Coil dd for ace. Making a DD-coil "for gold. Which is better: batteries or accumulators

Many diggers who use entry-level devices from Garrett (models Ace 150 and 250), after some time after buying their MD, come to the conclusion that they no longer have enough standard standard coil. It is understandable, with the usual configuration, ICQ 150/250 come with a 6 * 9 inch mono coil, if you bought the Pro version, then the coil will be a little cooler - 9 * 12. It's just a little bigger, but the principle of operation is the same. And after digging for a while, the diggers decide to slightly strengthen their device, upgrade it. And there is only one way to do this - it's buying a new, more powerful coil.

Yes, I myself a few seasons ago bought a more powerful coil for my grater 34, besides, DD at 10.5". cool "coil for your device. In this article we will look at search coils from Mars, which come in 4 versions.

And now we will analyze in more detail what kind of coils, what features, pros and cons. Well, let's watch a useful video, because I know how hard it is to collect information when you decide to upgrade your metal detector.

Mars Sniper Coil

Just a great search coil for trashy areas. The size of the coil is 6 * 10", the shape, as you can see in the figure, is not round, but elliptical, which of course is better. They are wider than the standard one and narrower, less clinging to bushes and other interference. The DD coil is the most important thing in this coil, if compare with stock coil.
The double coil "beats" with a blade, and not with a cone, like mono coils, which means it scans a larger volume of the earth. Very low weight of the coil - only 0.45 kg. Compared to other Mars reels, it is much lighter.
As you certainly already know, the coils of the "Sniper" series are not intended for quick survey of the territory, "snipers" are primarily for carefully knocking out a promising place already found, and most importantly - they are for small things. It is much easier to search for small objects with a sniper than with other, larger coils. The cost of Mars Sniper is 4000 rubles. It is suitable not only for ICQ 150-250 (), but also for the more advanced Ace 350 Evro. I recommend watching a video - an air test on a target, in order to understand how deeply this sniper "sees" targets.

Coil Mars Standard

As the name implies, this is a standard, even classic coil, which is suitable for all search locations. The DD coil, which means it is much cooler than the standard coil and is great for replacing the standard coil on your ICQ 250. It can be called standard primarily because of its size - 10", most standard coils of cooler metal detectors are equipped with 10" coils. This coil perfect for surveying a vast territory, as well as for places with an average degree of litter. If the place is heavily littered, then it will be difficult to work like this. The depth actually increases, compared to the standard percentage by 20-30, judging by the reviews of diggers. It weighs heavier " snipers" - 0.55 kg. The cost is also acceptable - 4500 rubles. In order to check out the detection depth, I suggest watching a video - air test of the Standard coil with the Ace 250 device.

Mars Tiger Coil

But this search coil is the most popular among owners of Ace series devices, because it has a more convenient shape and size. In fact, this is the best option for replacing a standard coil, you certainly can’t go wrong. The size is 12.5 by 9.5", the elliptical shape allows you to search as efficiently as possible. According to the developers, the detection efficiency and depth have increased by almost 2 times compared to the standard coil. Looking at such numbers, you involuntarily think about changing the standard coil. A lot of attention when choosing a coil, they pay attention to such an indicator as false signals. Here you can see that the larger the coil, the more false signals. The special design of the tiger allows you to minimize the number of false signals. Now, when you hit the roots, stems, twigs, the device will not emit " left" phantom signals. The mass of the coil is only 0.56 grams, which means that it will not create a load on the device. Compared with large coils, they noticeably load the metal detector and the wire will experience "tension", it may break. There are no such problems with the Tiger. Below - video test of this coil by air (on ICQ 350).

Mars Goliath Coil

The largest search coil in this series, 15 inches in size, which allows you to conduct a very high-speed search. The coil scans a much larger volume of land at a time, it is great for "reconnaissance" of the territory. Any plans to test a large field? Take the big "rudder" Goliath from Mars and break through huge territories in less time. And when you find a place where coins come across, it means that it is time to change the coil to a smaller one for the final finish of the territory. This is exactly how experienced treasure hunters work, in whose arsenal there are up to 4 types of coils for various search locations. Of course, buying a 15" coil for standard trips is not recommended, it is only for quickly surveying large areas. If you decide to change the standard coil on your ICQ 150-250, then I would recommend buying a Tiger coil, but the reviews of diggers also say so. Below video - air test of Mars Goliath on Ace 250.

