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ENGLISH: Testing Detech 12.5″ DD and 15″ DD “Ultimate” coils for Minelab SD, GP, GPX Series

Original article by Mirco Salmi – © 2017 Smart Metal Detecting – Published on AMDTT.IT with authorization.
(Editing and translation by Leonardo Ciocca © 2018 AMD Tech Team)

Hello my fellow detectorists! I’m here to talk about two brand new coils made by Bulgarian Detech for Minelab detectors Series SD, GP and GPX, that I will test on my Minelab GPX 4500: the 12.5” DD and the 15” DD “Ultimate”.

Before describing the coils, a short introduction about the machine I’ve used is almost mandatory. The Minelab GPX 4500 is a very sophisticated Pulse Induction metal detector, designed for gold prospecting in heavily mineralized soils. A true concentrate of Australian technology, born from the brilliant mind of physicist Bruce Candy, Minelab’s founder and Chief Designer.

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ENGLISH: New XP 9″ DD HF coil/detector – Simply AMAZING!!!

(c) 2017 by Leonardo Ciocca – AMD Tech Team

It’s being a few months since the french manufacturer XP has launched the new HF 9″ coil for its flagship detector, the DEUS. The french company, very kindly, has sent to me a complete unit (including a remote control, 9″ HF and 11″ Standard coils/detectors, a MI-6 pinpointer and a WS4 wireless headphone) updated to 4.0 firmware release, needed to use the new high frequency coil.

For everyone who was astonished by the article’s title “…coil/detector…”, I’ll go straighforward to the explanation of that expression.

For years, majority of metal detectorists (Deus owners or not) has had always considerated the its coils…just coils… but this is not completely true!

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credoddmdisplayFor a long time I’ve desired to put my hands on a Nexus metal detector. This English brand, on the market since 2004, was always tied to high power products. Previous generation of Nexus detectors’ users always confirmed this axiom, with special highlight on their detection depth capabilities. Alas, the same customers were sometimes disappointed about difficulty to control stability of those machines, especially on the field. We could indicate the Nexus detectors as “Throughbred Stallions” that need to be tamed with patience and perseverance. Mr. Georgi Chaushev, chief designer and Nexus CEO, that we will soon interview, ante up with a new generation of even more poweful metal detectors with innovative and very interesting features. Continue Reading

INTERNATIONAL-MODS: E^5BOOSTER, enhance your pinpointer performances with a simple click!

Foreword by Leonardo/”Bodhi3″

As announced some days ago (LINK) , Sergio/”Xergix”, AMDTT senior member and electronic expert, just sent me his article on the E^5Booster (read it ‘E to the 5th Power’ Booster) project. I’m so happy Sergio decided to share his intelligent idea with all the blog readers who, I have no doubts, will really appreciate his work. I want to thank Sergio again for his excellent work and also I would like to thank Mauro/”Mauroki” for the extra photos and bench and field tests of the prototypes Have a nice reading!

AMD Tech Team Director
MODS: Project E^5Booster to enhance handheld pinpointer performance.
Project and Article by Sergio/”Xergix”. (c) 2014 for AMDTT
Extra photos and tests by Mauro/”Mauroki”

1. Introduction


The official E^5Booster Logo

Its a well known “trick”, in the detecting scene, that moving a small coin or any other small metal object closer to the base of the probe (Note by Bodhi3: the probe is something like an antenna, and it’s the sensitive part of the pinpointer) of any handheld pinpointer, you will have a sort of performance boost, in detecting distance/depth, on inspected buried targets. You will easily find some videos on Youtube about this trick and I will give you some links in the ending appendix to this article.

From the electronics point of view, the explanation is quite easy: the little coin just “tunes” the probe that fundamentally is a coil with a ferrite core inside. As well as with old radios that could be tuned by manipulating a coil with a ferromagnetic core (ferrite), the pinpointer probe can be “tuned” by placing a piece of metal at the coils end, gaining sensitivity.

Leonardo/”Bodhi3” Tech Note

By placing a ferromagnetic core inside a coil, the emitted electromagnetic field will be amplified. This is due to the increased electric inductance, since it is proportional not only to the coil windings number but also to the ferrite core magnetic permeability that is much greater than the one measured with air core.

