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.
This interesting circuit from Radio Elecronics from October 1965 shows a flip-flop or bistable with...
The basic idea of the circuit shown in the figure is to increase the brightness of an ordinary...
Found in an American documentation, this regulator supplies a current according to the integrated...