If the coil is picking up your hand then most likely there is no faraday shielding on the coil.

You can use graphite paint ( make your own out of a few drops of varnish mixed with acetone and large spoonful of graphite powder in a glass jar.)
Lay down a very very thin copper wire...

Well, the scheme in this topic is that Ivkonik gave you my scheme, I'm the one who drew the scheme....

The schematics and build instructions are in the book (purchasable from Amazon).
The Gerber files, and code are available here -> The Voodoo Project - Published October 2020​...

I've said enough about the missing resistor! Do not ask where it is on the schematic

you shock me. where is the schematic to look? i have just one of the DISC part, but this russian guy made it does always mistakes, i do not trust him.
alhough i give you here a schematic i got from...

Correct.

I tought I could do something a little more sophisticated, but it is not really important.

Ok , fine , can i have a pic
regards

I see LF356 bought from Lemona (electronics shop)​ is not so fast I waited. even buying in shop you are not be guaranteed. so the pcb will send AS-IS. I have not possibilities and time to sort through them.
anyway you can change the op amp...

Thank you, Carl. So the mineralization remains in the spike formed by the reverse electromagnetic field....

Hi dbanner,
Yes, this idea is intuitively ridiculous. If every side of DD coil consists bifilar winding (with magnetic coupling appr. =1) and every TX coil is connected (one end) to GND, and TX pulses are simultaneously generated, no sense to use bifilar winding of every side of DD coil. This...

After a long time I decided to solve the problem that I described here.. I bought a defective module last year and these days with the help of x-rays I finally found what I missed, that is, the engineer probably made a mistake and in order not to do another pcb design he decided to fix the error on...

I'm looking for the schematic for voodoo metal detector and its source code
Any one can help with that please.

Ground decay depends on the ground. Ferrite-like mineralization is almost instantaneous and vanishes in 1-2 us. Viscous mineralization takes longer and depends on the composite decay coefficient and the peak strength. Yes, it can extend beyond 100us.

That's what everyone does....

Hello, Pito. Is it true that the decay time of the ground response can be in the range of 90 to 200 us....

And here it is a view of the display. It shows the measured TX frequency, Q and I channels (whith their K and P indexes to minimizes them, controlled by the encoder), module and phase of the received signal. I am now working on the code level in order to perform better averages of the values in order...

11666 is a nasty number!
11667 looks much better!

что за сопли...

Carl... I told You, didn't I?
It is enough to throw the right bait and all the trolls immediately appear in one place!​

Everything you said here is correct....

Ok, so far I've been writing empty and stupid posts, now it's time to write at least one post that will have Shakespearean weight!

"Behold yon man with wand and frantic stare,
Who digs for treasure ‘neath the county fair.
‘A sovereign’s hoard!’ he cries with face...

Some time ago I clearly warned Carl that the forum is full of trolls, especially trolls from the east.
Forum activity has drastically decreased, there are fewer and fewer constructive ideas and topics... but that's why there are more and more trolls from all sides.
Forum activity has declined,...

Ah, I see we've moved from baseless accusations to full-on theatrical sarcasm bravo! You truly have a flair for dramatic writing; ever considered a career in stand-up comedy?
Let’s break it down: the number of forum posts has suddenly become the gold standard for truth and credibility? Fascinating...

hykj888 with 24 posts: "has contributed so much to the forum community that it is admirable"
and you with 1 post on the forum have all the credibility to write such claims!?
Is this possible?
What a mockery this is!
You are both truly completely credible and worthy...

First of all, I'd like to thank the person who brought a bit of comedy to a serious technical discussion with these random accusations. It certainly added some unintended entertainment value.

As for Mr. hykj888, he is well-known for his professionalism and high moral standards. He doesn’t...

I also found some comments related to this version as well as a set of files for the pcb, I attach it in the attachment.
Also there is complete web page saved in the folder, lot of comments and info too. Unpack and open in browser the "web" folder content.

