The circuit shown in the figure below is from the 1993 Linear Technology Applications. The operational ones used are uncommon and the use of equivalents can be analyzed.
Using a symmetrical source this circuit reverses the rotation of a small motor through light...
Here we show how two 4017s can be cascaded to count above 10. The circuits are driven by a square...
We found this car theft alarm circuit in a 1988 publication, but the components used can still be...