In general, there are many things about Mars coils for metal detectors of the Ace series. positive feedback, first of all, they are compared with the equally famous Nel () search coils. Someone says that Nel is cooler, and someone that Mars. Until you try, you won't know. In the entire large army of owners of Garrett Ace detectors, there are also admirers of Nel and Mars coils. Both are good. There are a lot of videos in this article, I suggest you watch the crash test of the Mars coil, I immediately warn you, if you have weak nerves, then it’s better not to watch, because they test the coil for strength with very harsh methods. However, she survived, and this is about something and says. In general, if you have something to say, you have used not only regular coils, then do not be silent, say a few words in the comments, share your experience. Which reels do you think are the best?

1080 878 Search with metal detector Garrett ACE 250 http://website/wp-content/uploads/2013/11/cda775a0bad3-1259x1024.jpg 01.11.2013 23.03.2018

I decided to wind the coil "on gold". According to my calculations, this should be a small DD coil operating at twice the frequency. If the native coil on the ACE 250 gives about 6.5 kHz, then I will try to develop 11-12 kHz on the “homemade”.

Let's try to see at what frequency the ACE 250 is operating now:

Did so. I wound a test coil-probe. This is loudly said, because the winding took ... 10 seconds. Here it is:

There are only 5 turns in the test coil (I took one vein from the so-called "twisted pair"). The picture also shows a connecting cable (“twisted pair” 2 m long) and a connector (“jack” in green electrical tape) - it is needed to connect a test coil to a computer sound card. The connector/jack/plug contains two limiting diodes KD103, connected in anti-parallel, they are designed to protect the microphone input of the sound card from interference and overvoltage (according to the results of the first application, it turned out that diodes can be omitted, see below).

Next, I needed to turn my computer into a virtual laboratory for a while. I went to this site and took an oscilloscope and a frequency meter there - they are the first on the site, what they look like, now I will give it below.

I turned on the ACE 250 with a native 6.5x9 ″ coil and put the coil on a test probe coil, which, in turn, I connected to the computer’s sound card to the microphone input (i.e. I pulled out the sound cable coming from the webcam and plugged my own). On the screen of the virtual oscilloscope, I saw that the probe, despite its simplicity, catches the signal emitted by the ASEA. You can count in milliseconds exactly what frequency is generated by the ASI coil, but better install Wirth. frequency meter and look at it.

The virtual frequency meter showed a frequency of 6700 Hz.

conclusions: the test coil-probe is working, virtual devices also coped with their task. Judging by the waveform on the oscilloscope, the probe has sufficient sensitivity, in addition, we can conclude that protective diodes (KD103) are not needed: there is no signal overload on the oscillogram, although the probe was close to the emitting coil. The shown probe works even from the microphone input of the sound card, even from the linear one (I have it integrated into the motherboard).

We have devices. (I recently noticed that the shown virtual frequency meter could not work with WINDOWS7 (x64), so I advise you to use the Simple Audio Spectrum Analyzer virtual spectrum analyzer to measure the frequency. specan22 here from this site, the program also works under WINDOWS-10). Now you can move on to the practical part, namely: wind a small coil (one half of the future DD coil) and connect it to the generator part of the ASI circuit, reach a resonance of 12 kHz.
I wound this coil of wires from the "twisted pair".


There are 9 turns of this cable, devoid of an outer sheath, i.e. 9 x 8 = 72 turns, respectively, soldered "end-to-begin". I connect the output of the coil through a safety resistor of 1.1 Ohm to the contacts of the 1.4 connector (bought for 5 UAH). In order to prevent the ASI input from being excited, I temporarily solder a 10 Ohm resistor to contacts 2.3 (to which the Rx coil will be connected). Here is the schematic:

I plug the connector and turn on the ACE 250 - it beeped twice and turned on as usual, without noticing the change. The oscilloscope showed the presence of generation of the "new" Tx coil (the signal was taken with a test probe coil):

And the frequency meter showed the expected frequency:

The sound card was a little naughty - it didn’t want to recognize the test coil-probe as a microphone, I had to deceive it by soldering a 10 kOhm resistor and a 0.47 uF capacitor to the coil, see pictures:

I made the receiving coil for 11 x 8 = 88 turns (I found a “twisted pair” of a slightly thinner diameter, so the coils seem to be the same, although there are 22 more turns on Rx).

Now we have both halves of the DD-coil, let's check the possibility of "reducing" the coils.

I connected the Tx coil to the ACE 250 (see the previous message for starting the Tx coil from the ACE 250 generator), and connected a multimeter to the output of the Rx coil in the AC voltage measurement mode. By moving one coil relative to the other, it is easy to get three zeros after the decimal point on the receiving coil for alternating voltage, i.e. "reduction" of the coils is done without problems. I outlined the relative position on the underlying piece of paper in order to approximately transfer the configuration to the future “bed”.

