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Originally Posted by Aurificus
"Plain Common Sense" is always the SIMPLEST answer.
Which part did he destroy?
A) Targets: That changes of of thermal energy in conductors and across semi-conductor boundaries produce electromagnetic effects. ie signals
B) LED Detection: Diode as as a "energy change detector" see above
Aurificus 
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Hi Aurificus,
The answer is "none of the above".
You provide choice "A" (Targets: That changes of of thermal energy in conductors and across semi-conductor boundaries produce electromagnetic effects. ie signals),
and choice B: (LED Detection: Diode as as a "energy change detector" see above).
But you missed the obvious point that everybody has been telling you from the start:
C) The variations of thermal energy that exist at the surface of the ground are so immense that they swamp any minuscule anomaly from a buried metal object below the surface, so as to make it undetectable.
As was pointed out by more than one member, there is a severe signal to noise ratio problem with the thermal energy theory.
A good analogy to this signal to noise problem might be: "It's as easy as hearing the sound of a pin dropping on the floor of a concert stage next to the drummer playing for a heavy metal band, from 20 meters distance".
Best wishes,
J_P