Lrl from Italy

[Nicolas]

Hi Franco

My congratulations to the new LRL
It seems more effective than the first and most powerful stable and saw the amplification
good research and victory

[Nicolas]

Hi Franco I used your type of antenna in my LRL became more sensitive and even the distance increases by 30%
but I ultisé another thing. I introduced in the coil in the plastic tube a normal antenna (see photo). it has become more sensitive, and thus increases the distance

Thank you for this idea. and I try to test your new LRL

So I want the schema to ten LEDs with the circuit LM3914
question after you if the voltage detection increases the LEDs light as a VU meter?
and if necessary to add an audible alarm (audio) if the target is detected further vusiel signal (LED).

[Geo]

Hi Franco.
Do you think that a ground plated pcb will work better???
See an example...

Regards

[FrancoItaly]

Hi GEo and Nicolas and others interested
Yes the voltage detection increases the LEDs light as a VU meter and then you can use a Vu meter, I think that isn't necessary to add an audible alarm, indeed It can be annoying as it's a no motion search. Perhaps a ground plated pcb will work better, but I think that it's better to shield the box, in fact I have a signal with my hand close to the box. In other Lrls I shielded the box with aluminium foil. I want to try the Nicolas' solution for the antenna and also I want to try a 200 mm ferrite rod.

Best Regards

[detectoman]

francoitaly, very much congratulations by your project, semms interstant, regard from mexico, dman

[FrancoItaly]

Hi Detectoman
I hope that other people can build this Lrl and realise that the "phenomenon" actually exists though it is not the same thing as using a metal detector.
I try to understand what is the "phenomenon" in order to build more sensitive Lrl and with discrimination. the heart of the circuit is around TR2 - C10-C11 and L1. The phenomenon, captured by the antenna, influences the signal that goes to ground but I cannot understand what kind of signal it is.
Best Regards

[detectoman]

first happy new year 2014 at all, hello franco, i think around a metal buried exist a point of rf arrive in energies caming from very much sites, trasmisions, include the sun, this do a electric disbalance around and above in most force near of this centrals point, too any electrons go whit the air due this at statics, then the sensitive and appropiate receptors go in disbalance put action in alarm, i send all a embrace and my major wisses in these day, i desire moderation and calm no drive when drink please is´all dman mexico

[detectoman]

franco: too a buried ring or a a circular field coins secuence is doing a coil, these influence does in short circuit whit the circundant energy of any electronical apparatus circuit, due the earth have a standar superficial´ polarization then when you travel near and pass, on these artificial field, here exist a radiant desestabilizament of regular poles magnetic general radiations, all consist a different modes of detection in the circuit constructions and transistor type bimetalic particularities regards

[mustefa ubram]

hi francoitaly
happy new year
I became interested in the circuit
Please explain how this circuit function?
What is the phenomenon?
I want to start building?But first, I want to inquiry
Please explain about this circuit?
It can really help to find buried metals?
How?
BEST WISH

[FrancoItaly]

Hi mustefa ubram
The signal coming from the VCO of IC1 goes to the TR2 base and then it's amplified by TR3 and TR4, the TR4 collector goes to phase comparator of IC1 with the out of VCO. At pin 2 of IC1 there is a signal corresponding to phase difference, this signal is inverted and amplified by Ic2. Part of signal of VCO goes to ground by C10 - C11 and L1. The "phenomenon" changes the phase and the amplitude of the signal. This Lrl detects the phase change while my previous Lrls detect amplitude change. In my test field I have a strong signal at about 3 m from my buried silver coin and also near the target if I take the antenna perpendicular to the ground. Obviously the Lrl detects also other signals, near radio transmitter and at home, but in open field there are very few "strange" signals.
Best Regards

[mustefa ubram]

hi francoitaly
tank you very much for reply.
phenomenon:
Location of buried metal changes the amplitude and phase of the signal?
What is the source signal?
Which signal?

[FrancoItaly]

The signal comes from VCO of IC1, the phenomenon is around buried metals for some meters and the antenna catch the phenomenon and changes something in the TR2 stage and the result is a phase change. I don't know which signal is the phenomenon. The Lrl (as the other Lrls) is a passive receiver/trasducer.

[Sneshko]

Hi mustafa ubram!
For "Phenomen" see:

http://www.njminerals.org/metaldetecting-haloeffect.html

and:

http://www.longrangelocators.com/forums/showthread.php?t=15501

and
Happy New Year
Regards!

Sneshko

[mustefa ubram]

Hi mustafa ubram!
For "Phenomen" see:

http://www.njminerals.org/metaldetecting-haloeffect.html

and:

http://www.longrangelocators.com/forums/showthread.php?t=15501

and
Happy New Year
Regards!

Sneshko

tank you very much
happy new year

[mustefa ubram]

Obviously the Lrl detects also other signals, near radio transmitter and at home, but in open field there are very few "strange" signals.
Best Regards

Why do not you use a filter?