The coils turned out to be “plump” - when they are round, they have a diameter of exactly 10 cm from edge to edge, they can easily be turned into ovals:

For the sake of beauty, I introduced a multimeter into the frame, but mixing with it does not work. However, if you remove the measuring device by 30 centimeters, then by mutual movement of the coils you can easily achieve “zeros” on the display (i.e., the unbalance is less than 0.001 V).
Finally, I will make a DD-coil on oval coils: the sensitivity will be lower than on round ones, but judging by even these pictures, the zone of “transmission” of the ground with oval coils is 50 percent larger.
The main estimates are made, soon - installation.

Do not think that I use cheap junk materials, in fact, the opposite is true - these are the best materials. The coils are made of wire in thick polyethylene insulation with a twist, which helps to reduce the interturn capacitance and, as a result, gives a high quality factor Q, which means a well-pronounced inductive effect and a large circulating current in the generator coil Tx, a high quality factor is also useful for the receiving coil Rx . Coils are "loose", i.e. there is no mechanical tension in the wire - this gives increased thermal stability. (When heated, polyethylene will “move”, where outward, where inward and the total area of ​​​​the coil will remain unchanged, which means L = const, R will change when heated, you won’t get away from the formulas, but it will change less than for simple coils, since initially there is no mechanical tension). There are other positive effects (for example, the absence of aging of the wire insulation due to magnetostriction - it is because of it that the varnish on ordinary winding wires wears out). The coils are wound without any tricks, in one minute, on an ordinary coffee can. It is also important that in the assembled structure, in addition to the wire, there will be no radio components (but remember entire boards with radio components and trimming resistors (!) In coils from "brands"). Even higher parameters can be obtained using a twisted-pair cable for computer networks, in which each core is made of stranded wire - but I did not find one for sale, and this one was just at hand.
Very modest expenses had to be incurred for the manufacture of a connecting cable (connector - 5 UAH, 4 pieces of stranded oxygen-free copper wire in fluoroplastic insulation and a silver-plated copper screen - 4 x 2 m. x 1 UAH = 8 UAH. The fifth wire, designed to connect the static shielding of the coil with the "ground" of the ASI unit - also in fluoroplastic insulation, stranded MGTF - 2 m x 1 UAH = UAH 2. Heat shrink tubes were only meter - another 4 UAH). As a result, the cable together with the connector cost 19 UAH.

The cable turns out to be the best of all possible (without exaggeration): each coil will be connected to the ACE 250 block with two shielded cables, the signal will not be launched through the shields, the “ground” connecting the “ground” of the ACE 250 block with the static shield of the DD-coil goes through a separate wire from pin 5 of the connector (see diagram). All wires of the connecting cable are MGTF. (A radio amateur will immediately notice that the "earth" is separated by a "spider" - thus, all the interference that came from the environment in different phases and amplitudes will be mutually subtracted at point 5 of the connector).
(For reference: all cabling of the spacecraft is done only wire MGTF).

So dug graphite came in handy))). It weighs 20 kilograms, apparently it is from an electrolysis bath, there are 3 holes on top for connecting a cable.

Both coils and the "bed" are shown here. The bed / slipway / substrate is fiberglass, 3 mm thick, mounting coils on it means that there will be no work from below the future DD coil - in fact: put Rx, Tx coils on the bed, bring it together, fix it with epoxy with fiberglass and EVERYTHING .

In the morning I went to the garden, sawed off a piece of graphite from my “super stash” and took further steps on the coil.

I took a 10 mm drill, drilled a hole and a little dispersed her in a cube of graphite, and the resulting powder collected. I wrapped the Rx coil with cotton thread to improve adhesion with PVA glue. I mixed the glue with graphite powder in a ratio of 50 to 50 and covered the Rx coil with this mixture. He put the smeared coil on the place intended for it on the “bed” and put it to dry. I will not smear the Tx coil with antistatic at all.

The Rx coil, covered yesterday with "anti-static" has dried up. Checked the resistance of the graphite screen:

I cut the screen (there is a red strip from the insulating tape) and took up the connecting cable.
After I made a connecting cable (stretched 4 shielded wires and one simple one into a heat shrink tube) and unsoldered everything (both coils and a shield wire, see the diagram above), then connecting the connector to the ACE 250 and making sure that everything works (the frequency dropped to 11 kHz), brought the coils to an unbalance of 1 mV and tested the DD-coil with a gold earring on the table in comparison with the native coil from ACE 250.
Outcome. For a buttoned gold earring, it became 17 cm, but it was 13, for an unbuttoned one: it became 7 cm, but it was 5. The longitudinal size of the “asina” coil 6.5x9 ″ is 22.5 cm, and mine, 5x5.8 ″ in size, is only 12 cm.
It is interesting that the scale of discrimination has shifted strongly in the field of ferrous metals (expanded), and starting from the USSR penny, it has remained the same and in its place, 5 kopecks. USSR and 50 kop.ukr. - they respond with “Belltone”, but the penny is Ukrainian. from stainless steel migrated one cell to the right (cell 2 of the scale). Pinpoint works. I also noticed that by 25 kop.ukr., 50 kop.ukr. and a nickel of the USSR, the chuyka, in comparison with the native coil, fell, and increased for gold, i.e. gold “bulged out” against the background of the walker, as it was intended.

