f ≈ 1 / (2.2 × R × C)
When selecting components for your 74HC14 oscillator, keep the following guidelines in mind:
If you are using an online tool or building a spreadsheet, here is how the inputs and outputs interact. 74hc14 oscillator calculator
This article provides a comprehensive guide to understanding, calculating, and optimizing the 74HC14 oscillator circuit.
Connected from the input (pin 1) to Ground (GND). f ≈ 1 / (2
Duty cycle D (fraction of period output is high) depends on whether output is high during charging or discharging. For the common inverter wiring where output is high while capacitor charges toward VCC, duty cycle (output high time / period) = t_charge / T.
$$ f = \frac1RC \cdot \ln\left( \fracV_CC - V_T-V_CC - V_T+ \right) $$ Duty cycle D (fraction of period output is
f≈10.8×R×Cf is approximately equal to the fraction with numerator 1 and denominator 0.8 cross cap R cross cap C end-fraction For a time-period ( ) calculation: