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.
In the figure we have a two-channel preamplifier with two 741 integrated circuits. The circuit is from a...
This shield was found in the June 1995 Electronics Now magazine. The circuit uses a low-power...
We found this circuit in a 1970 General Electric manual. The circuit uses components that are...