If you click on the left frame - this is the first step in filling the coil with epoxy with fiberglass - you can see the removal of the "ground" from the screen. It is a bare copper wire, 10 cm long, in some places fused with a soldering iron into a graphite screen.

In the meantime, I repaired my native “Asina” coil, there were nicks, and with the remaining black putty (epoxy with SAMSUNG laser printer powder) I glued a pair of glass cloth patches onto the sensor. My baby is moving to the finish line, I will soon take him out for a walk and breathe in the sea air, though I didn’t guess something with epoxy - it dries slowly. Please note that the Rx and Tx coils were actually not impregnated with epoxy to the wires - this is intended - this is both weight saving, but the main thing is maintaining the highest electrical quality factor Q. We get an epoxy armor body with fiberglass, but the coils themselves are dry, The epoxy didn't get to them.

Below I give a comparison of the main parameters of the new home-made "coil for gold" and a small native coil from ASI (I show two screen specan22 programs).

The coil more or less turned out, after checking a new coil made on a nearby beach (it showed 10 cm per primer in the sand, which made me very happy), I immediately wanted to take a ride to the gorplyazh and run with it for real.


The first vacationers appeared on the city beach of Kerch, so I chose a quiet corner outside it. This place was surveyed a couple of days earlier with two coils (6.5x9″ and NEL Tornado), however, my homemade baby suddenly began to pull out USSR pennies and Ukrainian nickels. With Ukrainian nickels made of stainless steel, it was clear that earlier, if you turn off the first square of the discrimination scale, the device saw them, but did not sound them, because it considered them black metal, and the new coil operating at a frequency of 11 kHz “stretched” the left side of the metal scale (as at Ace 350 Euro) and began to squeak "color" on the stainless steel. But the USSR pennies really became an indicator of the quality of my coil, because some jumped out from a depth of 15 cm and were clearly missed by me earlier when I went with my native and “tornado” coils. Despite the small size, the coil showed a rather large coverage, similar to the usual one from the native Asev coil 6.5x9 ″ (on the central line, the coverage was 18 cm for a 10 kopeck coin lying on the surface of the sand), so I did not have to compact search steps.

Then I came across an openwork silver chain. I'm not sure that I could find it with my native Asev coil (I'll have to check).


Somewhere around here I found a silver chain.
I liked the sharp sound and sharp reaction to the target, which is probably typical for this type of coils.
The clouds began to thicken, a cold breeze blew, and in order not to get caught in the downpour, I drove home.

Modest findings made during testing. The gold medallion was raised two days earlier with the help of my own ACE coil, I show it because I also tested my “coil for gold” on it.

The frequency response of the coil is shown in comparison with other coils (practical screenshots specan22 program of some coils for ASI in comparison with this remake "coil for gold").

I started the article in December 2013, but the final test of the reaction of the coil to fine gold was carried out only at the beginning of June 2014 together with a friend.

And you can see this coil in comparison with the factory coils for ACE 250.

And the work of the coil on the beach in 2017 is shown.

— — — — — — — — — — — —

In March 2015, I received questions. In no way do I think that there are stupid questions, but I think that there are stupid answers.

Let's start with the first question.

1. Connecting the headphone jack to which pins, or does it matter?

Answer: doesn't matter. Solder the "jack", plug it into the input of the computer's sound card and the probe will begin to receive the frequencies emitted by the metal detector coils, and the computer, turned into an analyzer, will "figure it out" and show the frequency. a slightly different probe scheme and details of working in the program are given specan22.

2. How are the wires on the coils soldered? 8 in one or by colors with each other? How did you get 2 exits?

Answer:

This is the future emitting coil Tx (the second Rx coil will be made according to the same principle).

In the main text (see above), I write: “There are 9 turns of this cable, devoid of an outer sheath, i.e. 9 x 8 = 72 turns, respectively, soldered "end-to-begin".

Let's describe in more detail.