Schermata 03-2456743 alle 15.29.22In this formula we can see how inductance “L” is proportional to the windings number “N”, to the nucleus area “A”, to its length “l” and the forementioned core magnetic permeability (greek letter Mu). In simple words, the iron core increases the electric inductance that will produce a more intense electromagnetic field.

2. How E^5Booster works?

The E^5Booster essentially is a virtual small coin but, compared to this one, has the great advantage it can be “activated” by just pressing a small button without the need of moving it. This will allow to easily fix it on the pinpointer in a stable way without any mechanical moving parts. Fundamentally the E^5Booster is just a coil and a mini button that closes the circuit when pressed. Let’s try to explain the technical difference between the “coin-trick” and the “coil-with-a-button” booster. From an electronics point of view, a coin is essentially comparable to a closed coil and could strongly interfere with a LC circuit (L=Inductance, C=Capacitance) as the pinpointer probe, in the same way a ring could do. You can use a common ring instead of a coin and the result will be the same: if the coil is “open” (read “interrupted”) won’t interfere with the probe, but if we shortcircuit it with a switch button, we will transform the coil in a sort of ring that could be compared to a coin. Easy, isn’t it?

3. Let’s do it!

Everything we need to produce an E^5Booster is a coil and a switch button: the more convenient coil shape is the planar one, since it can be easily adapted to any surface, rounded as Garrett’s Propointer, Minelab’s ProFinder, White’s TRX or flat ones as with DTS Sherlock or White’s Bullseye II. The switch button should be as small as possible and I suggest to use a 0,25 mm electric wire to produce the coil. It could be varnished or insulated. The coil I’ve made has 5 windings but the number is not critical. In the first prototypes (see photos) I used a small matrix board but it wasn’t flexible enough to be applied to the pinpointer in the right way.

So I had the idea to use something flexible and I’ve placed the coil and the switch button on a floppy plastic strip taken from a blister envelope. But I wasn’t satisfied enough. So I’ve transfered the circuit on a self-adhesive neoprene strip and the result is a flexible E^5Booster that could be easily applied on any pinpointer.

4. Let’s take a look at it


This is a magnified pic of the swich button: you can buy even smaller ones but I had a lot of them at home… so I saved some money…

Primo prototipo fatto su scheda millefori

The first prototybe on a small matrix board


5. How to apply the E^Booster to your pinpointer

Applying the Booster is very easy: you just need to place it on the base of the probe when the pinpointer is turned on. Then you slowly move it along the probe (toward its tip) keeping the switch button pressed until the pinpointer will start to beep. Then you just slightly move it back until the pinpointer beep won’t stop. That is the correct position!

You can now fix it with an adhesive tape (just the coil area, leave the miniswitch uncovered).

The E^5Booster, when the switch button is pressed, will almost allow to double the pinpointer sensitivity. I’ve, together with many friends, have done many tests on different models having really brilliant performances. Obviously, if you have a cheap pinpointer that can only detect things that are very very close (some cannot detect coins over 1 cm away!) the E^5Booster will maybe allow you to extend the sensitivity to 2 cm, but on good models that are able to detect a coin 3-4 cm away, the results will be amazing!

And think about it… No batteries…No special electronics…and soooo cheap and easy to be made!


Addendum by Mauro/”Mauroki”



Yesterday, during a hunt with my Spectra V3i, I had the chance to test the E^5Booster on the field on my Propointer. Its intuitive and easy use will enhance the already great performance of the Garrett pinpointer. You just need to press the mini-switch to detect targets at greater depths well over the original capability.


PRO: E^5Booster will almost double your pinpointer performance

CONS: If not correcty fixed or protected from moisture and mud, this tiny circuit could be easily lost or have some malfunctions.

I think the perfect solutions could be, and I know that Sergio is already working at it, to have the E^5Booster in a neoprene ring that could be fitted around the Propointer, with a well protected and waterproofed mini-switch. Mmmm… I think manufacturers should work on it. Don’t you agree?


