The RCA integrated circuit used in this control is uncommon today. The circuit is from an Electronics Now from July 1995. The sensor determines the value of the adjustment potentiometer.
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...