Lrl from Italy

[Jeg]

Originally Posted by humhum

Two coil for more small cap .

niccce humhum!


I used the first technique recently (speaker wire) and its really very convenient.

[folharin]

I did all the franco circuits. Here in Brazil it doesn't work, not even in the test field...:n?o n?o::carranca:

[Jeg]

Originally Posted by folharin

I did all the franco circuits. Here in Brazil it doesn't work, not even in the test field...:n?o n?o::carranca:

Hi folharin

How old is your test field?
What indication method did you pick up for your receiver?
Have you tested a voltmeter in place of leds?
Can you share how did you confirm that your device is built successfully?
Do you own an oscilloscope?

Thanks

[humhum]

Originally Posted by folharin

I did all the franco circuits. Here in Brazil it doesn't work, not even in the test field...:n?o n?o::carranca:

For your country You can use FM Receive method and frequency of big master Esteban .

[tasmen]

Hi Mr Franco

I created version on 20Mhz (crystal 14Mhz). How can adjust to pot 1,2,3 and c10 to get the maximum performance to one harmonic?
I have not oscilloscope.
I can measure volts at the output?
The value i have to get?

Thank you in advance.

[FrancoItaly]

Originally Posted by tasmen

Hi Mr Franco

I created version on 20Mhz (crystal 14Mhz). How can adjust to pot 1,2,3 and c10 to get the maximum performance to one harmonic?
I have not oscilloscope.
I can measure volts at the output?
The value i have to get?

Thank you in advance.

Measurements must be made at the sensor stage output (direct voltage). C10 needs to be adjusted for maximum output. Obviously you have to follow the instructions of the helps, no signal must be there without the quartz and others.

[brain]

hello franco lrl, is it electrostatic or electromagnetic, can I get some information?

[FrancoItaly]

Originally Posted by brain

hello franco lrl, is it electrostatic or electromagnetic, can I get some information?

I think it's electromagnetic, I can't tell you more.

[ERDOGAN37]

https://youtube.com/shorts/4oYFSPlzWvc?feature=share

Thanks Franco

[FrancoItaly]

Originally Posted by ERDOGAN37

https://youtube.com/shorts/4oYFSPlzWvc?feature=share

Thanks Franco

Which version of my lrl did you make?

[ERDOGAN37]

LRL 2 project

[FrancoItaly]

Originally Posted by ERDOGAN37

LRL 2 project

20 Mhz ?

[ERDOGAN37]

yes 20 mhz

[mustefa ubram]

I finished the version 20mhz today.I have not tested in practice yet.But in practice it works like version 8mhz.With 22 pf capacitor, the output of the sensor is 5 volts dc.Touching the telescopic antenna reduces the output between 300 and 700 mV.I connect the sensor output to a 32-bit microcontroller.The measurement accuracy with the 32-bit microcontroller is very high and the smallest change is displayed.Currently I am facing a real test location challengePlease guide me in this regard

[FrancoItaly]

The 20 Mhz version is certainly more sensitive than the 8Mhz version because L1 / C10 is tuned on a 20 Mhz harmonic. To check correct operation, the rule is the same as the 8 Mhz version, that is, test on the test field.

[folharin]

I don't understand why this detector fails to manufacture it? honestly it doesn't work!

[folharin]

I have the proving ground and this detector really didn't work!!

[folharin]

newcomers to the group!search for alonso pd

[folharin]

two boxxxx

[Pahom]

Originally Posted by folharin

I have the proving ground and this detector really didn't work!!

Try to pick up a capacitor parallel to the coil. And with the coil itself 3-4-5-6-7 turns. Or squeeze or stretch the turns of the coil to try on the track with the target.

[omar]

Hi Franco. What technology does the device use, is it BFO? The fact that there are two resonant circuits that have a harmonic frequency. When the device enters an electric or magnetic field, the resonance frequency changes by a difference of audible sound frequencies. With a low-pass filter with a cut-off frequency of 480Hz, a wide band. Is this the case?

[FrancoItaly]

Originally Posted by omar

Hi Franco. What technology does the device use, is it BFO? The fact that there are two resonant circuits that have a harmonic frequency. When the device enters an electric or magnetic field, the resonance frequency changes by a difference of audible sound frequencies. With a low-pass filter with a cut-off frequency of 480Hz, a wide band. Is this the case?

There is only one resonant circuit, L1 / C10, and it resonates in the FM range, the internal oscillator (quartz) provides a reference signal for the TR2 mixer, if L1 / C10 is tuned on a quartz harmonic the sensitivity is higher . You cannot compare the operation of this lrl to a metal detector, it is a passive receiver, but you could add an external oscillator (FM range). This is not a simple modification, without good shielding the external oscillator would saturate the sensor stage. I would also add that we do not know much about the phenomenon.

[Asheikh]

Originally Posted by FrancoItaly

There is only one resonant circuit, L1 / C10, and it resonates in the FM range, the internal oscillator (quartz) provides a reference signal for the TR2 mixer, if L1 / C10 is tuned on a quartz harmonic the sensitivity is higher . You cannot compare the operation of this lrl to a metal detector, it is a passive receiver, but you could add an external oscillator (FM range). This is not a simple modification, without good shielding the external oscillator would saturate the sensor stage. I would also add that we do not know much about the phenomenon.

Hello
Before every thing, Thanks for your excellent circuit Mr Franco.
It seems your circuit isn't a passive device & it transmits harmonic signal to the Ant. through C2 & C9.
Gold & Silver are not radioactive metals & I think they haven't Phenomena from themselves.
I'm not a pro. engineer & perhaps in mistake.
Thanks

[FrancoItaly]

Originally Posted by Asheikh

Hello
Before every thing, Thanks for your excellent circuit Mr Franco.
It seems your circuit isn't a passive device & it transmits harmonic signal to the Ant. through C2 & C9.
Gold & Silver are not radioactive metals & I think they haven't Phenomena from themselves.
I'm not a pro. engineer & perhaps in mistake.
Thanks

I confirm that my lrl is a passive receiver and in my opinion radioactivity is not the only phenomenon involved, I also confirm and many members have verified it, that my lrl is also sensitive to gold and silver. It is also true that in some places it does not work, here is the link of a video:

https://www.youtube.com/watch?v=yR3tzT2Jd-g&t=34s

[omar]

....... Thank you