Originally Posted by Fred (Post 81966)

Hi
I recognise the construction modus operandi...lots of small PCB´s ,long-wired together...:lol:
Esteban, if you just need a very hight amplification factor, why you don´t use just an opamp, instead of all that stuff ??
regards,
Fred.

Originally Posted by michael (Post 81947)

Hi Esteban. nice and congratulations, but how are you sure "Treasure can't scape of it"?
do you have any case report? what have experienced with that?found objects, weather conditions,......

Originally Posted by Esteban (Post 81974)

Because I detect very well some silver objects I have buried since 10 years and bronze stuff (round form, 25 cm diam.), so treasure can't scape, except is in iron box...

Originally Posted by Morgan (Post 81975)

I´m not so sure that the iron box limits the LRL of finding the treasure...:rolleyes:

Originally Posted by Esteban (Post 81896)

Absorption type. In the way.

Originally Posted by Geo (Post 81979)

Hi Esteban.
The tube is plastic or metalic????
Also the shield has any gap ??

Originally Posted by nelson (Post 81983)

Felicitaciones Esteban y espero me comentes tus experiencias futuras.
EStoy a la espera de lo ofrecido por email personal ( ce3llp@mi.cl)
Atte.
Nelson

Originally Posted by putrechigi (Post 81944)

photo seems very seplice be built over the years you have successfully reduce everything to the minimum;);):thumb::thumb: or e 'a new project:cheers::cheers:

Originally Posted by maimoune (Post 81990)

.....Good Luck new project.
congratulations

Originally Posted by hung

Ferrite captures the electric emissions of the long time buried metal but when inside a metal box, this acts as a shield for the elec. field.

There's a way to overcome this and I'm sure Esteban will eventually know about it or probably he already does.

Originally Posted by Alexismex

many time i find coins in the soil remove it and pass over the coil (VLF) you have sometimes the Halo effect a small signal result and in 10 o 30 second this shallow vanish...
But I do not know if it is electro chemical o electro magnetic o other effect ???
Alexis

Originally Posted by J_Player (Post 82007)

Electric emissions from long time buried metal are a result of ions formed in damp soil when combining with other compounds in the soil that can dissolve trace amounts of the metal. If gold is contained inside of an iron box, or a plastic box, or any other box that prevents the gold from coming into contact with the damp soil and the chemicals that can dissolve trace amounts of gold, then there will be no electric emissions, as there are no gold ions in the soil.

I would think the best way to overcome this is to bury the gold without any iron box to prevent it from contacting the soil and creating trace amounts of gold ions.*

*(This solution will work ONLY if the trace amounts of gold ions that dissolve into the damp soil become concentrated enough to create an anomaly in the soil that can be detected with an instrument that is capable of detecting secondary effects associated with the presence of these ions).

Best wishes,
J_P

Originally Posted by J_Player (Post 82011)

A VLF detector is only capable of detecting things that will change the magnetic effects of the search coil. It does not detect any chemicals unless they can generate eddy currents that allow changes to the magnetic effects. The chemicals that are known to allow eddy currents to form are the metals that conduct electricity, such as copper, nickel, iron, aluminum, gold, silver, etc., and mixtures of these metals.

It is theoretically possible that when searching in non-conductive soil that has an area where there is an anomaly of very conductive soil, a VLF detector may be able to detect the conductivity change in this area of soil. This means the conductivity of the "conductive area of the soil" must be similar to the conductivity of a metal object. But I have not seen any testing results that demonstrated there are areas of "more-conductive soil" that were detectable with a VLF detector. The only exception is soil that has "hot rocks" or pockets of conductive sands in it, or in very iron-rich soil similar to the soil found in the Australian gold fields. These areas that have pockets of "more conductive soil" do not produce treasures, but only areas of conductive rocks and sands.

Best wishes,
J_P

Originally Posted by Morgan (Post 82023)

You know why the pistoldetector catch this ELECTRIC EMISSIONS FROM BURIED METALS ? Becouse as the PASSIVE RECEIVER,circuit very sensitive to electric and electromagnetic fields.
And my theory is that the GOLD as much stronger electric emissions than other metals. The Gold acumulate much more energy ,but other metals acumulate and irradiate less energy.

Originally Posted by Esteban (Post 81921)

Finish and works great! Treasure can't scape of it! Is easy to mount in a plate (in this case, fiber glass), all are at hand. Radio is not use here, just amplificative stages.

