Sine wave oscillator

 

This scheme is sine wave oscillator, with frequency from 5 Hertz up to 5 KHZ. Capasitor C1, C2, C3 altogether valuable 100pF, yielded frequency 5 KHZ. To get other frequency magnitude of we ready to change value at C1, C2 and C3, like under this.  
C1, C2, C3 = 0,1uF      = 5 Hz      
C1, C2, C3 = 0,01uF    = 50 Hz
C1, C2, C3 = 0,001uF   = 500 Hz