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.
In the diagram we show how to divide the frequency by multiples of 10 using several CMOS...
The integrated circuit used in this application is a double 741 from SGS. The supply must be...
This circuit was found in a 1978 English magazine. It is a configuration that aims to select the...