These circuits were found in the February 1995 issue of Electronics Now magazine. The circuits have normal response in (a), boost in (b), cut in (c), and plate response in (d).
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...