This circuit is from Motorola's 1990 Linear Databook. We can implement it with other operational amplifier. The power supply must be symmetrical.
The circuit in the figure is from a source with the possibility to adjust the output voltage from...
We found this circuit in a 1965 General Electric manual. The circuit applies to incandescent lamps only and...
We found this circuit in an American publication from 1977. The circuit drives two LEDs according to...