First, I wound 9 turns of cable on a coffee can (diameter, about the same as a liter glass jar), then removed the coil, grabbed it in four places with white electrical tape and began to unsolder. Those. before starting work on turning into a single coil of 72 turns, I had 8 separate coils of 9 turns each (or 8 "beginnings" and 8 "ends" lying opposite each other - I separated them with a conditional red line), which I had to connect in one coil.

Let's deal now with this particular picture of the coil, although it is not very good for demonstration.

We take the first “beginning” vein that comes across - I have a green vein (it dives into the coil in the upper half of all “beginnings” and is indicated by a red arrow), now we find this green vein among the “ends” from the bottom of the coil (i.e. our green vein made 9 turns and finally emerged among the “ends” - I also marked it with a red arrow) and this “end” of it is soldered to the “beginning” of any other vein (if you click on the frame and look closely, you can see that the end of the green vein is soldered with the beginning of some next vein and an insulating tube with an asterisk is put on the link). Then we look for the end of the second vein and connect it with the beginning of some third vein. We will have to do such operations, under the record, 7 times, i.e. make 7 strands of cable cores until the only “end” remains, which has nowhere to solder - in the picture it is a white vein with a green vein.

As a result, we get a single coil of 72 turns, in which the “beginning” is a green vein and the “end” is a white vein with a green vein.

Recently I saw this picture and took it to my site - this is how you need to connect the ends to get a single coil, it is clear that there are different colors of the beginning and end of the coil.

3. From the coil 2 outputs. Which one to solder on the connector? Or does it matter?

Answer: There are 2 outputs on each coil, in order to test the future Tx coil for frequency generation and measure it, the coil must be thrown to the pins 1, 4 of the connector, plug the connector into the ASYU. The finished coil will have ess-but 4 outputs, the wiring to the connector is shown in the text. For a long time it will not matter how the ends are soldered - you will already make the coil completely, you will already go to the beach to test (and do the finishing operation of mixing, as I recommend to the most inquisitive designers) and only then you will need to cross the ends on the connector and test the pinpointer in work with colored targets. In the literature, such a finishing operation is called "phasing" the coils. I don't need any devices, opponents cannot do without a separate generator, oscilloscope and other devices. A correctly phased sensor does not lead the pin away from the object, but clearly shows that the target lies at the intersection of the windings.

4. Does the resistor remain on the TX coil after being tested on a computer and assembled on a substrate?

Answer: No, I put this 1.1 Ohm resistor solely to estimate the frequency and not accidentally burn the ACE 250. There are no resistors, capacitors and nothing at all on the working coil, only the coils themselves.

5. How to properly test the resistance on a graphite screen? And why cut the graphite screen?

Answer:

The picture shows that I just pressed the probes to the graphite screen at opposite points of the coil, the device showed a resistance between the probes a little more than 1 kOhm - this is quite normal resistance. The screen will work fine even with a resistance of 10 kOhm. It is designed to allow colossal static charges of tens of thousands of volts to flow down to the “ground” of the MD, so the resistance of the shielding coating of the Rx coil is of no fundamental importance.

An annular cut is needed so that a closed loop (coil) in the form of a graphite screen does not form. Despite the rather large resistance of the screen, it seems to me that such a cut should be made. Different authors think differently. I got the most out of this coil at every step, so I made a cut in the screen so that the screen was by no means a closed COIL on this coil.

6. Is it worth it to cover the TX coil with a graphite screen?

Answer: I left the transmitting coil Tx without a screen. I think that the screen, at least a little, will reduce the signal that will be “pumped” into the ground. Further tests showed a neutral reaction to static electricity - i.e. indeed, it is enough to shield only the receiving coil Rx.

7. What are the dimensions of the coil lugs? What are they made of and what are they glued to? What is the cross on the substrate and how was it calculated?

Answer: It seemed to me that the ears should be attached directly to the bed / substrate and should not be mechanically connected to the coils. I prepared the seats on the ends of the bed and first glued these 2 ears to some kind of glue, and then reinforced with epoxy with fiberglass in the process of forming the entire coil. The ears are cut out of a PCB sheet, 0.5 cm thick. The distance between them is not standard for ACE 250. The ears are clearly visible if you click on the corresponding frames above. The lower rod elbow assembly is made from a "T" shaped garden hose splitter and cut to fit between the lugs with friction. The cross on the substrate means almost nothing, it was just clearly visible through the paper sheet on which I did the initial mixing of the coils and outlined their relative position.

8. Regarding the cable: did you shrink the heat shrink with a hair dryer? What and how was the cable attached to the coil? Well, the main question: HOW did you solder the cable? They just connected 4 outputs from the coils and soldered them to the connector, and what was the 5th cable attached to on the finished coil?

