Lrl from Italy

[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.