Hi,
Yeah, yeah...
But you didn't answer my question about WHICH METAL DETECTOR CAN DETECT A COIN ON SURFACE SOIL FROM METERS AWAY !?
Is not question of brand. Any built by you can do it in medium discriminative range, better.
As I said, you can't hear variation in few hertz but simple circuit can make audible.
The soil and and the environment are affected by difference in voltage and magnetics.
No more info.
Roma locuta, causa finita.
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