Regards

Esteban

Originally Posted by Clondike Clad (Post 82032)

How can you tell gold from silver with this?
Can you pick up rings and how far?

Originally Posted by Esteban (Post 82054)

No at high distance, just 5 meters. Better for big items as treasure.

Now I replace magnetic speaker by piezo, this not disturb as speaker based on coil and magnet. Also consumption is lowest.

Now, I'll replace the audio amp of radio by circuit based on NE5534 or similar. This is just for to try ferrite.

Regards

Esteban

Originally Posted by Esteban (Post 82054)

No at high distance, just 5 meters. Better for big items as treasure.

Now I replace magnetic speaker by piezo, this not disturb as speaker based on coil and magnet. Also consumption is lowest.

Now, I'll replace the audio amp of radio by circuit based on NE5534 or similar. This is just for to try ferrite.

Regards

Esteban

Originally Posted by Esteban (Post 81921)

Finish and works great! Treasure can't scape of it! Is easy to mount in a plate (in this case, fiber glass), all are at hand. Radio is not use here, just amplificative stages.

Regards

Esteban

Originally Posted by Geo (Post 82058)

So, you will connect the ferrite directly to the 5534 ?????
Or you will use the first preamlifier with transistors??
Regards

Originally Posted by Clondike Clad (Post 82069)

If I got this you can pick up ring a 5 meters.
If this is so it can pick up Carl's 10oz gold bar.
THAT IS $25,000 YOU CAN GET.

Originally Posted by gef12 (Post 82071)

Hey Esteban what country do you live in .. let me think it is the tropical region somewhere

Originally Posted by Esteban (Post 82078)

I prefer 2 transistor pre connected to NE5534 or similar IC.

Regards

Esteban

Originally Posted by Esteban (Post 81988)

No me olvido, solo que quiero también terminar cosas que empecé.

Saludos

Esteban

Originally Posted by Geo (Post 82084)

Good. For me is better to use a preampl all with transistors and in dc coupling. It has better slew rate !!! A good pre is the audio prelude from Elektor

Regards

Originally Posted by Esteban (Post 82101)

The prelude is the sintetizer or what? I remember it...

Regards

Esteban

Originally Posted by aft_72005 (Post 82121)

Hi Esteban :)
Not synthesizer, prelude ,name of amplifier article ,published
By elector magazine .also at far past.
Best regards.

Originally Posted by Esteban (Post 82140)

This is the Prelude, +15/0/-15V :shocked:

Originally Posted by Max (Post 82157)

Does the buried gold emits RF waves ?
Or the buried gold absorb some outside generated RF waves ?
Or the buried gold enhance/focalize some outside generated RF waves ?

Max

Originally Posted by hung

I'm almost positive anybody in the remote sensing forum following this subject for years knows the answers for these simple questions.
Why not you?

Originally Posted by Esteban (Post 82140)

This is the Prelude, +15/0/-15V :shocked:

Originally Posted by Max (Post 82157)

Hi Esteban,
I read some older posts in this thread and seems you made a double ferrite antenna with a coil over one half, shield and cable... spacing 5mm.

OK, let me think you are talking about some VLF receiver , say some tens kilohertz, and remember me something already seen somewhere.

But what I do not understand is wich kind of signal you're looking for: 3 questions cover the topic I think at 100%.

Does the buried gold emits RF waves ?
Or the buried gold absorb some outside generated RF waves ?
Or the buried gold enhance/focalize some outside generated RF waves ?

If your device works, one of the above questions you must answer with "yes".

Otherwise I see no way that the device could work by means of being a pure RF / VLF receiver, no matter of "how" that action is performed.

Kind regards,
Max

Originally Posted by hung (Post 82163)

I'm almost positive anybody in the remote sensing forum following this subject for years knows the answers for these simple questions.
Why not you?

'The truth is not out there'... It was always in here...
Sorry I couldn't resist.:lol:

Originally Posted by Qiaozhi (Post 82184)

The hidden message in Hung's words is (since the answer is as obvious as the nose on your face) that you must be incredibly dumb to ask such a question. :lol:

Of course, "we" all know the real answer... :razz:

Originally Posted by Max (Post 82157)

Hi Esteban,
I read some older posts in this thread and seems you made a double ferrite antenna with a coil over one half, shield and cable... spacing 5mm.

