This circuit that draws 1 out of 8 LEDs was found in an 80's American documentation. The circuit can also work with an astable using the 555 instead of the 4046 which is not a common component today.
This circuit was proposed by an old American documentation for listening to SSB stations. The...
This simple unijunction transistor application appeared in Radio Electronics magazine in June...
This 80's circuit can be used in media recovery. The integrated circuit is of the time, but modern...