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 documentation from the 90s, this circuit was used in communications receivers of the...
Found in a Hands On Electronics from the 80's, this circuit activates a relay with alternating...
We found this circuit in a Radio & Electronics Constructor of November 1975. The magazine no...