Hi
The picture in Mineoro thread is a machine type high-voltage, but in this case the high voltage "emerge" from the sharp-end of the central solid bronze antenna. The round copper disc is the "receiver". Incredible, but this machine works better near high voltage lines. No many technical details have about it...
The original Elektor 's "water finder" (in Spanish "ZahorÃ*") suffers some modifications. I added two more lateral antennas to 0 V, and use an only sensibility control, the 10 k pot. This circuit work fine at 4.5 V, 1.5 V AA batteries, dual +/- 4.5 V.
The audio output connect to an audible signalizer type bip-bip. So, convert any "bad" tac or tic or etc. in a bip-bip.
The antenna has not direct connection with the IC, I use 100 pF.
Yes, sure, also you can find buried long time metals with it.
Here a classic idea of antenna for ions detection. For replace the both lateral telescopic antenna in Zahori or for the Ivconic's project.
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