The value of the capacitor and the resistor that drives it in the square-wave oscillator determines the frequency.
the supply voltage and how you filter it determines the amplitude.
The value of the capacitor and the resistor that drives it in the square-wave oscillator determines the frequency.
the supply voltage and how you filter it determines the amplitude.
If the values of R1 and R2 are higher then the output of the opamp will not be overloaded like it is now and the frequency calculation will be more linear with changes in the values of R2 and C2.
the corner frequency (0.707 of the passband amplitude) is at f = 1/(2*pi*r*c)
Pick a frequency a fair bit lower than the sinewave frequency as these filters have low performance. Getting 8V amplitude will be very hard as the RC filters attenuate the signal significantly.
You can do this without adding components if you are allowed to rearrange them. Look up Wein Bridge oscillator. If you are allowed to add one capacitor you can make a phase-shift oscillator.