A stable single transistor sine wave generator, that works with many values of input voltage. Β In PartSim you can easily change the value of the resistors and capacitors and observe the effect on the frequency of the oscillator. Β If you are manually calculating the frequencies, make things simpler by keeping Β the values of the resistors and capacitors equal (R5=R6=R7 and C1=C2=C3).
For more detail: 2N2222 Phase Shift Oscillator