This is the basic configuration of an operational amplifier sample & hold circuit. The FET and transistor are commonly used. The circuit is from an 80's documentation.
The circuit bellow shows how four inverters [NAND, NOR or Inverters] Kim - This could be NAND,...
This simple circuit allows testing of CMOS 4001 and 4011 integrated circuits. It consists of an...
Found in documentation from the 1980s, this highly sensitive circuit is based on the conduction by the...