The circuit is of the Motorola Linear Databook of 1990. The power source must be symmetrical and the characteristics of the circuit are given next to the diagram.
We find this vibrato configuration with transistors in a 1987 documentation. The components are still...
This oscillator with the 4049 can generate signals up to about 14 MHz according to the article in the...
Found in a 90s Popular Electronics, this circuit provides sinusoidal signals at frequencies given by the...