Schmitt Trigger Oscillator

We can build oscillators with Schmitt-trigger based circuits. Schmitt-triggers ICs like 40106, 40014, and 74HC14 are available and can be used for the purpose.

$$frequency = \frac{1.2}{R \times C}$$

Here is a precalculated list RC pairs to select.

	Resistor	Capacitor	Frequency
Low Frequency	4.7 MΩ	220 uF	1.2 mHz
	1 MΩ	100 uF	12.0 mHz
	10 kΩ	10 uF	12.0 Hz
Medium Frequency	2.2 MΩ	22 nF	24.8 Hz
	100 kΩ	100 nF	120.0 Hz
	2.2 MΩ	1 nF	545.5 Hz
High Frequency	1 MΩ	1 nF	1.2 kHz
	100 kΩ	470 pF	25.5 kHz
	10 kΩ	47 pF	2.6 MHz

References

• THE SCHMITT TRIGGER from Talking Electronics site.