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 somewhat critical circuit was found in a year 2000 documentation. The frequency depends on...
With this passive circuit it is possible to modulated in amplitude a low intensity RF signal. The...
This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is...