Lrl from Italy

[brain]

hello franco what is the gold and silver phenomenon values ​​under the ground? Is it possible for you to provide information on this subject?

[FrancoItaly]

hello franco what is the gold and silver phenomenon values ​​under the ground? Is it possible for you to provide information on this subject?

Unfortunately I don't have these data, official science doesn't recognize the phenomenon, I can only tell you that personally (like other forum members) I believe in its existence, having built and used tools that prove it. It is a complex phenomenon that acts on a wide range of frequencies and therefore it is possible to build instruments that rely on different frequencies. For now I have not been able to establish whether the phenomenon is the same for each type of metal and therefore there is a possibility of discrimination. Iron is certainly not detected and this is a nice plus.

[brain]

Actually I have a specially made device .33khz sine wave is applied to the ground with two cables laid on the ground. There is a tda2030 audio output circuit. only amp values are changed. The receiver part is divided into 3 with a 3-step switch and fine-tuned with a potentiometer. Between 16khz and 19khz between 19khz and 22khz between 22khz and 26khz. There is no connection between the receiver and the transmitter. The antenna in the receiver is about 40 cm long. a coil is wound on a core as an antenna.

[FrancoItaly]

Actually I have a specially made device .33khz sine wave is applied to the ground with two cables laid on the ground. There is a tda2030 audio output circuit. only amp values are changed. The receiver part is divided into 3 with a 3-step switch and fine-tuned with a potentiometer. Between 16khz and 19khz between 19khz and 22khz between 22khz and 26khz. There is no connection between the receiver and the transmitter. The antenna in the receiver is about 40 cm long. a coil is wound on a core as an antenna.

I think it is a system derived from geophysics.

[FrancoItaly]

I have improved the performance of my lrl, I cannot say exactly how much, as I no longer have the original test field available, however in my current land there is a point where the original lrl signaled a weak signal right nearby, instead with the modification there is a fairly strong signal at about 2 m. The modification essentially consists of increasing the frequency of the quartz to 20 Mhz and of tuning L1 / C10 on a harmonic frequency of the quartz. In addition, I made R10 as trimmer to vary more easily the gain of the sensor stage. I have also improved the display stage by putting a fine adjustment and a coarse to make tuning easier. In this way it is possible to "lock" the output voltage of the sensor stage for a wide voltage excursion. The oscillator circuit has been modified to obtain a waveform as distorted as possible, furthermore the frequency of the quartz has been increased to 20Mhz. In this way, harmonics are also generated, one of which (I suppose the 4th or 5th) is tuned with the resonant circuit L1 / C10. For this reason C10 is now a variable capacitor. I also attach the diagram of the power stage. However, any circuit that provides stabilized 12 V is fine. In my diagram I have put a red led that flashes when the voltage drops below 15.5 V. I also enclose a new "help". It is almost essential to have an oscilloscope available, in fact the values of the oscillator components vary greatly depending on the type of quartz,there are types of quartz harder than others to make oscillation. The calibration of the sensor stage serves to obtain the maximum gain without having oscillations.

[FrancoItaly]

I modified the help, in fact I realized that if the oscillator signal is too wide, it is difficult to set up as the signal reaches the base of TR2 also due to parasitic coupling.

[behnamvp]

good day

Mr.franco Italy
thank you for sharing project and helping others

don't know if someone asked or no but why you don't use ready oscillator
instead of crystal?
because running high frequency xt is a little bit hard at least at no projects i had success
so, i always use ready oscillators except projects that XT runs by microcontrollers.
i think many members that built your L.R.L also couldn't run XT but they don't know

thank you

https://s16.picofile.com/file/8428541100/xt_active.jpg

[FrancoItaly]

good day

Mr.franco Italy
thank you for sharing project and helping others

don't know if someone asked or no but why you don't use ready oscillator
instead of crystal?
because running high frequency xt is a little bit hard at least at no projects i had success
so, i always use ready oscillators except projects that XT runs by microcontrollers.
i think many members that built your L.R.L also couldn't run XT but they don't know

thank you

https://s16.picofile.com/file/8428541100/xt_active.jpg

You are right, you could also use the "ready oscillators", but I find that the quartz version is the simplest, even most oscillates even without the capacitor between the emitter and the base of the transistor, in the range 2 - 10 Mhz in my opinion is the best choice. The same scheme also works with 20 Mhz, but it is more critical, also because we are at the frequency limit for quartzes that work in fundamental (harmonic). Furthermore it is necessary to have a waveform as distorted as possible, to have many harmonics and a signal of small amplitude in order not to radiate towards the sensor stage.

[ali02]

Hi FrancoItaly
I made your LRL with SMD components, but I don't know how much to tune the potentiometer screws to adjust it? (I'm looking for gold)
But sometimes when I tune the potentiometers, and walk to the refrigerator door, the LED lights up and the speaker beeps, and when I walk away from the refrigerator, the lights go out and the speaker does not beep!
Also, when I walk to the place where the toilet well has been dug, the lights and speakers turn on!
Does this device detect a magnetic field or ions?
Best Regards

[FrancoItaly]

Hi FrancoItaly
I made your LRL with SMD components, but I don't know how much to tune the potentiometer screws to adjust it? (I'm looking for gold)
But sometimes when I tune the potentiometers, and walk to the refrigerator door, the LED lights up and the speaker beeps, and when I walk away from the refrigerator, the lights go out and the speaker does not beep!
Also, when I walk to the place where the toilet well has been dug, the lights and speakers turn on!
Does this device detect a magnetic field or ions?
Best Regards

I don't know (and I don't know if there is) a frequency just for gold. It is normal for there to be many sources of disturbance in the home. Very little is known about the phenomenon, indeed according to "normal" science it does not exist. In my opinion, since it works with an antenna, it is an electromagnetic field.

[FrancoItaly]

I would like to warn those who intend to make the 20Mhz version of my lrl to wait because, while the first one works perfectly, the other two, which I did later, have problems with signal instability. I am making substantial changes and think I have solved the problem. I will post the changes as soon as possible.

[bahrymed]

Good luck mister franco
waiting for your new lrl

[Pahom]

You are right, you could also use the "ready oscillators", but I find that the quartz version is the simplest, even most oscillates even without the capacitor between the emitter and the base of the transistor, in the range 2 - 10 Mhz in my opinion is the best choice. The same scheme also works with 20 Mhz, but it is more critical, also because we are at the frequency limit for quartzes that work in fundamental (harmonic). Furthermore it is necessary to have a waveform as distorted as possible, to have many harmonics and a signal of small amplitude in order not to radiate towards the sensor stage.
Good afternoon Franco! Reading about a new project at 20 MHz, you constantly repeat that the waveform at the output of the generator should be DISTORTED as much as possible. Is this so or is it a translation error?

[FrancoItaly]

Good afternoon Franco! Reading about a new project at 20 MHz, you constantly repeat that the waveform at the output of the generator should be DISTORTED as much as possible. Is this so or is it a translation error?

It is not an error, a distorted signal means that it contains harmonics of higher frequency, in our case: fundamental = 20Mhz, second harmonic = 40Mhz, third = 60Mhz, fourth = 80Mhz, fifth = 100 Mhz, always with decreasing amplitude. The L1 / C10 resonant circuit is tuned to one of these harmonics (I think 80 Mhz or 100 Mhz) and this makes the sensor stage more sensitive.

[Pahom]

It is not an error, a distorted signal means that it contains harmonics of higher frequency, in our case: fundamental = 20Mhz, second harmonic = 40Mhz, third = 60Mhz, fourth = 80Mhz, fifth = 100 Mhz, always with decreasing amplitude. The L1 / C10 resonant circuit is tuned to one of these harmonics (I think 80 Mhz or 100 Mhz) and this makes the sensor stage more sensitive.
Thanks! Another question, in the circuit display 1, the capacitor c1 is indicated 10mf is it an electrolyte? The previous version specified 0.22mF.

[FrancoItaly]

Thanks! Another question, in the circuit display 1, the capacitor c1 is indicated 10mf is it an electrolyte? The previous version specified 0.22mF.

C1 is 10 nF, in the previus version was 22 nF, however it is not very important, however too high values, 100 nF and more, can slow down the response, especially if you search with fast scans.

[Pahom]

C1 is 10 nF, in the previus version was 22 nF, however it is not very important, however too high values, 100 nF and more, can slow down the response, especially if you search with fast scans.
Thanks Franco! It remains to find out to what frequency to tune the input circuit L1 and C1, if I understood you correctly, then it should be approximately in the region of 80-100 MHz

[FrancoItaly]

Thanks Franco! It remains to find out to what frequency to tune the input circuit L1 and C1, if I understood you correctly, then it should be approximately in the region of 80-100 MHz

In the L1 / C10 resonant circuit, by varying the capacitance of the capacitor, we see the amplitude of the signal, at the output of the sensor stage, increase when a harmonic of 20Mhz is reached, and then decrease moving away from it.

