Lrl from Italy

[havoc88]

The antenna PCB and parts overlay.
PCB size 2cm X 2cm

[FrancoItaly]

Originally Posted by havoc88

The antenna PCB and parts overlay.
PCB size 2cm X 2cm

this is a good job, a valuable help for those who are not very practical with electronics and this is also the spirit with which I started this thread, in fact I decided to make available to all my lrl both in the spirit of open source and both because it could improve with the help of all the members. The original project was born by chance with the sensor stage that self-oscillating, but it was quite critical and dependent on the design of the pcb, later I added the quartz oscillator and the version with CD4046, in which we measure the phase variations and not the variations in amplitude. The last improvement is the antenna amplifier, made by a member of this forum, as I said before it is a circuit that amplifies the "phenomenon" and that makes the tuning of the sensor stage less critical, because in this way it is not necessary to obtain the maximum gain at the sensor stage, with the risk of self-oscillation.

[havoc88]

Mr. Franco we appreciate your goodwill to share your work and your knowledge with us.

[VECTROUM]

Thank you Havoc88 you are superb.
Thank you also Francoitaly for your excellent job on this lrl.
I have completed building it and i noticed that is very sensitive to the horizons.

[FrancoItaly]

Originally Posted by VECTROUM

Thank you Havoc88 you are superb.
Thank you also Francoitaly for your excellent job on this lrl.
I have completed building it and i noticed that is very sensitive to the horizons.

As I said in "helps.txt" you have to reduce gain until the compass effect disappears.

[FrancoItaly]

I modified the coupling between the antenna and the amplifier stage with a second coil wound on L1 (I call it L2), in this way there is a better adaptation between the impedances in play and ultimately a greater gain and a better selectivity. In this way there is a greater amplification for the "phenomenon" but not for the compass effect. At the moment I have no way of trying other changes that I leave to you as a task. In my prototype I did not put C10 (there is only the base / emitter capacitance). You can try to put a capacitor in parallel with L2 in order to tune it as L1 / C10, this may be in the 22pF-47pF range. L2 is wound over L1 and you can use a plastic holder on which to wrap first L1 (3 turns) and then L2 (2 turns).

[VECTROUM]

Hello, i want to connect a meter in order to visualize sensor readings and i want to ask in wich output i have to connect it.

Thank you in advance.

[FrancoItaly]

Originally Posted by VECTROUM

Hello, i want to connect a meter in order to visualize sensor readings and i want to ask in wich output i have to connect it.

Thank you in advance.

You can connect a meter at output of sensor stage (TR5 emitter).

[VECTROUM]

Thank you for your awnser, may i ask wich pin of bc183c is the output?
e,c, or b?

Thank you in advance.

[FrancoItaly]

Originally Posted by VECTROUM

Thank you for your awnser, may i ask wich pin of bc183c is the output?
e,c, or b?

Thank you in advance.

e = emitter.

[VECTROUM]

Thank you mr.Franco.

I made the display stage with 3 leds based on the drawing of this post #2142, but i have a problem.
The buzzer rings(in low volume) even with the led of.
I have power 0f 1.25v on the buzzer even with the potenciometer in the lower setting.
I cant find any mistake, do you have something in mind about that?

Thank you in advance.

[FrancoItaly]

Originally Posted by VECTROUM

Thank you mr.Franco.

I made the display stage with 3 leds based on the drawing of this post #2142, but i have a problem.
The buzzer rings(in low volume) even with the led of.
I have power 0f 1.25v on the buzzer even with the potenciometer in the lower setting.
I cant find any mistake, do you have something in mind about that?

Thank you in advance.

put 2 or 3 diodes (low signal type) in series with buzzer or 2.2V zener.
the mistake is that the buzzer rings also with low voltage and that the operational output is not 12V but less.

[VECTROUM]

Hello mr.Franco.
I followed your correctionts and everything work ok.
I want to ask if it is possible to connect arduino as display
Device in order to visualise the values.

Thsnk you in advance.

[FrancoItaly]

Originally Posted by VECTROUM

Hello mr.Franco.
I followed your correctionts and everything work ok.
I want to ask if it is possible to connect arduino as display
Device in order to visualise the values.

Thsnk you in advance.

Yes is possible to use arduino as display.

[VECTROUM]

Originally Posted by FrancoItaly

Yes is possible to use arduino as display.

Hello, i made the lrl as suggested, by following the helps but its still very sensitive to compass effect.
I have to lower the gain so much that is not catching the phenomenon.

[FrancoItaly]

Originally Posted by VECTROUM

Hello, i made the lrl as suggested, by following the helps but its still very sensitive to compass effect.
I have to lower the gain so much that is not catching the phenomenon.

Yes, too much amplification causes the compass effect, on the other hand I think the compass effect is part of what we call "phenomenon". The phenomenon "emerges" from that flow of energy that flows in the south / north direction, perhaps caused by the solar wind. If there is no phenomenon the flow is uniform and the lrl (which is immersed in this flow together with our body) reveals nothing. Currently I'm trying to understand if it is possible to reduce the compass effect, in this way it would be possible to increase the gain of the lrl. After all, it's the same thing you do with metal detectors where the effect of the ground is neutralized.

