my first version of that log just get lost MRI first version have both max 0,5Tm two pairs coils i use Maxwell and Helmholtz coils what use to solve some problems to magnetic field Helmholtz and Maxwell coils have coil turns Helmholtz coils turns is same and Maxwell have that number R have Helmholtz coils turns number sensor have idea I get  to one hackaday.io project link https://hackaday.io/project/5030-low-field-mr

 there have magnetic camera module making idea what i use Fe80Ni20 metal alloy to make sensor thank Peeter Jansen and then i have problem how amplify signal but that have in log II.