[Pahom]

In the L1 / C10 resonant circuit, by varying the capacitance of the capacitor, we see the amplitude of the signal, at the output of the sensor stage, increase when a harmonic of 20Mhz is reached, and then decrease moving away from it.
You say c10 is the one on the TP3 collector

[Pahom]

As I understand it ..... you talked about a circuit with a quartz at 8 MHz, there in the circuit yes L1-C10. I asked you about the 20 MHz quartz circuit and there in the L1-C1 circuit. Thank you Franco, now I understand your explanation about harmonics.

[FrancoItaly]

As I understand it ..... you talked about a circuit with a quartz at 8 MHz, there in the circuit yes L1-C10. I asked you about the 20 MHz quartz circuit and there in the L1-C1 circuit. Thank you Franco, now I understand your explanation about harmonics.

The 20 Mhz lrl is a improvement of 8 Mhz lrl, C10 in the 8 Mhz sensor stage has been replaced with a variable capacitor.

[abdou2014]

Thank you dear friend :)

[brain]

https://ibb.co/p0XJ5pP
hello i designed franco 80mhz i will try .:)

[brain]

hello i designed franco 80mhz i will try .:)

[Pahom]

I would like to warn those who intend to make the 20Mhz version of my lrl to wait because, while the first one works perfectly, the other two, which I did later, have problems with signal instability. I am making substantial changes and think I have solved the problem. I will post the changes as soon as possible.
Good evening Franco! Did you solve the problem with signal instability?

[FrancoItaly]

Good evening Franco! Did you solve the problem with signal instability?

Not yet, but I understand that part of the problem is that on + 12V there is a very large signal at 20Mhz. With the 8Mhz lrl there were not all these problems.

[liudengyuand]

Is it really useful？

[FrancoItaly]

Is it really useful？

could be.

[liudengyuand]

Who knows in what range the inductance of 3 turns is?

[FrancoItaly]

Who knows in what range the inductance of 3 turns is?

I think less than 1 micro Henry.

[liudengyuand]

Your document mentions that the tr5 emitter output should reach 5v, but the use of double-sided large-area copper-clad PCBs cannot reach 5v, only about 2v, but it does not affect the sensitivity of electromagnetic field reception. So I think that the output voltage of tr5 has nothing to do with it.

[FrancoItaly]

Your document mentions that the tr5 emitter output should reach 5v, but the use of double-sided large-area copper-clad PCBs cannot reach 5v, only about 2v, but it does not affect the sensitivity of electromagnetic field reception. So I think that the output voltage of tr5 has nothing to do with it.

If the tuning has been done correctly, any value in the 2 - 6V range is fine, this value is not critical.

[liudengyuand]

It is difficult to detect metals. I wonder if anyone in the world has ever succeeded?

[FrancoItaly]

It is difficult to detect metals. I wonder if anyone in the world has ever succeeded?

I privately had several positive feedbacks with some important findings.

https://www.youtube.com/watch?v=yR3tzT2Jd-g

[liudengyuand]

I am very responsible to tell you that after hundreds of experiments by many of us, including single-panel and double-panel, we have replaced various capacitors and transistors, and finally came to the conclusion that it may ring in the wild, but it is not right. Metal responds, it only responds to electromagnetic fields, such as dialing mobile phones, electric sparks, but underground metal cannot have such a strong magnetic field, and underground metal has no electric field. No matter how large the electric field, it will be displayed underground, including powerful lightning. As long as it enters the ground, it will disappear. A small number of people say that metal has been detected. This is an irresponsible statement, even to hype their products. So far, no LRL is really useful, so you Don’t worry about suspecting that you haven’t done it well, because it is useless in the first place, so you can never do it well.

[FrancoItaly]

I am very responsible to tell you that after hundreds of experiments by many of us, including single-panel and double-panel, we have replaced various capacitors and transistors, and finally came to the conclusion that it may ring in the wild, but it is not right. Metal responds, it only responds to electromagnetic fields, such as dialing mobile phones, electric sparks, but underground metal cannot have such a strong magnetic field, and underground metal has no electric field. No matter how large the electric field, it will be displayed underground, including powerful lightning. As long as it enters the ground, it will disappear. A small number of people say that metal has been detected. This is an irresponsible statement, even to hype their products. So far, no LRL is really useful, so you Don?t worry about suspecting that you haven?t done it well, because it is useless in the first place, so you can never do it well.

In the past I have already said several times that I can say that my lrl works where I live, in Italy and in Switzerland where I have lived for some time but I cannot say it for other countries. You can only say with certainty that my lrl does not work in your country, assuming you have done a correct tuning. What evidence do you have that my lrl does not work in other countries? The "phenomenon" is not recognized by official science, also because it has never been studied in depth, is this enough to say that it does not exist? According to official science, the diviner is impossible to find water, but this activity has existed for millennia. Only a few days ago a company came to my land to build a well, a diviner, which works with the company, said "dig here" and at a depth of 60 m there was plenty of water, 60 liters per minute.

[folharin]

In the past I have already said several times that I can say that my lrl works where I live, in Italy and in Switzerland where I have lived for some time but I cannot say it for other countries. You can only say with certainty that my lrl does not work in your country, assuming you have done a correct tuning. What evidence do you have that my lrl does not work in other countries? The "phenomenon" is not recognized by official science, also because it has never been studied in depth, is this enough to say that it does not exist? According to official science, the diviner is impossible to find water, but this activity has existed for millennia. Only a few days ago a company came to my land to build a well, a diviner, which works with the company, said "dig here" and at a depth of 60 m there was plenty of water, 60 liters per minute.why does it not work in other countries? do you think it is the frequency? at what frequency do you believe your device has an advantage and does it work there?

[FrancoItaly]

why does it not work in other countries? do you think it is the frequency? at what frequency do you believe your device has an advantage and does it work there?

The fact that there is a resonant circuit (L1 / C10) implies that in some way the frequency is important and in my opinion there are 2 possibilities, one is that the phenomenon emits in a wide range of frequencies and therefore also in the FM range (about 80 - 110 Mhz), the other possibility is that the phenomenon interferes with the signal emitted by transmitters in this range but in this case the lrl would have to detect this signal source in a directive way, which does not happen.

[liudengyuand]

For so many years, I haven’t seen you make a decent pcb. A decent machine. I haven’t seen you make a video. You don’t even know the value of the inductance. What tuning are you talking about?

[FrancoItaly]

In Italy there is a proverb "appearances are deceiving".

[liudengyuand]

Let me tell you the truth, this circuit is made of double-sided copper clad laminate, and the output is only a little bit. When made of single-sided copper clad laminate, the output is more than two volts. It does not matter how much the output is. As long as it can be compared in the end, there is no adjustment for l1 and c10. Meaning, within the range of 100pf, or even greater, its sensitivity has not changed much. It can react to the sky or some ground, but this is only a problem of geographic magnetic field and has nothing to do with metal. Don’t say you succeeded. In fact, no one has ever seen you, nor can you know that you succeeded or failed. You always like to hear others say that you succeeded, and you hate others to say no. This is your psychological problem. You found water at a depth of 60 meters in your country. The basic knowledge tells you that as long as it is not a mountain, there is basically water in the ground 60 meters deep. You attribute this function to the oc

[FrancoItaly]

All forum members will take note of your opinion, as far as I'm concerned I have nothing more to say to you.

[Rubin]

Hello Franco
You write:
We cannot use an oscilloscope for measurements in the sensor stage and for the adjustment need only one voltmeter is required to connect to the output of the filter R16, C18 without the use of the oscillator.
If we have 2-4volts DC output, this means that the sensor stage is working properly without oscillations.
But .... we can have oscillation, because a voltmeter can not show it and let us have an output in the range 2-4v DC
My question.
Can we use the oscilloscope to properly adjust the trimmer on the TR3 emitter or is it practically setting in the field?
Please explain more
Thank you

[FrancoItaly]

Hello Franco
You write:
We cannot use an oscilloscope for measurements in the sensor stage and for the adjustment need only one voltmeter is required to connect to the output of the filter R16, C18 without the use of the oscillator.
If we have 2-4volts DC output, this means that the sensor stage is working properly without oscillations.
But .... we can have oscillation, because a voltmeter can not show it and let us have an output in the range 2-4v DC
My question.
Can we use the oscilloscope to properly adjust the trimmer on the TR3 emitter or is it practically setting in the field?
Please explain more
Thank you

in the helps I wrote: "For the first test do not connect quartz then look at out point, the DC voltage must be 0V.". The sensor stage output is always a DC voltage, rectified by the two diodes. This voltage is the rectified 8Mhz signal. The use of the oscilloscope is only for verifying the proper functioning of the oscillator. Outdoors there is no need for any adjustment other than the threshold and gain in the stage display.

