Deus II: About the oscillogram

[Riss]

And yet - nothing new under the sun...
I feel disappointed- I do not mean the oscillograms - they calmed me down. The oscillogram of DFX ( Whites ) was really a novelty for his time- an elegant engineering solution. Monsieur A.Loubet has assembled a huge gang of software engineers to develop its new detector . This gang could impress us and his customers with innovations that are in the spirit of the past 15 years . There will be quite a few software upgrades ...I was impressed only by the reduced weight, the underwater headphones, and the fact that it can work 20 meters underwater - enough for me to drown

[Carl-NC]

It would be far more useful if he showed the coil current instead of the voltage.

[Taktyk]

Monsieur A.Loubet has assembled a huge gang of software engineers to develop its new detector . This gang could impress us and his customers with innovations that are in the spirit of the past 15 years .

Where can I find information about the project?

[ivconic]

Now... only thing that really interests me is if the Deus 2 is any "deeper" than Deus 1 on my soil and on Roman coins as targets.
Is there any progess in such cases.
Other words; will i get any real and usefull benefit by bying Deus 2 and replacing Deus 1 with it.
Apart from many new jingle&bells... in which i am not interested at all.
Because this year i plan to do something; either to buy few new coils for my Deus 1... either to switch to Deus 2.

[Riss]

I had in mind the design of Deus II

[Riss]

Where can I find information about the project?

I had in mind the design of Deus II

[Marchel]

Hi


If I understood correctly, a PWM signal without a resonant capacitor is applied to the input of the TX coil ?.


https://www.youtube.com/watch?v=87SbxRdIvCs

[Skippy]

To add more detail to my earlier post:
The modes:
P1 : General
P2 : Sensitive
P3 : Sens FT
P4 : Fast
P8 : GoldField
P12 : Beach; all run at 8.08 kHz & 40.4 kHz, a 1:5 ratio.
-----
P5 : Park
P9 : Relic
P11 : Beach; all run 8.08 kHz & 24.24 kHz, a 1:3 ratio.
-----
P6 : Deep HC
P10 : Dive; both run 4.76 kHz & 14.3 Khz, a 1:3 ratio ( not unlike the Fisher CZ range, but with a different waveform shape )
-----
P7 : Mono, a single freq square-wave, just like the Equinox in single-freq mode.

It's probably fair to say the GoldField mode is going to emphasise the 40 kHz. And the Deep HC will be using the 4.76 kHz as it's dominant one, to target the milled copper/silver coins.

[Riss]

Let's organize now betting - with money or bitcoins (does not matter - both are virtual , because they do not have a real gold coating - as the equivalent of value) which of you will know ( only by looking at the oscillograms ! )- at which oscillogram Deus II it will be quietest against the soil and the damned stones and beach searching and explain why - what is the reason ? These oscillograms carry a huge amount of information for potential opportunities on the device . And we don't need a spectrum analyzer at all ... I mean the minimum amount of bets to be 1600 euros - the price of one Deus II https://www.youtube.com/watch?v=87SbxRdIvCs

[Skippy]

I have done some thinking about the 'three-level' waveform, and realise what XP have done.

If you add a sine-wave and its 3rd harmonic together, you will obtain this sort of waveform ... you may remember how square waves can be synthesised by adding a smaller amount ( 0.333 ) of 3rd harmonic, then adding ever smaller levels of higher harmonic etc.
If you add the same amplitude of third harmonic, you get a waveform very much like XP's synthesised one.

I used an online graph-drawer called 'Desmos' ( quite neat ) and here's a plot of:
y = 3.25 ( sin ( 0.314 x ) + sin ( 0.942 x ) )
this is: y = sin + sin ( 3x ) , scaled so the period is 20 and the peak amplitude is 5.
Notice the points of inflexion occur at time values of -8 , -2 , +2 , +8 , not evenly spaced out, with gaps of 4 and 6 seconds.



I think XP have taken this sinusoidal waveform , and put a 'threshold comparator' on it. Essentially, if the amplitude is below +2.5 and above -2.5, it's made Zero, if it's above +2.5 it's made +5; if it's below -2.5, it's made -5.
The level-switching times match up closely. The detectors waveform period is 210 microsecs ( freq = 4.75 kHz ).
The middle of the first peak is at 21 usec, the second peak at 85 usec. The short 'Zero-volt' time is 10 usec, the long one is 30 usec.



It all looks a good match ... but it raises the question: why is this waveform not used on the higher 8k / 24k mode ?

Update: I added a new sinewave, with Period = 210 usec ( 4.75 kHz ) so it matches the actual waveform.

