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Old 16th September 2013
  #19
Oli
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Thanks for the great updates. (btw, nice close up photos too)

Would it be possible to put an inductor on the supply to the charge pump, to reduce noise coming back from it to the supply rails? I've done this on a charge pump before, which worked well enough to solve issues in that particular design.

As you're very experienced with synth design, building and also servicing, do you see a lot of 'interesting features' like this? I don't have much experience in audio electronics, but often see aspects of designs which appear strange to me. In this case, it not only looks wrong, but also looks like the kind of thing engineers would normally test for in prototyping.