Yeah but then I'd have to use trimmers to adjust them to 12v.. I may see if I can leave them on the board and supply them from the bipolar 18 daughter board before I throw the 12v regulators at it. The 337/317 and trimmers part of the circuit is all on the layout so it may be just that ... easy
I have regulators for days so worst case is I'm adding another little daughter board with the 12V regulators. Thanks for rapping with me about it.
Edit: So I've been looking into this more, and I think supplying 18+ and - to the "In" pin of the 317 and 337 respectively, removing the diodes going to the "12VAC IN" row, and then using the ground row as my common ground for the bipolar supply and board, I would be able to dial in the 12V + and - where I need. Now for the big question. I think a 1054 or 1044/7660 can produce a max current of 200 ma or less at 5V no load. I am not sure that's going to be enough to power 6 big chips. In fact it probably wont be.
Thoughts?
I might be right back to using an AC power supply to get enough current for the hungry chips (Which is probably why Schumann used it in the first place?) There's a dude who sells clones out of Italy or something on Reverb and it looks to me like his use a 9V power supply..
https://reverb.com/item/3497660-ftelett ... k-aluminumclearly states 9V power supply.. I guess It's time to hit the data sheets and add up what those 6 chips are pulling down