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).
Under this name, Radioelectronics magazine published in the January 1974 issue a light exposure meter...
This circuit was found in Radio Electronics magazine from September 1965. It uses a thermal...
This power control from Motorola's 1971 SCR Power Control Fudamentals can control full wave loads...