This circuit was found in the Electronics Experimenter Handbook from 1991. The sensor is a diode and the circuit has a relay according to the voltage used in the supply.
The circuit shown in figure 1 is a suggested application for ISL8107, a new integrated circuit from...
This NOR or NO-OR function circuit with a general-purpose transistor can be powered by voltages from 5...
When an alternator is used to supply constant current, it needs an adjustment that must be made as...