[Rubin]

Thanks for your quick reply.
After checking I saw that. With the trimmer calibration min-max in the emitter TR3 the output to the filter is not 0V DC (without oscillator), but output is 50mv-150mv. So i think we cannot have 0V DC because the diodes produce this increase signal
Ofcourse (without oscillator, coil and antenna) if we touch the input, the output is >8V DC. This is correct?
I repeat again i use only sensor stage without oscillator coil and antenna

[FrancoItaly]

Thanks for your quick reply.
After checking I saw that. With the trimmer calibration min-max in the emitter TR3 the output to the filter is not 0V DC (without oscillator), but output is 50mv-150mv. So i think we cannot have 0V DC because the diodes produce this increase signal
Ofcourse (without oscillator, coil and antenna) if we touch the input, the output is >8V DC. This is correct?
I repeat again i use only sensor stage without oscillator coil and antenna

No, the out sensor stage must be 0V DC, if this is not the case it means that there is still self oscillation, indeed even with 0V volts there could still be a small signal due to the voltage threshold caused by the diodes. In addition, the antenna (even a piece of wire) must be connected because it contributes to the possible self oscillation.

[Rubin]

Hi Franko

If we have an oscillation in sensor stage output (8MHZ disconnect , coil and antenna are connect) at any value C13,C14 >50pf can we remove one capacitor C13 or C14 or all of them?

[FrancoItaly]

Hi Franko

If we have an oscillation in sensor stage output (8MHZ disconnect , coil and antenna are connect) at any value C13,C14 >50pf can we remove one capacitor C13 or C14 or all of them?

Yes, or you can increase R10 / R12 (1.5K or 2.2K)

[Rubin]

Yes, or you can increase R10 / R12 (1.5K or 2.2K)
I think I don't explain it correctly.
I keep as your last update the same values for R10 = 1K trimmer, R2 = 220R and "play" with capacitors values for 0V DC output.
I saw with capacitors <50pf or without capacitors the output is stability and OV DC
It is enough .. or it is necessary to use capacitors?

[FrancoItaly]

I think I don't explain it correctly.
I keep as your last update the same values for R10 = 1K trimmer, R2 = 220R and "play" with capacitors values for 0V DC output.
I saw with capacitors <50pf or without capacitors the output is stability and OV DC
It is enough .. or it is necessary to use capacitors?

It is enough.

[Rubin]

Thank you very much :):)

[liudengyuand]

Most people have overlooked an important point and are busy with how to make it, but they don’t want to make it useful or not. This is the point. What metal it can explore, how far it can explore, and how deep it can be, all of which require data to speak. ,

[folharin]

where are you, morgan?to answer?

[gwlwudi]

Most people have overlooked an important point and are busy with how to make it, but they don’t want to make it useful or not. This is the point. What metal it can explore, how far it can explore, and how deep it can be, all of which require data to speak. ,
Your ignorance cannot mean non-existence

[brs]

Let me tell you the truth, this circuit is made of double-sided copper clad laminate, and the output is only a little bit. When made of single-sided copper clad laminate, the output is more than two volts. It does not matter how much the output is. As long as it can be compared in the end, there is no adjustment for l1 and c10. Meaning, within the range of 100pf, or even greater, its sensitivity has not changed much. It can react to the sky or some ground, but this is only a problem of geographic magnetic field and has nothing to do with metal. Don?t say you succeeded. In fact, no one has ever seen you, nor can you know that you succeeded or failed. You always like to hear others say that you succeeded, and you hate others to say no. This is your psychological problem. You found water at a depth of 60 meters in your country. The basic knowledge tells you that as long as it is not a mountain, there is basically water in the ground 60 meters deep. You attribute this function to the oc

He gave Franco everything he had. Thanks Franco. As for you, you just have to criticize others.

[zakari]

hi franco

thank you so much for sharing this circuit

i made several time your lrl that is work perfect

best regard

zakari

[zakari]

hi
i used china digital fm transmitter module and injecte weak signal from transmitter to base of tr2 ,i have removed xtal and tr1 i have nulled transmitter and reciever antenna's
that is working good
now i can change the transmitter frequence and tune in my area for best operation
best regard

zakari

[FrancoItaly]

hi
i used china digital fm transmitter module and injecte weak signal from transmitter to base of tr2 ,i have removed xtal and tr1 i have nulled transmitter and reciever antenna's
that is working good
now i can change the transmitter frequence and tune in my area for best operation
best regard

zakari

What you did is very interesting, did you keep L1 / C10? If so, have you tuned the transmitter frequency with L1 / C10? I too am experimenting with an FM oscillator that I made, my problem is that the signal is always too strong and saturates the sensor stage, I have tried unsuccessfully to shield the oscillator and further decouple the oscillator power supply.

[zakari]

What you did is very interesting, did you keep L1 / C10? If so, have you tuned the transmitter frequency with L1 / C10? I too am experimenting with an FM oscillator that I made, my problem is that the signal is always too strong and saturates the sensor stage, I have tried unsuccessfully to shield the oscillator and further decouple the oscillator power supply.
hi franco

you are right i have made some handmade fm transmitter circuit but saturates the sensor intrance signal and unstable the transmitter frequency
i use below pll fm t module adjusted distance transmitter and receiver circuit to avoid the saturation signal
i transfer pp key of module on the box to adjust the frequency of transmitter



best regard
zakari

[FrancoItaly]

hi franco

you are right i have made some handmade fm transmitter circuit but saturates the sensor intrance signal and unstable the transmitter frequency
i use below pll fm t module adjusted distance transmitter and receiver circuit to avoid the saturation signal
i transfer pp key of module on the box to adjust the frequency of transmitter



best regard
zakari

Thank you for the information, I also invite other members to experiment. The fact that two equal frequencies arrive at the mixer (TR2 base) makes it much more sensitive. With the 20Mhz oscillator my idea was just this, that is to tune L1C / 10 on a harmonic of the oscillator. But even in this case the signal is too strong and unstable.

[zakari]

Thank you for the information, I also invite other members to experiment. The fact that two equal frequencies arrive at the mixer (TR2 base) makes it much more sensitive. With the 20Mhz oscillator my idea was just this, that is to tune L1C / 10 on a harmonic of the oscillator. But even in this case the signal is too strong and unstable.
hi
i use one 10pf cap an one 5k pot in input transmitter signal to base of tr2 to adjust mixing rate of two signals an adjust sensor out put voltage
i believe the most important problem of this device is self oscillation . in my country the circuit self oscillation is variable during the day and night
for example if one body adjust the out put voltage zero at 21 oclock the device work good that this time and no working perfect at another time
there fore i put the one 5k double volume instead of r10 an r12 to adjust the self oscillation. last year i have explained in this forum
dose any body has the information about the gold filter in below schematic??



best regard
zakari

[FrancoItaly]

hi
i use one 10pf cap an one 5k pot in input transmitter signal to base of tr2 to adjust mixing rate of to signals an adjust sensor out put voltage


best regard
zakari

Fine thanks.

[brain]

hi everyone i found this while browsing a forum site i tried it but i don't have a test area .. its sensitivity is nice.

https://ibb.co/GHWYtcF

[Pahom]

hi everyone i found this while browsing a forum site i tried it but i don't have a test area .. its sensitivity is nice.

https://ibb.co/GHWYtcFWhat types of radiation is this circuit sensitive to? And that at the input there is a quartz resonator, or an oscillator with a frequency of 8 MHz

[liudengyuand]

good good

[liudengyuand]

I successfully detected a copper coin with a diameter of 2 cm, buried for 6 years, at a distance of 4 meters, and a depth of 30 cm, but the output of lm358 is unstable. As time increases, the machine always automatically alarms to prove the sensor The output voltage is rising automatically, so I have to adjust the critical point of 358 frequently.

