by AussieSusan » Mon Jul 12, 2021 3:48 am
They are not if you don't want to use them.
However if you are (lets say) wanting to build a monitor for a battery and to know then it falls below some preset value, then the comparator will be useful for that. Basically it is used to compare two voltages and tells when one is above the other. What you use that information for is up to you.
Susan