Lrl from Italy

[FrancoItaly]

Yes, it's ok

[abdou2014]

THANK YOU Mr FRANCO FOR YOUR HELP

[FrancoItaly]

some suggestions

with my last LRL (I think is the tenth) I had to change the value of two capacitors to make it working. The heart of all the LRL is the high gain part consists of TR2, TR3 and TR4; if the gain is too large this part goes into oscillation and it's very unstable, if instead the gain is too low, the phenomenon is not revealed.I use the type BC183C transistors because I own a lot, but you can use equivalent types (BC109C, BC209C, BC239C and so on) the important thing is that they are NPN silicon with high "beta" (suffix "C"). The RF gain of the amplifier,for a certain range of frequencies, depends on the value of C13 and C14, the lowest value = less amplification and vice versa. I suggest using instead C2, C3 and C4, a single capacitor of 1 pF and measure the output signal (TR5 emitter), if the DC signal is zero should be increased C13 and / or C14 until a stable signal (from 1 to 5V is not critical), if the signal is still zero with C13 = C14 = 100nF increase the value from 1 pF to 1.8pF and repeat the process. In my case I used 1.8pF, and C13 = 33nF, C14 = 10nF. If the signal is unstable even removing the capacitor 1pF must decrease C13 and / or C14.The important thing to point out is that of not increasing too much the value of the capacitor consisting of C2, C3 and C4 in order to obtain a signal at the outputas in this way is masked the low gain of the transistors. As I said the optimum value is 1 ... 2pF or less and it is for this reason that I used three capacitors connected in series, in fact, for example, two capacitors connected in series 1pF give a capacity of 0.5pF
Regards

[darkman]

the output of TR5 is 2V , is it ok ?

i have got the same voltage .

[abdou2014]

1-when i turn threshold the leds will light one by one with a buzzer sound is it ok .
2-the output of TR5 is 2.7V and when i touch the antenna the signal didn't decrease, where i must seek for solve this problem .

[FrancoItaly]

What 'is the value of C2, C3 and C4 or individual capacitor you used?

[FrancoItaly]

uses a whip antenna or the antenna coil? for the tests is sufficient a piece of wire 30cm

[abdou2014]

C2=C3=C4= 1pF

[FrancoItaly]

If you remove C2, C3 and C4 there is still signal at the output? Touch the antenna is an empirically test so even if the signal does not decrease touching the antenna is possible that the LRL functions equally on the real ground.

[insight]

Again an absurd plan and people who waste your time there!
The same device that is sold as a locator of electromagnetic waves.
و هموطنانی که فقط وقتشون رو در انجمن فلزجو برای ساخت این جور ابزارآلات بیهوده تلف میکنن

[FrancoItaly]

I have said several times that my LRL is basically a "RF sniffer" but that amplifies the signal generated by an internal oscillator, the frequency is between 3 and 10Mhz. Many of us deal with LRL for several years and there is definitely a "phenomenon" that in some way is output from metals buried by time. I do not want to convince anyone, and I do not sell anything, I only accept constructive criticism from those who have realized my LRL and not by those who after seeing the circuit says it's a waste of time. You're the one who loses time in this thread.
Regards

[Qiaozhi]

Again an absurd plan and people who waste your time there!
The same device that is sold as a locator of electromagnetic waves.
و هموطنانی که فقط وقتشون رو در انجمن فلزجو برای ساخت این جور ابزارآلات بیهوده تلف میکنن

Personally I don't mind people wasting their own time designing and testing electronic LRLs. It's all part of the learning process, and it doesn't really cause any harm. However, L-rods are a different matter, as are blatant scams aimed at relieving others of their hard-earned money. Otherwise known as "wallet mining".

[folharin]

Personally I don't mind people wasting their own time designing and testing electronic LRLs. It's all part of the learning process, and it doesn't really cause any harm. However, L-rods are a different matter, as are blatant scams aimed at relieving others of their hard-earned money. Otherwise known as "wallet mining".

QIAOZHI! see you as an unbeliever of any projects.you thing is good electronic engineer your side vision for eletronic circuits.you should put your electronic knowledge showing the errors in each circuit.Long Range locators exist.i saw with my eyes!

[insight]

that's right

QIAOZHI! see you as an unbeliever of any projects.you thing is good electronic engineer your side vision for eletronic circuits.you should put your electronic knowledge showing the errors in each circuit.Long Range locators exist.i saw with my eyes!

i think all projects about long range that are without a primary source of propagation of electromagnetic waves are just a juck

[Qiaozhi]

QIAOZHI! see you as an unbeliever of any projects.you thing is good electronic engineer your side vision for eletronic circuits.you should put your electronic knowledge showing the errors in each circuit.Long Range locators exist.i saw with my eyes!

The error are not in the electronic circuits per se, but in the underlying principle.

What did you actually see with your [own] eyes? Remember - even if you're skilled in the art of identifying instances of self-deception, self-delusion, and selective memory; your eyes can still deceive you. That's how conjuror's make their living.

An LRL can be used to identify a general area in which to search, but a metal detector is then used to pinpoint the target. Once a target is recovered, the glory goes to the LRL, and the metal detector is conveniently forgotten when the story is retold. You might as well throw a stone, and then search the area were the stone lands. You will achieve the same results.