mineoro fg/90

[abdou2014]

Hi dear forum members, I added an oscillator to my FG90, connected to a small 100mH inductor, it can react to an aluminum foil at 35 cm, I need the opinion of Geo and J-player , I hope to have a fast answer , thank you .

[abdou2014]

I added a TDA7000 connected to the magnetic receiver at the IN point, very sensitive to static charge, but a decrease in sensitivity of the magnetic loop ,
what is the ideal voltage at the IN point without having a decrease in sensitivity ???

[Dubulumach]

abdou2014 send me schematic of your FG-90 and PCB pictures at both side of device. Upload at some Iranin host site and send me a link privately here at mailbox. I will see, could I help you with your RF-sniffing mod. OK ? There are many "underwather reefs" which must be taken to the account if you want to work it properly and detect the gold.



The problem you have is magnetic cross-coupling. Could be solved. Need more info.
Regards !

[abdou2014]

thank you very much dear friend, you gave me hope, tomorrow I will take pictures and send them to you

[abdou2014]

THERE IS NO JFET AT THE MAGNETIC INPUT

[abdou2014]

The excitation of the sample generates two fields which will be absorbed by ...............
we can improve it easily

[humhum]

Hi , I build my PDC210 before 10 years , it works only with Ionic sensor ,
but Original Mineoro have also Magnetic Receiver for localisation and pinpoint , here Magnetic
receiver need very fine calibration so like Pistol Detector .
Not is easy .

[abdou2014]

If you want us to help each other and share diagrams and informations, tell me

[abdou2014]

FG90

[abdou2014]

Hello dear members of this forum, I noticed after several experiments and modifications on the mineoro magnetic receiver that it is necessary to increase the inductance of the ferrite cores and to add a preamplifier, this makes the receiver ultra stable and sensitive, I was able to receive any VLF signals from 1500KM distance at any altitude level even in underground caves.

[Yusufyaba]

hello abdou
I'm glad you were successful in your project.
Can you tell us about the working logic of fg90, for example frequency range, sensor stage, materials in the sensor or input, development, how the result is formed and similar diagrams?
thanks

[Geo]

Originally Posted by humhum

Hi , I build my PDC210 before 10 years , it works only with Ionic sensor ,
but Original Mineoro have also Magnetic Receiver for localisation and pinpoint , here Magnetic
receiver need very fine calibration so like Pistol Detector .
Not is easy .

FG80 has better receiver and more easy to tune it. The only problem is the righ Pot-core

[abdou2014]

WHAT'S THE RIGHT POT-CORE Mr GEO ?

[abdou2014]

IF YOU MEAN IP6 / 2000 . I DIDN'T HAVE A GOOD RESULTS WITH IT .

[Geo]

IP6 / 2000 is very good.
I took good results only when Al was 400 or more.

[Baterista]

https://www.longrangelocators.com/fo...1&d=1701187528

[Geo]

Very good

[Dubulumach]

In Electronics must'n be belivers and dreamers. Only real things are valid measurements and calculations.

[Dubulumach]

Originally Posted by abdou2014

FG90

Post full pcb and schematic you already have. No one can make a pcb withouth schematic.
And high resolution pictures of your FG90 pcb both sides would be fine.Than we would make conclusions what should be modified and how it would be.


Regards

[Geo]

Originally Posted by Dubulumach

In Electronics must'n be belivers and dreamers. Only real things are valid measurements and calculations.

I agree.
All the art is the formula L=Al x turns^2