Technical details of my simple gradiometer.

In my previous video    • Building a fluxgate gradiometer - sim...   , I presented a very simple gradiometer. In this video I will improve the gradiometer by using a better sense coil and adding some gain to the final instrumentation amplifier.
I will also present the schematic of the probe and of the main board. The other schematics have been presented in the fluxgate magnetometer playlist (    • Fluxgate magnetometer   ):
The saturation power drive (    • The power drive of my fluxgate magnet...   ),
The time base (    • The synchronous detector and time bas...   ) and
The power supply (    • The ADC and Display of my Fluxgate Ma...   ).