This circuit is from a National Semiconductor manual from the 1980s. The integrated circuit is rare today and next to the diagram we have the formula for calculating the components.
We found this circuit in an English documentation from 1995. The Hall sensor used is from the time...
The gain of the operational amplifier shown in the figure depends on the feedback resistor,...
This circuit was found in an Electronic Design from 1968. Its purpose is to produce synchronized trigger...