Lrl from Italy

[folharin]

thank you

[sakher]

Hello
Is This device can detect if the target was inside a box?

[taxma1981]

I think NOW

[mee]

hi dear franco
my device not worked
emeter TR1 is 8Mhz signal .
baise TR2 is not signal .
and i test diffrent LC tank resonance between 100Khz to 140Mhz but my device not worked
pcb (( pcb file upload here ,with altume designer ))and all parts is ok
so i make device with 4069 pll but not worked.
i dont no
help mee
best regards

[brs]

Hi Franco
Is it possible to amplify this phenomenon transmitter Should separate transmitter receiver


http://store1.up-00.com/2016-11/1478940511511.png

[mee]

Hi all
Oscillator waves output in the oscilloscope not symmetrical if used this circuit for oscillating
Output wave is better
Best regards

[FrancoItaly]

Hi all,
I will post again a few tips that I have given above, I recommend the quartz version, simpler to build and debug. The oscillator is a Colpitts without the emitter capacitor which it has proved not necessary but that you can put in the event that the stadium is not in oscillation. The signal at 8MHz based on TR2 is so small that in practice it is not measurable, it is best to measure the DC output on the TR5 emitter.

Best Regards

[mee]

Tanks dear franco
I check it

[pigeon]

Originally Posted by mee

Hi all
Oscillator waves output in the oscilloscope not symmetrical if used this circuit for oscillating
Output wave is better
Best regards

[zakari]

thanks alot my dear franco

[dream_man]

Hello dear Franco;
Hope you are well and your face is smiley. Just to inform you, I prepared several tests on my test field which contains of several copper coins in 30cm depth, the circuit revealed nothing, but in my friend's test field which contains more than 1Kg coppers in 1 meter depth buried for several years, your circuit revealed it by 1 LED in 1 meter distance. Hope it's helpful.

[FrancoItaly]

hi dream man,

This is useful, you can try to extend the antenna and raise the gain, in sensor stage and in the display stage.

Best Regards

[dream_man]

Hi. All the changes applied and the result is what I mentioned above.

[sakher]

how i can raise the gain in sensor stage?

[folharin]

Friend dream man, in his project, which color led detected the phenomenon?

[dream_man]

Hi my friend, it depends on what color you use for LED IC1. I mean the first LED connected to IC1.

[FrancoItaly]

Hi sakher,

Look at my helps, if you follow my instructions you will set the stage for maximum sensitivity.

[sakher]

Thank you Mr. Francoitaly

[zakari]

hi dear franco

i made your lrl and i have 5.14v in out put and i touch the antenna voltage drop down only 20mili volt

is this correct ?

thanks for your help

[zakari]

dear franco

first i disconnect the xtal out put was 5.07 and sensor working vice versa i touched the antenna voltage drop up to 5.1v then i decrease c13 to 470pf and c14 to 390pf out put was been zero and connect the xtal c2=c3=c4=1pf

out put voltage is 5.14v now

if i touch the antenna voltage decrease to 5.12v

is this correct or no?

[FrancoItaly]

It's correct, the important thing is that there are no auto oscillations and obtaining the maximum amplification.

[PanosP]

I greet the members of the forum ...
I ask forgiveness for my English ...
After trying enrolled in forums ...
My turn and I publicly thank Franco to manufacture.
I am an amateur in electronics and maybe I can not give precise information
to the members who they asked me in my email
But I can upload my work and experiments I did and maybe some help ...

https://postimg.org/image/jord1udjp/
https://postimg.org/image/yfll52yqn/
https://postimg.org/image/bsu4hujnt/

[PanosP]

I made many boards always 2 pieces to end up in the Franco project with two copper sides of the receiver, but I put the ground at the bottom.
Stis trials I 1 lrl 6 capacitors of C10 from 18p to 47p and a lrl with 12 capacitors
from 18p to 1n to some I caught metals or some of the other nothing.
while at home the signals caught by 8-9 m. the tester to 4-5 meters.

https://postimg.org/image/6lfvb7v9f/
https://postimg.org/image/jlz2rj9il/

https://www.youtube.com/watch?v=tyDgBLH_2Bg

6 capacitors

https://postimg.org/image/ri4l7gox1/
https://postimg.org/image/q37x4seor/

12 capacitors

https://postimg.org/image/70nxtlgur/
https://postimg.org/image/q8k4p7bn7/

https://www.youtube.com/watch?v=ib72FWjxYTw

[pigeon]

THANK YOU VERY MUCH

Originally Posted by PanosP

I made many boards always 2 pieces to end up in the Franco project with two copper sides of the receiver, but I put the ground at the bottom.
Stis trials I 1 lrl 6 capacitors of C10 from 18p to 47p and a lrl with 12 capacitors
from 18p to 1n to some I caught metals or some of the other nothing.
while at home the signals caught by 8-9 m. the tester to 4-5 meters.

https://postimg.org/image/6lfvb7v9f/
https://postimg.org/image/jlz2rj9il/

https://www.youtube.com/watch?v=tyDgBLH_2Bg

6 capacitors

https://postimg.org/image/ri4l7gox1/
https://postimg.org/image/q37x4seor/

12 capacitors

https://postimg.org/image/70nxtlgur/
https://postimg.org/image/q8k4p7bn7/

https://www.youtube.com/watch?v=ib72FWjxYTw

[Arionas]

Originally Posted by PanosP

I made many boards always 2 pieces to end up in the Franco project with two copper sides of the receiver, but I put the ground at the bottom.
Stis trials I 1 lrl 6 capacitors of C10 from 18p to 47p and a lrl with 12 capacitors
from 18p to 1n to some I caught metals or some of the other nothing.
while at home the signals caught by 8-9 m. the tester to 4-5 meters.

https://postimg.org/image/6lfvb7v9f/
https://postimg.org/image/jlz2rj9il/

https://www.youtube.com/watch?v=tyDgBLH_2Bg

6 capacitors

https://postimg.org/image/ri4l7gox1/
https://postimg.org/image/q37x4seor/

12 capacitors

https://postimg.org/image/70nxtlgur/
https://postimg.org/image/q8k4p7bn7/

https://www.youtube.com/watch?v=ib72FWjxYTw

Panos P