These chips are pretty tough, were you able to measure the short on the chip after you removed it from the circuit board?

and whot you have on VP1 and on VP2...

Touche...

Inexperienced young man, let me teach you a useful life lesson!
I am known in close circles as a great admirer of female virtues!
Whenever I hear comments like:
"I prefer brunettes ... I prefer blondes ... I prefer dark skin ... I prefer skinny ... I prefer elegantly plump ......

Ah, but you see, Linux is only for those that realize its elegant efficiency and pinpoint precision vs the bloat and over complication of the Windows juggernaut.......

​...

U5 is a ADS8320 analog to digital converter.

...

My Whites MXT Tracker is faulty.
Looking for the error, I found a short circuit in a small integrated
circuit with 8 pins marked A20 58Z2. I did not find anywhere what it
is under that label. Can someone help me find out what kind of
integrat circuit is ? Thanks in advance....

Check out the new videos I uploaded to showcase the new program for the first time and demonstrate the difference between the Felezjoo and PulseMaserPI metal detectors.

I will also upload a sample of the new program, along with a short text that serves as a user menu.


...

Hi Algan,

If you place a joint order with your friend, you can save on shipping costs. Each additional PCB set is included at no extra shipping cost.​...

Okay. Thanks, my colleague and I should order from there....

Dear kt315,thank you very much for sending archieve file to me.
best regards....

Hi algan,
The project of the two PCBs is property of GeoMax. Only he sell the set of the two PCBs on eBay.
https://www.ebay.de/itm/128018846245...Bk9SR6SxzeGAaA​

Hi, Detectorist#1, do you sell boards for customers in Bulgaria to order from you? There was a colleague who wanted to contact you, if he could leave me a viber or phone number. Thank you.

I've used several different ECAD packages, including Easy-PC and DipTrace.
Now I exclusively use KiCad, and LTSpice for simulation. Not only is KiCad FOC, but it doesn't have any design size limitations and runs in Linux, unlike DipTrace.

Thanks Carl.

KiCad has come a long way and is now on par with a lot of "professional" level packages. What I really like about it is that it doesn't contain a lot of over complicated bloat like 'Altium' for instance.

Cheers......

hello to all, its been long time since this topic was active. does anybody have 2.0 firmware to upload. thanks...

Hi Carl,

I use DipTrace. It’s a very good program, but I’m quite disappointed with the software developer. Last year, I sent them a six-page A4 document containing bug reports and suggestions for simple productivity improvements. But guess what happened: no reply, no follow-up questions...

Schematics are done in Easy-PC (NumberOne.com). They used to sell Easy-Spice, which was a version of SIMetrix Spice, but it's been discontinued. I am actually in the process of switching to KiCad and LTSpice.

Hi Carl, what program are you using for simulation? It seems a bit prettier than LtSpice....

You can search on Google; first look for the C code for the metal detector—start with Pulse.c.

Hello everyone, I'd like to thank you all for your efforts... and I need the original text in C or any other language, not felezjoo.hex.

And fifth reason - Carl declared he now design only bipolar type of PI MD - follow the motto - "IN CARL WE TRUST"

Very nice pi detector ,good luck....

Hi pito,
The advantages of bipolar PI:
1. Eliminated 1/f noise of 1-st stage - possible use of more cheap IC
2. Eliminated influence of magnetic field of the Earth - no need of EFE samples - more simple control pulses
3. No need of sophisticated schematic for automatic moving...

and what is the advantage compared to not bipolar ?

Dear haylaz
you need to put LM709 ic because no equivalent for LM709 or need to modify OP amp part.

Dear haylaz
Here the PCB Layout of schematic...

Dear Geomax
I tested two mathod. But much better and stable for supply 18 volts of 4 pin 555 ic

For common progress with common efforts!

Bravo... ...

Thank you for explaining in such informative way...wish you always in good health ...

Thank you!!

After a lot of work, I’ve arrived at a setup that really works, though I still need to do some field testing. For now, I have to say that the high and low discrimination settings make a big difference.

I’ve finally managed to adjust it so that ferrous metals register at the low end...

Hi Op04,
This project uses ready DD coil, ready S-stick from Minelab and ready metal case from HAMMOND. All this is pointed to easy repeating of the project from people with relatively low experience in MD.
You want to design a detector for bigger and deeper targets. The DD coils aren't...

Hi Detectorist#1,

Thank's for the update, a powerful machine!
I have some question, since I need a high power version of this (big and deep target)
1. By using GPX5K DD coil, for both R32/63 to get more coil current using S mode, what is the lowest R possible?...

R53 is the only possibility I can see for a threshold adjust. "ARM" feeds the micro, which then drives the speaker.

​...

maybe Melbeta will give a light? her file.
​...

of course you did.
i thought you just misspell the original name.
I wonder if I am the only one or I will be the only one.
keep up the good work
​...

