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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?