This circuit can be implemented with other comparators in the same series. The circuit is from a component manual and the supply voltage between 3 and 12 V depends on the application.
This circuit, suggested by Signetics can be used as a shield. Modern operational can be employed...
In the figure we have a typical voltage follower. In a voltage follower the voltage gain is...
This 2001 circuit uses common transistors and can be used in an electronic lock. The relay trips...