This traditional configuration of astable was found in a 1965 documentation. Transistors can be more modern types like BC558, and capacitors can be changed. The circuit works with voltages between 3 and 9 V.

This traditional configuration of astable was found in a 1965 documentation. Transistors can be more modern types like BC558, and capacitors can be changed. The circuit works with voltages between 3 and 9 V.