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Submitted by airman00 on February 21, 2008 - 11:16pm.
Here is a brief explanation of comparators .
A comparator is an integrated chip that compares two voltages on its legs and provides a digital output based on the inputs.
In a comparator ( as shown above in the diagram) , the V+ input votlage and the V- input voltage are compared. When there is more voltage in V+ then in V- ,the output of the triangle( comparator) is logic 1, or + 5 V
Thanks ed1380 for the schematic
Now comparators come in multiples , and in chips together. Like in the LM339 chip there are 4 comparators built in.
For more info visit the links below ( which are also my sources)