This circuit was found in the February 1992 issue of Radio Electronics magazine. The circuit provides stepped frequencies as shown in the diagram.
Found in a 1979 documentation, this circuit measures resistances on 5 linear scales. The precision is...
This circuit, from 1990 documentation, can be assembled with BC558 transistors for Q1 and Q2,...
Found in American documentation from the 90's, this JFET stage has an input impedance of 500 M...