Lrl from Italy

[FrancoItaly]

No, there is only one power, 12V, that goes to sensor stage and to display stage. The only way to test PCB is to follow every track and make sure it complies with the wiring diagram.

[Hadi]

Hi Franco,
I have an idea. Can we use A/D uc and LCD display instead of display stage. That can to detect low signal from sensor stage.

[FrancoItaly]

It's a good idea, I built two lrls with 10 LEDs, for one I used a LM3914 and for the other I used a PIC16F88 but I think that the LM3914 it's the best choice. With 1 LED version you must connect the IC3A output to LM3914 input and change the inputs, that's output of sensor stage to non inverting input of IC3A and the cursor of P2 to R10. However, even the version with 3 LEDs works well, although less accurate.

[Hadi]

Thank you so much Franco.
I will try to reach best result and I'll send you hex file.
By the way how much the max voltage is in output of sensor stage? (I mean when 3 LED's are on)

[FrancoItaly]

The max voltage (theoretical) at output sensor stage it's about 8V. If without target signal the output is (for example) 4V we may suppose with a very large signal an output of 5V, that's 1V range, this range is amplified by the first operazional. If we suppose a gain of 6 the range at operational output it's (for example) 2 - 8V or 0 -6V.

[Hadi]

Thanks for your kindly guide.

[abdou2014]

is it more easy to get the center of target with your lrl than the vlf receiver lrl ?

[FrancoItaly]

I don't know the vlf/lrl, but in general the lrls are not able to make a pinpoint of the target as the VLF metal detectors, but the signal increases approaching the target and disappears completely right above the target.

[abdou2014]

is there a trick to determining target location. at what distance from target the signal disappears ? and is it necessary to be facing south direction ?

[abdou2014]

Franco LRL with True RMS

[FrancoItaly]

As I said signal disappears completely right above the target. Direction Nord/South or East/West it's not important for pinpoint.

[mustefa ubram]

hi to all.
hi franco .how are you?i miss you
I'm back after a long delay.I want to start rebuilding project Franco.I forgot a lot of information about the project.
dear franco :i have many question.please reply
When placed non-ferrous metals in the soil for a long time .What events or changes occur for electromagnetic state of the soil?

[FrancoItaly]

Hi mustefa ubram,
I'm fine, but I'm always in Switzerland close to my wife who is ill and therefore can not make any proof with my LRL. I do not have a valid theory on the phenomenon, but I think the important thing is that the phenomenon exists and can be revealed, the next step would be to distinguish gold from other metals. I appeal to all those who want to make changes to my LRL and I say that as the first thing must be able to operate the LRL on the ground with metal buried for at least a few weeks and only after they can think about changes.

Best Regards

[abdou2014]

Mr franco is that the frequency varies between countries, and what is the source of this signal, VLF transmitter station or natural magnetic field of earth ?

[mustefa ubram]

Originally Posted by FrancoItaly

Hi mustefa ubram,
I'm fine, but I'm always in Switzerland close to my wife who is ill and therefore can not make any proof with my LRL. I do not have a valid theory on the phenomenon, but I think the important thing is that the phenomenon exists and can be revealed, the next step would be to distinguish gold from other metals. I appeal to all those who want to make changes to my LRL and I say that as the first thing must be able to operate the LRL on the ground with metal buried for at least a few weeks and only after they can think about changes.

Best Regards

I wish health for your wife

[mustefa ubram]

NEW PCB OF CRYSTAL LRL

[FrancoItaly]

watch these videos:

https://www.youtube.com/watch?v=lp35Ly8Cw1Q

https://www.youtube.com/watch?v=BUzyKuUQExE

https://www.youtube.com/watch?v=BQfyqmgCdcY

I ask Panos Pappas few details on the type of metal and even distance is revealed. To Mustefa I said: good work.

[mustefa ubram]

Originally Posted by FrancoItaly

watch these videos:

https://www.youtube.com/watch?v=lp35Ly8Cw1Q

https://www.youtube.com/watch?v=BUzyKuUQExE

https://www.youtube.com/watch?v=BQfyqmgCdcY

I ask Panos Pappas few details on the type of metal and even distance is revealed. To Mustefa I said: good work.

Thank you franco
please send me panos pappas email in prvate message

[abdou2014]

Good work mustefa , do you have eagle or proteus file to share with us

[mustefa ubram]

Originally Posted by abdou2014

Good work mustefa , do you have eagle or proteus file to share with us

sorry dear freind
i have altume format .

[abdou2014]

I never work with it , would you like to share just for have an idea , thanks

[pigeon]

HI ALL FRIEND

how I can use two antenna Franco lrl 3 leds?

thank you for all

[pigeon]

Originally Posted by pigeon

HI ALL FRIEND

how I can use two antenna Franco lrl 3 leds?

thank you for all

emplacement to fixed two antenna

[FrancoItaly]

2 or 3 antennas are connected togheter and we have more sensibility, but even if we stretch the antenna, for example, from 30 to 50cm or 60cm, we have a sensitivity increase. However often also the compass effect increases.

[pigeon]

Originally Posted by FrancoItaly

2 or 3 antennas are connected togheter and we have more sensibility, but even if we stretch the antenna, for example, from 30 to 50cm or 60cm, we have a sensitivity increase. However often also the compass effect increases.

THANK YOU