The circuit`s frequency oscillation is /=2.8/ [Cix(/i + i2)]Â· Using the values shown, the output frequency can be varie
d from 60 Hz to 20 kHz by rotating potentiometer R2. A portion of ICl"s output voltage is fed to its noninverting input at pin 3. The voltage serves as a reference for capacitor CI, which is connected to the noninverting input at pin 2 of the IC. That capacitor continually charges and discharges around the reference voltage, and the result is a square-wave output. Capacitor C2 decouples the output.