It is very simple but work fine,it is a dowsing rod with signal generator from the mobile,with 8700 khz i have silver coins detect,with 11700 bronze coins
It is simple connection, over so called "waste time" circuit.
WM6,
I thought the same as you did a few years ago.
After having tried "in the field" a great variety of circuits, the last one was a circuit that works like the models of the brand "compass" ... I mean the same type of signal transmitted.
The result (for me) was that it worked! (Although you do not believe it)
In my country is said a phrase "believe or burst"..
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