Lrl from Italy

[FrancoItaly]

HI Bill512,
If you are sure that in the presence of metals buried by the time the LED goes out, then you have to connect R5 to pin not inverting of LM358 and the cursor of P3 to R6 (inverting pin). While the phenomenon always causes an increase of the signal is possible that the phase change is acting contrary to your Llrl or in your country. In my LRL output of the CD4046 (pin 2) there is a negative change that is reversed by the LM358 because it is necessary that the signal increases to turn on the LED.
regards

[mustefa ubram]

hi franco
I'd attach a uv meter with microcontroller for 8mhz circuit .I want to know what part of input uv meter should be connected of 8mhz circuit?
Is located in the center of the phenomenon changes the overall frequency of the oscillator?

[Bill512]

Originally Posted by Geo

Hey Bill artist....

thanks Geo.
Probably, this LRL it will be a nice experimental instrument.

[Bill512]

Originally Posted by FrancoItaly

HI Bill512,
If you are sure that in the presence of metals buried by the time the LED goes out, then you have to connect R5 to pin not inverting of LM358 and the cursor of P3 to R6 (inverting pin). While the phenomenon always causes an increase of the signal is possible that the phase change is acting contrary to your Llrl or in your country. In my LRL output of the CD4046 (pin 2) there is a negative change that is reversed by the LM358 because it is necessary that the signal increases to turn on the LED.
regards

thanks for the reply Franco.
For the moment, I will leave it "as is".
The point is to find buried metals and explore further the associated phenomena.
So, the inverted output is not a big issue.

[Geo]

Bill, did you test it at Leon's field test???
It must locate the buried gold coin

Regards

[FrancoItaly]

Hi Mustefa,
You can connect the Vmeter at the out of IC1A.
Regards

[mustefa ubram]

Originally Posted by mustefa ubram

franco in your lrl with 8mhz frq and cap 22p The inductance L1 is about 180 Nanohenries ?true?
http://chemelec.com/Calculators/LC-Calculator.htm

franco i think this is mistak.with cap 22p and 180nh resonance is for L1 79mhz.for 8mhz we need 18microhenri self.with this resonance we need 18turn of 1mm wire with 1cm diameter.
What is opinion?

[Bill512]

Originally Posted by Geo

Bill, did you test it at Leon's field test???
It must locate the buried gold coin

Regards

not yet George, but I think that it would be a difficult task - this gold coin is buried deep (+90cm).

[reza vir]

If you use coins from 1 to 10 cm
If the number of coins you in more depth
Depending on the size and durability of metal in the soil Zaid

[Geo]

Originally Posted by Bill512

not yet George, but I think that it would be a difficult task - this gold coin is buried deep (+90cm).

Yes it is deep but we catch the phenomenon with the other lrl....

[Geo]

Originally Posted by FrancoItaly

Hi HOBBIT
Tune P1 for about 3Mhz, tune P2 for about 1-6V (AC signal) at point X and at pin2 (phase comparator output) a DC signal 0.5-6V. This is not a metal detector and hand tests serve little. As I said and I repeat here there is no other way to test the lrls, you must have a long buried metal that is in same place at least a few months (for my experience) or to know a place where there is surely a long buried metal. An empirical system is exploiting the compass effect, you need to adjust the gain towards the maximum sensitivity until you have the compass effect then you have to lower the gain until it disappears. This happens with my lrl.
Best Regards

Hi Franco.
Yesterday i tried to adjust the lrl properly.
It was unable to make it oscillate at 3 Mhz so i replace the capacitor from 68p to 47 pf.
Now output at pin 3,4 is square signal 3 mhz. Signal at point X is triangular 6V but at pin2 is not DC but a not clear triangular. Is it right???

Regards

[reza vir]

Hey why do not you instead of 8 MHz to 3 MHz frequency do you use?
Do you have any particular reason?
Most devices operate below 1 MHz?

[Nicolas]

Originally Posted by Geo

Hi Franco.
Yesterday i tried to adjust the lrl properly.
It was unable to make it oscillate at 3 Mhz so i replace the capacitor from 68p to 47 pf.
Now output at pin 3,4 is square signal 3 mhz. Signal at point X is triangular 6V but at pin2 is not DC but a not clear triangular. Is it right???

Regards

Correct Geo and this is not right !!!!! Waiting our Colleagues Franco to explain this
Than Geo

[Geo]

Originally Posted by reza vir

Hey why do not you instead of 8 MHz to 3 MHz frequency do you use?
Do you have any particular reason?
Most devices operate below 1 MHz?

Schematic with PLL (4046) works at 3 Mhz not 8 Mhz.
At 8 Mhz works other schematic that uses Xtal.

[reza vir]

Thanks Geo
Which of the three circuits are better looking?
Regards

[Geo]

Look at #302, 8Mhz sensor stage...

[FrancoItaly]

Hi Geo,
It's correct the capacitor for VCO of CD4046, it depends on type of IC, the phase comparator output (pin 2) is an AC signal, is normally a rectangular wave with variable duty cycle, but at the maximum frequency of the CD4046 can also be triangular, however, I am referring to a measure DC voltage rms value. As for the output X is perhaps better a lower value to make sure that there is no saturation, to achieve what should be decreased P2, if in spite of this you do not have a result decrease C8 and C9 and as a last resort you have to disconnect C8 or C9, in this way will be the parasitic capacitance to bring the signal to the base of TR2. I built 2 copies of this LRL and work well but I realize that it is more simple to build version with the quartz oscillator. The oscillator frequency is not critical and it goes from 3Mhz to 10Mhz may be necessary to change the value of C1 in the oscillator stage. I want to add that to be sure that the amplifier stage does not come in oscillation you have to use a double-sided pcb, the lower side connected to ground and the components soldered on the top side and you have to use another pcb for oscillator stage. I hope that with this aid all of you can build my LRL.
Best Regards

[mustefa ubram]

Hi franco thank you for replays.
please read post 307

[indiana jones]

Today I made the lrl Franco.

pcb is ready

[mustefa ubram]

this is my new pcb of lrl franco.2 layers and with pulygan

[daniel]

Wow great work Indiana & Mustefa!

Does someone have this *.lay file from FrancoItaly 2nd LRL please? I want to build the device but Im using a DIY CNC router to create PCB.

[FrancoItaly]

Hi Mustefa,
The resonant frequency of L1 and 22pF capacitor is not connected with the oscillator frequency but is related to the phenomenon and is quite critical and perhaps depends on the country. In my country and in Switzerland also work well for L1 2 turns, but do not turn 1 and not working 47-68-82pF capacitors. Great work for your pcb and for this of Indiana Jones.
Best Regards

[indiana jones]

[QUOTE=daniel;150214]Wow great work Indiana & Mustefa!

Does someone have this *.lay file from FrancoItaly 2nd LRL please? I want to build the device but Im using a DIY CNC router to create PCB.



I have this file in .pcb for pcb wizard

[daniel]

[QUOTE=indiana jones;150216]

Originally Posted by daniel

Wow great work Indiana & Mustefa!

Does someone have this *.lay file from FrancoItaly 2nd LRL please? I want to build the device but Im using a DIY CNC router to create PCB.


I have this file in .pcb for pcb wizard

That would also be great! I will then download the trial version of PCB Wizard. Thank you very much Indiana.

[Nicolas]

Originally Posted by daniel

Wow great work Indiana & Mustefa!

Does someone have this *.lay file from FrancoItaly 2nd LRL please? I want to build the device but Im using a DIY CNC router to create PCB.

Hi Daniel I have find you this For Franco LRL2