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I introduce the square wave oscillation circuit which used the CMOS inverters in this page.
This circuit is the circuit which is often used by the following reason.
The oscillation frequency can be calculated by the following formula.
Data sheet for 4069UB
U in the name means "Unbuffer".
It shows not to be using the buffer circuit for the output circuit.
B shows to be based to the standard of the B type of EIA/JEDEC as the standard of the CMOS.
(Electronic Industries Association/Joint Electron Devices Engineering Council)