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The Hall Effect
In message <882565FA.00538089.00@fcpa_nt6.fcpa.fujitsu.com> "Matt Rooke" writes:
> Umm, good try, and maybe more appropriate than the right answer...
> The Hall effect is what happens when you move a magnet past a properly aligned electrical coil- you get a voltage at the
> terminals of the coil. Now if that magnet is attached to a rotating shaft, you can measure the speed of the shaft
> rotation by the frequency of the electrical pulses from the coil.
But this is _not_ the right answer - there's no coil in a Hall sensor.
A Hall sensor is a piece of semiconductor through which a current is
passed. Think of something the shape of a football field, with electrons
flowing between the goals. If a magnetic field appears, perpendicular
to the surface, those electrons are going to miss the goal and perhaps even
leave the field by the side lines. Which is where a Hall sensor has
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