Rick Jansen's oscillators http://www.sara.nl/Rick.Jansen/Emusic/VCO/VCO.html are based on the CA3046, but he doesn't connect the famous pin 13 to -V ? Maybe one can change the heater and temperature sensor reference to -V... Regards, Thierry Rochebois http://www.ief.u-psud.fr/~thierry/welcome.html