From electro-music.com wiki

Schematics: 3 Phase LFO Originally By Rene Schmitz

DIY | LFO | Three phase | René Schmitz | Motohiko Takeda | VCA

3 Phase LFO originally by Rene Schmitz ,redrawn and adapted with pcb layout by Motohiko Takeda ,added vca buffers ,page here : http://www.aleph.co.jp/~takeda/radio/homemadesynth.html