Lrl from Italy

[jocelito]

Nelson according to this coil is calculated online 628uH capacitor with 6.8 N frequency 77kh

http://www.energylabs.com.br/el/calculadora/lccalc

[Nicolas]

Hi fanco here is your LRL. I make PCB to improve it and try to land with some modification on the choice of the frequency search.

And I give you the PCB to do and try.

[FrancoItaly]

Hi Nicolas
Great work, at the moment I'm in Switzerland and I cannot test your pcb, but remember that the "secret" of my pcb is the double face, at the bottom there are 6 strip, one strip is in corrispondance with the TR3 collector and another strip is in corrispondance with the TR1 base, this causes a capacitive coupling of very few pF and then the stage becomes to oscillate. If with your pcb you have at the output a DC voltage of about 2-4v and the voltage drops when you touch the input then the lrl is working. The "phenomenon" increases the output voltage. My pcb is very critic and the inferior strips must be aligned with the superior strips but obviously the superior strips are cut properly to achieve the links between the components.

Best Regards

[Nicolas]

Hi Nicolas
Great work, at the moment I'm in Switzerland and I cannot test your pcb, but remember that the "secret" of my pcb is the double face, at the bottom there are 6 strip, one strip is in corrispondance with the TR3 collector and another strip is in corrispondance with the TR1 base, this causes a capacitive coupling of very few pF and then the stage becomes to oscillate. If with your pcb you have at the output a DC voltage of about 2-4v and the voltage drops when you touch the input then the lrl is working. The "phenomenon" increases the output voltage. My pcb is very critic and the inferior strips must be aligned with the superior strips but obviously the superior strips are cut properly to achieve the links between the components.

Best Regards

Hi Franco good travel and retur
It is clear my brother. You are actually smart enough
Good truck really. I really noticed that when I touch the antenna with my fingers.
I understand your explanation thank you Franco. can you tell me the interval between the strips (mean bands) and their widths

Thank you so much for your suggestion. (mean this) ---| |--- >>> C = ..few.... pF

[nelson]

Joselito

I think you are right, cause in my case i calculated 820 uH, but with lower capacitor values. Has this is an LC circuit, what it matters, is to get the resonant frequency between 55 Khz to 110 Khz

Regards
Nelson

Nelson according to this coil is calculated online 628uH capacitor with 6.8 N frequency 77kh
http://www.energylabs.com.br/el/calculadora/lccalc

[FrancoItaly]

Hi Nicolas
I'haven't designed this pcb for this purpose, but I used an older pcb (that I designed as antenna for another Lrl) and at the beginning I wanted to build a RF sniffer in FM range as front end stage of my Lrl. This circuit works well as lrl but not as amplifier but as oscillator. I post here again my pcb where the pcb is also in its real dimensions. I have not really measured the capacity between strips. Try (with your pcb) a small capacitor ( 1 pF or less ) between TR3 collector and TR1 base, perhaps maybe you'll get lucky and can get an oscillation.

Best Regards

[youssef]

hi

Dear Franco:
Waiting for more pictures of close-circuit and video if possible.
And how we can use variable frequency by country in which we live.
The batteries used what voltage is it? I put a picture attached and I hope to clarify what there is inside the circle.
I ask you to forgive me for I am new in this regard.

[matrix]

Hi all
many thanks to You Francoitaly for publishing your knowledge here.
perfect PCB nicolas , thank You , but where is L1 ? may it be separate from PCB? or is forgotten on your design?

All the best
matrix

[FrancoItaly]

Hi All
I think that the frequency isn't important and depends on the characteristics of the circuit, it's around 5Mhz. Inside the circle there is L1. You must remember that the Lrl is a passive receiver/converter, It transforms the "phenomenon" by modulating an existing signal (the 5Mhz oscillator). As I said before I'm not sure that Nicoals' pcb works well because in my pcb the oscillations are generated by a parasite link from TR3 collector and TR1 base. If the oscillations are between TR3 and TR2 the "phenomenon" cannot influence the oscillator. I spent a lot of time to try to understand this circuit, other types of oscillators don't work.

Best Regards

[Nicolas]

Hi all
many thanks to You Francoitaly for publishing your knowledge here.
perfect PCB nicolas , thank You , but where is L1 ? may it be separate from PCB? or is forgotten on your design?

All the best
matrix

Hi matrix thanks

the placement for L1 is betwenn J1 and J3 look here

[Nicolas]

Hi Nicolas
I'haven't designed this pcb for this purpose, but I used an older pcb (that I designed as antenna for another Lrl) and at the beginning I wanted to build a RF sniffer in FM range as front end stage of my Lrl. This circuit works well as lrl but not as amplifier but as oscillator. I post here again my pcb where the pcb is also in its real dimensions. I have not really measured the capacity between strips. Try (with your pcb) a small capacitor ( 1 pF or less ) between TR3 collector and TR1 base, perhaps maybe you'll get lucky and can get an oscillation.

Best Regards

Hi dear Franco I put between Tr1 and Tr3 value of capacitor 1 ..to. 3 pF is good

But on the DC output is between 7 and 9.88V and not 2 to 4V. Yes oscillation is

I put that later because now I have problem with ISIS.

[mustefa ubram]

Dear Franco:
Waiting for more pictures of close-circuit and video if possible.
And how we can use variable frequency by country in which we live.
The batteries used what voltage is it? I put a picture attached and I hope to clarify what there is inside the circle.
I ask you to forgive me for I am new in this regard.

I believe that this circuit does not work.frq is hight .




We need to lower frequency about 20khz

[FrancoItaly]

Hi Nicolas
You have to lower the value of the capacitor C5 (330 pF or 270 pF) or the capacitor C7 (470 pF) then adjust the variable capacitor C6 for 2-5V at output, the important thing is that output is not saturated. Remember that few picofarad are sufficient to bring the output from zero to max voltage.

For mustefa ubram
The circuit works very well with this frequency (only with this frequency). The battery are 2 X 9V battery for 18V power.

Best Regards

[Geo]

Hi Franco.
I believe that this schematic works very good at your area, but don't work at my field test. I afraid that "phainomenon" is not strong at my area. Also Alonso's PD, PDK, Mineoro Fg80, DCH 85 etc don't catch the phainomenon. Only a modificated MFD by Andy flind catch it a little.
Maybe i must try at other areas.

Regards

[Nicolas]

Hi Franco.
I believe that this schematic works very good at your area, but don't work at my field test. I afraid that "phainomenon" is not strong at my area. Also Alonso's PD, PDK, Mineoro Fg80, DCH 85 etc don't catch the phainomenon. Only a modificated MFD by Andy flind catch it a little.
Maybe i must try at other areas.

Regards

Hi Geo Italy or Grece is the same region almost no big difference.

Yes this shematic i think work good and better.
I want to try to see change with the frequency of detection of each metal Detected