I have been asked to repair some Weigand card readers.  Luckily most  
of them have problems with the external electronics.  One however,  
has something wrong with the excitation magnet or the reader coil.   
It has been 30 years since I studied Weigand effects and I do not  
remember any
theory.  I believe a Weigand wire has to travel through a magnetic  
field and then past a coil.  I do not recall what the characteristics  
of Weigand wire are.  Google has not been my friend on this one.   
Could anyone point me toward some information on the theory of  
Weigand wire and/or readers that sense Weigand wires in cards ?

Best

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Cedric Chang
Denver, CO   720 222 1309


All ideas, text, drawings and audio , that are originated by me,  and  
included with this signature text are to be deemed to be released to  
the public domain as of the date of this communication .  CC
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


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