XP deus coil modification

[Funfinder]

Meanwhile for sure 100s of XP Deus are R.I.P. just because the coil battery died and
the users are NOT AT ALL interested to pay a lot of money for sending it somewhere
for replacement or try on their own to change this crap !!!

It was already a stupid idea in the first place to attach such a larger metal-object as a
battery so close to the coil togehter with PCB! *laugh*

So the only useful modification for these anyway to small XP coils is to
add some kind of battery-compartment for smaller outside chargeable
LiPo cells.

[Koala]

this is all I have ever seen


https://md-hunter.com/whats-inside-x...g-the-machine/


I haven't look at all the 15 pages on xp detectors

[ionut_mtb]

I built a 5 1/2" for the Bandido

I used it as my main coil for about a year

finds rates was about the same as my 10" coil

You cover less physical distance. But the actual area detected isn't that much less. Most field here have a scattering of horse shoes and ploughshare. The best I can detect on our tiny hammered coins with any coil is a distance of half the coil diameter. So the larger coil spends more time being blinded.


Depth wise on smaller than a UK pre decimal 1/2" penny is identical. I have a very thin half penny buried in my lawn at 10. Its a tough target but is detectable with the 5 1/2" The larger coils does go deeper on larger target. So yes you might miss a bronze age axe. But you aren't wasting time digging aluminium cans at 20"

It can of all averages out. One big plus of a small coil one fields that have already been done is how much closer you can get to metal fields.


I see the stock coil for the new Garrett Apex has a width of 6"

i understand what you are saying, you are right. I ask for schematic because i want to further experiment with wireless detector systems.

[Koala]

I built a 5 1/2" for the Bandido

I used it as my main coil for about a year

finds rates was about the same as my 10" coil

You cover less physical distance. But the actual area detected isn't that much less. Most field here have a scattering of horse shoes and ploughshare. The best I can detect on our tiny hammered coins with any coil is a distance of half the coil diameter. So the larger coil spends more time being blinded.


Depth wise on smaller than a UK pre decimal 1/2" penny is identical. I have a very thin half penny buried in my lawn at 10. Its a tough target but is detectable with the 5 1/2" The larger coils does go deeper on larger target. So yes you might miss a bronze age axe. But you aren't wasting time digging aluminium cans at 20"

It can of all averages out. One big plus of a small coil one fields that have already been done is how much closer you can get to metal fields.


I see the stock coil for the new Garrett Apex has a width of 6"

[ionut_mtb]

Hello, did someone traced coil pcb schematic?

[galushka]

Hi friends! There was a question about the correctness of my work, made the winding, measured the inductance all the same factory, but adequate response to the target is not! VDI shifted to the bottom, in some moments throws the coin into discrimination. As far as I understand I have shifted PHASES (do not respond video, as shown Henrikras ), please tell me how to change them, what a principled way

[Lavabo]

great post about the electronics of the XP coils.

It will help me in my repair job

[Henrikras]

Henrikas hello! You are doing a great and interesting work. Please make a measurement at the input of the operational amplifier (C3), the output of ТР1 and the seventh output amplifier. Interested gain coefficient. Thank you!

Smity... That not posible anymore. The PCB board is inside a plastic box and sealed. Sorry.

[smity]

Henrikas hello! You are doing a great and interesting work. Please make a measurement at the input of the operational amplifier (C3), the output of ТР1 and the seventh output amplifier. Interested gain coefficient. Thank you!

[Henrikras]

Thanks Skippy..
The articel by danskowski was new to me. Very Very Interesting and many "aha" and thats why.
I had my self a similar exsperience with the Viking silver coin hoard I found. First 3 coins came up (Shallow) and then it stop..no more signals only a lot of Iron. Then I startede to dig iron in the central area and no 4 coin came up.
I knew that there had to be more deeper down (or masked) but I couldn't find them, and I tryed 2-3 detectors and small coils. No succes. Only chance to find more was the hard way, taking dirt of cm by cm and dig ALL signals.
The 3 pictures showing a area I worked with. It was hard working but Big succes, "one" more coin came up.
It could had been masked or to deep, I dont know.
The end of story after the museum came in, and the hoard (spread one) was up some months later, it ended with 42 Coins.
This exsperience the summer 2015 was really a eye opener, to the subject IRON (or trash) is masking.
Okay masking depends the coin size or other finds, compaired to the iron close og just near. In my case those coins only was 20 mm and had the weight of 1 gram silver. That not much and properly the reason it was difficult.
ps. Sorry the pictures turns up side down or 90 degress.. I dont know how to turn them.

