FGM-3h Gradiometer

[Francisco Xavier]

I am assembling a gradiometer based on FGM-3h. I connected directely the sensor output to inputs of 4013 flipflop without a Schmitt Trigger circuit. Have anybody tried it before? Does it work?


Another question, does the circuit printed on mr.Carl Moreland article works with the FGM-3h just on West-East direction (on the linear response)?


Thanks in advance.


Francisco Xavier

[Erich Kern]

Francisco,


The FGM-3h should not be used for the gradiometer circuit because the FGM-3h will saturate and become useless unless it is kept in an east-west position. Please only use the FGM-3 in Carl's circuit.


Regards,


Erich Kern


Fat qQuarters Software

[Erich Kern]

Francisco,


To answer your other question, I've tried the 4013 both ways, and it works best with a Schmitt trigger. Especially on the clock input to the 4013; the rise time of the pulse from the FGM-3 isn't sharp enough and the chip I used overheated. I used a 4093 on both FGM-3 outputs.


Regards,


Erich