This sensor circuit from a 1967 Ferranti documentation uses components from the era. The circuit can be used as a shield, although the integrated one used is unusual today.
This circuit can be adjusted between 0.2 and 2 V to trigger with chosen voltages comparing them with...
The configuration shown in the figure has been requested a lot by many readers who need a circuit...
In the figure we have an amplifier step configuration with a transistor suggested by a 1985...