You can use this circuit as part of more complex ones. A schematic diagram of Gated Oscillator II is given in Fig. 1.
Gated Oscillator II
IC1 4093 CMOS integrated circuit
C 50 pF to 1,000 µF capacitor
R 2,000 to 4,700,000 ohm resistor
Note: The frequency is given by R and C. See other articles about the 4093 IC in the site to determine these components values.