Please Answer???
 

Only for bigger metal ore deposits (especially Ferro type) in soil which can cause sensible anomalies in Earth magnetic field. Not useful for small targets.

But can work the same way as most known LRL pistols.

OMG ! this is a modern copy of the PD ! :D

tank you wm6
What can be the circuit's sensitivity to small metals such as coins would not?
What do you mean the big metal?What size?
Whether it is used as a real pD?
e high sensitivity of the large size of the ferrite and coil circuit?

Dear Friends!
This VLF Reciver I took over from the Greek Forum "Psaxtiria":
http://www.psaxtiria.net/forum/index.php

http://img14.imageshack.us/img14/2615/63276924.png
Uploaded with ImageShack.us

Please Geotech1 more experienced forum members to provide their solution ferrite coil for the VLF Reciver.
Thanks in advance!
Regards
Zocky-Zocky

For coin it cannot be used for sure.

For other target sensitivity depend on "virginity" of terrain: in soil hard polluted with civilisation trash there will be too much disturbing signals to differentiate it from useful signals. On clear terrain you can detect one 50x50cm metallic plate at some meter distance (it depend on detecting angle too).

Of course sensitivity (in fact directivity) depend on how large ferrite rod is (you can glue two ferrite rod together to enlarge it).

You need first to tune your Earth signal detector to strongest and steady signal (Earth signals are not the same during time of day).

Quote:

Whether it is for the detection of metals located in the basement can be used remotely?;)

good probe for all any electro-magnetic sources' types detection. you will see and learn how much our planet had been dirtied by so named white noise spectre (american and europe union hitech industry does all your probe is working fine). practical value there is not.

tank you very much wm6
Please help me to build a sensitive ferrite and information necessary to make the antenna give???
Wire and the wires and the ferrite???
waiting your answer
whith recpect

Hi WM6,
This could be used as a nice metal detector for large objects.
But I was wondering if you can post a circuit with tuning instructions for a long range detector that gives a flat response over the treasure metal band?
I am mostly interested in the gold/silver band, but I also would like to detect the platinum alloys which might be found when people lose their jewelry at the beach.

A simple analogue circuit with ferrite would be good, but I prefer a hybrid with a 256 channel detector plus 4 application Specific Integrated Circuits (ASICs), comprising 64 channels each, which perform front end analogue signal processing, A/D conversion and multiplexing.
of course, the unit must be portable to carry into the field.
And it must be able to contend with the rigors of hiking over hill and dale, and must be rugged enough to withstand occasional dropping in the mud during the treasure hunting operations.
However, if the platform is spin-stabilised, the earth image could be stabilised on the detector using a de-spin mirror.
Then the earth image would be present on the detector only for 40 ms at the most, and the S/N could be kept to acceptable levels for jewelry recovery purposes.

Maybe this is too much to ask, but I would like if you can post a project that can do this if it is possible.


Best wishes, :)
J_P

Hi Zocky-Zocky,

Maybe you are correct.
But I hear a different story...
Dr. Best = Merlin


Best wishes,
J_P

Hi J_P

you are known as passionate fisherman.

For fishermans this veeery long range detector will not work due excessive humidity in their shoes.

So sorry.

Hi WM6,
Fisherman shoe humidity is not a problem.
I can get shoes made from Teflon.
These shoes are expensive.
But they are worth the money because they solve the fisherman humidity problem. :)


Best wishes,
J_P

You use ferrite rod for ferrite antenna say 10x200mm, but in rule "the larger, the better". You can glue (with glue for ceramics) two ferrite rod together as on drawing. CuL wire diameter less than 0.2mm. Wire can be wound iregular (in zig-zag manner).

Final inductance of about 57mH. I cannot say how much turns, it depend on ferrite you use. You need to wind first 100 turns, measure inductance and calculate approximative number of turns.

Teflon? Ekcellent stuff.
I am only not sure, maybe it can bring you out of sensomotoric ground balance?

Of course sensomotoric balance is compromised when not wearing rubber fishing boots.
But this is not important when we are not trying to maintain balance on a fishing boat.
When we are treasure hunting and we have a fully electronic long range multi-band spin-stabilised LRL, the sensomotoric balance is no longer needed.
This is because the electronic LRL will work even while we sit inside the helicopter with seat-belts fastened and fly to the location where it directs us to.
The only remaining problem with the Teflon boots is they do not become dirty because of their non-stick properties.
Dirt seems to simply fall off.
But this is not a problem...
It means I do not need to wash my Teflon boots unless I step in something that is very sticky. :good

Best wishes, :)
J_P

Sounds very promising. Probably your Teflon boots are the same thing as NASA used for moonwalking?

Moon walking?
According to Rocketdyne's head of technical publications Bill Kaysing, the moon was never walked on... :shocked:
But I saw people walking in water where fish are caught with my own eyes. :)

Best wishes,
J_P

I wonder what year is the number of this Elektor.?

I am wonder too.
I even cannot find where I am posting first time this circuit here on forum. Mesy not decided to got us link.

Hi WM6,

Here is where you first posted this circuit: http://www.geotech1.com/forums/showt...86#post=131986


Best Wishes,
J_P

Thanks J_P.

