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not all AC is high voltage.
There primary reason for using a low voltage AC supply to the probes is to prevent the probes from suffering electrolytic corosion. ALso any impressed current flowing through the probes into a wet bilge adds to the electrolytic corrosion issues in the boat in general
There are a few integrated circuits on teh market that use an AC probe , rather then the DC proble here.
Dont get me wrong though the circuit is fine. its only a small point.
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