74hc14 Oscillator Calculator Full May 2026

The frequency is somewhat dependent on supply voltage.

The 74HC14 thresholds are proportional to Vcc. At 3.3V, the hysteresis shifts, changing the natural log constants. Your calculator needs a Vcc input.

This oscillator is not perfectly symmetrical (50% duty cycle). 74hc14 oscillator calculator full

With microcontrollers costing less than the 74HC14 itself, why bother with discrete oscillators? Because the 74HC14 teaches timing at the atomic level. The calculator transforms abstract math into tangible results — turn a knob (potentiometer) and hear the speaker pitch change, see the LED blink rate shift.

The 74HC14 oscillator calculator isn’t just a utility. It’s a pedagogical bridge between Ohm’s law and Laplace transforms. It’s the tool you open when you want to explain why a capacitor charges exponentially, or how hysteresis cleans up a noisy signal. The frequency is somewhat dependent on supply voltage

Schematic (textual):

Notes:

Replace the fixed resistor with a JFET or digital potentiometer. The calculator helps you map control voltage to frequency.

The frequency is determined by how fast the capacitor charges and discharges between the High Threshold ($V_T+$) and Low Threshold ($V_T-$). The 74HC14 thresholds are proportional to Vcc

To ensure the oscillator starts and runs reliably, you must respect the limits defined in the datasheet (e.g., NXP, Texas Instruments).