Found in 90's Electronic Engineering this circuit can be used to measure phase angles between two signals from 0 to 180 degrees. The components used admit modern equivalents.
We found this game for two competitors in a Popular Electronics from the 80's. The circuit can be...
This is an improved version of the previous circuit that includes speed control. The engine can be...
We found this circuit in a 1997 documentation. It is possible to automatically reverse the...