This amplifier is from Motorola's 1990 Linear Databook. The circuit can be used with operating amplifiers with the same characteristics and the power supply must be symmetrical.
The circuit shown in the figure was suggested by National Semiconductor in its 1994 Linear...
We found this circuit in an American publication from 1977. The circuit drives two LEDs according to...
This automotive alarm uses common components and is suitable for old vehicles. The circuit was...