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Looking for: Metal detector for Non-Ferrous metals. Answered

I'm looking for a detailed schematic ( or two ) on a metal detector capable of locating non-ferrous materials to an extent. ( titanium in specific )  I recall finding a fair bit of documentation on such a thing a few months back, but I can no longer recall the exact method that they used.

If anybody knows where I can find some detailed information and/or schematics I would very much appreciate it. 
I have a reasonable amount of experience in building somewhat complex circuits, and can learn what ever I do not yet understand, hopefully. ;)

I have a very good object to test such a device on, should I manage to build one. It's something I keep close to me at all times, and goes wherever I go.   ( that sounds kind of like a riddle )
On a side note; anybody had Deja Vu over four times in an hour? I think my mind is running in loops.

Any help or insight would be very much appreciated. 


I'm not so sure about that, as the majority that I've had my hands on were only ever able to detect ferrous metals. I have an old detector with a "non-ferrous" dial on it, but the detector is broken, and the coils managed to get destroyed.

All metal detectors will find non-ferrous metals. That's why detectorists in the UK can find hoards of gold...