In this circuit, the IC 4047 operates on free-running mode. There are three outputs. A square-wave normal output is delivered through pin 10. Pin 11 is the inverse of pin 10. If pin 10 is high, pin 11 is low. The duty cycle will always be 50%. Output from pin 13 is twice as fast. The oscillation frequency is determined by the 39K resistor and the 1 µ F capacitor.
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