Stream Armagedrone analog drone synth by Lefty's Sound Lab | Listen online for free on SoundCloud
King Drone analog drone and noise synth with LP/HP filter | Reverb
Krischer M8, Analog 8 Oscillator Drone Synthesizer Made For Minimalists
Leonard de Leonard — Beatiful and very musical DIY Drone Synth done...
Atari Goth Console - DIY Drone Synth Kit from CCTV on Tindie
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