[Skippy]

DD coils do have their peculiarities (but even concentrics can lie). But....don't fall for that Garrett illustration, it's just marketing nonsence, DD coils DO NOT have this 'razor sharp beam' detection pattern.

Regarding iron masking: NASA-Tom Dankowski reckons iron masks up to 90% of targets, even a tiny piece of iron can blank out a significant area if it's shallow. He's written several articles about the subject, you may have seen them, but for everyone else:
http://www.dankowskidetectors.com/painful_truth.htm
http://www.dankowskidetectors.com/behindthemask.htm

Certainly digging iron is one solution. Digging weak iron is another. Weak iron is more likely to be non-iron than something that indicates as a definite iron signal. And if your search area has lots of tiny/small iron, it may be worth digging the larger iron signals, they may be non-iron.

[Henrikras]

I found this Garrett illustration... This negative detecting field was what I tryed to explain.

[Henrikras]

You right Skippy, the PCB was from a large coil, and I didn't dare to try some preamp modifireing..
But I would say that the round coil I made is working pretty good, but there is something negative about the Deus, I found out in my lastest test (masking test).. That is the Deus is Very sensitive close to the outer diameter of the coil (what is the right word, those Inductance close to the Windings) So no matter how fast you adjust your Deus, Iron close to the coil, will mask out goodies.
I did a test Deus vs my Makro Racer and the Racer won.. First some time after the test, I found out the reason..
And It didn't help with different coil size, factory og Home made. Same ****.
Im sure that this problem is seen or knowed, not only by Deus owners, but every one working with Detector like you, and many others.
it must allso been knowed that different models and makes, do react different close to windings. !

We need to remember that Henrik's PCB was from a large Deus coil, and he used it unmodified with his small coil. It could be that modifying the pre-amp gain ( I think it may need increasing, perhaps double the gain, initially) would help the small coil.

On the subject of 5 inch Fisher coils:
Until recently, this small coil for the F75 and the Teknetics T2 and several other First Texas machines was a vacuum-formed case, and has been around since the 1990's. They have recently changed to a proper injection moulded case. But there are many old Fisher coils out there, and if the price is right, they may be useful to home-builders. The case is a two-part design, upper and lower. The lower is 'dish' shaped, and fits over the upper, with a glue bond. I think it may be possible to seperate the two, so it can be re-used. Or a new lower case may be made, from ABS sheet.

[Skippy]

We need to remember that Henrik's PCB was from a large Deus coil, and he used it unmodified with his small coil. It could be that modifying the pre-amp gain ( I think it may need increasing, perhaps double the gain, initially) would help the small coil.

On the subject of 5 inch Fisher coils:
Until recently, this small coil for the F75 and the Teknetics T2 and several other First Texas machines was a vacuum-formed case, and has been around since the 1990's. They have recently changed to a proper injection moulded case. But there are many old Fisher coils out there, and if the price is right, they may be useful to home-builders. The case is a two-part design, upper and lower. The lower is 'dish' shaped, and fits over the upper, with a glue bond. I think it may be possible to seperate the two, so it can be re-used. Or a new lower case may be made, from ABS sheet.

[WM6]

Agree. Small coils are underestimated with no real reason.

Once I have Whites M6 detector equipped with 9.5" stock coil.
Then I buy 6" Excellerator intended for special occasions - as I am thinking.

Expecting 6" coil should be about 40% shallower than 9.5" coil

After repeating thorough tests on my testing plant, it came out, that those 6" coil is only 2cm shallower (at 30mm silver coin) than 9.5" coil (19cm in comparison to 21cm of depth).

Of course I abandoned 9.5" coil from my regular use and enjoy couple years in "lite" hunting with 6" coil.
9.5" then become coil for very rare special occasions.