Thank you.

Funny that those devious Swedes made the list.

Ha, ha, don't joke with me.
I'm sure you're using some kind of magic algorithm.
I'm really happy for you.
Greetings.​

I use it to measure the characteristics of FG3 and my own sensors. The tube is 50mm in diameter, the rest is based on a magnetometer....

Doh ... you figured out how I did it ! Now my patent is broken ... I will have to invent something else.
There goes the weekend.


...

thank you George and Grok.
some charlatans have cast a shadow on all of Lithuania and now everyone must suffer. i must say that there are bad people in every country, Lithuania is certainly no exception.
lithuanians on the recovery American M88 https://www.youtube.com/watch?v=zwpOKnOFj6...

Tex, set your flag in your profile. you will get answer more much faster if you in US, believe me now.

Bravo Moodz,
You are a real magician.
I am really glad of your success. I wish you always to be the best and do new and new things.​




Indeed, some PI detectors with very early first samples (most notably gold-seeking detectors) and fixed delays for GB samples...

Are these available to purchase?

Not to spoil this topic, fun here: https://www.geotech1.com/forums/foru...elmholtz-coils

...

I asked Grok, and here was the reply:

eBay has introduced high-risk policies for certain countries to enhance safety and trust within its marketplace, addressing specific challenges related to fraud, non-delivery, and regulatory compliance. These policies, such as restrictions on listing...

14,4V on one pic, 15V at another one.

Does anyone know the type of internal battery it takes? Thanks, Tex.

Thanks Modz! Yes, I assumed it was an algorithm! Of course, props like a hot ferrite rock are used for testing.. It's all very interesting, I've read Karl's patent several times, but as you say, something always slips by or we stick to predetermined rules, and the rules are there to be broken!

I know there are many types of "ground" .... the ground I was most interested in nulling out is ground with a high ferrite content and hotrocks ( aussie gold fields ).
A conductive ground ( seawater for example ) requires a different technique ( SAT in my case as the conductive ground...

Hi Modz! Turning off the ground without ground, if I understand it, implies that the balance point is determined in advance, and at that point the detector no longer needs to be adjusted on the ground?! But still adjust the operating point using hot rocks and ferrite?

Hi Eduardo, will you post the layout of your board?
To build your project. Thank you.​

After a couple of days slaving over a hot computer ... an Australian provisional patent is now lodged.

You may be interested to know that one of the principal prior art citations is your patent US 9285496 B1....

That's curious, I wouldn't think it would matter all that much. I've made monopolar designs that cancel hot rocks quite well.

Has anyone built this project. If so, did it work as expected?...

Thanks, Carl, for answering my question.
I've noticed that ground balancing is more effective with the bipolar design than with the monopolar one. I have a highly mineralized stone, and the only detector capable of canceling it out is the bipolar one. The monopolar detectors I have aren't capable...

The bipolar TX has more parasitic capacitance than a mono TX so usually the sample delay cannot be as aggressive. This will limit the smallest nuggets you can see. On the other hand, bipolar can be run at much higher pulse rates than mono and this can improve integration gain, but this won't make up...

Hello Detectorist 1.
Thanks for the feedback. The black stone is very hot, and the other object is a piece of highly mineralized brick. If you bring a magnet close to it, it sticks. There's no need to touch the GEB potentiometer. I don't know if it's because the mineralization of the two objects...

the jumpers in epoxy layer are just for protection from pirates. no another aim. when the pirate deletes the black epoxy he breaks those thin copper wires, after he gets his full copy of board is not working.
in Pulse Star II Pro author used two PIC micros and did not use the black epoxy, no need....

Hi Detectorist! Let me understand what you're talking about! I also know that some expected exactly what I wrote... That's why I'm sorry for some who thought it would do the same.Again the translator does not translate realistically.. Let me understand that Smart uses an ib coil!...

Hi Orbit,
Yes, but you must have in mind that Smart Pulse Hybrid uses IB coils and this project uses more simple mono coil with very good results. The difference in the coils is very important for DIY projects.

In my PI-MD project with IB coil, I also use VCO for high-low tone for Fe/non-Fe targets discrimination and different threshold stage, but I'm not sure for GB capabilities of my design until the field tests.

Works great! But I think some people were still disappointed.. It was thought that it would be equal to Smart Pulse Hybrid or better than it.. Still needs work?!

Hi eduardo1979,
Congratulations for you and for Carl. How hot are the two stones in your youtube video? It is interesting - you not change the GB setting pot between waving of them.

1.2 n was in one of the units, in the other it was 1nf, that capacitor affects the width of the transmission pulse, nothing significant affects the operation! The device works with both 1nf and 1.2nf. You yourself made a mistake on the pcb and no one can help you but you! As someone said solder another...