[tasmen]

I successfully detected a copper coin with a diameter of 2 cm, buried for 6 years, at a distance of 4 meters, and a depth of 30 cm, but the output of lm358 is unstable. As time increases, the machine always automatically alarms to prove the sensor The output voltage is rising automatically, so I have to adjust the critical point of 358 frequently.

https://www.longrangelocators.com/forums/showpost.php?p=160691&postcount=2558

[brain]

I successfully detected a copper coin with a diameter of 2 cm, buried for 6 years, at a distance of 4 meters, and a depth of 30 cm, but the output of lm358 is unstable. As time increases, the machine always automatically alarms to prove the sensor The output voltage is rising automatically, so I have to adjust the critical point of 358 frequently.

Did you find it with the circuit diagram I sent?

[ERDOGAN37]

hello,
can you give information about the coil value? :)
best regards...

[FrancoItaly]

This is not my lrl, you better open a new thread so as not to get confused.

[ERDOGAN37]

Can you share a gold lrl project that you are 100% sure of.:):)

[FrancoItaly]

Can you share a gold lrl project that you are 100% sure of.:):)

I don't know of lrls that only work for gold.

[FrancoItaly]

I am working on the 100 Mhz version and I do not use a module but a transistor oscillator with frequency command with varicap diode, I do not use a coil printed on the pcb, but a flat coil placed horizontally, while on the sensor stage an equal coil but placed vertically , with the aim of minimizing the transmission of the signal from the oscillator to the sensor stage. In this way, a good result is obtained by keeping the oscillator about 7 cm from the sensor stage. As soon as I have finished drawing the scheme I will post it.

[liudengyuand]

At least you need to know the inductance value of L1 to roughly determine the resonance frequency with c10. This requires a high-precision inductance meter.

[FrancoItaly]

At least you need to know the inductance value of L1 to roughly determine the resonance frequency with c10. This requires a high-precision inductance meter.

There is a simpler system, just build the two coils, oscillator and sensor stage, the same and check the output of the sensor stage (DC voltage). When the maximum value is obtained, it means that L1 / C10 is in resonance with the oscillator.

[liudengyuand]

This is a good way

[liudengyuand]

I think your oscillator should be shielded by a tin box separately

[FrancoItaly]

I think your oscillator should be shielded by a tin box separately

Of course, but we must not forget that even the power must be decoupled.

[liudengyuand]

The biggest problem is that the specific frequency responds to the metal, or a certain frequency, or any frequency,

[FrancoItaly]

The biggest problem is that the specific frequency responds to the metal, or a certain frequency, or any frequency,

In my opinion there is no specific frequency for metals, the phenomenon exists in a wide range from Khz to infrared. All that remains is to experiment and it is very important to have a field where to do the tests, it is necessary to bury the metals, for example gold / silver and wait at least a few months or less, it depends on the type of soil.

[liudengyuand]

If it has nothing to do with frequency, there is no need to adjust L1 and C10, their resonance frequency is much higher than 8MHZ

[folharin]

In my opinion there is no specific frequency for metals, the phenomenon exists in a wide range from Khz to infrared. All that remains is to experiment and it is very important to have a field where to do the tests, it is necessary to bury the metals, for example gold / silver and wait at least a few months or less, it depends on the type of soil.

exactly sir franco italia !!

[liudengyuand]

I have successfully increased the distance to about 50 meters

[liudengyuand]

Has anyone experimented with using an aluminum box to install the entire circuit? Will it have any effect?

[liudengyuand]

I placed an fm transmitter on the opposite side of the copperware buried for five years, which emits a certain pulse signal. When the transmitter, the metal and the detector are in a straight line, the signal is particularly strong, and the distance has exceeded at least 300m.

[tasmen]

When it is not straight line with metal, do you catch the fm transmitter?

[liudengyuand]

no

[brain]

no
Can you publish the fm transmitter scheme you made.

[liudengyuand]

ok

[ERDOGAN37]

https://www.youtube.com/watch?v=SrmxnvivM-0

https://youtu.be/MbOk9o6Fc3M

https://www.youtube.com/3304e2ba-a15e-42a2-8a13-fbc22861d48f

[humhum]

https://www.youtube.com/watch?v=SrmxnvivM-0

https://youtu.be/MbOk9o6Fc3M

https://www.youtube.com/3304e2ba-a15e-42a2-8a13-fbc22861d48f


Kayseri , Second video is good , third video link not woks .

[ERDOGAN37]

https://youtu.be/1jSvzxRhjPk

[humhum]

https://youtu.be/1jSvzxRhjPk

Which version of Franco LRL build You and test in upper Video.

[tasmen]

Hello mr Franco.
I hope you are well.
I have some questions.
First i create sensor stage quartz 8Mhz and is ok (out 5.85V and when I touch the antenna the voltage drops 5.7v dc).
When I connect the antenna amplifier stage (without the display stage) what value should I have at the exit?
I set it with the potetiometer to 5.7v but when I touch the antenna the voltage does not drop. it's correct? (without display stage).
Thank you in advance.

[FrancoItaly]

Hello mr Franco.
I hope you are well.
I have some questions.
First i create sensor stage quartz 8Mhz and is ok (out 5.85V and when I touch the antenna the voltage drops 5.7v dc).
When I connect the antenna amplifier stage (without the display stage) what value should I have at the exit?
I set it with the potetiometer to 5.7v but when I touch the antenna the voltage does not drop. it's correct? (without display stage).
Thank you in advance.

Yes, that is correct, however it is better to try the operation without the antenna amplifier on the test field, also to establish the actual improvement.

[omar]

Hello Franco. The phenomenon is an invisible light beam of negative electrons similar to a cathode ray. It is the resonance of the material. What you lack is a transmitter circuit to raise the kinetic energy of the photoelectrons, so that they can be easily captured. Your device captures them as stray signals from close distances.

[FrancoItaly]

Hello Franco. The phenomenon is an invisible light beam of negative electrons similar to a cathode ray. It is the resonance of the material. What you lack is a transmitter circuit to raise the kinetic energy of the photoelectrons, so that they can be easily captured. Your device captures them as stray signals from close distances.

I doubt anyone knows exactly how the phenomenon works, we just know that it works over a wide range of frequencies. All the rest are theories to be proved without considering that whatever is transmitted must reach tens of meters away and be directive. I am convinced that all lrls are passive receivers and even if there is a transmitting led, it cannot get very far.

[Babak51]

Hello. I had good discoveries. Thank you, Mr. Franco, Italy. Although the radius of my discoveries was not more than 4 meters, but I love the circuit of this device. Thank you.

[Babak51]

Has anyone experimented with using an aluminum box to install the entire circuit? Will it have any effect?

Not because it is said to interfere with signal reception.

[FrancoItaly]

Hello. I had good discoveries. Thank you, Mr. Franco, Italy. Although the radius of my discoveries was not more than 4 meters, but I love the circuit of this device. Thank you.

I am happy that you have had good results with my lrl and I thank you for having said it publicly for the benefit of those who do not believe in the phenomenon or at least are in doubt. Other forum members confirmed it privately but asked me not to disclose it.

[Pahom]

Hello. I had good discoveries. Thank you, Mr. Franco, Italy. Although the radius of my discoveries was not more than 4 meters, but I love the circuit of this device. Thank you.Which version of the schema did you achieve good results with?

[Babak51]

This design and circuit of Mr. Franco, which has been slightly strengthened by our good friends, and of course it is much better to increase the distance of the sensor from the discipline. However, it is very powerful and sensitive.

[Babak51]

I am happy that you have had good results with my lrl and I thank you for having said it publicly for the benefit of those who do not believe in the phenomenon or at least are in doubt. Other forum members confirmed it privately but asked me not to disclose it.

Dear Mr. Franco. The art is to be a man of action, not just talking ... I buried a few pieces of metal in the ground in a private property several years ago, and I practice there at least once a week, training myself and my systems. I challenge. Dear Mr. Franco, I have recently emailed you a sample of my discoveries in private so that you can be briefly appreciated.I apologize for the translations and spelling mistakes
Your friend Babak

[Babak51]

I am happy that you have had good results with my lrl and I thank you for having said it publicly for the benefit of those who do not believe in the phenomenon or at least are in doubt. Other forum members confirmed it privately but asked me not to disclose it.

Thank you dear Francois. We strive to spend from time to time in cash to enjoy exploring and exploring. And we owe the good results to you and your tracker design (lrl franco)

[Babak51]

Here are some tips to help you get started:

1-Your device is not properly configured.
2-These systems are out of balance with even a very small amount of displacement and an increase or decrease in height.
3-This tracking system is not for distance and radius and you must pass over a buried or buried metal to make a complete and accurate sense.
4-The effect of this phenomenon is not the same and powerful everywhere.
5-In order for the operator to move when exploring, it must first be from north to south and then from south to north (valuable for sensing non ferrous metals).
6-Enough practice. Test and test locations. And you do not have old metal buried.