Answers: I heated the heat shrink tube over a conventional electric kitchen stove.

The cable simply drowned in layers of epoxy with fiberglass, and fixed on the coil.

My cable desoldering is better than in any factory or home-made coil. Now I will gradually explain why, although I will not describe the physics.

First, I will characterize the wire itself, which formed the basis of the connecting cable: I used 4 identical pieces of shielded MGTF wire and one piece of unshielded MGTF wire, they all have a length of 1.5 m. This is the best existing stranded wire (in my 24 very thin copper strands with a diameter of 0.08 mm, and its insulation can withstand the temperature of the soldering iron, since it is made of fluoroplastic; its shielding braid (sometimes I write just “screen”) is silver-plated copper, in short, it is an excellent “military” wire).

And secondly, let's turn to the wiring of the connecting cable, which is shown in the blue box. It can be seen that all shielded wires are prepared in the same way, as shown in the red box, namely: the left end has no shield terminal (only the wire itself), and the right end has a shield terminal, and all such shield terminals of the four wires are assembled at one point, marked with a circle. For complete clarity of perception, I’ll add that the cylinder in the red frame is the wire screen, and the signal wire itself passes inside the cylinder, as it is customary to designate on most diagrams in the world and ess, the wire is isolated from the shielding braid (screen), the insulator is a fluoroplastic film .

It remains only to deal with the fifth wire, which does not have a screen (but has insulation). Its left end is shown as such a “chicken foot” - in this place the wire has contact with the graphite coating of the Rx coil - the wire is bare and glued there (more precisely, melted with a soldering iron tip) at several points to the graphite screen. As tempting as it is to run this contact through any of the four wire shields (and many factory coils do this to save copper), I do this with a separate wire (and also of the highest quality).

What do we have as a result of soldering the connecting cable? - all ends of all coils are run through shielded wires, each in its own wire, all shielding braids of wires and the wire coming from the shielding shell of the Rx receiving coil are soldered at one point (and then connected through the 5th connector pin to the main "ground" on the MD board) .

The resulting homemade cable is wrapped with electrical tape along its entire length and then pulled through a heat shrink tube.

Theoretically, the parameters of the connecting cable can still be improved if not just shielded wires are used, but each of them is additionally insulated along the entire length (my wires had a bare shielding braid).

9. Could you tell us more about the mixing of coils? Interested in how to connect the tester if the plug and coils are soldered to the cable?

Answer: You need to measure (and nullify) the AC voltage at the output of the receiving coil Rx and preferably do this in the field. But first, everything needs to be tested on the table in order to make a drawing of the relative position of the coils, and make a bed / substrate according to the drawing.
Connector pins 1, 4 now go to the ASI block and from it the Tx coil starts to generate. The induction voltage is induced in the receiving coil Rx and when adjusting / reducing the coils, it should be minimized (to all zeros on the tester). Practically do this: do not touch the pins 1, 4, and completely unsolder the pins of the Rx coil from the pins 2, 3 of the connector and connect (solder the probes) the tester to these wires in the AC voltage measurement mode. After obtaining a "zero" voltage at the output of the Rx coil, sketch the relative position of the coils and cut out the bed / substrate based on the drawing. Then glue the Rx coil to it (it should already be in the graphite screen, and the screen is connected by a wire to pin 5 of the connector), now you can go to the beach to set “zero” as accurately as possible, taking into account the influence of the earth. (In ACE 250 there is no ground balance, it is set only once “according to average” at the factory, so by making a coil with pre-compensated ground effect, you will significantly improve the MD parameters set by the factory. “Ground roar”, by the way, is tens of times higher than the useful signal ).
In the field, you first need to find abs. a place clean from metal debris (the native coil will help you here), then put a new coil on the sand and conduct the “mixing”, as at home, on the table, i.e. connect the coil according to the method described above, carry out “reduction” to four zeros on the device, and after “reducing the coils”, fix their position on the substrate with glue. The tester must be kept away from the coil. Glue for fixing the final position of the coils should be used not plastic (it can “float” when the coil is used in the heat), but best of all of the “droplet” type, which is sold in small tubes. Upon arrival home, it will be possible to apply the first layer of epoxy with fiberglass.

The lower leg of the rod was made from suitable polyethylene tubing. This friction knee is put on an aluminum bar and has no other fastening elements. The ends of the elbow are reinforced with fiberglass epoxy.

And the last. If I started making this coil now, I would give a much larger allowance for the “bed”. What is wrong with the fact that she would meet all sorts of obstacles in the way of the coil? - then the coil (protruding edge of the bed / substrate) could literally dig sand.

All pictures are clickable.

