Drone Synth - Layout and schematic update over the hand drawn one from earlier, based on LMNC oscillator w/filter. Curios what other ideas to add to this, I have seen capacitor switching
Echo Schematic | Synthrotek
Schematic for 40106 Dual Drone with LDR and LPF : r/synthdiy
LDR Synth with Drones v1.0 - EasyEDA
Granular Synth – Arduino uno | skunkworks systems
electro-music.com :: View topic - first mini drone synth