Thanks to my teacher Mr. Franco from Italy

[FrancoItaly]

Here are some tips to help you get started:

1-Your device is not properly configured.
2-These systems are out of balance with even a very small amount of displacement and an increase or decrease in height.
3-This tracking system is not for distance and radius and you must pass over a buried or buried metal to make a complete and accurate sense.
4-The effect of this phenomenon is not the same and powerful everywhere.
5-In order for the operator to move when exploring, it must first be from north to south and then from south to north (valuable for sensing non ferrous metals).
6-Enough practice. Test and test locations. And you do not have old metal buried.

Thanks to my teacher Mr. Franco from Italy

Thank you for your contribution which will certainly be useful to the new members of the forum, who perhaps are in doubt about the actual functioning of the lrls.

[Babak51]

https://youtu.be/oABgObXsA8M
You have to try to reach the goal...
Bury scrap metal in a place for practice and testing ...
It is not enough to talk, try ...
I buried different metals in several places and even in the mountains 6 years ago ...
With the guidance of my friends, I built the Franco machine and tried to understand it...
And I must admit that I owe all my good results to my good friends, especially Mr. Franco from Italy....

[Babak51]

https://youtu.be/UXcZoiyqouw

Lrl Franco works well

[kaveh]

Hello to all Many thanks to Mr. Franco and my dear friend Babak This circuit works well I have seen its success The Franco circuit is a powerful and excellent static finder, which makes it powerful and good for precious metals Thank you very much Mehdi Moein

[FrancoItaly]

Hello to all Many thanks to Mr. Franco and my dear friend Babak This circuit works well I have seen its success The Franco circuit is a powerful and excellent static finder, which makes it powerful and good for precious metals Thank you very much Mehdi Moein

I always like the confirmations of the good functioning of my lrl, this is also useful for those who approach our forum and maybe they are a little incredulous about the effectiveness on a type of tool that, according to official science, cannot work.

[FrancoItaly]

This new version should be more sensitive than the original one, although it is simpler, unfortunately I have no possibility at the time of doing field tests. Briefly, it's about bringing the sensor stage into self oscillating (in my case about 15 Mhz) and regulating L1 / C1 on a harmonic. This will increase the sensitivity. The setup is different from the other version, in fact here we want the self oscillating of the stage and not avoid it.
Let's see what are the differences from the original version:
- there is no quartz oscillator.
- there are no resistors and capacitors
of emitter, to have the maximum
gain.
- In parallel to L1 there is a capacitor
variable instead of a fixed one.
Self oscillation depends on the following factors:
- the gain of the transistors,
those of type BC ... C are required.
- the value of C3 and C4.
- the drawing of the pcb.
Since this lrl derives from the previous one and is simpler, you can use the same pcb, even the setup is simpler:
Adjust C1 until a voltage in the range 2 - 5 V is obtained at the output of the sensor stage. If the output is> 5V then decrease C3 or C4. If the output is zero, then increase C3 or C4.
Also with this lrl touch the antenna with your hand and check that the signal decreases.

[FrancoItaly]

I must warn you that this version does not detect the phenomenon or at least in a point of my land where my other lrls give a signal. Maybe L / C1 is tuned to too low a frequency, I'll make some tweaks and then let you know.

[brain]

I must warn you that this version does not detect the phenomenon or at least in a point of my land where my other lrls give a signal. Maybe L / C1 is tuned to too low a frequency, I'll make some tweaks and then let you know.

Did you use s9014 transistor? DC current gain hfe value min 60 max 1000

[FrancoItaly]

Did you use s9014 transistor? DC current gain hfe value min 60 max 1000

I use BC183C, gain in the range 500 - 800, but the probleme is not the transistors.
Probably the frequency of L1 / C1 = about 40 pF is too low to detect the phenomenon, at least in my area. I want to try to trigger the oscillation by connecting the collector of TR3 directly with L1 / C1 through a capacitor (few pF) and instead of C1 a capacitor of 22 pF.

[brain]

huge difference .signal gets too sensitive .

[AurumKid]

This design and circuit of Mr. Franco, which has been slightly strengthened by our good friends, and of course it is much better to increase the distance of the sensor from the discipline. However, it is very powerful and sensitive.

hello sir can you share your complete files for this project. i want to try this.

[FrancoItaly]

hello sir can you share your complete files for this project. i want to try this.

I advise you to make the original project first, which is certainly working, while the later versions as far as I'm concerned are not stable or do not work in the field, but currently I do not have a test field but only an area where the original lrl provides a good signal.

[FrancoItaly]

I place the new display stage that allows a better adjustment of the threshold and the power stage, alternatively you can use any stabilized power supply.

[AurumKid]

thank you sir for your kind support i will start collecting all parts needed to build the 8Mhz circuit. :)

[AurumKid]

is it ok to add digital VU meter to the circuit or is there any available circiut with VU meter in this thread forum?

[FrancoItaly]

is it ok to add digital VU meter to the circuit or is there any available circiut with VU meter in this thread forum?

It is possible to use digital VU meters, however it is more complicated to put a buzzer and adjust the threshold, in my opinion 3 LEDs are more practical. However, other LEDs can be added.

[liudengyuand]

Must use metal casing

[liudengyuand]

So far, I have made a silver coin with a diameter of 4cm can reach a detection distance of up to 100, but its depth is only tens of centimeters, which is far lower than my depth requirement. I don?t know how your detection depth is, whether there is Tested?

[FrancoItaly]

So far, I have made a silver coin with a diameter of 4cm can reach a detection distance of up to 100, but its depth is only tens of centimeters, which is far lower than my depth requirement. I don?t know how your detection depth is, whether there is Tested?



Do you mean 100m?

[liudengyuand]

yes

[FrancoItaly]

yes

In my opinion it is impossible with any lrl to find a coin at 100m and perhaps recently buried.

[liudengyuand]

It has been buried for nearly ten years. When the L-stick was popular all over the world in those years, I buried it for experimentation, but the L-stick failed and I didn’t feel its effect.

[FrancoItaly]

It has been buried for nearly ten years. When the L-stick was popular all over the world in those years, I buried it for experimentation, but the L-stick failed and I didn?t feel its effect.

When I had the test field silver objects were buried at about 20 cm and were marked starting from about 4 m if I remember correctly. I think the depth depends on the type of soil, the mass of the metal and how long the metal is buried.

[liudengyuand]

If the depth is only 20cm, it is almost any real effect,

[FrancoItaly]

If the depth is only 20cm, it is almost any real effect,

I did not say that 20 cm is the maximum depth, I have not tried to bury deeper.

[humhum]

For deep of this Rec system , I think that is up to 5 meter (for big metal) or more ... :)

[Babak51]

https://youtu.be/6hKuX4O2MwM
Mr. Franco ... among all the equipment I have, your LRL looks like a shining diamond. Thank you.

[liudengyuand]

The higher the frequency, the farther the detection distance

[Babak51]

Yes, the type of soil and the height of the area must also be considered

[Babak51]

The higher the frequency, the farther the detection distance


Yes, higher frequency and voltage identify better targets and harmonics

[brain]

This design and circuit of Mr. Franco, which has been slightly strengthened by our good friends, and of course it is much better to increase the distance of the sensor from the discipline. However, it is very powerful and sensitive.

is it possible for you to send pcb ?

[brain]

is it possible to send pcb drawing

[liudengyuand]

I suggest adding a passive filter after the antenna inductance

[Pahom]

I suggest adding a passive filter after the antenna inductanceGood day ! What cutoff frequency should the filter have?

[liudengyuand]

100M

[Pahom]

100M
Thank you!

[liudengyuand]

Are you still doing

[Pahom]

Are you still doingYes, I'm doing everything. Until it is possible to locate the target. Perhaps you really need to hit at 100 MHz or close to that.

[liudengyuand]

yes

[abdou2014]

I located a great treasure with Franco lrl 3 days ago, I haven't digged yet , there is a royal tomb in this direction ,
Thank you Franco :)

[FrancoItaly]

I located a great treasure with Franco lrl 3 days ago, I haven't digged yet , there is a royal tomb in this direction ,
Thank you Franco :)

I hope you are successful.

[abdou2014]

Thank you !

[brain]

hello franco, what kind of system is this? Made with lrl fm transmitter.

https://www.instagram.com/karana_digital/

[FrancoItaly]

hello franco, what kind of system is this? Made with lrl fm transmitter.

https://www.instagram.com/karana_digital/

yes, it could be mine, but i can't log into instagram.

