[chbot] Hall Effect Sensor : free ones

[Morris]

You can find surface mount ones used for brushless motors on disk
drives. Check out 3.5" floppy drives, CD-ROMs and probably hard drives -
look for a surface mount device near the windings of the motor for the
disk spindle - looks like a SOT23 which the magnets pass over.

Another source could be an 80's+ car - they are used in various places
especially for speed detection e.g. slip detection for brakes.

I have also seen them on various old printers and video recorders.

That is my own experience, but Google will tell all!
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