Hello,
This is video with "Air Test 1" of "Dual Tone Pulse Detector". The targets are 1x1inch Al piece from beer can, two types of coins and some Fe targets.
Next video will be with targets in the ground.
https://youtu.be/gE5glKX-htQ​

Hi everyone,

Since I've received a few direct questions regarding the Spectral-G4 development and the Series 0 / Founder Package, I wanted to share a quick update and clarify how the prototype batch is going to work.

1. What is Series 0?
Series 0 is a strictly limited...

Regarding the name, I’ve already changed it—in fact, I use "Felezjoo" or "PulseMaster" in the title, which I’ve already done—and finally, I fixed the error I was having; it was indeed the BS170.

And if you watch the video, you can see it’s called PulseMaster,...

Sabios just a thought.
You should name your version by a different name than “new version of the Felezjoo “
it will only create problems later on with builders that they will not be able to distinguish what is what.
Perhaps name it as Sabios-Felezjoo or what ever but please Don't...

Check with an oscilloscope if you have a signal at the gate of the IRF840. Have you checked the BS170 transistor that's connected to the IRF840? The problem might be there....

I was working on this new version, but I accidentally dropped it, and now there’s an annoying problem: it powers up fine, but as soon as I connect the coil, the voltage drops from 12V to 4.94V. I’ve already checked the IRF840 and the 4148 diodes, and they’re fine; also, the 7812 regulator gets...

Thank you for your reply, Emerson Paz.
My current detector performs at the same level as yours. To be honest, if it could reject hot rocks without losing depth, that would be really great....

Found 4 trimpots on the PCB after opening the detector up.

I picked up one of these older detectors in working condition. Would like to adjust the threshold down. I don't have and cannot find a schematic for the Land Star.
Does anyone know if there is an adjustment trimpot on the circuit board and or which one....

Yes, grounding it to the point where the iron is eliminated does result in a slight loss of range—I think that's normal. I'm using a TL064CN instead of the LT1114CN; I posted some videos on YouTube demonstrating how it works, though I'm indoors, so the gain is reduced due to the metal mesh in the...

Greetings, Emerson Paz. Thank you for your reply.
Based on my current tests, after your detector rejects hot rocks, does it still have good depth performance? In that condition, does the detector produce any chatter or vibrating noise?

I would also like to know: are you using...

I’ve just uploaded a new video to showcase the new program I’m finishing up; I should clarify that it’s still in the testing phase, but it’s coming along very well.

This version differs from the Felezjoo and VolcanoPI; it now includes improvements found in very few pulse induction...

Dear Asanka, I tried this PCB before, but unfortunately, I couldn't get the discrimination feature to work. I couldn't find an LM709; could that be the reason?...

Hello tuntunlin , sorry for the delay in replying; I’ve been very busy with work. I haven't tested the detector in the field yet—only on the bench. Since I built this unit specifically for use with the 11" Mono Commander coil, I reduced the pulse to 80µs and the frequency to 2650Hz,...

Yes. None of the components are critical as regards exact model numbers or tolerances, except the resistors which need to be 1%.
You will also need to choose one of the supported displays (2-line or 4-line LCD, SH1106 OLED, or TFT) and a suitable coil....

Which difference do you mean? I posted a PNG image file at one point, and a PDF of that PNG file at another; someone had asked for it because they couldn't open the DipTrace schematic. The only difference is the file format. Everything else is the same....

Thanks for helping me. Yes, those were some discrepancies I found between the book and the file. I already have the Arduinos. So, with the data I found for the various components, will the metal detector work?

​ Show. In picture

Show this as picture...

Hi Asanka,

Why do you think the connection at pin 4 is wrong? The connection pin 4 of the second 555 timer is there to synchronise the charge pump only.​...

Important Points​
Disconnect pin 4 of the second 555 timer circuit from its current (incorrect) connection and connect it to 18V.
Since excessive voltage can damage the circuit, supply power to the circuit via a 7818 regulator equipped with a heat sink.

Use only the version...

Dear haylaz0036
Here is the information you requested:
For the all-metal mode, set the variable resistor connected to the CD4013 to the 100k level.
The easiest way to achieve iron rejection is to remove the variable resistor and replace it with a 56k resistor or a 47k resistor [ if...

Hi.
A large part of this problem is solved by adding a 4.7V Zener diode in parallel with resistor R22, connecting the diode's anode to pin 1 of U3 and the diode's cathode to pin 2 of U3. Let us know how it goes.
I have attached the diagram with the modification....

Skema PCB metal detektor IDX pro 2 tone

Glad it solved, alright then

Edit:
I forgotten since you mention post #18 on another machine back then I have use IPW65R150CFD I was satisfy with it, I also try lower coss FET but less deep, there are still some mystery why some FET not suite...

