This circuit was found in an American documentation from the 90's. The transistor is a general purpose one. The circuit oscillates well between 12 and 30 MHz with the indicated components.
A configuration like the one used with the 4013 is also suitable for the 4027. The amount of time...
We found this circuit in the Audio Handbook of the National Semiconductor of 1977. The circuit is used...
We found this configuration in an integrated circuits manual. The transistor, which can be of any...