Hello everyone,

When viewing a PNG file on a mobile device, the resolution isn't optimal. However, this isn't due to the PNG file itself.
Here's a high-resolution (1200 dpi) schematic diagram as a PDF.​


...

AI made the biggest crypto hack possible.

https://www.bbc.com/news/articles/cwg7xp8kx4v5o...

Is the board working properly?...

This is so cool. The coil app runs in my old Firefox on Windows 7. It’s fun to work with it.​
The AI added soil model, GPU support, etc..
And even vector potential functions (I never implemented this but found it in the source code of the java script).

We have to ask...

Awesome project—congrats to Detectorist#1 and Geomax! You can tell a lot of work went into this, and it’s clearly a labor of love. Thanks for sharing it with the community—great job, and good luck!

One small request, though: the schematic in post #189 is a PNG, and the details and...

Hi all,

I am very impressed, excited and happy.
The coil software is taken over by Paul now (full right ownership).

Paul did huge amount of the part in a very very short period. AI is even capable to handle big old messy projects.

Big thank you...

Good job! The project is interesting. For people like me, it would help to have a step-by-step walkthrough: step 1 -> 2 -> 3… through to the result.

The primary TX field itself isn’t the interesting part. What matters is the secondary field: the one produced by eddy currents in...

Aziz and myself have collaborated to bring you SPULE32 which is Aziz's coil modelling software.
He has kindly provided the original source code ( C, C++, ASM ) which originally was built for windows and I ( with AI help ) have ported to Javascript.
So to be clear Aziz did all the work and...

Hi all,

the AI is doing a great job in the hands of Paul right now.
We will see some interesting news I think soon.
But it is up to Paul to do this.

Aziz

This is the revelation .. there is no need for fancy coding ... javascript has come a long way in recent years especially in active browsers like Chrome and Edge.
Ferinstance with plain javascript the spectrum scope does around 320 traces per second ... thats way faster than your eye can register....

Hi Paul,

is your AI coding the WebApp Audio application in Typescript or Javascript?
It is also using AudioWorklet​ for time critical audio functions.

One also could use WebAssembly technology to code in C, C++ or any other programming language for the pure DSP part....

My bad ...post #16 has v 2.2 latest. I fixed and added more stuff....

No attached file... only the .png image....

This is the Gemini AI Goertzel vs. Lock-in comparison (see PDF).

Even the Goertzel with Hann windowing, numerical instability on large sample block sizes remains.
I have a block size of 1920 samples. I will face with the numerical instability....

Yep, Gemini AI says the same.
Lock-in amp with Hann windowing is the way to go.
...

Claude agrees with you but this is what he said :

For the sound card, keep the lock-in as it is. Goertzel would give the same answer, and the current version is the better-behaved of the two.

What we have is already a DFT bin at the TX frequency, the same quantity Goertzel...

I went coding wild .... added the LCR , BODE and NAD modes ( noise and distortion) .... Only for sound card though.

Version 2.2 is attached below for your enjoyment ( or not ).

​...

Hi Paul,

nice App.

For real-time metal detecting approx. 100 times / s measurement is ok. Even 50 times/s is ok (slow motion version).
Instead of Lock-in amp demodulation, Goertzel will do it slightly faster.

With an ultra-low-noise amplifier, the...

Upto about 48Khz the soundfuse 2 usb soundcard is about the same performance of the AD7760.
Below we zoom into a 100 hz span to detect the 5 khz transmit carrier which is on but we just put a wire near the Tx and Rx so a bit of leakage carrier is seen at 5Khz. ( ie connected by air )
...

using a better soundcard ... an arturia soundfuse 2 ... the sampling rate is 96khz so we have a bandwidth a bit south of 48 Khz and a noise floor of -135 dbv... enough for MD work

​...

The next rather obvious step is just to allow DSPECT to connect to the sound card in the PC as an option.

So here it is .... if you select "SOUND" in the top menu it will popup a selection window. Default works most of the time.

Again its all running in the browser...

Hi cristiano.sar,
The Falcon MD20 detector is not a hobbyist project. It is a commercial product, so it is unrealistic to expect Gerber files to be available online. However, the circuit is so simple and designing the printed circuit board yourself is very easy.

You can enter exact values using the keyboard rather than the slider ( arrow keys should adjust also ).