[brain]

https://www.youtube.com/watch?v=OplRVuU5bds

[brain]

yes, it could be mine, but i can't log into instagram.

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

https://www.youtube.com/watch?v=OplRVuU5bds

https://www.youtube.com/watch?v=cMBvxexIF4s

[FrancoItaly]

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

https://www.youtube.com/watch?v=OplRVuU5bds

https://www.youtube.com/watch?v=cMBvxexIF4s

Yes, it looks like mine, at least externally.

[brain]

Yes, it looks like mine, at least externally.

franco can you take a look at this.this is used

https://www.minicircuits.com/pdfs/ERA-3SM+.pdf

[FrancoItaly]

franco can you take a look at this.this is used

https://www.minicircuits.com/pdfs/ERA-3SM+.pdf

It's interesting, but I'm not sure it can be used for the sensor stage, as the mixer and the total gain are important. However you can do tests.

[brain]

It's interesting, but I'm not sure it can be used for the sensor stage, as the mixer and the total gain are important. However you can do tests.


fm transmitter + era-3sm+opamp lm 358 these are the ones I see. as picture.

[liudengyuand]

What is your maximum depth

[brain]

This design and circuit of Mr. Franco, which has been slightly strengthened by our good friends, and of course it is much better to increase the distance of the sensor from the discipline. However, it is very powerful and sensitive.

Is it possible to send PCB of this?

[brain]

hello, have you tried the franco telescopic antenna with a copper or other metal antenna?

[brain]

Franco TR1 Emitter The 8 MHz oscilloscope screen is to be what value.

[FrancoItaly]

Franco TR1 Emitter The 8 MHz oscilloscope screen is to be what value.

The value is not critical, it is in the 1/3 V peak to peak range. Varying C2 / C3 / C4 you get the right voltage value at the sensor stage output. You could also put a semi-fixed potentiometer in place of R3 for easier adjustment.

[brain]

Tr1 Emitter Image Pictured.
https://imgyukle.com/i/0bS4U


I added a 30/40pf capacitor to the Tr4 collector. This is how I solved it.

[FrancoItaly]

I do not understand what happened, I put the post back

The value is not critical, it is in the 1/3 V peak to peak range. Varying C2 / C3 / C4 you get the right voltage value at the sensor stage output. You could also put a semi-fixed potentiometer in place of R3 for easier adjustment.

[brain]

I do not understand what happened, I put the post back

The value is not critical, it is in the 1/3 V peak to peak range. Varying C2 / C3 / C4 you get the right voltage value at the sensor stage output. You could also put a semi-fixed potentiometer in place of R3 for easier adjustment.


do you look at the picture


https://imgyukle.com/i/0441q

[FrancoItaly]

do you look at the picture


https://imgyukle.com/i/0441q


I don't understand what the 30 / 40pf capacitor to the Tr4 collector is for.

[brain]

Tr4 toplayıcıya 30 / 40pf kondansat?r?n ne işe yaradığını anlamıyorum.


Add See. Notice that the droops are from here.

[Locator]

Hello Franco,


i read your theme and i notice that you have alot of patience in your answers,bravo!
As about "phenomenon"(Greek word)i think that gold,silver and copper(but mainly gold and silver)when they are placed(burried)for years in the ground(due to their electrochemical reaction with the soil)become something like antennas with the result that when a radio signal hits them it increases(the signal)and we can catch this increase with any LRL...your's or Mineoro e.t.c.


My regards:


Christos

[FrancoItaly]

Hello Franco,


i read your theme and i notice that you have alot of patience in your answers,bravo!
As about "phenomenon"(Greek word)i think that gold,silver and copper(but mainly gold and silver)when they are placed(burried)for years in the ground(due to their electrochemical reaction with the soil)become something like antennas with the result that when a radio signal hits them it increases(the signal)and we can catch this increase with any LRL...your's or Mineoro e.t.c.


My regards:


Christos


I think your theory is correct but incomplete, as the magnetic field also comes into play in the phenomenon due to the different orientation sensitivity.

[brain]

Is the phenomenon always positive? Or is it negative?


I have detected 2 locations with your sensor. Both are positive, but the iron phenomenon is also effective. Do you have any ideas for this?

[FrancoItaly]

Is the phenomenon always positive? Or is it negative?


I have detected 2 locations with your sensor. Both are positive, but the iron phenomenon is also effective. Do you have any ideas for this?

In my experience the phenomenon is always positive and my various lrls are insensitive to iron, a fact confirmed by other members of the forum, however other members (Geo for example) affirm that instead the lrl is also sensitive to iron. Probably some types of ground can be the cause of this.

[brain]

In my experience the phenomenon is always positive and my various lrls are insensitive to iron, a fact confirmed by other members of the forum, however other members (Geo for example) affirm that instead the lrl is also sensitive to iron. Probably some types of ground can be the cause of this.


What do I need to do to prevent the iron, can you share some information about it?

[Locator]

I think your theory is correct but incomplete, as the magnetic field also comes into play in the phenomenon due to the different orientation sensitivity.


Yes,because earth's magnetic lines moves from south to north.

[shahrayar]

If the device is strongly sensitive to iron and the Earth's magnetic field, it is not suitable for detecting gold
More modification is required

[FrancoItaly]

If the device is strongly sensitive to iron and the Earth's magnetic field, it is not suitable for detecting gold
More modification is required

All the lrls are directional, the maximum sensitivity is from north to south, as I said as far as I am concerned, my lrl, tested in Switzerland and in Italy, is insensitive to iron. However in any case it is necessary to use an MD for the final phase, that is, to establish the exact point.

[brain]

All the lrls are directional, the maximum sensitivity is from north to south, as I said as far as I am concerned, my lrl, tested in Switzerland and in Italy, is insensitive to iron. However in any case it is necessary to use an MD for the final phase, that is, to establish the exact point.

How did you block iron?

[FrancoItaly]

How did you block iron?

In my experience my lrl (but I think the others too) is insensitive to iron, without having to make any changes. If it happens in some type of ground, I don't know what modification to make. I want to add that in the places where I did tests there was a lot of iron, even partially buried stakes and there was no reaction to the iron.

[Locator]

How did you block iron?

This is due to nature,iron rust and does not make a field around it,while gold and silver
do not rust and make a field around them.


So,if there isn't a radio station tuned to the LRL then LRL does not work.
For this reason Mineoro LRL sometimes work and sometimes not,
depending on the country they are in and if there is a tuned station there!!!:)

[FrancoItaly]

This is due to nature,iron rust and does not make a field around it,while gold and silver
do not rust and make a field around them.


So,if there isn't a radio station tuned to the LRL then LRL does not work.
For this reason Mineoro LRL sometimes work and sometimes not,
depending on the country they are in and if there is a tuned station there!!!:)


The phenomenon is very complex and extends over the entire frequency range ranging from 60Khz to 100Mhz to IR and UV. If it were true that a transmitter is needed then you should have a strong signal in the direction of the transmitter, which does not happen and would make the lrl unusable.

[Locator]

The phenomenon is very complex and extends over the entire frequency range ranging from 60Khz to 100Mhz to IR and UV. If it were true that a transmitter is needed then you should have a strong signal in the direction of the transmitter, which does not happen and would make the lrl unusable.


No,the signal of transmitter should not be strong in the area where the LRL works,
and it should be homogeneous(the radio signal)!!!!!!!:)

[FrancoItaly]

No,the signal of transmitter should not be strong in the area where the LRL works,
and it should be homogeneous(the radio signal)!!!!!!!:)

Well, that's a good explanation, but as I said, the phenomenon is very complex.

[brain]

When you connect a 20/40 pf capacitor to the Franco Tr4 collector, you can adjust output.it has been tested working this way.

[FrancoItaly]

When you connect a 20/40 pf capacitor to the Franco Tr4 collector, you can adjust output.it has been tested working this way.


Are you referring to the original 8 Mhz version? Does it work better or does it just work this way?

[brain]

yes 8mhz.

[brain]

Did you use my filter for the iron?

[FrancoItaly]

Did you use my filter for the iron?

As I said where I tried my lrl there was no signal for the iron. Does your modification (the variable capacitor) serve to eliminate the iron?

[brain]

Did you use any other antenna, copper etc. as metal type?

[FrancoItaly]

Did you use any other antenna, copper etc. as metal type?

I use stylus antenna and some time ago the coil antenna but without finding differences, you could try to change the number of turns.

[brain]

I use stylus antenna and some time ago the coil antenna but without finding differences, you could try to change the number of turns.


I know this, my purpose I think that the metal used in the antenna has an effect on the phenomenon.

