This circuit is from a 1968 Electronic Design. The characteristics of the output transformer are not given and the transistors are of the time. The circuit provides a power of a few watts.
September 2016 - It can be obtained from Mouser Electronics the new integrated circuit µCC21520...
This interesting circuit was obtained from a 90's EDN. What it does is generate negative voltages...
This 2 Hz relaxation oscillator was found in a 1970 EEE. The circuit uses transistors from the era...