74hc14 Oscillator Calculator -

: The capacitor now discharges through the same resistor into the LOW output. Lower Threshold ( VT−cap V sub cap T minus end-sub

f≈1.2R×Cf is approximately equal to the fraction with numerator 1.2 and denominator cap R cross cap C end-fraction : Output frequency in Hertz (Hz). : Resistance in Ohms ( Ωcap omega : Capacitance in Farads (F). If you use a resistor and a capacitor: 74hc14 oscillator calculator

[f = \frac12 \cdot R_1 \cdot C_1 \cdot \ln(3)] : The capacitor now discharges through the same

Use (time constant). f ≈ 0.455 / τ because 1/(2.2) = 0.4545. If you use a resistor and a capacitor:

freq_e, period_e = hc14_oscillator(r, c, method="exact") print(f"Exact (5V): freq_e:.2f Hz, Period: period_e*1000:.2f ms")

Let's select a common ceramic capacitor: $C = 100\textnF$ ($0.1\mu\textF$).

Note: with these symmetric threshold ratios the duty cycle is near 50%; in general it will not be exactly 50%.