, but its worth a try. If not, I might have to settle for the opamp rectifier.
Also found this, another opamp full wave rectifier but with the possibility of only 1 op amp. Even if it doesnt, it still uses less parts than the first.
Found one last one, much like the prebvious, but has some programmable gain on it.
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