Where ( R ) is in ohms and ( C ) in farads.
To build the oscillator, a single gate of the 74HC14 is wired with a feedback loop containing an RC network. Schematic Setup
Let’s walk through a real-world design scenario to find the component values needed for an audio-range clock. Goal: Create a : Target frequency ( Target period (
R=10.8⋅f⋅Ccap R equals the fraction with numerator 1 and denominator 0.8 center dot f center dot cap C end-fraction :
Simplified empirical (5V, 25°C):
R=10.8⋅1000⋅(1⋅10-7)=10.00008=12,500 Ω=12.5 kΩcap R equals the fraction with numerator 1 and denominator 0.8 center dot 1000 center dot open paren 1 center dot 10 to the negative 7 power close paren end-fraction equals 1 over 0.00008 end-fraction equals 12 comma 500 space cap omega equals 12.5 k cap omega
You can switch between (target frequency) or solve for C by changing the Method dropdown accordingly.