The PDK working as an LRL is just an illusion. You can take almost any non-motion detector circuit; replace the standard audio with a "beeper"; and adjust the sensitivity so that it's on the edge of instability. You then mount the coil in a horizontal position, and off you go. After that it becomes a trick of the mind. In a similar manner to dowsing, you start to see patterns in the random beeping (that are not really there) or are possibly due to multi-path reflections, and start following an imaginary "signal line". At some point you will reach an area that looks interesting to the subconscious mind, and you search around (now using the PDK as a real metal detector) and low-and-behold you find something! Of course, the "treasure" was never really detected from several meters away, but it's a good illusion. The PDK has the added advantage that it has a real metal detector built-in, whereas normal LRLers do their final recovery with a different detector.
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