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 is a configuration much explored by assemblers, being found on this site in dozens of similar...
September 2016 – At Mouser Electronics is available audio drivers for the purpose of suitable...
This circuit has a thermal chamber that acts as a stabilizer, compensating for the ambient...