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Anybody ever seen this book? I wonder what 2-IC design is worth 15$ the seller asks.
The description below is from Ebay (I have removed ad data).
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The "GOLDFINGER" (non-Ferro Metal Detector Plan)
Circuit diagrams for a metal detector that detects Gold, Silver, Platinum, Copper and Aluminum objects and minerals - rejects all ferromagnetic objects. The Goldfinger is designed to highly discriminate between non-ferro and ferro metals. It uses only two ICs. All parts cost about $50. Detection in soil is possible to greater than about one foot. Fascinating principles, design. Recently updated; includes much more info on freqs, search coil technology and other metal detector types.
Author, John J. Williams, M.S.E.E.
Estimated word count for this manual is 8,100. ISBN: 0-934274-88-6. Edition 2003.DISCLAIMER: I assume no responsibility for this or any other publication of mine. Sold for legal educational and entertainment purposes only. No return or refund. LIMITED CIRCULATION.
The description below is from Ebay (I have removed ad data).
################################################
The "GOLDFINGER" (non-Ferro Metal Detector Plan)
Circuit diagrams for a metal detector that detects Gold, Silver, Platinum, Copper and Aluminum objects and minerals - rejects all ferromagnetic objects. The Goldfinger is designed to highly discriminate between non-ferro and ferro metals. It uses only two ICs. All parts cost about $50. Detection in soil is possible to greater than about one foot. Fascinating principles, design. Recently updated; includes much more info on freqs, search coil technology and other metal detector types.
Author, John J. Williams, M.S.E.E.
Estimated word count for this manual is 8,100. ISBN: 0-934274-88-6. Edition 2003.DISCLAIMER: I assume no responsibility for this or any other publication of mine. Sold for legal educational and entertainment purposes only. No return or refund. LIMITED CIRCULATION.
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