[brain]

I use stylus antenna and some time ago the coil antenna but without finding differences, you could try to change the number of turns.


I know this, my purpose I think that the metal used in the antenna has an effect on the phenomenon.
I made a copper antenna, I will try it at the test site on Sunday

[liudengyuand]

good

[mustefa ubram]

hi franco

I'm back after a long time;):)
I have a question
Why didn't you use high gain ICs in the design for the amplifier part ca3130 or ca3140 or....?

Do you think it is possible to replace the IC with a transistor?

[FrancoItaly]

hi franco

I'm back after a long time;):)
I have a question
Why didn't you use high gain ICs in the design for the amplifier part ca3130 or ca3140 or....?

Do you think it is possible to replace the IC with a transistor?

It is not possible to replace a transistor with a normal IC which are basically only for audio frequency due to the too low gain over the Mhz. The CA3130 reaches 15 Mhz but with a gain of one, if you make a 100 Khz RC oscillator with a LM358 you will see that you do not get a square wave (which contains many harmonics over 100 Mhz). Better is the TL081 which at 100 Khz gives an acceptable waveform.

[mustefa ubram]

It is not possible to replace a transistor with a normal IC which are basically only for audio frequency due to the too low gain over the Mhz. The CA3130 reaches 15 Mhz but with a gain of one, if you make a 100 Khz RC oscillator with a LM358 you will see that you do not get a square wave (which contains many harmonics over 100 Mhz). Better is the TL081 which at 100 Khz gives an acceptable waveform.
I gave an example ca3130 or ...

So the problem here is bandwidth?If there is, can IC be replaced with 100 MHz bandwidth?

I mean only for the amplifier and mixer parts Not the oscillator part

[mustefa ubram]

Please give a general description of how the device works from zero to 100?

And important factors in metal detection

[FrancoItaly]

Please give a general description of how the device works from zero to 100?

And important factors in metal detection

The sensor stage amplifies a signal of 8 Mhz and this with a gain of about 500 X 500 X 500 times, in fact each BC ... C transistor has a beta of 500, this in theory and without counting the losses, but the fact remains that a 100Mhz bandwidth IC amplifies 100Mhz / 8Mhz = about 12 times.

[liudengyuand]

The largest depth of 2m

[brain]

In the northern latitudes of the U.S. the total magnetic field strength is in the order of 50,000 to 55,000 nanoTesla and varies from location to location. Short period variations due to magnetic storms may reach several hundred nanoTesla. Diurnal variations caused by solar induced ionospheric currents are in the order of tens of nanoTesla. Presently, the long term trend of the total field is in the order of minus 90 nanoTesla per year ( steadily decreasing).
The proton precession frequency detected by a suitable sensor in the geomagnetic field of the earth will be at a frequency in the audio range:
Example: 42.58 mHz / Tesla x 52500 x 1E-9 Tesla= 2235 Hz
In my northeast location the frequency readings average about 2275 Hz, corresponding to a total field of about 53,400 nanoTesla. This seems to correlate with published models. This figure also agrees with the value obtained using the fluxgate magnetometer that was calibrated using a Helmholtz coil. The fluxgate sensor was tipped upward from a horizontal position to nearly vertical to obtain the maximum reading of the earth field.

[mustefa ubram]

hi franco

How does this circuit react to the cavity? Does the cavity reduce the output voltage?

[FrancoItaly]

hi franco

How does this circuit react to the cavity? Does the cavity reduce the output voltage?

I don't know, I have not experiences.

[mustefa ubram]

your pcb

[FrancoItaly]

I gave an example ca3130 or ...

So the problem here is bandwidth?If there is, can IC be replaced with 100 MHz bandwidth?

I mean only for the amplifier and mixer parts Not the oscillator part

The problem is the gain, in my opinion another solution is not possible, furthermore I do not understand why to change a functioning and economic solution with something that is certainly more expensive, assuming that it exists with the necessary characteristics.

[liudengyuand]

In this circuit, if the crystal frequency uses 100MHz, which requires changes, because the 100MHz frequency is very high, I think we should pay attention to the filtering of the capacitor

[mc_307]

hello guys, i have a problem. led1 is not working at all. led2 and led3 are working, buzzer is working. I replaced lm358 and led, but still not working..

[FrancoItaly]

hello guys, i have a problem. led1 is not working at all. led2 and led3 are working, buzzer is working. I replaced lm358 and led, but still not working..




If the buzzer works, the led that is connected to the same point must also work, check the value of R9, perhaps it is wrong.

[mc_307]

If the buzzer works, the led that is connected to the same point must also work, check the value of R9, perhaps it is wrong.


I connected 22k resistors in series to p1, but I don't have 560k and 56k resistors. 220k and 150k connected. Could the problem be caused by this? also led1 connected to ic2b r7. When p1 and p2 are fully open, all the leds are on and the buzzer beeps. I made the single coil crystal one. I guess I need to find 560k and 56k resistors. Are these values so important? Are there close values?

[Sally]

Hi Franco, I'm a newbie here. I will try to build your 8mhz crystal detector and thank you for sharing your design here in this forum. I do not know if it works here in my country somewhere in South East Asia. Hopefully it will and serve the purpose. Will update you soon. Thank you.

[liudengyuand]

Should be joined .Acc circuit

[liudengyuand]

AGC

[kaveh]

Hello to all friends , I want to use the mpsa18 transistor in this circuit. Is there no problem? Thank you

[FrancoItaly]

Hello to all friends , I want to use the mpsa18 transistor in this circuit. Is there no problem? Thank you

I think if you use it with a gain greater than 500 it is fine.

[liudengyuand]

I think we should change the power supply, using a single lithium battery voltage, 3V to supply the whole system without the need for too much bulky battery

[ERDOGAN37]

https://www.youtube.com/watch?v=C1LQ1oayuzwl

[humhum]

https://www.youtube.com/watch?v=C1LQ1oayuzwl

Coungratulation Friend .

[ERDOGAN37]

:)

[FrancoItaly]

I placed again a 20Mhz version which proved unstable, but simply by changing the quartz from 20Mhz to 14Mhz it became stable, I have verified this with two lrls. This is basically the original 8Mhz version in which I changed the value of the quartz and added several trimmers to facilitate the tuning. By adjusting C10 it is possible to find a point where the signal increases considerably, a sign that it is tuned on a harmonic and this increases the sensitivity of the lrl. You can also try other frequencies, for example 15 Mhz, 16 Mhz, 17Mhz or others. I haven't been able to test on the field yet.

[brain]

As soon as the phenomenon catches the sinus amplitude value, there is growth. I saw this in the trials at 110 mhz. I will send you by franco size at 110 mhz. I used your circuit.

[brain]

by franco can you tell us what is in your test area as metal and what is the depth?

[FrancoItaly]

by franco can you tell us what is in your test area as metal and what is the depth?

Unfortunately I no longer have a field where to do the tests, there is only a point on my ground where there is a good signal, I don't know what is buried there. I use this place where I do comparative tests.

[liudengyuand]

I suggest that you change the 3.3 volt air supply voltage, you can use a lithium battery to do power

[Sally]

Hello Sir Franco, I had sent an email to you regarding phenomenon. If you have time please i need your reply.

Thank you,
Sally

[Jeg]

Hi Franco
I would like to ask you what is the frequency range approximately in the tank circuit of L1 and C10.


ps. By the way, L1 is a 3T air core coil. What is the diameter of the core?



Best regards

[FrancoItaly]

Hi Franco
I would like to ask you what is the frequency range approximately in the tank circuit of L1 and C10.


ps. By the way, L1 is a 3T air core coil. What is the diameter of the core?



Best regards


I think the frequency is around 100Mhz and the coil diameter is 10mm.

[Jeg]

I think the frequency is around 100Mhz and the coil diameter is 10mm.




Thanks a lot Franco. :)

[kaveh]

Hello Mr. Franco and dear friends Why does the circuit of some friends sense iron? What is the reason? Wishing the best for you and everyone

[FrancoItaly]

Hello Mr. Franco and dear friends Why does the circuit of some friends sense iron? What is the reason? Wishing the best for you and everyone

According to my experience my lrl is not sensitive to iron, but I also believe the other lrls, I believe that iron is not able to generate or in some way affect the phenomenon, but it is just my personal idea.

[Jeg]

This design and circuit of Mr. Franco, which has been slightly strengthened by our good friends, and of course it is much better to increase the distance of the sensor from the discipline. However, it is very powerful and sensitive.

