74hc14 Oscillator Calculator Today

74HC14 Oscillator Calculator

This write-up explains the Schmitt-trigger inverter oscillator using the 74HC14 (hex Schmitt-trigger inverter), gives the formulas for frequency and duty cycle, shows design steps, and provides example calculations and practical notes.

• RC oscillator: A simple oscillator circuit that uses a resistor and capacitor to generate the oscillation.
• Crystal oscillator: A more precise oscillator circuit that uses a crystal to generate the oscillation.
• LC oscillator: An oscillator circuit that uses an inductor and capacitor to generate the oscillation.

Frequency (Hz) = 1 / (2.2 × R × C)

• $V_T+$ (Positive-going threshold): The voltage level at which the input recognizes a logic HIGH.
• $V_T-$ (Negative-going threshold): The voltage level at which the input recognizes a logic LOW.

Fine tuning: Use a fixed C and a trimmer potentiometer for R. 74hc14 oscillator calculator