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this post was submitted on 28 Aug 2023
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Was checking the schematic, nice notes! I would have sprung for a regulated -9V using a dedicated switched cap doubler chip (they're cheap, 1x of these to invert, 1x to double) and a LDO follower.
But no turbo encabulator? That's quite a bold design choice.
It would save on a lot of the discrete components used, I am not a fan of running open-loop voltage supplies.