Detector de metales B.F.O. Primera parte.
In this video, I begin building a metal detector, specifically the well-known ETI 561 from Geotech (www.geotech1.com). The documentation can be downloaded from that website in PDF format. It contains the materials list, wiring diagram, and a detailed explanation of the circuit's operation and how to build both the circuit board and the coil. In this first part, I will build the detector coil, following the instructions in the downloaded PDF document.

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