I have constructed an oscillator circuit using the resistor and capacitor values shown in the diagram above (from the Proteus ISIS simulator).
I run the circuit and use a switch to trigger the oscillator. I get the following waveform.
Using cursors in the oscilloscope I observed the time for each cycle of the waveform was around 7.6 microseconds which was considerably lower than the required frequency.
Could someone tell me why I'm not obtaining the required frequency? I understand that that it will never be exact, but this is a pretty large difference. Also, is there any way to obtain a more sinusoidal output?