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I post in another thread, yesterday, the parts of the radiofrequency gold-silver detector under the title: "Exactly as conventional MD". The search head is a coil, all the detector is homemade, the plastic search head like "air styler" was used for photographic laboratory. Is a good housing because was easy to build in it, but the variations in models is big.
Consist in two parts: the search head, this is a coil with oscillator, linked by a shielded cable, and a aluminium box with antenna sustained by the neck, in this model. Transmitter-receiver like a radar.
I have impressive quantities of photos, my idea is to put in a book.
If can found a gold chain, can found a treasure. You need an only experience for to convert in phanatic!
Here you can see better:
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