The error has disappeared, as using a 4066 as a demodulator with its corresponding level translators worked perfectly. The VCO was also modified and replaced with a 4046. The Threshold stage was also modified. In any case, this is a project that can be further improved. For now, it detects a gold wedding...

Perfect Eduardo and you act quickly. Now can you tell me what the oscilloscope diagram is with your project? Is there still the bug that Carl showed in the video or is it gone? Can you make a clip of the oscilloscope? Thanks.​...

Which capacitor did you remove, I think you mean the 1.2n capacitor that is used for the 555 IC?...

Those who made it changed the resistor values ​​and changed some of the paths to make it work....

It seems to me that the translator translates rather poorly?

You simply cannot arrange something, buy it and not think! No one can help you if you're stubborn, you haven't broken a single pcb and you know it's not true, at least ten people have done the device, maybe even more, all of them work except for one person?!...

I know very well what I'm talking about, two original pcbs, I disassembled all the components, resistors, capacitors, and everything else is correct! The fact that someone does not know how to add 2+2 = 4 is already his problem!

Okay, I found the material, I had stored, regarding the Compass detector, that was during the time Jack Roach used his own designed metal detectors, to run them with the Compass, the Whites, the Garrett, and I know there
were more other brands then that he tested his with theirs.

...

difference...

Excellent Eduardo!
Dunno why Carl is "complaining", the detector works quite alright!
(Carl is too modest)

https://export.ebay.com/documents/16...egory-list.pdf

hello,

shocked... a country of NATO and EU is in a list of 'high risk category'. what's going on! now i can not sell simple things!


High-Risk Category Policy: Category Block in Certain HiPO Countries
Sell worldwide with eBayHigh-Risk Category Policy: Category Block...

Yes, you've said that many time, no need to keep repeating. It is now up to you to find the problems....

The resistor values ​​in the schematic are wrong and some of the wiring is incorrect....

Yes, that's right, I have to find the problem myself....

Joaquin Murrietta was an famous bandit located in historical California. Then he purportedly vanished, and from what I found in research,
he married a lady, and Murrietta and this lady, vanished in OLD MEXICO. When they got there, I believe they both changed their names,
and vanished and...

Jumpers are often required for 2-sided PCBs and usually are not included in the schematic. This is normal.

Repeating over and over that the schematic or PCB has errors is not going to solve your problem. Multiple people have said it works, so it's time to try a different path. Troubleshoot...

Hello everyone.
I've finally been able to finish the PI Bipolar detector. Everything works correctly, just as shown in the video. The sound is very similar to the GPX series. The Hi-Low discrimination is very good, as is the GEB.
https://www.youtube.com/@eduardofern...pez7868/shorts
...

Take a look at its behavior on this video. It shows how it works as today.



I am starting to encounter a few problems:

1. Temperature derating: the detector needs recalibration every 5minutes or so
2. Noise in the test room and presence of metal everywhere...

DISC board is filled by epoxy and that why it is invisible. the pcb is above on a photo and you have to see mark DISC PCB on it. ...

So these two jumpers are not drawn in the schematic, which means the schematic is not complete and has flaws....

Otherwise it is true that there are two jumpers in the epoxy resin! So it happens that the device when we put all the original components back on the pcb records without the included coil! With the coil on it works normally! The only thing that can be noticed is that the battery indicator needle shows...

I don't have a lot of time and I completely neglected the old 2 pulse, but anyone can rearrange the symbols on the diagram regarding the voltage, everything else is the same as on the pcb! With pcb, the symbols gnd + bat - etc can be properly marked!

This is not a reason for the device not to work! The scheme is not in order because it was important to me that it works for me, that's why there is also a comment in Serbian regarding the voltage, the rest is perfectly fine.

So no one has the complete schematic of it.

...

So even then the schematic is not complete....

PCB file. you need just to trace it and you will get the pcb. you do not go full way from a schematic, you do right just the pcb....

all value of the detector is a pcb of discrimination. but they do not do it because are not able accurately delete epoxy. on this board in epoxy layer are tiny wires like jumpers and every time they delete the epoxy they break them invisibility. so direct coping of the pcb brings nothing - pcb is not...

Yes, I've looked at the schematic, it's a mess. I have no idea if it is correct or not, but several people have said they built it and it works. If your board does not work then you have to troubleshoot it, no one here is going to be able to tell you what is wrong with it.

This is the schematic, Mr. Carl....

Yes, you are right, it is exactly like that....

Hello, thank you for your explanation, Yes, when I measure the negative voltage, it shows 11 volts negative instead of 10 volts negative!...

= Adjustable Voltage Regulator


​...

