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.
This linear circuit was found in a 1965 Electronic Design. The transistors are from that time....
This filter was found in the May 1989 issue of Radio Electronics magazine. The components can be...
In the figure we have the way to make the connection of voltage regulators in series to obtain a...