Very often, when building different electric generators or motors, it is required to determine the pole of the magnet. Almost every person from school physics lessons knows that the magnet has two poles: the north (denoted by the blue color with the letter "N") and the southern one (denoted by red and the letter "S"). This simple electronic detector will help you determine the name of the pole of the magnet. For its not built you will not need scarce parts and components. As a sensor in the detector, a Hall sensor is used, which can be removed from an old cooler from a computer. Fortunately, such “good” is now in bulk. As you know, computer fans incorporate a brushless motor. Which consists of two windings at anchor and a switching element - Hall sensor. This sensor switches the windings depending on the position of the movable magnetic ring located in the impeller.
Magnetic detector circuit
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