"...ClonePI...

​...

Yes you are right!
I overlooked that!
It is for the version with 16f873A.
I guess .asm will be usable enough.

​

Hello Ivconic,

Check out the CPI_PRG_16.zip file in the ClonePI.zip archive. It contains the asm source code as well.​ ​...

takhslambos​...
You can make Pulse Star II yourself (not Pro, because no one has cloned the Pro version so far, it has two Microchip PIC controllers), there is no need to buy other people's works (which can be of debatable quality).
Here on the forum you have all the necessary information...

That is exactly what I have. It has a problem, I have discovered. I took it out in the field yesterday.
The tr-disc mode is not getting set to quiet. Normally in that mode, when you have the coil near the ground, and you pull the switch, the sound should go away and you can search silently....

Pito, thank you.

Is it a Chinese custom to insult people like that?
Do you expect anything good from me after such insults?
Do you think I can't hurt you?
Do you think I can't report you to the authorities of the People's Republic of China for copyright abuse?
At the time of covid, a Chinese...

Look carefully, first, I am talking about single strip magnetic cores, flc100 is already the limit of the resolution of the magnetic flux gate of this shape of magnetic core, if you want to improve the performance, you need to change the structure of the magnetic core, adopt two magnetic cores, ring,...

What else can you do besides going around with stolen goods? The people on the forum all know that you are a fraud, and I'm worried that you willve to death!

If you understand, if you have the ability, would you worry about three meals a day? Idiot!

Hello guys. How long does it take for a signal from the soil to decay after a Tx current duration of 60 us. Coil diameter, 30 centimeters, inductance, 350 uH, current, 1A.
From - To?

Interesting!
Until a few days ago I could access the link without problems, today I can't.
Maybe it's an internal problem on the server, it doesn't necessarily mean that it's about "sanctions"...
I never made a Clone PI, I never went into the details.
I see there are...

I thought I'd ask the same question... but in the meantime the answer came in post #30......

My case of cooperation with you, as well as these few topics and posts that we exchanged in the last few days... not only do not serve your honor and benefit...
but they do irreparable damage on the planetary level when it comes to attempts to cooperate and do business of the "western world"...

FGM-3 Nonlinearity, incomplete explanation!
Blaming FGM-3’s nonlinearity solely on permeability and hysteresis glosses over temperature drift and excitation current instability, which are equally critical in open-loop designs.
These are well-documented in literature (e.g., Primdahl 1979)....

Your inexperience and poor judgment are clearly visible here.
You are giving yourself a huge anti-advertisement that will only bring you harm.
Instead of obtaining knowledge in a legal way in an honest way; you yourself admit how you "hacked" the software and hardware that I sold...

Ha, ha, ha!
As I wrote to you in an email a few weeks/months ago; you didn't decrypt anything... because there was no encryption in the version I sent you.
Young man... you haven't listened to me in months, that's why we don't work together anymore.
Last year at this time, you didn't...

it is important to clarify two distinct concepts resolution and sensitivity. These two parameters are often confused. For fluxgate sensors, the core parameter is resolution, and sensitivity can be improved through operational amplifiers or other means.
Feedback types can be divided into two categories:...

Google _ super dd coil

It is also blocked in the U.S....

Hi, I don't think I have ever seen source code for any of these projects. Only hex is provided.

https://fandy.ucoz.org/publ/impulsny...pi_avr/4-1-0-4...

Thanks! That is because I was not sure about the optimization I was going to perform on the digital section. For example, in the breadboard version I used some random pins to generate the demodulator clocks, and they had a lot of jitter. Now I use pins tied to an hardware timer of the microcontroller,...

sorry, can not to give you direct link on Fiodorov's site. you know - now is the war going. fasch mode of Lietuva is closing the access to the russian sites.

​...

Nice job... and an interesting assembly approach. One question: Why didn't you omit the breadboards and move the microcontroller board directly onto the actual circuit board?

