This circuit was found in documentation from the 1970s. However, it can be implemented with modern transistors such as 2N2222 for Q1 and BF494 for Q2. The crystal depends on the desired frequency.
This circuit has been found in an old American documentation, but can be easily implemented with common...
Suitable for the use with sensors, this circuit from National Semiconductor appears in other...
This circuit is from an old documentation and can be used to generate signals in different...