[Skippy]

For those who fancy generating their own recreation of this waveform: it can be closely modelled with just a 6-bit counter ( 00 to 63 decimal ).
Output levels for the 64 states are:
Count (dec) : Volts
00 : 0
01 : 0
02 : +5
.
10 : +5
11 : 0
.
20 : 0
21 : +5
.
29 : +5
30 : 0
.
33 : 0
34 : -5
.
42 : -5
43 : 0
.
52 : 0
53 : -5
.
61 : -5
62 : 0
63 : 0

This waveform has considerably more 3rd harmonic content compared to the Fisher CZ '5kHz square-wave' approach.
The CZ should in theory be a 3 : 1 ratio for Fundamental : 3rd harmonic.
This XP wave is 1 : 1 ratio ( or pretty close ..)
This would be better from a noise perspective, I think.

[Skippy]

More thoughts:
While that table above will generate the correct TX waveform, it's not possible to generate correct 0 degrees & 90 degrees synchronous detection signals from the 64 state sequence. It needs to have a multiple of three in it to correctly synch-detect the third harmonic.
So 3 x 64 = 192 steps per cycle is needed, then the synch detection switching points for 3rd harmonic are at sample number 16, 32, 48 ,etc.

(( I'm thinking here about homebrew projects, such as Fisher CZ-inspired 'mostly analogue' electronics machine, with digital/micro to generate the difficult timing signals ))

[Riss]

Today a friend told me that in 2 weeks - 3 new software upgrades on Deus II . It made me laugh. I knew that this detector would have a lot of software upgrades . Apparently they have decided to receive a Guinness award for upgrades . There will be many more upgrades .There will be upgrades of the upgrades . There will also be upgrades of upgrades on upgrades . And so on . Oh God, protect us from the evil one ,,Upgrade

[ivconic]

Today a friend told me that in 2 weeks - 3 new software upgrades on Deus II . It made me laugh. I knew that this detector would have a lot of software upgrades . Apparently they have decided to receive a Guinness award for upgrades . There will be many more upgrades .There will be upgrades of the upgrades . There will also be upgrades of upgrades on upgrades . And so on . Oh God, protect us from the evil one ,,Upgrade

Well... i have funny story. 9 years ago when i bought Deus 1, f/w was 2.0. Than they started with upgrades, updates.
It was 3.0.... until today v5.21.
Comparing to v2.0; some things are changed in a positive way, some functions refined and i salute many of the changes.
But instructed by previous experience with iPhones; I began to fear from every next addition.
As time went on; Deus did just as well as the first day. So I was afraid that one of the
next updates would be such that after a while Deus would stop working well, show symptoms of
hardware failure and that I would eventually be forced to buy another.
I was afraid that XP would follow the business strategy that Apple no doubt already had with its products.
And some others ...
This is especially noticeable today in the auto industry.
I had an Audi 90 GT Coupe (4000 in USA market). It had galvanized sheet metal, very thick and strong, it had leather seats,
it had a perfect engine that does not break down. And it lasted 30 years and more.
And then they started making cars with thin sheet metal, which is not galvanized, weaker engines in terms of quality,
a lot of sensors and electronics, and such cars started to last only during the warranty period.
Today I drive a 32 year old Opel. It is in perfect condition and can last for at least another 10 years.
But it has no "electronics", no computers and no sensors. And it finishes my job and all my needs perfectly.
But now the state is threatening me that it will not allow me to drive it for a long time.
They bring new rules and my Opel will soon have to go to waste, by force.
Since they added high integration with digital systems to cars, many sensors (most totally unnecessary) and it is
noticeable that your car works perfectly only until the expiration of the warranty period.
That way they force you to change the car and that way the industry survives.
I'm sorry but I have to mention that this is a very symptomatic situation with French car manufacturers.
Because if you make the perfect product that does not break down and lasts a long time beyond the warranty;
customers will not need to replace it.
Fortunately, so far, XP has not followed such a (sick) business strategy.
And that's the story. It is funny (and sad) that I have been scared of such things ever since.
And I see every next update as a special risk to turn my favorite product into a brick.
Unfortunately, this turned out to be more than just paranoia. How many smartphones and tablets
have we had to change so far because of that ...
Perfectly correct and good product; suddenly starts behaving and working differently, slower, with delays and mistakes.
I will repeat; fortunately so far XP has not followed such a business strategy, I hope it will remain so in the future.
...
I am a slave to good (and some bad) habits. Once I get used to a device, a car, a piece of furniture in the house;
I don't like to change that.
Ideally, I could use these things for the rest of my life, as they are.
I don't like change. I don't like "new". If the thing satisfies all my needs; then I want to keep it for the rest of my life.
And it annoys me terribly when someone in such a mean way submits to me the need to change something.

[ivconic]

The scariest thing in the whole story is that the pharmaceutical industry also liked this "business" practice and method.
So today they no longer produce drugs that completely cure the disease.
Today, they produce drugs that only cure some of the symptoms of the disease.
Because a completely cured patient ceases to be a customer.
And the partially healed patient remains customer until the end.