Schematics / Moog Type Filter
Moog Type Filter by Rick Jansen ,page dedicated to this design is here : http://dropmix.xs4all.nl/rick/Emusic/Moog/ ,from the notes on this VCF :
For the Formant I have made a Moog ladder filter. This circuit is based on the MiniMoog/Prodigy VCF. The exp converter uses the cheap and widely available transistor array LM3046, and is temperature controlled (luxury!). Optionally the temperature control can be omitted: simply leave out R1 and replace D1 by a wire. Power supply required is +15V and -15V.