Joe Davisson's Obsidian adapted for negative ground

[Fancy Lime]

Hey everyone,

I've been meaning to do this for quite a while. Added a few things like diode protection, RF filtering and power supply filtering.



Also added a few more obvious things like an output buffer and some additional stabilization resistors to keep the noise down. Have not tested this but should work.



Have fun and as always, if you find mistakes, let me know.
Cheers,
Andy