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.
May 2016 - It can be obtained from Mouser Electronics new display 1092 from VDC. The new LED...
With this circuit it is possible to raise the characteristics of a transistor by checking its gain...
This circuit was found in an Analog Devices manual and can supply a 3 mA current or drain a 10 mA...