This circuit was obtained in a 80s American documentation for radio amateurs. The circuit produces a pulse of constant duration for dots and dashes.
This TTL dice was found in an old American 1980s documentation, but can still be easily assembled....
This simple experimental circuit drives LEDs in sequence. Only transistors are used, and the power...
We found this circuit in a 1967 RCA SCR manual. The circuit uses components from the era. The...