We found this circuit in an 80's Electronic Design. It makes use of couplers of the time that can be replaced with 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...