Hall effect stuff
I 'recovered' these hall effect devices from the motors of 5-1/4" floppy disk drives (the half height, brushless motor kind)
Here's what the little fellows look like:
A note that the depression on one side is used to sort out which side is which
By means of some reverse engineering I was able to deternime that a ~10mA current is passed through pins 2 and 4 (2 being the negitive end) from there I was able to use an op-amp to recover a signal, thusly:
The output of that could be fed into a 74XX14 (schmitt inverter) to clean it up a little.
have fun with it!!
There are no spelling erors in this, my room is declared as a seperete country in wich the rules of spelling are difrent.
I don't take responceability for you getting in trouble for taking apart other peoples computers for partz. I do make mistakes, and if there is one in a schematic i have provided you have my permission to write me a mean letter.
Back, need more be said?
Rue Mohr, Member of planet earth (currently)