BFO Metal Detector using LF347N


Posted on Jul 24, 2012    6644

Here's a metal detector circuit that frequencies of the two oscillators are then mixed in similar fashion to BFO, to produce an audible heterodyne. On the surface of it, this design would seem to represent little more than a twinned BFO metal detector.



BFO Metal Detector using LF347N - image 1
Click here to download the full size of the above Image.

What makes the metal detector different above all else, and significantly increases its range, is that each coil modifies the frequency of the adjacent oscillator through mutual coupling. This introduces the "balance" that is present in an IB metal detector, and boosts sensitivity well beyond that of BFO.




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