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.
The circuit we present was found in an English magazine from 1980, but it can be easily assembled, as...
We found this circuit in an American documentation from the 90s. The circuit produces a 1 kHz...
By activating S1 the relay closes its contacts only after a certain time interval that depends on C1....