This circuit can be used to obtain a zener voltage from a common zener of another value, adjusting in a multimeter. The circuit is from an American documentation of the 1970s.
Found in a Popular Electronics from the 90s, this circuit can be made with current equivalent...
This circuit uses three flip-flops and two NAND ports to obtain a frequency division by 5,...
You can program the 4018 in other ways, as shown in the figure. In this 7 divider configuration, for...