I am trying to design a Twin T oscillator. The Twin T network was connected between the inverting i/p and the output of an op-amp, and the non-inverting input was grounded. I looked up this design over the net, but this doesnt seem to oscillate. However, when a feedback resistor is connected between the output and non-inv input, it started to oscillate. Could somebody please explain the working ?
Also, I expected that the frequency of oscillation be a function of the resistor and capacitor in the Twin T circuit. However, even a variation in the positive feedback resistor seems to vary the frequency, which is not what I want. Can somebody suggest certain steps to overcome this problem.
Thanks
Also, I expected that the frequency of oscillation be a function of the resistor and capacitor in the Twin T circuit. However, even a variation in the positive feedback resistor seems to vary the frequency, which is not what I want. Can somebody suggest certain steps to overcome this problem.
Thanks