def hc14_osc_freq(r_ohms, c_farads): return 1 / (2.2 * r_ohms * c_farads)
| Desired Freq | Suggested R | Suggested C | Stability | |---------------|-------------|----------------|------------| | 0.5 - 20 Hz | 100k | 100µF (polarized?) | Poor – leaky | | 20 - 200 Hz | 100k | 10µF | Fair | | 200 Hz - 2 kHz| 10k - 100k | 0.1µF - 1µF | Good | | 2 - 20 kHz | 1k - 10k | 1nF - 100nF | Very good | | 20 - 200 kHz | 1k - 10k | 100pF - 1nF | Good (watch layout) | | > 1 MHz | 1k | < 50pF | Poor – use crystal | 74hc14 oscillator calculator
f=1.2100,000×0.00001=1.2 Hzf equals the fraction with numerator 1.2 and denominator 100 comma 000 cross 0.00001 end-fraction equals 1.2 Hz This results in a time period ( ) of approximately per cycle. Why the 74HC14? def hc14_osc_freq(r_ohms, c_farads): return 1 / (2