Zahori mods. - Some considerations

[Esteban]

I check my old PCB and found an only error regarding 1 nF cap, really is 10 nF. In other words, frequency is 100 Hz or near 100 Hz in pin 3 of the 7555 (or NE555).

Respect Ivconic's implementation, no necessary all the switches and caps. Only a 10 K pot. and switches for batteries. This pot. acts as sensibility control as a threshold adjustment. No need more.

My alterations are:

1. 3 telescopic antennas. Plates collects more interference and shows capacitance. Laterals antennas to 0 V. Laterals open 40-45 cm and central 60-65 cm.

2. Variable 2M2 preset replaced for fix resistor of same value.

3. Eliminated 100 K resistor in serie with 2M2 preset replaced, now fix.

4. Eliminated both switches S1 and S2, wich select for search electricity in walls and water flows.

5. The point 4 mean that only 10 nF is connected between pins 2-6 to negative.

6. Pin 9 of the 4066 no connected.

7. Eliminated visual section and replaced by trafo.

8. 22 K variable resistor (volume) replaced for fix 22 K.

[Esteban]

About text, translation by Qiaozhi has few readers. Near 600 in difference who looks images. Here:

[Esteban]

Features:

[Qiaozhi]

About text, translation by Qiaozhi has few readers. Near 600 in difference who looks images. Here:

Hi Esteban,

Yes, it is very strange. Why did so many people download the circuit, but not the description about how it works?

[J_Player]

Hi esteban,

Is there some application for treasure hunting where the zahori will find treasure better than your new experimental coil model LRL that you are testing?
Or is your new model always better for finding treasure than the zahori?

Best wishes,
J_P

[Esteban]

Zahori has an audio reference in delicate threshold point you're be able for to find the most sensitive and stable. Input frequency or electric signal mix with internal fix frequency, as a BFO. So the 4066 switches acelerates and ups the audio level and glitchs beeper circuitry in audio section.

[Esteban]

Hi Esteban,

Yes, it is very strange. Why did so many people download the circuit, but not the description about how it works?

Hi Qiaozhi,

No, isn't strange. Leave me an impression as many takes very light this. Remember, each day the people is more light!

[Qiaozhi]

Hi Esteban,

Yes, it is very strange. Why did so many people download the circuit, but not the description about how it works?

Hi Qiaozhi,

No, isn't strange. Leave me an impression as many takes very light this. Remember, each day the people is more light!

Actually I think the real reason is that most people are just collectors.
They see that someone has posted the Zahori, and they think "Oh goody, another schematic for my collection".

I still haven't built the Zahori, as I'm very busy doing other things, but I intend to get to it one day.

[Esteban]

Hi esteban,

Is there some application for treasure hunting where the zahori will find treasure better than your new experimental coil model LRL that you are testing?
Or is your new model always better for finding treasure than the zahori?

Best wishes,
J_P

Hi J_P,

As I read in other part that some persons can't achieve a beep with it, I suspect they build complicate version. This severals mods. I make near 15 years ago. Since I and my group found an old gold gross chain at near 1 meter depth, I believe is useful for to find treasures.

One time, my brother-in-law use my Zahori and go in a site they saw as a light emanated from the soil. They saw it 30 years ago. They arrive in the site and found a hole excavated for others, and the device beeps and beeps, only in the place, but NEAR the hole. The persons who previously excavated don't found the treasure. My brother-in-law and others can't excavate in the place because the signal "explode" around the hole, and can't centrate. Also the landlord, a rich man, don't wish to continue in it!

IC 3130 (input) BURN here! Treasure = energy!

Don't know if is better than my new experimental devices, only I know go depth.

The small problem is that once I found a complete 100 m roll of wire for fence somebody forgot and the years buried few centimeters. This roll of many turns of wire for fences also was detected.

But I know also is sensitive to electric lines, fluorescents lamps. Is for use in fields free of interference.

[J_Player]

Hi esteban and Qiaozhi,

I look in my saved Zahori directory, I do not find any schematic. I only downloaded the PDF file that describes how to use the Zahori "Electronic Zahori.pdf". Maybe I am the exception different than the others who want the schematic only, because I never downloaded the schematic.

I remember when the Zahori was first shown in this forum, everybody talking about mods, and also some similarities to Ivconic's earlier ion detector project. I never looked very close at the circuits because so many people were talking about modifications. I only read the circuits people posted in forum imanges, not the original PDF circuit download.

My interest is not to make a zahori or to add a zahori schematic for a museum collection, only to understand how it works and how efficiently it performs compared to other experimental LRLs. I learn the answers only by listen to reports from people who build and test these experimental LRLs. I find esteban and only a few other experimenters make accurate reports of the performance of experimental LRL circuits. Some others give little actual test information, and mostly clown pictures and diatribe, so I don't pay too much attention. Thank you for your excellent description of how the zahori works in the field for you. It seems amazing you burned an IC from finding signals in the air.

