This circuit is from a 60's documentation. The capacitance C1 can be between 20 pF and 0.01 uF depending on the generated frequency. Equivalent transistors may be employed.
The author has many books he had written in Eglish (See the Biography) published by famous...
This circuit is from an old publication of the 70's. It can be implemented with modern transistors like the...
This configuration often addressed on this site is from a 2000 documentation. The circuit can be...