We found this circuit in the March 1992 issue of Radio Electronics magazine. The circuit has a range from 1.25 V to 1 kV. The formula for the voltage values is given.
This small preamp for low impedance microphones was found in a Popular Electronics from November 1968....
The CA3162E and CA3161E pair were widely used to create a 3-digit digital display. This basic...
This circuit, which uses common components even today, was found in a 2001 documentation. It is an...