oscillator with positive feedback

Discussion in 'General Electronics Chat' started by shreyas_bhat, Sep 28, 2005.

  1. shreyas_bhat

    Thread Starter Active Member

    Jul 26, 2004
    Hello all

    I have attached a schematic of the Twin T oscillator circuit I'm working on.

    When no positive feedback is given, the ckt. seems to corroborate with the oscillation frequency formula given by f = 1 / (2pi RC). This was simulated in Pspice.

    Upon giving an addtional positive feedback to the same ckt. the frequency changes. From one of my earlier posts, i got a response saying it was because of saturation being reached upon addition of positive feedback. Is there a way to still calculate the resulting frequency for the different values of resistors in the positive feedback?

    Please comment.