Dynamic Temporal Sampling Detector

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Most black sand I see at beaches is magnetite and does not have a viscous response, it has a more instantaneous response. But, yes, salt response is pretty fast but maybe not 6-8us; I've successfully run a PI in salt at 7-8us but 12us is safer bet.

Ok, I am guessing the bi-polar pulse will allow the magnetic susceptibility(iron magnetization) to be cancelled. Even so, it should be well gone by the time the SMT1 begins counting.

Cycle 1 reads: Target + Sand
Cycle 2 reads: Target - Sand (after U2b inversion)

No matter whether the microcontroller fires a positive pulse or a negative pulse, the black sand always pushes or drags against the search coil in the exact same physical direction.
Therefore, in pure physical reality, it is always a Positive Addition +V(susc). So in a negative pulse(cycle 2) results in ( -)Target + Sand, and after U2b inversion, the result is Target - Sand.

Maybe I will eventually test 10 microseconds. It is a nice round number.

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On a side note, any KC fans out there? I just had a listen to "starless" for the first time. I was blown away. I never knew about KC before.

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I might use TS5A3159 for switching the bridge in a final version.

Or even the DG417 for through hole.

The 4053 is always a nightmare for me to route, and a switch is wasted. Besides, there are so many versions, with slightly different specs, some may not work at all.

[Carl-NC]

Cycle 1 reads: Target + Sand
Cycle 2 reads: Target - Sand (after U2b inversion)

No, the magnetic response will be the same polarity as the eddy response:

Cycle 1 reads: Target + Sand
Cycle 2 reads: Target + Sand

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No, the magnetic response will be the same polarity as the eddy response:

Cycle 1 reads: Target + Sand
Cycle 2 reads: Target + Sand

Ok, yes, I understand now. Thank you for that correction.