The frequency and the ampiltude of the voltage changes as the magnetic teeth speed increases or decreases . As the teeth magnetic field approaches the sensor it creates negative voltage first then as it gets next to the magnet there is no vltage created because no magnetic field are being crossed , as the magnetic teeth field starts going away from the magnetic pick up sensor it craetes positive voltage which we see on the graph above or the video below will show as we rev the engine up the frequency and amplitude increases rapidly.
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