The problem was related to the power supply. My TDI SL is powered by eight 1.5V batteries, and the detector I was building was powered by 12V, 3.6Ah lithium batteries. The batteries don't supply as much current as the lithium batteries, which is why the IRF740S was overheating. I ended up reducing the...

Hi Eduardo,

I wonder will you share this project?
there are two FQT7N10 in PSU part makes this up (FET not too hot)...

Yes.

​...

Hi, Carl-NC
I once tried to describe the process of EMF generation based on magnetization and conductivity using formulas, but I can't find them now. However, I do remember that one differential is sufficient for magnetization, while two are required for conductivity. That is, the dependence of...

I forgot about it
ps.
it is inconvenient to quote selected/highlighted part of text, manually i need to delete from all text not relevant info...

ground blanced ferrite ​...

ferrite, beer cap, cola tab, coin​...

Yes, and the combination of magnetic response and eddy response can send the hodograph all over the place. Bottle cap:
​...

Hi, Carl-NC
Specifically, this hysteresis causes the response from the iron target in the device's hodograph to become broader in phase than the response from the non-ferrous target when the sensor is moved over the target.

The phase response of ferrite depends on how much hysteresis is in the BH curve:

​

An ideal ferrite has no hysteresis and the loss angle is 0°. The hysteresis in a lossy ferrite will elevate the loss angle; the one shown might be 10-15° which is rather extreme for a ferrite....

Good

Could any of you help me out? I’m close to achieving great results, but I’m stuck on the discrimination aspect. I’m struggling with the ID values—it’s a bit confusing, and as I mentioned, I lack an oscilloscope to visualize the full sampling stages; the timing windows used for the Felezjoo...

I've looked over the Excel spreadsheet as carefully as I can, and it looks like you've covered everything except the Arduino processors.
I also notice that you found a couple of other issues. J11 is a 9-pin header, and J13 is a 4-pin header. These have now been added to the Errata list.

Polyurethane (PUR) outer jacket.
Multi strand strand inner core wire silver tinned (not single strand solid copper)
Mesh tinned outer shield

My source ran out about 8 years ago.
================================================== ==============
Found this place using...

Ferrite is a ferromagnetic material similar to iron. It generates a magnetic field due to its magnetizing properties. This magnetic component is the reactive component of the secondary field.
Energy is not wasted because, due to the dielectric properties of ferrite, no current flows through the...

this is for ferrite, 0.8 deg​...

...

Hi, pito
Not all ferrites are dielectrics, but it's possible to select a reference sample whose maximum phase shift corresponds to -90 degrees. I'm not aware of any other available samples that can set the phase coordinates to -90 degrees (or a closed loop representing 0 degrees ).

If you compress the Excel file as a rar or zip, then you can upload it....

It would be perfect. In the meantime, I had prepared this, if you have a way to check. Sorry for the display but I can't upload excel files Thanks....

Have you watched Asanka's videos? The discrimination works really well.

Thanks.
I don't have such a detailed BOM available, but if you give me a few days I'll see what I can generate....

Hello,

No, there is no PCB for this schematic. I created it solely for study purposes to get a better overview of the many variations circulating online. Also, please note the information in the bottom right corner of the schematic.
If you like, you can design a PCB and publish it...

I wonder if there is a PCB for this?

Dear Geomax, thank you very much. I wonder, what is the difference between this one and your other schema?

Here is the PDF...

...

Good morning, I'll attach the corrections to the book. Would it be possible to have the complete BOM so I can attach it to the online store that will supply me with the components? It should include detailed instructions on the component model, not a generic one like TL072 without a specific model,...

Dear Geomax, I was unable to open the file you provided; could you please send it as a PDF?...

Dear Asanka, the video is excellent. I tried this before but couldn't get the discrimination feature to work; after seeing this video, I want to try it again. I would really appreciate it if you could provide the links for the schematic/PCB layout I should use....

no problem, just finished my version
​...

Sorry, the image shows aluminum, not copper (I made a mistake). Copper would look similar to aluminum, only more elongated to the right, just over 64 µs. (I already mentioned this in Aziz's thread.)
Brass is completely impossible to identify, as it's an alloy of various metals and can be either...

Great! The coil looks like the original Gold Bug one—or is that made in China too?

post #26, can yoy show for aluminiun, brass, gold ?

Hello,

if anyone is interested in a Detech 15x12-inch SEF DD coil for this project and doesn't know where to get one: take a look here at eBay. The price of €170 is reasonable, the quality is really sollid and good. Shipping from Bulgaria was also fast, though it may depend on your location....

The Errata for the book is here ->
Arduino Nano VLF Metal Detector Project - Published January 2024​

If you have spotted any other parts missing or incorrect in the Component Parts List, then please elucidate so that these can be added to the Errata....

Hi algan,
Have only two problems to use this DD coil: now this product is "out of stock" and the price is 740 Euro. But no problem if you check the possibility to be used with "Dual Tone Pulse Detector".