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Got the book today with a little delay because of the Postman's stupid way of delivery . I must say that the general info is good for any new-be in the Detectorbuilding business .The circuit that drew my attention is the DBP 2010 PI detector . Quite nice with a lot of possibilities . A little light on the coil construction though . Aspecially the large 1 x1 meter coil ( There is also a possibility for a 2 X 1 meter coil . I will get it though . The housing is predesigned and has to be bought from the author . If you are handy you can redesign one though . In general I like this detector and will go on building a few . Depth up to 4.5 meters with the large coil ? I hope so ! Kees