The search coil from the standard set of Garrett ACE 250 is self-sufficient in itself, and for the first time easily covers the needs of the searcher. But there comes a time when you want to increase the depth of your metal detector. Depth and speed of tillage. And here for the owner of this detector, a new topic opens up, additional coils.

The Clader store has a very large selection of coils for metal detectors. Choice, by manufacturer: from branded coils Garrett, to third-party manufacturers Detech, Mars, Nel. In size: from high-precision Sniper coils to super deep coils that can squeeze out of any metal detector maximum depth detection. Overview, compatibility and all searchcoils for ACE 250.

The standard Garrett ACE 250 coil, which it comes with initially, has the features and capabilities that a standard coil should have. Excellent division of targets into their own group (metal discrimination, ACE 250 has 12 groups). The accuracy of the discriminator depends on how many holes you will dig in which there is a find that does not meet expectations. The metal detector coil is directly related to this accuracy.

Working at maximum sensitivity. With a standard ACE 250 coil, you can easily increase the maximum sensitivity of the metal detector, and at the same time you will maintain search stability, without false positives. Precise pinpointer. On a standard coil, the Garrett ACE 250 has one of the most accurate pinpointers, fine localization features for small targets. Using large coils on the Garrett ACE 250, you will understand this (blurred pinpoint, one of the disadvantages of large coils). And the weight of the coil, the standard ACE 250 coil, has a weight, one of the smallest. Such a gentle load not only preserves the integrity of the entire structure of the metal detector (from loosening), but also does not overload the hand.

Which coil is best for Garrett ACE 250? The choice of coil depends on the type of finds and the place you are going to go to with your Garrett ACE 250 metal detector. To increase the depth, of course, you need to use a large coil. Such an addition will not only increase the depth of target detection, but also significantly speed up the speed of surface treatment. But for beach searches with Garrett ACE 250, the size of the coil is not important, and a very large size will even interfere. On the beach, the finds are not deep, and often in sufficient concentration to hit several at the same time, under one pass of the coil. For beach detecting with a Garrett ACE 250, it is better to choose a medium-sized coil (up to 13 inches maximum), but with a DD type (Double-D, DD). It will allow you to gain an advantage on small targets, and gives some compensation for the influence of mineralization (for example, sea sand).

With all the advantages of large coils, the size has its drawbacks. For a large reel, the pinpoint works less accurately, and sometimes you can’t pick up a small coin from one kopeck. Large coils consume more power. A large coil is subject to external electrical interference, which can add false positives. With a large reel, the weight corresponds to the size. This affects the overall balance of the metal detector design, and hand fatigue (especially at the end of the search day).

The best solution for the Garrett ACE 250 is a combination of two coils. One ordinary, medium size, for example, the same standard Garrett ACE 250 coil. The second is a deep one, which is used specifically for deep search and quick reconnaissance of the area.

Garrett ACE 250 Coil Compatibility

Coils for Garrett ACE 250 are by default suitable for all series of Garrett ACE metal detectors. The same coil connector in the control unit of the metal detector, the same mount on the metal detector rod. Garrett ACE 250 coils are also suitable for Garrett ACE 150, Garrett ACE 350, Garrett Euro ACE metal detectors.

All coils for Garrett ACE 250

Clader store has the largest selection of coils for the Garrett ACE 250 metal detector. There are branded Garrett coils from the manufacturer. There are third party coils for Garrett ACE 250. Coils Detech, Bulgarian manufacturer. From our experience, Detech coils on Garrett ACE 250 are one of the preferred ones. Excellent workmanship and reliability in the field. Let's note the Detech coils especially. Stable operation of the coils, without false positives and maintaining the original compliance with the metal discrimination scale.

Cheaper coils for Garrett ACE 250, 3rd party Mars and Nel. Domestic coils for Garrett ACE 250 are most often bought for a cardinal increase in the depth of the metal detector.

1. We directly cooperate with Nel company! Direct deliveries, only certified goods with a proprietary two-year warranty!
2. Delivery to the cities of Russia by mail! Shipment in special secure packaging. Fast and reliable!
3. Return without problems! If the coil has retained its presentation and working properties - we return the money without any questions!

Coil 5th generation. Up to 50% more depth than standard instruments!

The NEL Tornado 12x13"" coil for Garrett ACE will delight all owners of "ICQ" with new features. Nel Tornado not only increases the detection depth by up to 50% compared to the standard coil (the new Tornado sensor is equipped with a built-in signal amplifier, which allows you to increase the detection range, both in the air and in the ground), but also provides better target discrimination at any depth .

