GB in fig 12-19

[6666]

On page 174, fig 12-19 shows a brief circuit idea for a PI Ground Balance ,
has anybody done any work on this idea and come up with a working circuit ?
thanks
6666

[Carl-NC]

It's a subtractive method used on the TDI other commercial detectors, and I believe a few home-brewers have tried it.

[6666]

Thanks Carl.