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 circuit is from an old American documentation using as indicators for the flip-flops neon...
This circuit that uses only discrete components (transistors) mimics the sound of an American...
July 1017 - Maxim MAX17290 and MAX17292 PWM boost controllers can now be purchased from Mouser...