This logic circuit that transfers the level from one gate to the next with each clock pulse was found in the September 1985 issue of Radio Electronics magazine.
In the figure we have the way to use a stepper motor as an encoder. Operational amplifiers can be of...
Placed inside the refrigerator, this circuit triggers an oscillator when the part is opened...
We found this circuit in an old documentation from the 70s, but it can be assembled with more...