The TX F slider moves in 1,000 logarithmic steps across N = 4…8191, about 0.77% per step. Around 5 kHz, N=499 and N=500 are only 0.2% apart, so the slider can’t land on 500. If you...

Those who intend to do this can take it as an example.​...

Yes friends, I’ve built the circuit; it’s very stable and highly sensitive.​

Are there gerbers available for the Falcon MD20? thanks.

There seems to be an anomaly with TX F... setting the frequency to 5.00K shows 5.00K in the TX F button, but shows 5.010K N=499 in the slider panel area... there seems to be no way to actually set it it to 5.00K N=500....

Using a 4060 in this circuit offers significant advantages; it can simultaneously serve as an audio oscillator and generate a virtual ground—this is definitely worth considering. To ensure the MOSFET stage is accessible for everyone to build, it could be implemented using the TLP250 or TLP350, which...

In that case, 7200/512 = 14 kHz; our frequency is 14 kHz.​

Hi Boilcoil,

No problem. Anyone can create their own PCB using the published schematic. The schematic and all values ​​are absolutely correct. However, it's not entirely easy to create a good design for a well-functioning PCB, as some traces are delicate and need to be routed precisely....

Tested on a breadboard

My mistake; I thought that active trading of the product was actually beginning.
I apologize to Algan and Geo Max.​

Hi Paul,

thanks for the nice comparison made by Mr. Claude.
Mr. Claude has definitely more IQ than Mr. Gemini (Google).

Oh well, the current chips aren't designed for dust. They are highly optimized for backprop.
At the moment, it is really smoke & mirrors....

Notes on the Quasar ARM hardware

1. No real-time TX current sensing. The board measures average TX current only, which is enough for resonance search. What it lacks is high-resolution, real-time TX current sensing on a second ADC channel sampled synchronously with the RX voltage, at the...

Mr Claude ran a full comparison of Dust vs Backprop on my local machine .... I am afraid that Dust must be renamed to Smoke ( and Mirrors ).

The method does work BUT ... Dust uses alot more memory and the training takes longer.



​​...

Which integrated circuit did you use for the antenna input in the schematic?

This is because the signals coming from the antenna have a value that is too low for the Arduino's input level.

Did you build this circuit on a PCB, or are you testing it in Proteus?

Hello everyone,

That's right, Algan was one of the buyers from Bulgaria who purchased two sets of circuit boards. I have no problem with him reselling the boards.​

I have built a device equipped with an antenna. I used an Arduino, a control screen, and a single button. I also added external components: an LM386 amplifier IC, a BD139 transistor, and a 10k variable resistor, along with ceramic and disc capacitors. The setup relies on a ground connection (negative/earth)...

Look colleague boilcoil​​, I bought two shipments from GeoMax​, but I’m busy with other things right now. I posted the ad in case another colleague wants them and has the time to apply them.I’m offering them at the same price I paid. What kind of "trading" are you accusing me of?...

UAC2 userspace driver implementation estimation (see PDF).
You see, that there is much more work. I have to bypass all the Android Audio Subsystem.

Why was Quirkdroid developped? Ok, for developping Apps. Not custom drivers!
Google, go f$k yourself! :ang...

Hi all,

finally, the AI says,
that implementing the metal detecting software in Android systems with exclusive access to the external USB sound card won't work very very likely on the budget consumer android tablets ( < 150 EUR). These tablets didn't implement the MMAP (Memory...

I haven’t had any issues with the Teensy so far, and since the ADC is external, dropping from 600 MHz to 170 MHz would be a step backward. Discrimination is perfect in the air; the VDI and the audio are different for everything. The control system can be written in a hundred different ways, and with...

Hi , i started a year ago thinking about pi with discrimination (long story and I will wrote it soon) - first with single mosfet and esp32p4 than teensy 4.1 and i have found if you really want repeatable results, you need truly precise control, as this will determine your ability to perform discrimination....

I used another method in quasar arm, for tx I used custom half bridge with RCD driver adopted for high voltage (like whites spectra v3i) , powering made by dcdc step up mt3608 converter (that has high working frequency more than 1mhz and low inteference noise on quasar arm) , tx coil connected series...

Hi all,

Dust is approx. 3 weeks old. This is a real break-through AI technology.

