An excellent low frequency sine signal is produced by this oscillator. The frequency is determined by the elements of the twin-T according the formulas in the figure. The upper limit for this oscillator is about 100 kHz. Other operationals can be used to reach higher frequencies. Power supply can range from 6 + 6 V to 12 + 12 V. The trimpot is used to adjust the symmetry of the signal.
