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 was found in an American 1980s documentation. The transistors admit equivalents and the...
We find this circuit in a 1980s documentation. The circuit can be applied to modern operators with...
This circuit is from Mullard documentation from 1969. Transistors support current equivalents. Output...