Metal detectors are a fascinating hobby. One can with some luck, find very interesting artifacts from the past or improve on the beach with his cash coins. BFO, pulse induction, VFL, there are different technologies. Here some interesting links and building instructions.

Here you will find Schematic Circuit Diagram for DIY and further information on Metal detectors
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Small, but nice detector with microcontroller control board and	home.skif.net/~yukol/MetalE.htm
Something more complex detector Pulsinduktionsprinzip	metaldetector.bratsk-city.ru/shematic/PI/twinloop.pdf
Site with many circuits on Metalltetektor BFO detectors, PLL detectors, PI, VLF Very informative	www.thunting.com/cgi-bin/geotech/pages/common/index.pl?page=metdet&file=projects.dat
Site with many circuits on Metalltetektor BFO detectors, PLL detectors, PI, VLF, magnetometer Very informative	www.thunting.com/cgi-bin/geotech/pages/common/index.pl?page=metdet&file=projects.dat