): The voltage level at which the input switches from HIGH to LOW. This built-in hysteresis (
). By adjusting the "bucket" size (capacitor) or the "hose" size (resistor), you control exactly how fast that heartbeat pulses. or a list of common RC pairs for specific audio frequencies? #1106 74HC14 Oscillator 74hc14 oscillator calculator
$$ f \approx \frac0.8R \cdot C $$