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.
The circuit presented was found in the National Semiconductor Linear Applications Handbook. The...
With the circuit shown in the figure we have a frequency modulation which is produced by a...
The configurations of the two previous circuits can be modified to operate with a simple power...