Since I can't edit my original post, I wanted to clarify, the exact inductor I'm using is the Neosid sd75 (10mH). Here is the datasheet:
Thank you! The red/blue line graphic really helped! I found that when I mounted the inductor vertically, and ran a wire horizontally across it (parallel to the PCB), I got the best results, which matches your graphic. Basically the energized wire should be perpendicular to the core of the coil.Good picture.
Worse option: There are several types of self shielding types of coils. No good to you.
View attachment 222567
In this picture I drew a heavy red wire and a blue wire. The red wire will introduce a signal into the coil while the blue wire will not.
View attachment 222568
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by Jake Hertz