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Building a Hall Effect Gear Tooth
Sensor
Figure Five:   The complete Hall Effect gear tooth sensor
assembly
Figure Seven:  The bottom view of the Hall Effect gear tooth sensor
showing the 2-56 assembly nut glued to the bottom of the circuit board.
The 2-56 nut was glued using five minute epoxy.
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or
a
Ferrous Object Position
Sensor
Figure Six:  This figure shows another way the magnetic circuit can be constructed using three
small magnets from K&J Magnetics,  www.kjmagnetics.com, and a small steel pole piece.