Thank you all for your replies. To summarize, I've received a lot of
educated speculation as to how these work, but no one actually knows for
sure. The leading candidate seems to be sensing different amounts of
current. I am planning a bit of exploratory work, as I am in the process
of fixing one of these units. If I come to a more definitive conclusion, I
will let the group know, on the outside chance that someone else in the
world is curious. Thanks again.
-Steve
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