Self-oscillating State Variable Filter

Discussion in 'The Projects Forum' started by osterchrisi, May 9, 2011.

  1. osterchrisi

    Thread Starter New Member

    May 9, 2011

    This is my first post here, so hello to everyone! :)

    I'm building a voltage controlled state variable filter with vactrols and so far everything works out perfect. Nevertheless there's one wish my circuit doesn't fulfill me yet: self-oscillation. It oscillates at high audio frequencies but the lower I take the cutoff frequency the more the oscillation vanishes until a certain point, where it stops completely.

    Is there any trick to get a SVF to self-oscillate 'better'?
    Thanks a lot for any suggestions!!