DIY Build CEM3340 (?) (Noob Question)

[fredrik]

See here for the exponential converter that’s mentioned briefly in the build document:

Help: A Newbie's Drone Synth

The build instructions for that VCO mention an exponential converter but doesn’t explain how to build one. This article (by the same author) has the schematics: (Kristian Blasol of Modular In A Week fame is currently live streaming a build of the AAC version, and I thought the schematics looked suspiciously similar )