[Arash]

Hello Mr Franco
When this circuit is more sensitive to receiving frequency، Also is it more sensitive to the phenomenon?

[VECTROUM]

Originally Posted by FrancoItaly

Yes, too much amplification causes the compass effect, on the other hand I think the compass effect is part of what we call "phenomenon". The phenomenon "emerges" from that flow of energy that flows in the south / north direction, perhaps caused by the solar wind. If there is no phenomenon the flow is uniform and the lrl (which is immersed in this flow together with our body) reveals nothing. Currently I'm trying to understand if it is possible to reduce the compass effect, in this way it would
be possible to increase the gain of the lrl. After all, it's the same thing you do with metal detectors where the effect of the ground is neutralized.

I noticed that the lrl is catching the east/west line and not the north/south.

[FrancoItaly]

Originally Posted by Arash

Hello Mr Franco
When this circuit is more sensitive to receiving frequency، Also is it more sensitive to the phenomenon?

This is what I want to try, that is, if there is a frequency which the lrl is insensitive to the phenomenon but not to the compass effect.

[FrancoItaly]

Originally Posted by VECTROUM

I noticed that the lrl is catching the east/west line and not the north/south.

Are you sure it's the compass effect? There is also the sky effect that manifests itself by tilting the lrl upwards. The compass effect is recognized because proceeding in the north / south axis the signal always has the same intensity. However, reducing the gain these effects must disappear.

[zakari]

HI FRANCO ITALY

I WISH YOU AND YOUR WIFE TO BE OKY
I NOTICED IN YOUR CIRCUIT THE SELF OSCILATION IS VARIABLE AND NOT FIX DURING THE DAY AND NIGHT THERE FOR I PUT THE SWITCH KEY BEFORE OF 330 OHM RESISTOR OF CRISTAL AND ONE DOUBLE VOLUME 5KILO INSTEAD OF 1KILO RESISTORS OF TR3&TR4
FIRST I SWITCH OFF THE VOLTAGE OT XTAL THEN WITH VOLUME ADJUST THE OUTPUT VOLTAGE NEAR THE ZERO THEN SWITCH ON THE KEY

WITH THIS OPERATION I CONTROL SELF OSCILATION AND STABILITY OF CIRCUIT
EXCUSE ME FOR MY BAD ENGLISH




BEST REGARD
ZAKARI

[FrancoItaly]

[QUOTE=zakari;157199]HI FRANCO ITALY

I WISH YOU AND YOUR WIFE TO BE OKY
I NOTICED IN YOUR CIRCUIT THE SELF OSCILATION IS VARIABLE AND NOT FIX DURING THE DAY AND NIGHT THERE FOR I PUT THE SWITCH KEY BEFORE OF 330 OHM RESISTOR OF CRISTAL AND ONE DOUBLE VOLUME 5KILO INSTEAD OF 1KILO RESISTORS OF TR3&TR4
FIRST I SWITCH OFF THE VOLTAGE OT XTAL THEN WITH VOLUME ADJUST THE OUTPUT VOLTAGE NEAR THE ZERO THEN SWITCH ON THE KEY

WITH THIS OPERATION I CONTROL SELF OSCILATION AND STABILITY OF CIRCUIT
EXCUSE ME FOR MY BAD ENGLISH

If the sensor stage is correctly set up and calibrated, there must be no problems, such as differences in operation between day and night or different types of terrain. As suggested by a member during calibration, the antenna amplifier must be disconnected and once connected it is necessary to adjust the potentiometer (trimmer) for maximum sensitivity which is not necessarily the maximum gain. You talk about auto oscillation, but the sensor stage does not have to be in oscillation, it just has to amplify the signal coming from the quartz oscillator. You must follow everything I suggest in the helps.

[lord]

Originally Posted by detectoman

morgan: i cant understand very good to you, how put you the capacitors, in serie coil or in parallel? if you put in parallel modifing frecuence? in serie what can happen? any know? thanks i havent a frecuence generator, how you see at what frecuence resonate the rx?

hi my friend



what the best frequency for gold detect ?


how to build that frequency ?


how to make filter for receiver frequency ?


for detect 2m -3m underground detect >


Thanks form you

[edward]

hi
dear franco

i built your lrl the output voltage on tr5 emitter is 4 volts The machine has a reaction to
Fluorescent lamps from 10 cm
I tested your lrl on the 2 grams buried gold at 10 cm depht that was buried two years ago but no reaction
also i tested this on buried 15 * 15 cm copper bowl at 60 cm depht that was buried 4 years ago but no reaction
One of my friends built your device and tested it with a 1 watt fm transmitter on an ancient site i have this test clip send me your email to send this clip to you
But one thing in my friend's test is ambiguous for me He put a volt meter on the front panel. When he turns on the lrl, the volt meter shows zero, and when he approaches to the target the voltage rises to 10 volts
In your opinion, where can Volmetter be installed?
regards

[FrancoItaly]

Originally Posted by lord

hi my friend



what the best frequency for gold detect ?


how to build that frequency ?


how to make filter for receiver frequency ?


for detect 2m -3m underground detect >


Thanks form you

if you are referring to my lrl there is not a particular frequency for gold and I think we have a sensitivity over the meter, especially for metals buried for hundreds of years.