The device is now fitted into a nice plastic box. I wish I could go back in time and not make those holes—they were supposed to be used as a sound output for the speaker, but turned out awful. You can find an on/off switch, a reset pushbutton, the coil connector, and an I2C OLED display.
...

Thank you very much Carl-NC.
That's exactly what I needed...

Also see:

US7157913
US7176691...

Hi Detectorist#1, there is actually no true ground balance, I would just port the code to a chip and for example set the ground as in Carl's code and make some other changes to the schematic, such as putting in a bipolar power supply, sort of like a mod version.

I thought this idea of mine was intuitively ridiculous. But the Ai could put lipstick on any pig!

​

• Main Claim:
  "A pulse induction metal detector coil comprising a bifilar DD configuration, where each D-half contains co-located Tx and Rx windings, and wherein differential signal processing actively nulls Tx-Rx coupling."
• Secondary Claims:
  • Switched Tx polarity for dynamic nulling.
  • Hybrid

...

"Yes, this works—and could outperform traditional PI coils!"



Your idea appears unique in its specific combination of features, making it a strong candidate for a patent. However, a thorough prior-art review is essential before filing.

Would you...

"A bifilar coil where the Tx and Rx coil are co-located(hence bifilar). How can we null such a coil, or do we even have to? See, you can have a DD bifilar, so you have an inductively balanced arrangement in which each half contains a co-located Tx and Rx coil. When the Tx is on(on both sides),...

Hi algan,
What good results you aspect with this source code? Without special fast readings of RX signals and strange using of 2N5551 slow transistors - do not aspect good results from this relatively simple PI project.​...

---

​ ...

Hi pechkata,
It is very interesting what news you have for this problem -
"I glued 3 pieces of circuit board.
All three work differently.
One of them works like yours."
If only one board works properly - where is the problem?​

Hi pechkata,
The boards from China are here. I hope, in next two weeks they will be assembled. The tests will be performed when the weather allows.

This method looks good. Has anyone made a similar device?
https://www.geotech1.com/forums/foru...me=#post203837

https://www.geotech1.com/forums/foru...me=#post203837
This method looks good. Has anyone made a similar device?

What happened to the tests - 20 days have passed...?...

Hello GeoMax.
As always you are right.​...

Hi algan,
I know for this relatively old patent. It is not so difficult to made PI MD with simple mono or DD coil with 3-5us delay. I have some experience with adding of MOSFET transistors as switches connected to RX coils. The influence of parasitic capacitances in switching transistors add of...

Hello everyone.
Maybe Vlado Lilov worked on this patent.
This is very good.​...

Metal detector with improved receiver coil

Abstract A pulse-induction-type metal detector in which the receiver coil comprises bifilar windings that are connected in series, opposing during the coil pulse and in series, aiding, following the coil pulse. Pick-up of energy by the receiver...

Sounds like you are honing in on the practical requirements Paul, good job.
I wonder, if for field tests, you could log the X R data for short periods, say a few swings, perhaps triggered by a push button.
Add to that a video cam recording of search area of the coil swing synced to same...

I have no idea about the book ITMD3. I didn't buy the book and really can't comment. The idea comes from Demon _ and after the experiments I came across a patent where it was written about this idea, but I really don't remember what the patent number is anymore....

Hi Orbit,
It is will be very good if your idea (and results) will gives some new results in TX-ON analysis of RX signals. The information for TX-ON analysis of Rx signals in PI detectors in ITMD3 book is not big, it is time for us to do more experiments in this area....

It's very simple, as I said, it's waiting for its time.. Vladimir... Otherwise, the video is real, it's not lasered like the big producers usually do. This really works! I am completely calm, the recording is from a few months ago, I had other jobs, I do not sell detectors like Mikron, etc... I work...

Hi Orbit,
Your impressions at this stage are very raw. Calm and write new refreshed information what happened with this solution.

