Is there a method to determine the values for the resistances? below shows when R1=R2 << R2=R3 and the capacitance is 10uF and the circuit works perfectly.
However if I try to reduce the capacitance to say 1nF there is no output, as below,
I have read that the frequency should only be dependent on R2, R3, C1 and C2 and that R1 and R4 are only to limit current through the transistors. So with me reducing the capacitance this should increase the frequency as the resistors are the same values but there is no output. I have experimented and if I increase the values of R2=R3=100k I do get an output at much higher frequency but I don't really understand why I should have to change these values. If anyone could help me understand what is going on that would be awesome.