Some international videos on the pinpointer “trick”: https://www.youtube.com/watch?v=X0tpCEEcNHE https://www.youtube.com/watch?v=5NwKFql01Wg

BOOK: Andy Sabisch’s “The Deus Handbook” (INTERNATIONAL EDITION)

by Leonardo/”Bodhi3”

Before leaving you to the very interesting article written, in cooperation, by Gianni and Sergio, (once again, I’d like to thank them for their precious work), please allow me to add a brief personal note. I would like to give my personal gratitude, and also from the entire AMD Tech Team, to the XP Detectors and its owner and chief designer, Alain Loubet, that I was happy to interview some weeks ago, who kindly sent us two copies of the handbook.

Andy Sabisch is truly a “celebrity” in the international metal detecting scene. With so many years spent on the fields and on the beaches of the entire Planet, gaining an incredible hunting experience and, obviously, quite a lot of buried treasures, Andy is one of the greatest metal detecting experts and, without any doubt, between the best popularizers of this wonderful hobby. I already had the pleasure to read one of his most famous books “The Minelab E-TRAC and Explorer Handbook” where he explained, with simple words, how to get the most out of those two awesome machines. With a simple and plain language Andy is able to introduce complex concepts helping the readers to deeply understand the detectors’ dynamics in order to obtain the best performances for any kind of field of application.
After the Minelab machines, Andy “fell in love” with the XP’s jewel: the Deus. With a rigorous detail level, Mr. Sabisch presented us a truly valuable handbook so rich in information, so incredibly useful for the beginners and the experts too. I would like to highlight the manual is very updated too, since it talks about even 3.x software realease features  but never forgetting 2.x ones.

In short, a very useful book, written in a simple and flowing english that any Deus owner, who wants to push its performance to the limits, should have on his library.

* * *

BOOK: Andy Sabisch’s “The Deus Handbook”

by Gianni/”Linux-Ubuntu” and Sergio/”Xergix”

The Andy Sabisch’s book arrived in a classic package envelope.  As soon I pulled it out, I was surprised by its size: I was expecting a tiny booklet with some “easy tricks from the detecting guru” but I was amazed to have a true 188-pages full-size-full-quality manual. The book is A4 size with a very nice and thick color cover, while inside images and graphs are in B&W. The print quality is superb, the font is perfectly readable and the image quality is really good. In short, even if it’s not printed on the best paper quality and is in B&W, it looks great and it’s very pleasant to read.

The book is written in English but it is very easy to understand even for foreign readers with enough technical English language skills. Its structure follows the one of any other Sabisch’s books, following a precise track, allowing the reader to “meet the manufacturers”, i.e. talking about the XP Detectors history, leading him to learn the detector parts, its first use and describing its advanced uses and search techniques.

In the first pages, there’s a special memorial dedication to Jogn Burke, a very famous british detectorist died in 2011, very well know as “John Lynn-The Norfolk Wolf” that probably most of your will remember for his website or his famous videotests.
In the following pages you will find a complete index and Andy’s personal thanks to several treasure hunters who gave a contribution to the book. So you will easily understand that all these contributions, together with Andy’s experiences, will have a very important and organic function in this rich and well organized book.

Andy Sabisch

Andy Sabisch

After the first introductory section, you’ll read a technical description of the XP Deus, its technology, the updating features and some very interesting paragraphs about its different operating frequencies put in relation with different targets. Those are basic and fundamental informations to start seriously learning how to use the machine at its best.
A complete description of each Deus software menu will follow. An absent-minded reader could think these page are a useless duplicate of the user guide that comes with the machine. Wrong! Each single menu item is extremely detailed and there are tons of intelligent tips. And it’s such a pleasant surprise to notice that the book is so updated, since it also contains the differences between 2.x and 3.x software release. Great job Andy!

We’ve really appreciated the section about the most interesting parameters, so difficult do be understood by beginners: Reactivity, Iron Volume, TX Power, Silencer etc.. All that stuff you MUST understand very well in order to push the detector to the limits. A very in-depth analysis of the “hidden menus” is also present (Sergio already published a very interesting article in Italian for our blog… here), with over 5 pages and several images.

Then Andy gives us some technical notions about concentric and DD coils, talks about the correct use of the pinpointer and finally bring us to the “Test Garden” and gives us very good informations on discrimination.

