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 can be powered by 2 or 3 small batteries. The resistor can have values between 220...
More and more supercapacitors are being used as supplementary sources of energy in several...
This circuit for ceramic cartridges was found in the March 1993 issue of Electronics Now magazine. Q1...