In all the AI labs, there is much "dust" now.
Caused by stress, hurry, "gold fewer", implementation and optimization pressure .. to get the best AI model ever.
...

Today I tested a 5" AliExpress coil with the Quasar ARM hardware and the firmware I’m developing.

The coil has no resonance components inside. It’s sold for the Chinese TX-850 metal detector.

The resonant networks are tuned for a TX frequency of about 10 kHz. I tuned...

, nice!

BTW,

the training of LLM's is making huge progress. In the future, we will get much faster and better model updates.
Dust (brand new training method)

An AI paper shows the comparison of traditional backpropagation vs. dust training....

No, you'll have to experiment with it.

hi vasilinik
good job you can shard this pcb and hex file...

Thanks.
Do you have any suggestion value for the parallel capacitor (red circle)?...

D & S are backward. Sorry, I don't know how to make it sound like a GPX.

I've been using an iPhone for years, various versions.
When I'm in the mood for a fight; I mostly spend my time arguing with Siri!
Ha, ha, ha!
Sometimes these arguments reach the level of heavy swearing!
A good "anti-stress" program.
Exhaust valve!
And then...

Let's take a quick break for a laugh!
Whenever we talk about AI; I can't help but remember this:​

...

Storing 3-state information into single cell memory will lead to special NPU chips.
https://en.wikipedia.org/wiki/Multi-level_cell

There is no other way until we find a good solution for 2-state (1-bit) information processing.

This is a good opportunity for winning the...

Found an interesting article on 1-bit-quantization:
https://www.mindstudio.ai/blog/1-bit...7b-model-phone

Reducing an information quantity into +1 (strength), -1 (negate) states does not solve the problem yet.
Destroying an information quantity (with...

Back to AI:

The extreme quantization of the AI parameters (weights) down to three states/values (+1, 0.0, -1):
n = ld(3) = 1.58 bits.
https://en.wikipedia.org/wiki/1.58-b...language_model

This is the minimum available quantization level at the moment.
...

BTW,

when a software product grows over the years, it also ends mandatory in quirk dev.
Copy & paste and quick & dirty dev also leads to quirk dev.
I know this, because I have a master grade in quirk dev.

I have ported many old quirk 16-bit MS-DOS...

Yep, I agree too.

That's the reason, why I rather fall back into pure ANSI-C coding (procedual programming). Even avoiding C++.
The pure reason for using C++ is the memory management of objects and structures (allocation, init, free, life cycle, exception handling). Not managing object...

Thanks.
Please watch the gpx iron rejection,
https://youtu.be/WlMXWP_TVN4?is=nCdxAJsJhs8t2bKO

I added the parallel capacitor and nmos. Please check nmos pins S and D is true?
Do you have any value suggestion for the parallel capacitor?
...

I agree ... Programming languages are built for humans not machines. AI would rather write 1000 lines of C rather than a single abstraction statement. Optimisation can't be done efficiently when you are far from the machine logic. I noticed recently that AI is even better at HDL than it is at procedural...

Thanks Carl & Altra!

I mainly didn't know the dimensions, but knew none of the barrel connectors I had would fit over the center pin.

I wanted to use my 12vdc power supply to test this on the workbench, until the battery arrives. I ordered the battery & charger...

I don't know exactly how the GPX sounds, but if you want to slow down Q17 try increasing R75 to maybe 100k. You can also add a parallel cap to ground, try different values. A big problem with this is that Q17 is NPN and will tend to turn off quickly due to the high gm-RL gain. An NMOS might behave better....

I can't give you a part number. The TDI and other Whites battery pack used 5.5mm X 2.5mm DC barrel plugs. Most standard wall plugs use a 5.5mm x 2.1mm connector. The TDI's center pin is larger diameter and won't accept a standard size. I would use a pre-made cable for safety reasons. You can make your...

It's a 5.5 x 2.5 mm DC connector, widely available.

...

I want to order some extra battery connectors that are used in the TDI, and connects to the Li-ion battery. Does anyone know the official part number, and manufacturer? Like Amphenol PC-1922993 (random junk as an example), or a Mouser P/N#?

I've tried all of the plug-in-the-wall power...

Show me your schematic.

