The 74HC14 is a "Hex Schmitt Trigger Inverter," meaning it contains six independent gates that "invert" their input with added hysteresis.
f≈1.2R×Cf is approximately equal to the fraction with numerator 1.2 and denominator cap R cross cap C end-fraction 74hc14 oscillator calculator full
The frequency of a relaxation oscillator built with a 74HC14 Schmitt trigger is generally determined by the time it takes to charge and discharge a capacitor through a feedback resistor. Standard Approximation Accurate Period Formula The 74HC14 is a "Hex Schmitt Trigger Inverter,"
: For a 5V supply, many designers use the rule of thumb as a starting point. How the Oscillator Works 74hc14 oscillator calculator full
74hc14 relaxation oscillator - NI Forums - National Instruments