This simple Morse Code oscillator was found in a 1980s American documentation. The power supply should be powered with 5V and the integrated can be the 7400.
Found in Popular Electronics from the 1980s, this circuit is intended for switching filters with...
This circuit was found in a Japanese publication from the 1960s. The circuit uses a class B stage...
This circuit appears in other versions in this same section of the website and in other sections with...