Lrl from Italy

[Milad.salsa]

hi franco very tnx for publish your project .
i have a queistion,can your circuit sense a metal in 2meter or more under ground???(depth)
because i sense metel in 60cm or less

[FrancoItaly]

The operating principle of lrls is that a metal (non-ferrous) buried for some time emits a kind of signal (which we call "phenomenon") that can be revealed to dozens of meters away and (I suppose) to several meters of depth . The greater the burial time the greater the distance and depth to which it can be revealed. I think a 200 or 300-year-old buried metal can be revealed by a lrl to a few meters in depth, but I think the depth also depends on other causes, such as terrain and maybe even atmospheric conditions. The phenomenon can also be revealed to about 2 meters above the ground.

[Milad.salsa]

thank you franco you are a great man.i test your circuit in a place that mw wave was very low and your circuit dont worked then i test it in a place with mw wave and your circuit worked very good.now this circuit work by radio wave?

[Hadi]

The operating principle of lrls is that a metal (non-ferrous) buried for some time emits a kind of signal (which we call "phenomenon") that can be revealed to dozens of meters away and (I suppose) to several meters of depth . The greater the burial time the greater the distance and depth to which it can be revealed. I think a 200 or 300-year-old buried metal can be revealed by a lrl to a few meters in depth, but I think the depth also depends on other causes, such as terrain and maybe even atmospheric conditions. The phenomenon can also be revealed to about 2 meters above the ground.

Hi dear Franco
For long time buried your system can be revealed metal about 20 meters.
Thanks

[FrancoItaly]

thank you franco you are a great man.i test your circuit in a place that mw wave was very low and your circuit dont worked then i test it in a place with mw wave and your circuit worked very good.now this circuit work by radio wave?

Hi Milad.salsa,

What do you mean by mw wave? Surely the input circuit is tuned around 100Mhz, fm range. It's interesting to know the frequency you've noticed.

Best Regards

[FrancoItaly]

Hi dear Franco
For long time buried your system can be revealed metal about 20 meters.
Thanks

Hi Hadi,

You mean you found a metal 20 meters away?

Best Regards

[Hadi]

Hi Hadi,

You mean you found a metal 20 meters away?

Best Regards

The system is available to doing this performance.

B.R

[kaligula]

Error

here my pcb files
its 2bl side ( one side as franco said ground )
i put each component where to have the least effect to other one . becuase of its ground it have to much low noise .
what do you think dear franco . need any changes ??
sry for my english Untitled.jpg

This pcb has error at first sight, 7812 is shorted

[kaligula]

NICE JOB

Where I can found this display pcb layout

[kaligula]

This pcb has error at first sight, 7812 is shorted

Its OK, I found corected pcb

[ford]

p1&p2

Can I use p1=20k and p2=500k in 3led display stage ?
I haven't 22k&470k potentiometer.

[kaligula]

Can I use p1=20k and p2=500k in 3led display stage ?
I haven't 22k&470k potentiometer.

I think it's ok, it's not a big difference

[kaligula]

Does anyone have made it with this pcb?

[ford]

When I touch antenna, led turn on and voltage increase!
What is problem?
Output voltage is between 5 V and 6 V.

[FrancoItaly]

Sometimes it has also happened to me, the test simply serves to determine if, by touching the input, there is some change in output. This way we are sure that no stage is in saturation or inhibition. The only reliable test is with a metal that has been buried for some time.

Best Regards