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 is the basic configuration of an operational amplifier sample & hold circuit. The FET and...
Microchip Continues Expansion of AVR Microcontroller Product Line with Addition of Three New...
The circuit shown, with the printed circuit board, was found in an article in the June 1990 issue...