Hi babak
Is that possible to share the circuit that corresponds to that board of yours? I dont see any Ic's in original franco's circuit. Thanks

[Jeg]

Hi Franco
Do you remember what is the pk-pk voltage value of the composite signal that reaches the base of Tr2? I mean about the product of mixing especially when we hit the right harmonic across the LC tank. Approximately.

Thanks in advance
Merry Christmass and happy new year to all.:)

[FrancoItaly]

Hi Franco
Do you remember what is the pk-pk voltage value of the composite signal that reaches the base of Tr2? I mean about the product of mixing especially when we hit the right harmonic across the LC tank. Approximately.

Thanks in advance
Merry Christmass and happy new year to all.:)

The value is very small, I don't think it's possible to measure it. The only reliable measurement is the sensor stage DC output and all changes in component values are made solely by observing the changes in the output voltage.

[Jeg]

Thank you Franco. I ll give it a try! :-)

[Jeg]

Hi all
Hi Franco

The input P1 trimmer seems that doesn't serve the purpose of its use. I tested two crystals 4M and 16M. The signal at the input of tr2 can not be less than about 50 mV. Imho, your initial design with many 1pf caps in series is a better approach for to increase impedance.

A second issue is the input tank coil. More turns than 3 will give higher sensitivity and higher Q. I made a coil of 8T on a 6mm former to test.

I'd like to ask if you have tested 90 degrees different orientation of the input tank coil than what you currently use. In other words, the coil on your board looks at the sides. Have you tested the operation when it looks forward?

Regards

[FrancoItaly]

Hi all
Hi Franco

The input P1 trimmer seems that doesn't serve the purpose of its use. I tested two crystals 4M and 16M. The signal at the input of tr2 can not be less than about 50 mV. Imho, your initial design with many 1pf caps in series is a better approach for to increase impedance.

A second issue is the input tank coil. More turns than 3 will give higher sensitivity and higher Q. I made a coil of 8T on a 6mm former to test.

I'd like to ask if you have tested 90 degrees different orientation of the input tank coil than what you currently use. In other words, the coil on your board looks at the sides. Have you tested the operation when it looks forward?

Regards

The signal at input TR2 is much smaller than 50mV, consider that the sensor stage is composed of transistors with a gain (direct current) of over 500 each, so the maximum gain is 500X500X500 and the stage would be in saturation without amplifying. I added the trimmer to better adjust the signal to base on TR2 and I found no difference between the two modes. I tried to increase and decrease the number of turns, the lrl only worked with 2 or 3 turns. You have to consider that it is a resonant circuit and increasing the turns decreases the frequency. In the 20 Mhz or 14 Mhz version the L / C is varied to tune on a harmonic of the oscillator and increase the efficiency of the TR2 mixer. Regarding the position of L1 I have not found any difference.

[Jeg]

Hi Franco

Thanks for the answer. What about if a commercial fm station transmits on the same frequency like your tuned input? Will your system saturate?

[FrancoItaly]

Hi Franco

Thanks for the answer. What about if a commercial fm station transmits on the same frequency like your tuned input? Will your system saturate?

Near the FM transmitters, a few hundred meters, the lrl is useless, too many false signals.

[Jeg]

Very useful notice tnks.

[Jeg]

Hi Franco
Just to tell you that your circuit is amazing. Great technique, and to mention that sensor circuit doesn't need any modifications at all!

Adjusted as to give me 1200mV at the output of sensor. Starts decreasing as i approach my hand close to the antenna at 40cm. When i finally touch it, it goes as down as 950mV. Almost 300mV decrement. Really great Franco. Thanks a lot. Its time for the indication stage.

ps. I solved my issue at the input. The increased oscillator's signal across the tank circuit was due to capacitive coupling. It came at the right levels when i isolated oscillator in a faraday type cage.:)

[FrancoItaly]

Hi Franco
Just to tell you that your circuit is amazing. Great technique, and to mention that sensor circuit doesn't need any modifications at all!

Adjusted as to give me 1200mV at the output of sensor. Starts decreasing as i approach my hand close to the antenna at 40cm. When i finally touch it, it goes as down as 950mV. Almost 300mV decrement. Really great Franco. Thanks a lot. Its time for the indication stage.

ps. I solved my issue at the input. The increased oscillator's signal across the tank circuit was due to capacitive coupling. It came at the right levels when i isolated oscillator in a faraday type cage.:)

I am happy that you have succeeded in the realization, of course the final and field testing. in the past I have also recommended shielding the entire box, including the handle, with grounded aluminum foil.

[Jeg]

I have also recommended shielding the entire box, including the handle, with grounded aluminum foil.

For sure it would contribute in to a more clean amplification of the effect, but if inside the box is not taken in consideration the interaction between oscillator and the rest of the device there would be no way for setting the input level at minimums (due to capacitive coupling). I used a 16Mhz crystal by the way. No stability problems and clean signalling. Tuned to 32Mhz.

[brain]

I think I detected the iron frequency 68,490 khz.

[Pahom]

I think I detected the iron frequency 68,490 khz.

What device did you do it

[kostas87]

Hello Franco !
we have made the original version, we replaced the coil 3 turns with tsok ferrite. I think it goes quite well at 2 maybe 1 meter from a buried object with a phenomenon..the setting is very marginal just before the last led hits and when I turn it to the sky it hits gently..I detect with a slight inclination to the ground. do you think this is a normal function?

[JHERICKU]

I am busy on a lrl working with a PIR
Good wishs for you and all[/QUOTE]

Hello sir..can u update about this project using pir on lrl..Thank u..

[FrancoItaly]

Hello Franco !
we have made the original version, we replaced the coil 3 turns with tsok ferrite. I think it goes quite well at 2 maybe 1 meter from a buried object with a phenomenon..the setting is very marginal just before the last led hits and when I turn it to the sky it hits gently..I detect with a slight inclination to the ground. do you think this is a normal function?

The operation is not correct, in the absence of a phenomenon the lrl must remain silent, however it is tilted. I don't think it is not a good idea to use a ferrite since we are in the FM range, around 100 Mhz, normal ferrites do not reach these frequencies.

[JHERICKU]

Hello Franco..I sent a private Message..this was regards to the partslist of your original lrl..I cannot visibly read the values especially ic1 and diodes..Thank u..

[kostas87]

The operation is not correct, in the absence of a phenomenon the lrl must remain silent, however it is tilted. I don't think it is not a good idea to use a ferrite since we are in the FM range, around 100 Mhz, normal ferrites do not reach these frequencies.

when there is no phenomenon there is no signal, you did not understand me..detects normally the phenomenon with very strong signals very close 1-2 meters when there is no problem when my direction is from north to south..but when I raise the antenna in the sky there is a signal from the sky..I make sure to adjust the device and have a signal up to the horizontal position.then I lower the device a little to the ground and the signal stops and I walk when I encounter a phenomenon the device emits a signal .. there is no signal continuously. ... basically I try to find the signals from the sky when they are connected to the earth ...

[FrancoItaly]

when there is no phenomenon there is no signal, you did not understand me..detects normally the phenomenon with very strong signals very close 1-2 meters when there is no problem when my direction is from north to south..but when I raise the antenna in the sky there is a signal from the sky..I make sure to adjust the device and have a signal up to the horizontal position.then I lower the device a little to the ground and the signal stops and I walk when I encounter a phenomenon the device emits a signal .. there is no signal continuously. ... basically I try to find the signals from the sky when they are connected to the earth ...

Usually the sky effect and the compass effect appear when there is too much amplification.

[FrancoItaly]

I put the original lrl again, as it was privately requested.

[JHERICKU]

Hello franco..Any idea about pcb e schema made by Dream man..is it ok to use?Thankbu in advance..

[mustefa ubram]

PCB FOR 20MHZ SENSOR;);)

[FrancoItaly]

Good work, Mustefa

[JHERICKU]

Because of the machine, I got a huge wealth, I detected a lot of gold and silver and bronze, if you haven't succeed in doing, you can ask me why, I will guide you how to adjust

Hi liudengyuand..how did u made the curicuit effective?can u tell us more..

[Jeg]

Hi liudengyuand..how did u made the curicuit effective?can u tell us more..




Hey Jhericku
The circuit is effective by itself. Franco designed it very nicely. You don't need to change anything. It confirmed that detects only noble metals and no iron! Mine, it also can not detect copper


Just tune it to a harmonic that gives a nice output and you are there. Location distance not more than 4-6 meters. Works every day no matter the conditions. It is just that depending on the day, the field sometimes is weaker but still detectable.


If anyone likes to go deeper on this, then i suggest you to use a simple voltmeter instead of leds.:)


ps. I use a 16MHz crystal by the way. No stability problems.