A very comprehensive space is dedicated to this last issue. Every issue, every parameter that is tied to discrimination is examined to fully explore audio and visual discrimination including Reactivity and Silencer.

As you’ve already got, the book follows a very precise organization, trying to unveil all the Deus’ secrets, from ABC to its most advanced features. Andy will go along with you from the beginning, helping you to discover the most proper techniques to have a succesful hunting in a variety of situation: from learning how to set the machine on “trashy” fields to how to recognize a hot rock, a iron object or any other “trash” target. A very wide number of pages are dedicated to discrimination techniques, very useful in place like parks and beaches.



In the book you will find several “tuned” programs for coin hunting. Be aware that Andy talks about USA coins, so you may need to tweak them a little to adapt the settings to your Country’s coinage. Andy and his friends also dedicated a lot of time to beach and fresh water hunting, to relics, and gold prospecting too!

Each technique will be illustrated with tips, specific settings, technical explanations and every other possible useful information. Obviously we recommend to think to these settings as a “building block” to create your own personal ones that will fit to your needings.

The handbook also includes sections about incredible  findings, Deus accessories, links and other useful resources.

Andy’s book is the ideal complementary manual to the XP user guide; Some times manufacturers’ user guides are not so clear or pleasant to read. This one will give you a great help to understand the XP one too!!!



A tip from us… Read Andy’s book several times and you will be aware that those “dark concepts”, slowly and easily, will become clearer and clearer and you will be able to master the detector at its best!

In conclusion, we really enjoyed ourself reading this handbook! It was a real pleasure because there’s always something to be learned from other people’s experience. Its a book for everyone, from beginners to experts. Reading will easily flow and will be very fun since Sabisch’s ability to melt his experience to other people’s contribution is legendary. It’s a truly useful help for anyone who wants to learn how to use the machine and it could also be used as a reference guide to refresh some difficult aspects and issues from time to time..

For more information or to buy the book:

 (Translation from Italian: Leonardo/”Bodhi3″)

INTERNATIONAL: AMDTT goes… Scottish!!!

Schermata 09-2456541 alle 10.34.16Con  un po’ si sincera ed autentica emozione, vorrei condividere con tutti voi la soddisfazione di vedere il mio primo articolo pubblicato in una rivista straniera.

La rivista scozzese “Up Yer Kilt“, dedicata al metal detecting, che vanta un vastissimo pubblico, ha pubblicato il mio articolo sui “10 Miti del Metal Detecting“.

L’articolo, scritto prima in italiano e poi tradotto in inglese, è stato inserito nel numero 12 (Agosto 2013) ed è scaricabile gratuitamente nel loro sito:


Ringrazio ovviamente l’Editore Mr. Shug e tutto lo staff.

AMD Tech Team

Exclusive Interview with Carl Moreland (Engineering Manager – White’s Electronics)

Carl Moreland

Carl Moreland

After interviewing him together with George Overton, as co-author of the book “INSIDE THE METAL DETECTOR” (click HERE to read the interview), we’re again with one of the most famous key figure of the international metal detecting scene: Carl Moreland (CM in the text).

Carl, White’s Electronics’ Engineering Manager, is also known to have founded (and he still administrate it together with George Overton) a site called GEOTECH1.com where everyday thousands of detecting electronics enthusiasts, self-constructors and simple tech-curious people meet and share informations.

In the interview, I’m sure you will notice that some of my questions were already asked to Eng. Kanev from Detech and Steve Moore from Garrett. My will was to obtain personal answers to common questions on most popular issues, that’s all…

Before leaving you to the interview, I’d like to thank again Carl for his kindness and also Massimo/”Gladiatore” for helping me with the translations for the Italian edition of the article.

Director AMDTT


LC: Hello Carl! Thanks for making you availble for this interview. Can you tell us something about your previous academic and professional experiences and how you’ve got in contact with White’s Electronics?

CM: Master’s/EE Florida State University; 18 years with Analog Devices designing IC’s for high speed ADCs, opamps, and GSM communications; 3 years with Maxim designing reference systems for cellular and ultrasound; I answered an employment ad for White’s.

LC:  As far as we know, White’s main factory is based in Sweet Home, Oregon, USA. Do the Inverness’ plant also partecipate to the development and design of new models?

