On Tue, 19 Oct 2004, Andy Meng wrote:

> These sensors are inductive? So basically there is a metal gear, and the
> sensor senses each tooth?

They are differential gmr sensors with a bias magnet built in. Old ones 
may have been the oscillator type. They have to get close to the teeth and 
stay that way while the wheel experiences violent accelerations from road 
umps etc.

Peter
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