OK, let me think you are talking about some VLF receiver , say some tens kilohertz, and remember me something already seen somewhere.

But what I do not understand is wich kind of signal you're looking for: 3 questions cover the topic I think at 100%.

Does the buried gold emits RF waves ?
Or the buried gold absorb some outside generated RF waves ?
Or the buried gold enhance/focalize some outside generated RF waves ?

If your device works, one of the above questions you must answer with "yes".

Otherwise I see no way that the device could work by means of being a pure RF / VLF receiver, no matter of "how" that action is performed.

Kind regards,
Max

Originally Posted by Esteban (Post 82187)

rapid movement catchs spurious induction???

Originally Posted by Great_Alex (Post 82238)

maybe Steban doesn't know how his device work .
i don't find a reason that Steban lie and pretend to us that his device realy work . if you want to build a real device you should realize the theory of how it works , then try to change and improve it .



Esteban , is it neccessary to sweep your device to find a target , when you point staright to a target in a fix position , your device has a permanent signal , or not in a moment it has a signal and the the signal disapear ?
please describe more about how you operate it and how is your device response ?

if it detect RF wave , why rapid movement make strong iduction voltage ?

Originally Posted by Morgan (Post 82251)

I´m sure Esteban dont know all about the phenomenon but he try to know as much as its possible,and me the same but unfortunatly i´m not electronic Engeneer...
Me and some other members in this forum say thanks to Esteban for all the information he give to us.
I think sooner or later,the LRL devices jump to the perfection.

Originally Posted by Great_Alex (Post 82238)

maybe Steban doesn't know how his device work .
i don't find a reason that Steban lie and pretend to us that his device realy work . if you want to build a real device you should realize the theory of how it works , then try to change and improve it .



Esteban , is it neccessary to sweep your device to find a target , when you point staright to a target in a fix position , your device has a permanent signal , or not in a moment it has a signal and the the signal disapear ?
please describe more about how you operate it and how is your device response ?

if it detect RF wave , why rapid movement make strong iduction voltage ?

Originally Posted by Esteban (Post 82261)

Maybe I can't explain and translate in a formula, etc., just wish to found better system!

The gold is detectable at some meters, old gold, not new. This detection is good when the pistol is in horizontal position, but bad or null when pistol is in angle, I presume as pistol is more in plane of Earth, this mask the phenomenon... very complex!

But with antenna / open base transistor the phenomenon can be detected in any position (angle), of course better in horizontal position. This is part of the phenomenon I know.

Sometimes detection is permanent, and maybe deppend of type of detector or/and input used.

Originally Posted by Qiaozhi (Post 82293)

If the PD needs to be held in a horizontal position, then why does it not detect a target that is behind the operator? How do you know whether the signal is coming from the front or behind?
Also, in your avatar, you are pointing your PD at an angle..

Originally Posted by Great_Alex (Post 82310)

how is the response of your detector to Cell Phone EM or when thunder happens or when you turn the room light off and on , did you test this ?

it is more strange to me that why it does not detect the object from behind ? does the ferrite antenna make these one way detection ?

Originally Posted by Great_Alex (Post 82310)

how is the response of your detector to Cell Phone EM or when thunder happens or when you turn the room light off and on , did you test this ?

it is more strange to me that why it does not detect the object from behind ? does the ferrite antenna make these one way detection ?

Originally Posted by Esteban (Post 82294)

This occurs in house. There is a site in garden in wich a child loose a small broken gold ring 10-12 years ago, and maybe the open ring causes it. In my avatar is in angle because was detected a closed ring, very old. If you cut a small ring maybe also is hardzarous detectable with common MD, maybe this explain, hope in open field and with old targets can be different, but any project can be different... Oscillator with coil as pistol don't suffer this problem, also loop low impedance you see in other projects can be used in angle.

At this time don't detect behind operator, but yes in sides, right or left. I can know the position of target because when you pass over it, tend to increases the beeps.



Regards

Esteban

Originally Posted by humhum (Post 83104)

schematic

Originally Posted by detectoman (Post 83160)

this antique circuit of brother humhum sems cool' morgan
but the thunting enginers not think in simple circuits, but complicate jaja
is one extrange mode of mind
i only love' lrls., are superior to complicate gpr jja

i need build one simple and manual radar, i kilo maxime wheigt, go make this hha

Originally Posted by abdou2014 (Post 155253)

Sorry i shouldn't have done this .