On 27 September 2016 at 19:09, Ken Strauss <ken.stra...@sympatico.ca> wrote:

> I have no idea if this is the actual scheme used with the MP3.

The MP3 is much simpler. There is a coil (possibly with a ferrite core)
that is completed by the probe contacts.
That is in resonance with the detector when the probe contacts are closed,
and not when they are not.

I assume there is the rest of an LC bridge circuit in the transmitter, an
oscillator, precision (op-amp) rectifier and level detector.

"A motorcycle is a bicycle with a pandemonium attachment and is designed
for the especial use of mechanical geniuses, daredevils and lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916
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