Why are you using an LM386, which is designed to drive an 8Ω load with a 100KΩ resistor in it's output? It may work but it's a funny way of doing things.
Using a 7805 1 Amp regulator when there is zero load current is also a bit weird.
Your 'C' calculation is also highly suspect. You seem to be adding the values of capacitors in series.
The circuit will only operate over a limited load at 'RF out' and the load will influence the frequency.
If the BC549 circuit is supposed to be an output monitor, it isn't wired optimally and the LED is backwards.
Apart from all that, it's fine :|
Brian.