This is my running circuit and its waveform. I have met the requirements set by my instructor in which Vrms=2.5 and is operating at <100Hz. My only problem is now making a sinusoidal waveform. I have tried a bunch of things like removing the C2 capacitor and adjusting some of the values but still have failed to obtain a clear sinusoidal wave. Need some tips how to achieve it. Thank you very much!