> > It's Terry's 1973 Electronotes VCO. Still the best VCO I've seen thanks all for clarification... How about already mentioned 4007 for switching instead FET ? Don't have data sheet handy ,I belive it's not perfect (gate cap,parasite diodes etc.) but you can run 3 vcos from the same chip.I saw it at tomg's site and somewhere else. marjan