With two glued ferrite antenna rods we can get of about 40cm long ferrite antena.

Pistol can be build by this antenna and proposed circuit according this Erevnitis design:

tank you very much dear wm6
Both the wire on the ferrite is complex?
What material is the orange?
Ferrite is the longer you cause more sensitivity???

No complex, it is very simple. You first glue both ferrite together and then put it in adequate "tight" plastic tube. Then the coil can be wound on plastic tube - not direct on ferrite rods. Done so, you can make some tunning to the best signals by moving ferrite rods in tube back and forth.

"orange" is coil wire (Cul windings) presented in cross section.

Yes, with longer ferrite you can get more directivity which in results is same as more sensitivity.

I still wonder. What year and number.

This is not an advantage to connect the ferrite NS polar opposite in a row.

I think this just might be the sensor.

should we read Elektor article.

.........

tank you very much dear wm6
The new metal detector will be revealed during in the soil?
If the new metals in the soil can not hide the obvious?
Tell me how to test the circuit?please
waiting for yoy
whith respect

Schematic is modified and I dont know exact source anymore, but as seems source can be from Elector.

It is about ferrite antenna rod and not ferrite ceramic magnets, so NS polarisation will not take effect. My first comment should not be understood that it is obout some sort of Earth magnetism sensor. It is about Earth signal sensor.

I am not sure that I understad what you are trying to say.

Soil is not a barrier for Earth signals of very low frequencies.

You can sense only bigger metal (or metal ore) deposits in soil on basis of changing Earth signal magnitude here converted in number of LED pulsation.

Hard poluted soil with bigger metalic parts mean unwanted disturbation during detecting.

Hi WM6,

When you originally posted this circuit, you said it was an earth signal pistol which operates at a frequency range from 666Hz to 3066Hz.
I see three frequency settings available in this circuit.
These are ULF signals which are observed as either natural or man-made noise signals traveling through the ground and atmosphere.
Because there is a ferrite sensor, we can expect it will be more directional than a plain loop, and it is much more directional than a telescoping antenna.
But since this is a receiver, we depend on these earth noise signals in order to make detection.
If there is no earth noise signal then we detect silence.

I have two questions:
1. How do you use this for finding a signal?
Do you experiment with different frequencies to see what works best?
Do you look for some frequency that has a lot of noise so you will get some detection?

2. How do you use this for finding buried metals?
Has anyone determined that detecting the direction of this noise signal will tell you the direction of buried metals?
I look at the antenna, and I see that when you point it at the source of the signal, you can expect to find a null signal, or silence.
Does this mean we look for a null to determine where buried metal is located?


Best wishes,
J_P

Device can be used as pistol detector i this way:

http://img163.imageshack.us/img163/5195/siefusern.jpg

We cannot determine best frequency in advance because there are not the same frequency spectrum of Earth signals with best magnitude on different locations.

So we need to tune detector to general reception (on different terrain points) of best magnitude (most constant pulsation of LED) at current searching location.

Then we are searching for changing in those pulsation on different location points. Sharp repeatable changing in pulsation by sweeping pistol over certain location point is significant.

As you say, LED pulsation can go from high to low (in case that bigger metalic deposit make shadow between signal source and detector) or opposite (in case that target is resonating on signal frequency or one of its harmonic or in case of reflective sum of signals).

Of course device is still in its early phase and will be further developed on new LRL forum by help of experts like dr. Hung and Mike Mont.

Thank you WM6.

Now I understand.
But this is a fully working directional ULF receiver that really does receive a signal.
How can Dr. hung or Mike(Mont) help give tips when we see there is no calculator, and there is no 555 timer? :remember

Best wishes,
J_P

I told you I did not notice:frown:
I can not hide it under a metal in soil and I find it?new metal not old metal?
How can I test it after the hardware detection and I know it works?
Can you believe how far away from there with a metal detector found in the soil?
with respect

Dont worry, dear J_P, this device can be upgraded even with scientifical graphic calculator, not only with simple one as rangertell. You even do not need to mount calculator on pistol - all can be upgraded and work on remote basis. But let we those sweeties for coming versions of this extremly promising LRL pistol. We do not need timer all work is done by Flip-Flop.

Good question. Read explanations on mineoro web site.

tanks dear wm6
I can not hide it under a metal in soil and I find it?new metal not old metal?
Can you believe how far away from there with a metal detector found in the soil?

Very deep, dear Mesy, very deep, you can even sense EMECS (Earth Magma Eddy Current Signals) if device is proper tunned on those frequencies. You will have a lot of fun with this devices, no matter of freshness of your metal.

Earth waveguide
 

Hi Mesy64 this is report from NASA:


Earth-ionosphere waveguide (NASA Thesaurus)
A natural waveguide consisting of the atmospheric duct formed by the ionospheric D region and the surface of the Earth making possible long-range communications in the 10KHz frequency range.

tank you dear
This circuit is suitable for you to find metals in the basement?

How is the working frequency of the circuit and how this has changed??
Which part of the operating frequency can be measured?