The design of the coil is characterized by increased rigidity. Additional rigidity of the coil ribs increases the sensitivity of the sensor by reducing the level of interference and the number of phantom triggers. The device comes with a plastic cover. However, at favorable conditions search protection can be omitted, since the strength and quality of the coil compound allows this. The weight of the new Nel sensor for Garrett Ace is 560 grams. This is weight without protection. If you want to make it easier to work with a metal detector and extend the search time, protection can be omitted. Moreover, there is such a possibility, as we have already said above. Plus, the impact-resistant plastic from which the sensor housing is made is resistant to ultraviolet radiation. Overheating on a hot day Nel Tornado does not threaten. The coil is 100% waterproof. You can work with it in streams and not worry about the "health" of the sensor in a downpour.

Of the design features of the coil, it is worth noting the strong attachment of the device to the metal detector using rubber rings for better fixation, as well as an elastic pressure seal that provides reliable protection against moisture, dust and dirt. You don’t have to worry about the tightness of the sensor, the strength of its attachment to the rod and, as a result, the stability of its operation!

In conclusion, we say that all Nel coils undergo a mandatory test for the range and depth of target detection. Moreover, the tests are carried out exclusively in conditions close to the field.
We wish you great finds and offer to buy a NEL Tornado 12x13"" coil for Garrett ACE in our online store in Moscow!

More finds with the Nel Tornado reel in old places!

Test:

✓ By air for 5 kopecks of the USSR 1961 - 41 cm
✓ In the ground 2 kopecks of 1820 - 30 cm

Characteristics:

• Type: Double D
• Compatibility: Garrett Ace 150, 250, 350, Euro, 400F2, F4
• Size: 12x13 inches (30.5x33 cm)
• Weight: 560 g
• Additional protective coating for greater durability
• Waterproof: 100%
• Color: black/grey
• Warranty: 24 months

• Clean connectors with acetone, dichloroethane or other available solvent.
• Keep metal objects away from the working sensor
• Wrap the wire tightly around the rod, additionally fix in places of sagging with electrical tape
• Turn off the phone while working with the coil
• Install new batteries

What will you have in the kit:

DELIVERY in MOSCOW

Delivery of orders in Moscow is carried out daily, seven days a week, at a convenient time for you. With an order value of more than 10.000 rubles, delivery Free,
350 rub.

DELIVERY TIME in MOSCOW

PAYMENT OF ORDERS:

1. Cash courier. In Moscow, you can pay for your order in cash to the courier upon receipt.

2. Pickup in our Store: Metro Komsomolskaya, Kazansky railway station, Komsomolskaya square d2, Kazansky shopping center pavilion 24
Opening hours: Mon-Sun from 09.00 to 21.00 (Daily, seven days a week)

3. Prepayment to a Sberbank card

4. On credit: purchase in credit conditions

In all my detecting experience, I regret only one thing - I spent a lot of time searching with the Garrett 6.5x9 ACE PROformance coil. I lost not only time, the main thing I didn’t get the finds. But I was the first to hit some detect points, but I missed the chance.

Coil size

The best coil size for Garrett ACE is 13 inches. Sufficient depth, work at maximum sensitivity, stability. It is with such coils that you can be sure that you will not miss the main finds. Great universal size.

But working with 13 inches is possible only at points where the concentration of finds is below average. With increasing concentration, when there is a response at each stroke, it becomes impossible to work with such a coil. And what to do?

In such a situation, often diggers begin to desensitize. Naive... Do a simple test on any 13-15" coil, lower the Garrett ACE gain by half, take a small gold earring and check the depth. You will be greatly surprised. You may not even be able to see it at 1-2 cm. By lowering the sensitivity, you will only be left with signals from large finds.

Situations in which sensitivity is underestimated - the solution is to reduce the size of the coil. I know the Garrett ACE is a cheap metal detector and the price of an extra coil is noticeable. But if you're digging for real finds, this is the moment that will force you to buy new coils, or upgrade from a Garrett ACE to a higher class detector.

DD vs. Mono

For most search tasks in ordinary ground search, the DD coil is preferable. But do not think that it is DD that will multiply the finds of your Garrett ACE by two orders of magnitude. This is not the case, you have a cheap metal detector in your hands and it works accordingly.

The main thing

Tip #1 If you're walking around with a Garrett 6.5x9 ACE PROformance coil right now, consider adding more. Any, even 11 DD will be better. It is better not to sell the regular one, leave it in stock for littered places. It is not a fact that you will be able to fully work at such points with a standard coil. But it will definitely be better than 11-15 inch with reduced sensitivity.

Tip #2 Tie you with Garrett ACE. Everything you learned about him in the first week of detecting is his ceiling, he will never get better.