The worst are "languages" that offer instant portability (Python is a good example), but even worse are web-based "languages" (it's not really a real language).
I think the future will remain only on hardware-oriented software.
Everything else will crumble like a house...

I just heard it on the news (I was in the mountains all day) and you can say it was to be expected.
That's why I'm an old supporter of C++ and I'm not deviating from it.
Sometimes (as a joke) I use Python.
All other "higher" languages ​​are as hollow as Swiss cheese....

Hi all,

this brief technical analysis summary lists some noise sources on USB sound cards (see AI PDF).

It doesn't list vendor specific noise sources of course.
On my Sound BlasterX G6 (@192 kHz SR), the upper frequency range (48 - 96 kHz) is completely noisy and practically...

...the main problem with soundcards is that the TX and RX signal generally cannot be phased locked at the sample clock rate. Then there is noise and bandwidth...the hardware I am using is 1.25 MHz ...that is fast enough for direct PI sampling. It only takes a couple of lines of code to make DSPECT...

Thanks for the tips....

I understand; I will do better next time. Thanks.​...

Hello
Dear Carl
I have a request, please see the posts #585 and #586.
If you remember, it is output of my DISC Demod (channel) and Blanking audio via 2n3904.
My Blanking is working but its speed is very fast. I am interested to do this like GPX blanking.
If you see, GPX...

PHP is a bunch of §hit of quirks broken by design.

See here:
https://www.thisdot.co/blog/the-quir...gotchas-of-php

But this applies to other technologies too. We have to wait and see. AI will open Pandora’s box.
...

Hi pito,



no, Visual Analyser is a quirk development software.
It can not be compared.
But it is useful for simple LCR meter measurements. On the other hand, there are way better measurement tools for LCR meters available.
Aziz...

Hi all,

PHP seems to be a quirk development.
AI killed PHP now.
https://www.bbc.com/news/articles/c3qjnwye0ep5o

What's next? Java & Java script? Python?
...

compare it with this ? Visual Analyser 26.10 no additional hardware need, just PC​ ​...

Hi,
Before sealing your C.Scope back up, I’d like to give you a few tips that will work really well:

1) ​Clean the solder side of the printed circuit board (PCB) thoroughly using a cleaner and a brush to remove solder residue, until the board is perfectly glossy/shiny.
...

Hi all,

pity, the low budget consumer android tablets won't support the features I really need. Not yet.
I would require Android version 14+.
And Oboe-C++-wrapper API isn't required at all as there is a native AAudio API.
But the OboeTester App can show me, whether an...

100% true!!!
I have 7 such "Ayatollahs" at home and I enjoy every minute living with them, though... it's not an easy life!

There is an old saying .... Dogs have owners and Cats have servants....

use more diffuse light. Carl on nerve if i ask it. for example i give you a pic...

Hi,
Additional information for the people assembling "Dual Tone Pulse Detector Rev.B":
1. Used search DD coil haves bridge connection in female connector between pin1 and pin5. This wire bridge have to be cutted.
2. The noise outside the buildings is lower than inside the...

Every country has its autocrat, tyrant, Johnny Cash has his "Personal Jesus"... and here in the family we have our personal Ayatollah!
There is no way we can do anything useful in the yard; until the great Ayalotlah gets his daily dose of free rides!
Even AI can't solve this!...

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-------

++

Interesting… The PCBs in the pictures are original boards. There were several buyers of these circuit boards from Bulgaria. Perhaps one of them offered one of their spare boards. Since it's an original set of circuit boards, I see no problem in reselling it.

Some more original PCB sets...

It works perfectly on Edge in demo mode....

Orbit was right:




Trading in this product began...
https://metaldetecting.eu/index.php/...cseen.html#new​...

... thanks and here is the actual GUI file that talks to the hardware. ( if you have the hardware )

It is just a single html file .. no apps / no webserver.

The only criteria is that is only built for Chrome or Edge browsers ( I didnt test it on Edge ).

If you...

That’s pretty close to reality, haha....

If you need any further photos or information, don't hesitate to ask while the casing is still open.
​

In addition​...

Hi,
Since photos of the CS1220XD circuit board are never seen on the forum, here are some.
Regards...

Hi Paul,

this is way way a much better tool compared to my hand written USB sound card tool.
Good job.
Aziz

... finding those pesky mains harmonics with 0.3 Hz resolution.

​...