Salvaging Hall Effect Sensors and Neodymium Magnets - Build an RPM-meter

In this video I demonstrate how both "Hall Effect Sensors" and "Neodymium Magnets" can be salvaged from broken or outdated devices. I show several possible applications, like detection of magnetic fields and RPM-measurement.

My Video about the first car stereo hack: https://www.youtube.com/watch?v=a32neZo3McY

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