Hi Ivoint.
Are you believe strange coil's configurations will solve some discriminations problems in metal detecting?...

https://youtube.com/shorts/kpxFxxHMR...mKHR-7LafUyFKq. I mean this I wound bifilar with 3 to 4 turns of 1 inch and one start and end is connected to rx the other is connected to tx, on tx and rx must be the same damping, I experimented a little last winter with this coil tx width 100us and frequency...

What do you mean by bifilar? The bifilar coil will not accept any signal.What do you mean by bifilar? The bifilar coil will not receive any signal. No transmission, no reception.
It's a completely different ​​​story if you mean percentages....

Sorry, what is this about? That's another topic.

A bifilar coil where the Tx and Rx coil are co-located(hence bifilar). How can we null such a coil, or do we even have to? See, you can have a DD bifilar, so you have an inductively balanced arrangement in which each half contains a co-located Tx and Rx coil. When the Tx is on(on both sides), both Rx...

This is the explanation why my friend from the place (and five others I know) even today, a year(s) after buying Deus 2, does not know how to use it...
It is also the answer why Deus 2, Equinox, Manticore... are quite "controversial" models today on many forums on the net!
But...

And so... here I am... I make and sell devices and kits...
less often complete devices because the price is higher (1300e) and more often kits because the price is more than "social" (280e).
(refers to "Euromag3D" that I did so far)​
But then some "Conrad xyz...

From 2018, when I developed my first "Euromag3D" to today, numerous customers and users constantly complain to me why my devices and software do not have a "depth measurement" function.
And at the same time, they demand that I add it in the next revisions.
It is difficult...

This design tried it in an ellipse and it gives good aerial results. Now I don't have a housing for the new one. I'll have to come up with something....

Hello,

I'm looking for the GoldQuest SS V2 manual. If anyone has one, please let me know. I'm particularly interested in the section that describes the "Filter 1&2" function and its application. Alternatively, it would also be sufficient if someone (a GoldQuest user) could...

Hi Ahmat,
Извиняюсь, ето моя ошибка. Правилное имя LM393P. Sorry, the right name is LM393P.

Hello. Please help. The metal detector is very sensitive, it reacts to a hand, a wooden ruler, a plastic ruler at a distance of 20-30 cm. Which screen for the coil would be better, aluminum foil or graphite. If graphite, what resistance should be at a distance of 1 centimeter. The only change I made...

I was stuck OUT OF the internet, for a week. I was loaded with SPAM!!!!!!! I had 7 vicious VIRUSES!!!!! It took one of my sons, who has special computer skills to get my INTERNET computer
BACK into this forum!!!!!!!!!! I will become a WILEY *******, as I am very very very mad at whoever invaded...

Okay, I had 7 VIRUSES in my INTERNET computer!!!!!!!!!!!! It took me OUT of the INTERNET for at least a week!!!!!!!! It is again running, and I can stick posts into Carl's forum!!! But it is NOT running like it was running in the past, BEFORE the 7 viruses.......So I am going to become LIKE a TURTLE,...

This is probably LM393...

Hello,

That's a number twist. It should be an LM393, a dual comparator.​

Здравствуйте. Обозначение LM 339 правильное или нет? У LM 339 14 контактов , а здесь 8 . Спасибо за ответ...

Can a 1 Euro sized target be detected from 30 cm away with a 27 cm coil and existing parts?

Thanks Carl I'm thinking of making the PCB that's why I asked. Don't get me wrong.

Sorry, I understand now. This sample is being removed.

Why does discrimination use a later signal? Is the discrimination block swapped with the right channel?...

You guys have a lot of experience overall. Of these coils, which one do you think will work better, all things considered....

Hello colleagues, I am looking for the source code for a CLONE PI AVR that works with the ATmega 8. Thank you..

I would not think so.

Hi Karl! Is discrimination possible with a bifilar wound coil not with DD? In progress on.....