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 circuit on a Radio Electronics. Similar configurations can be found in this section. The...
This circuit was found in the January 1989 issue of Radio Electronics magazine. The circuit sends...
This circuit is from General Electric from the 80s, using a relay with high current contacts (20...