Here is the form that I made and it works and the circuit is there instead of REF25Z 2.5 V I use an analog LM385Z-2.5 also an analog in place of BUZ71 using IRF2807 you can use analogs that are at hand first turn on the power supply +12 is GND you must have +5 and -5 volts to the integrals opposite...

As the frequency increases you should also see the pulse width decrease. Because the relationship is non-linear, it actually burns less power at higher frequencies....

...or whoever drew this schematic was smoking something. Depends what you call ground reference but with a voltmeter from -12 ( AKA neg of battery ) you could say 2 volts or -10 from +12 (AKA pos of battery).
Havent seen the rest of the schem but the labelling is crap.
LOL

Honestly, the schematic is a mess but U1a is a rail splitter and its output should be 0V, but if the supplies are as labeled then it will actually be 1V.

It says it on your diagram ... -10 volts.
BUZ71 mosfet and associated cct forms a low drop out regulator. ( maybe ... thats my quick guess )...

Having followed BP for years and done much "airware" circuitry myself I can tell you that what looks neat to the human eye is often suboptimal when it comes to critical systems with subtle capacitances and inductances etc.
Especially if you are researching new ideas ( for instance the...

Hi,
While it may look simpler to some extent, did you try to implement it phisically? I also started with a vert simple schematic that got complicated because of all the problem I found on the road.
To be fair, it is still getting more messy as more functions are implemented, that is part...

One less dilemma, thanks Altra!

Is this sechematic a power supply, and how many volts should the output be?...

I checked everything more than ten times and I had no mistakes, When I turn on the device without a loop, it beeps I think the resistor values ​​in the diagram and pcb are wrong...

If it doesn't work, then you messed up something and now you can't find the error, and it's even harder for your colleagues on the forum to tell you where you went wrong. Start gluing a new board and according to the diagram, first connect the power supply, turn it on, measure if it's OK, then continue...

I didn't connect a coil, without a coil, the device beeps when I turn it on.

A short answer for PI, it will not work. There are always output protection diodes on motor controllers. These connect between the coil connections and power supply rails. These will divert the flyback energy to the power supply. For a continuous wave detector vlf or bbs it may work

Does it work with the coil on? Did you put a resistor across the coil?

Yes, it beeps without a coil. lf411...

Ok, this is not directly related to the topic, but if I don't write here now; I will forget later!
I have a "crazy" idea. How about using a finished H-Bridge module instead of the proposed TX stage?
(of course, only one clock and possible reordering of samples will be needed)....

MCP4725 together with AMS1117 please explain how it works....

The question "is it safe" refers to the case if I use the proposed mosfet transistors as well as the fact that it is an H-Bridge configuration.
Maybe it's a good idea to "fix" the frequency with a fixed resistance?
It's even easier and more precise to do it in code....

I mean't Analog.jpg

This picture gives a good idea for a youtube channel called "Breadboard circuits" where breadboard layouts are pictured for a whole range of popular circuits for experimenters and those learning electronics. But I imagine this has already been done.
Your...

less complicated

Carl, apparently the frequency adjustment range is very wide, going from about 330Hz to as high as 1.8kHz.
A simple question: "is it safe?"




​...

Although, it is difficult to clearly see the shift in the delay on such a small oscilloscope, but it is still roughly visible.
Yes, I noticed one thing; when I set the delay, upper oscillogram, TxP; moves, while the lower oscillogram (one of 4) stands still in place.
(the 10k trick doesn't...

Video on #231 shows exactly that.
...

Oh sorry!
The video only shows the frequency setting!
I recorded the delay, but the recording turned out bad, so I deleted it.
Yes, delay works too.
​...

Flashing the chip apparently worked.
Everything behaves as it should.
But my problems never end!
I can't finish the detector until I find the 74HCT4053, because no store in the state has it! Ha, ha, ha!
I'm 101% sure I have at least 5-6 pieces on the old boards in the attic....

Have you tried the frequency control or the delay control?

​​​​​​...

...

What does this have to do with this man's project?...

​...

Under 1, are you drunk or crazy? The second record does not exist and it is the original. Under 2, you should explain what is not working. If it beeps without the coil and works with the coil on then replace Lf357 with 411 and probably some ic is faulty replace tl064 with lf444.

Some time ago I was interested in ground water exploration and I researched nuclear magnetic resonance imaging method. I read whatever I could find as there wasn't a lot of information freely available. I never tried building such a device because I found it too complicated and crazy expensive. In addition,...

There is no connection. I checked. When the device turns on, it just beeps and I don't know what the problem is....

Do you have a clear picture of the original board?...

Thank you, although I have posted no image called image.jpg, the system might have renamed them.
But I guess you are refering to the one with the scope in XY mode?

Might even do some video and post them... who knows how it works out

Thanks again!