Dear Charles Patton,

       I have came across the use of the NE5521 LVDT Integrated Circuit in a 
SG type sensor kit from an Italian firm. I checked back through the archives 
and noticed that you had mentioned this beastie way back in 1997! 
       
       Do you know if anyone has ever evaluated it for amateur seismic work, 
please? The spec sheet does not look too exciting, but no actual noise or 
drift figures, particularly for frequencies below 10 Hz, are quoted.

       Regards,

       Chris Chapman

       

Dear Charles Patton,



       I have came across the use of the NE5521 LVDT Integrated Circuit in a 

SG type sensor kit from an Italian firm. I checked back through the archives 

and noticed that you had mentioned this beastie way back in 1997! 

       

       Do you know if anyone has ever evaluated it for amateur seismic work, 

please? The spec sheet does not look too exciting, but no actual noise or 

drift figures, particularly for frequencies below 10 Hz, are quoted.



       Regards,



       Chris Chapman