Another question to compare the zahori performance to your new designs:
What abilities of your new designs are an improvement in performance, better than the zahori? ie: Do your new test LRLs have longer range? Do they have better resistance to electrical noise? Are they able to discriminate better? Is there some other improvement I did not ask that makes them better than zahori?

Best wishes,
J_P

[Esteban]

New Zahori. I build this with tone control as MD. Arrival signal mix with the audiofrequency and go!

No yet assembled it. 741 reveals also very sensitive in this new dispossition! 555 was replaced for 4047 BE, good IC. Also put a voltage doubler wich ups the 18 V to 35 V. Maybe can be useful for to polarize a kind of aluminium dish.

In via for to obtain more sensibility, I replace the 741 input for the faster LM318, but the noise is incredivel with this dispossition! I hear noise inter-stations type AM! So, return to the 741.

Pin 13 of 4047 BE shows frequency X 2 = 800 Hz. Really I obtain 411-412 Hz and in the pin 13, 822-824 Hz.

[Esteban]

Another question to compare the zahori performance to your new designs:
What abilities of your new designs are an improvement in performance, better than the zahori? ie: Do your new test LRLs have longer range? Do they have better resistance to electrical noise? Are they able to discriminate better? Is there some other improvement I did not ask that makes them better than zahori?

Best wishes,
J_P

Hi J_P

One of these is based in to mix "external signal of gold" with local oscillator in Khz range. This discriminate much better. This have better resistance to electrical noise.

In few words, I'm not engineer, but I have 28 years of experience in it. The most of my circuits are modifications of others circuits. This is the pure truth!

No much improvements there are in each circuit I have experimented, only search for the best system.

[Esteban]

Hi J_P.

This is the final schematic of old Zahori with modifications. Here isn't audio stage.

[J_Player]

Thank you esteban,

I recall now the big difference from zahori and Ivconic's old ion detector is the sample and hold circuit from the cmos switch. A very interesting idea where you could change sample parameters if you want.

It seems to me most of your experimenting works best when you look at the heterodyne mix frequency variations. I presume you find more sensitivity using this method like used in some AM radios instead of direct measuring a signal. This would explain why the carrier frequency would change the sensitivity and range, similar to how a conventional vlf metal detector will use different frequency to optimize different kinds of hunting.

My final question is about what you are sensing.
I don't think any kind of metal detector is able to sense metal. All detectors sense electric fields or magnetic fields, or sometimes capacitance that changes when metal is nearby. So they measure a secondary effect that changes in the signal they are receiving, and we make an inference that metal is causing the signal to change. We usually find we are right that metal is the cause when we recover the target.

In the case of conventional metal detectors, we sense variation in fields that are transmitted, or in induced fields that we measure with a Rx coil. My question is: Do you know what you are sensing in your more recent designs? Are you sensing the same variations in induced fields like a conventional metal detector? Or are you measuring some other phenomena passively without inducing any artificial field?

We have heard about very faint anomalies that could exist at the surface of the ground around a long time buried target. It seems to me that if you are locating these faint ground surface anomalies, then you might be actually measuring something else that is changed where these anomalies exist. Maybe existing electric atmosphere gradient, or existing natural EM frequencies in the VLF or ELF range. Or maybe something else like combined ground currents and atmospheric low frequencies.

Do you know which of these you are measuring with your test LRLs? Or is this still a mystery to you?

Best wishes,
J_P

[Esteban]

Hi J_P,

I'm convinced is an electric field around buried metals for long time. Is a kind of battery as refer FrancoItaly. Alonso teach in great part of the knowledge I have today. He show me in real detection what's happens, influences of atmospheric pressure, position respect the target, and many other things.

But also the magnetic field of the Earth suffers small deviation in places of buried metals.

Of course, he keep some secrets, and I respect him. But I discover other things myself.

We do this experiment for to be sure: Detect a X target and go with MD and put it over the target. Minutes ago, we retire the detector and the target isn't detectable or only is detectable at short distance. So, the oscillator of the MD anulls the field. "Eat the natural battery."

This is scientific job without mathematical tools, except measure of atmospheric pressure and some for the style.

The buried items you use for to test electronic LRL don't be used for to test MD.

Influence of the atmospheric pressure. Before rains, atmospheric pressure decreases and detection occurs more easyli. The pressure comprisses the phenomenom, and when atmospheric pressure is more low, the phenomenom reveals easyli. Is exactly as the people see a kind of light in treasure sites at night, in preference hours before rain. And this chemist phenomenom is liberated justly when atmospheric pressure is more low. This kind of phenomenom is well known by science, regarding emission of white light is sites of old bones. This light is produced by the phosphamine in the bones, who reacts with oxigen in the air.

Also, is a good oportunity for to define what is "halo".

I think that also regular MD will be more sensitive when atmospheric pressure is low, maybe better with targets buried for long time.