Lrl from Italy

[ERDOGAN37]

LRL 2 project

[FrancoItaly]

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]

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]

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]

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]

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