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In this page, I introduce the square wave oscillator which used the Schmitt inverter circuit which was made with the CMOS.
The Schmitt inverter circuit has the hysteresis characteristic. The circuit to introduce is the oscillation circuit which used this characteristic.
By the hysteresis characteristic, the voltage which becomes the H level with the input voltage of the inverter rising from 0 V (Voltage that the output becomes 0 V) and the voltage which becomes the L level, descending from +5 V (Voltage that the output becomes +5 V) are different.
When using 74HC14, the rough estimate value of the oscillation frequency can be calculated by the following formula.
Data sheet for 74HC14