> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Ed Browne
> Sent: Monday, February 06, 2006 12:55 PM
> 
> You can build a dc active current sensor using a GMR and a 
> differential amplifier.  Sensitivity can be improved by 
> wrapping turns  under the GMR.  I used multiple small traces.  
> Bandwidth is primarily a  function of the diff amp.
> 

I am not familiar with GMR. How good the sensitivity can it
be and what is the measuring range? Can it fulfill the
OP's requirement (5mA to 1A with resolution of say 1mA)?

Regards,
Xiaofan

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