to find exact threshold voltages for your specific supply voltage.
The 74HC14 operates between 2V and 6V. The switching thresholds change slightly with voltage, affecting the constant k. At 5V, k ≈ 1.0. 4. Frequency Limitations 74hc14 oscillator calculator full
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This oscillator is not perfectly symmetrical (50% duty cycle). affecting the constant k. At 5V
Avoid calculators that simply print ( f = 0.72/RC ) without explaining their assumptions.