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So for a quick estimate: ( R ) in Ohms, ( C ) in Farads → ( f ) in Hz.

[ T_total = T_RC + 2 \cdot t_pd ]

Or, equivalently: [ f \approx \frac11.2 \times RC ] 74hc14 oscillator calculator full

Given typical 74HC14 parameters at Vcc = 5V, the threshold voltages are roughly ( V_T+ = 0.63 V_cc ) and ( V_T- = 0.37 V_cc ). When you plug these into the equations, the natural log terms simplify to approximately . Therefore: So for a quick estimate: ( R )