Quote Originally Posted by mister_e
Is the frequency of 10MHZ may change or you want it fix?
  1. Some Wein bridge Op-Amp circuit are possible.. at 10MHZ.. may work or not, never tried it before.
  2. MAX038 will work... not cheap, do too much things
  3. 10MHZ square wave TTL or CMOS based and integrated twice (or more) with low pass/bandpass/highpass filter using op-amp.
  4. If your project will use a PIC.. why not choosing a 10MHZ Crystal and send the sgnal to a buffer... then send it to those low-pass filter?
Actually why I 'm thinking in that way, because I'm restricted with 9 v battery so you can't use opamp and it's is not simple to design it using transistors (I'm not good in that).

As MR. Darrel Taylor said it's not possible with PIC , then help me with any circuits.