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Page Two of  Six

Building a Hall Effect Gear Tooth  Sensor

or a

Ferrous Object Position Sensor

Figure Three:   This is a picture of the magnetic circuit that is assembled  and glued on to a piece of electronic circuit built-it board. The assembly pole piece can be made from any type of magnetic steel. The magnetic circuit in the patent does not use a pole piece and the magnetic circuit will work if one is not used.  But using an assembly pole piece to help glue and hold the magnets in position will make building the magnetic circuit much easier.  The air gap between the magnets must be large enough to permit mounting of the Hall Effect IC. The two magnets were attached to the assembly pole piece using supper glue.  The magnetic circuit assembly was then attached to the circuit board material using five minute epoxy.

Figure Four:  The  Hall Effect position sensor assembly parts.

Figure Four:  This figure shows the two basic Hall Effect sensor assembly parts.   The electronic circuit board on the left contains the Hall effect IC sensor, the load resistor, and two by-pass capacitors.  The circuit schematic is presented in Figure Eight.  The magnetic circuit board on the right has a slot cut in it so it will fit under the screw and washer on the electronic circuit board.  The magnetic circuit board is then adjusted up or down so the Hall Effect IC sensor will received the correct magnetic bias for the proper electrical switching characteristics.

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