PI ground balance circuit

[liudengyuan]

For help, about the best method and circuit diagram of the pi detector's ground balance, and the schematic diagram of the double coil PI, thank you.

[waltr]

Lots and lots on this forum using many methods.
I added GEB using the Three Sample method to my Hammer Head. Advantage of this method is it is all done in the microprocessor's code with sample timing so works with any of the simple PI circuits.
Also built and use concentric and DD coils.
Details on GEB and Coils here: http://www.geotech1.com/forums/showt...ake-on-the-HH2

Otherwise a second complete integrator channel is required. Study the TDI detector schematics and the SD2000 and MineLab patents.