The 74HC14 is one of the most popular integrated circuits for generating clock signals in digital electronics. It is a hex inverter with Schmitt Trigger inputs. This specific input characteristic makes it incredibly easy to build a stable relaxation oscillator with just one resistor and one capacitor.
) in series to prevent shorting the output when the pot is set to zero. 74hc14 oscillator calculator
Not for High Precision
The 74HC14 oscillator frequency varies with temperature, supply voltage, and chip-to-chip tolerance (~±10–20%). The calculator gives a nominal value only. Resistor (R): Connected between the output (pin 2)
Inv1 (1→2) ––R1––+
| |
C1 +––Inv2 (3→4)
| |
GND out
Resistor (R): Connected between the output (pin 2) and input (pin 1). The 74HC14 Oscillator Calculator: Theory