This diagram was found in the November 1972 issue of Radio Electronics magazine in an article describing benchtop equipment. The transistors are of the time and the frequencies are given by the coils.
The integrated circuit used in this application is not currently common. The circuit is from 80s...
This circuit was obtained in an Electronic Design from the 90s. The circuit uses transistors from the...
This circuit hás a Power output of more than 1 W. It is used in small experimental or low power...