This circuit was found in a 90’s Electronic Engineering. The integrated circuits are of the time and the diodes are of general use. The generated signal is sinusoidal.
Published in Popular Electronics with the curious name of Obnoxious Noisemaker, this 1968 circuit...
We found this circuit in the July 1992 issue of Radio Electronics magazine. An optical system...
This circuit was found in an English magazine from 1978, but it is still current, just change the...