In this 1990s circuit, found in a National Semiconductor manual, the output voltage is the square of the input voltage. The components are from the period.
This circuit is part of an article published in the March 1990 issue of Radio Electronics...
Found in an American publication from 1968, this circuit aims to keep the torque of a DC motor...
In the figure we have the typical circuit of a Baxandall tone control applied to an operational...