Steve Herschbach Posted February 20, 2014 Share Posted February 20, 2014 Gold Prospecting with a VLF Metal Detector by Dave Johnson Chief Designer, First Texas Products & Fisher Research Labs March 2010 Edition This book explains how to use a VLF metal detector for finding gold. The author has nearly 30 years’ experience in the metal detector industry working for several different companies, and designed several of the most popular “gold machines” on the market. These include the Tesoro Lobo, White's GMT and MXT, and of course the Fisher Gold Bug and Gold Bug 2. Although the product emphasis is on the machines currently “Made in El Paso”, the features of competitors’ machines are also discussed. This booklet is useful no matter what brand of metal detector you use. pdf download 29 pages You can find this and many more useful free books on this website at the Metal Detecting & Prospecting Library 8 Link to comment Share on other sites More sharing options...
Rick K - First Member Posted February 20, 2014 Share Posted February 20, 2014 Dave Johnson is an extremely talented engineer and a pretty amazing guy. Here's a quote from him that I found on a site where he posts non-metal detecting stuff, the quote however is about his philosophy of engineering - and life. "Our engineering dept at work has the equivalent of 3 engineers doing consumer product metal detector design work. We arguably outproduce the rest of the entire industry, because our philosophy is "screw up as fast as you can, and always stumble forward". Our challenge is never "but what if we make a mistake?" " 3 Link to comment Share on other sites More sharing options...
Steve Herschbach Posted February 20, 2014 Author Share Posted February 20, 2014 From Interview with Dave Johnson at http://www.fisherlab.com/hobby/davejohnson/Interview%20with%20David%20Johnson.pdf Many of the people reading this interview unknowingly own products of your design. Would you mind listing them? My first metal detector (in 1971) was a portable experimental vehicle detector for use on roadway loops. It discriminated between cars and trucks, but to become a practical product would have required a lot of development and nobody was interested in investing in it. Fisher in California: 1260, 1220, 1210, 1235, 1225, 1212, 1265, 1266, CZ6, CZ5, CZ20, original Gold Bug, Gold Bug II, Gemini, and industrial instruments including TW6, FX3, XLT-16, PF-18, and circuitry of the TW-770. Tesoro: Diablo MicroMax, Lobo SuperTraq. White's: GMT, MXT, analog circuitry of DFX, Beach Hunter and PCL-600 line tracer. Troy: X-5 and X-3. FTP Bounty Hunter: major revisions to existing platforms most of which originated with George Payne. The BH Junior, Platinum, Gold and security wand (sold under various trademarks) were new designs. FTP Teknetics: T2, Alpha, Delta, Gamma, Omega, G2. FTP Fisher: F2, F4, F5, F75, F70, new Gold Bug, circuitry of the TW-82 industrial line tracer. In the case of microprocessor-driven FTP products, the software was coded by John Gardiner and Jorge Anton Saad. Mechanical designs were done mostly by other people, but I engineered the ergonomics of the T2 mechanical design, which is also used on the F75. See also Detector Stuff Interviews FT-Fisher Engineers, David Johnson and John Gardiner at http://detectorstuff.com/detector-stuff-interviews-ft-fisher-engineers-david-johnson-and-john-gardiner/ More Dave Johnson Essays here Want people to know you own one of the Dave Johnson detectors listed above? Just download and print the attached logo and apply to your detector! 1 1 Link to comment Share on other sites More sharing options...
flakmagnet Posted October 16, 2017 Share Posted October 16, 2017 One of the clearest, plainest and most down-to-earth booklets I've looked through. It is a pleasure to read and has a lot of valuable (even if it's a touch short on detail), information on geology and the science of detecting. Thanks for letting us have a look Steve. Link to comment Share on other sites More sharing options...
Mark Gillespie Posted October 16, 2017 Share Posted October 16, 2017 Love the information in the book. A lot to take into consideration before heading out. Link to comment Share on other sites More sharing options...
delnorter Posted October 17, 2017 Share Posted October 17, 2017 Great thread with a lot of helpful information Steve. Thank you, Mike Link to comment Share on other sites More sharing options...
Steve Herschbach Posted May 24, 2018 Author Share Posted May 24, 2018 Gotta bump this to the top every year or so..... 2 1 Link to comment Share on other sites More sharing options...
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