Lrl from Italy

[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]

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]

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

[daniel]

Thanks Nicolas!

[daniel]

LRL2

I've built FrancoItaly's LRL2 from post 68. Instead of the stylus antenna I've used simple coil (like the one from FreePDK). See the attached photo.

I don't have buried metals but did test with TV and it works from 4 meters away and through concrete walls! Potentiometer P3 is super sensible but if adjusted well then if target is recognized it starts to blink. Maybe with a precision multiturn potentiometer it will be easier to adjust.

PS. With stylus antenna it does not react to TV.

[Nicolas]

Hi Daniel nice job and work. Use multiturn for precision is so better. And try to use ferrite coil with frequency 75khz is so better for gold
My congratulation

[FrancoItaly]

Hi daniel,
The test with the tv is not significant, my lrl with stylus antenna practically does not react to any signal, if not very close, but feels the phenomenon. I repeat once more that needs to be done tests with metals buried at least 1 month.
Regards

[mustefa ubram]

HI FRANCO
HOW ARE YOU DEARE FREIND?
What is the minimum and maximum voltage output in ic1a?
what is voltage range in output ic1a?