Schermata 2013-06-27 alle 10.38.22CM: Sweet Home consults Inverness on new product designs, and Inverness does some designs independent of the Sweet Home facility.

LC: White’s models were always considered the best  detectors for discrimination. Is this feature a real fundamental topic in your design strategy or is just a “side-effect” of your ordinary engineering process when developing a detector?

CM: It is definitely a primary concern in our design process. We recognize that all the easy targets are gone, and what is left is largely hidden amongst buried trash.

LC: A lot of our readers asked us if White’s will introduce a  new submersible VLF multi-frequency machine. Are you planning something like a (Salt)WaterProof Spectra V3i, in the near future?

CM: I can’t comment specifically on current projects, but we are working on both new packaging and new circuitry that will combine to make some nice products. I can say that our traditional metal boxes are at the end of the line.

LC: When the Spectra V3i model came out, we Italians felt a little bit disappointed for the lack of Italian language in the menus. Will the next-generation machine include more languages and Italian too?

Carl with one of the V3 prototype (once called Vision)

Carl with one of the V3 prototype (once called Vision)

CM: Italian barely missed the cut, mainly because of time and memory limitations. But, yes, we are going to work on broadening our appeal through better language support.

LC: I’m asking to different engineers from major detector manufacturer if they think that current models, based on technology like VLF and Pulse Induction, are actually reaching their theoretical limits. Do you think there’s some more to be done on that before switching to a different technology?

CM: Single-frequency VLF is hitting practical depth limitations. Multi-frequency still has quite a bit of life left in it, especially in the realm of better signal processing for ground rejection and target ID. PI has barely gotten started.

A curious pic of a red box of the Vision prototype

A curious pic of a red box of the Vision prototype

LC: Latest top-of-the-line metal detectors are now featuring USB connections that allow easy firmware updates. Will the next models introduce this valuable feature?

CM: I would expect graphical interface models to have this feature. It’s a bit more difficult to do with units that have a segmented display, or no display at all.

LC: Will we ever see an “Open Source” detector made by White’s, where the internal software could be modified, enhanced and uploaded by users, as it happens with Android smartphones?

Some White's coils

Some White’s coils

CM: The engineering resources required to make this work well is probably beyond what White’s can provide.  Any given Smartphone has a massive design team behind it, with a multi-million dollar budget and expected sales of a $billion or more. We’re not in that league. However, we may implement a subset, such as the ability to load in a language module, including a language module that is authored by an independent developer.

LC: Recently some specialized companies produced man operated hybrid machines Metal Detector+Ground Penetrating Radar (GPR), that are now used in military or humanitarian demining. Do you actually think they could fall into the hobbyist market with some low-end versions? Are you working on that too?

The interviewer, Leonardo/"Bodhi3"

The interviewer, Leonardo/”Bodhi3″

CM: I doubt it. GPR isn’t the panacea some people envision it to be. Everyone would like to be able to read the date on a coin before they dig it up, but GPR can’t really tell the difference between a coin and a rock. We’re a long, long way from any kind of consumer-level  imaging detector.

LC: What are White’s immedate future plans? What we should expect from you in the near future?

CM: Hmmm…. new detector models! But seriously, I can only pass along vague generalities… we are engaged in a variety of technolgies including single frequency, multi-frequency, and some pretty advanced time-domain methods.

LC: Thank you very much Carl! It was such a pleasure to host you on our blog!

CM: My pleasure!

INTERNATIONAL: Garrett EuroACE VS Garrett ACE 250… The Final Battle!

Since a while I was thinking about a comparison test with entry-level detectors that could be useful to beginner treasure hunters and, why not, even seasoned ones.

The Garrett ACE 250, a true worldwide best seller!

If we stop for a while to meditate on that, it will seem obvious to everyone that people who need more detailed, coherent, solid and possibly unbiased information are beginner metal detectorists. Now, if you think about the kind of detector that 99% of beginners start using, you will naturally point out entry-level or medium-low level machines. For many years Garrett was almost the undisputed leader of this market sector, at least in Italy, with its Garrett ACE 250. If we could ask to 100 Italian hunters which was their first detector, I firmly believe that at least 80 of them will reply “GARRETT ACE 250!” Continue Reading