Lrl from Italy - Page 17

FrancoItaly · #**401** 11-23-2014, 03:39 PM

Hi brs,
I don't know what you mean, be more clear
Regards

brs · #**402** 11-23-2014, 05:02 PM

Underground metal period of time you need to be a phenomenon or emit ions
Sorry used Translator

FrancoItaly · #**403** 11-24-2014, 09:39 AM

In my test field 5 silver coins emit after about a month 2 meters away but I have not experience for other type of ground, I wait for some notice from who has builded my lrl.

Salar · #**404** 11-26-2014, 12:15 PM

Hi franco
Good day I am Salar from Tehran and new in forums.
I builded two copy of 4046 lrl but both of have one problem.In 3MHZ I don't have (1-6V)AC at point X with Oscilloscope only 0.5 V but when I decreased frequency about 200khz AC voltage appear above 1 V AC and pin 2 have (5.5V)DC . I used BC237 as TR1. where is problem?
Did you tested your quartz lrl in your test field and what was the result?
Regards,
Salar

FrancoItaly · #**405** 11-26-2014, 03:17 PM

HI Salar,
Instead of C8 and C9 put a single capacitor ( 2pF or more) for 1-6 V at point X with about 3 Mhz as vco frquency, BC237 is OK. The quartz lrl works well in my test field and is more easy to build and every quartz in 3 -10 mhz range is OK.

Regards

mahditala · #**406** 12-14-2014, 03:24 PM

Quote:

Originally Posted by Nicolas

Hi fanco here is your LRL. I make PCB to improve it and try to land with some modification on the choice of the frequency search.

And I give you the PCB to do and try.

please part list

mustefa ubram · #**407** 03-03-2015, 06:01 PM

hi franco
how are you.?
happy new years

with delay
What do you think about using a diode Varactor 22 Pico alternative?

FrancoItaly · #**408** 03-04-2015, 10:21 AM

I'm well but not yet in Italy, yes the varactor is a good idea, but tuning is not critical, 10 or 20 pF it's the same (in my country), also without capacitor it works well with the only base/emitter capacitance (about 10 pF).
Regards

mustefa ubram · #**409** 03-11-2015, 01:26 PM

Quote:

Originally Posted by FrancoItaly

also without capacitor it works well with the only base/emitter capacitance (about 10 pF).
Regards

i think is important 22pf capicator .this is for resonance frequency with L1
franco capacitance base/emiter!!!!??????????what is your mean?which transitor ?
please ore explane?

FrancoItaly · #**410** 03-11-2015, 07:53 PM

I mean the base-emitter capacitance of TR2 that is in parallel with C10 through C9.

wtrk · #**411** 03-16-2015, 11:25 AM

Thnaks...

darkman · #**412** 03-22-2015, 06:20 PM

Dear FrancoItaly
Thank you for sharing your lrl
I built this one i have silly question how its work ?????
the led is going on and off when i change the value of p3
but p1 and p2 didn't make any change at the led
how to test your lrl ??
how can i know that is working ?

best regard

FrancoItaly · #**413** 03-23-2015, 11:39 AM

With P1 you change the frequency, the better is about 2.5 - 3Mhz (the max frequency for CD4046). With P2 you change the amplitude of the signal, the better is at point (X) (the TR4 collector) a 2 -4 Volt peak to peak, with the scope you must have a good sine curve, not distorted. If you touch the antenna the output signal must decrease. You must have a test field with buried metals (gold, silver or copper) for at least a few months.
Regards

darkman · #**414** 03-25-2015, 06:20 PM

thx Franco bud for all this info's

i will try my best and will tell u the results very soon

Regards

du6r · #**415** 04-01-2015, 05:29 PM

Dear FrancoItaly
you have great work's with lrl
i just built one of your's with (IC)
on manual test with cell phone the led is lighting up
when i touch the antenna the led is get off
when did i know that the lrl is ready to start locating in range field
now is there any video show how to adjustment the p1 > p2 > p3??? or explain how to work with your lrl ? its seem to me its OK with hand test but what about detect metal
underground dose it working with metals in field range
**** From where can i take the signal line for display circuit (I mean the ic lrl)
how do i now that's the lrl is working in field
should the led light when i but golden ring close to antenna ?
too many question in my mind
can i get your e.mail plz i really need to contact with you

Sorry for my bad English
thank you

FrancoItaly · #**416** 04-02-2015, 09:48 AM

in a previous post I explained how to adjust P1 and P2, P3 is the adjustment of the threshold and also the sensitivity. All LRL only work with metals buried for some time, at least a few months. if you do not have a test field you can go to any place as you can with a metal detector and control every signal obtained with the LRL with the metal detector. If the signal is present for more than 10, 20 meters in the north south direction, his is the compass effect and you must therefore decrease the sensitivity. It should be recalled that the LRL is not a metal detector and therefore does not behave in the same way.
Regards

darkman · #**417** 04-03-2015, 10:46 AM

Now can i connect (display Stage) or (UV meter) To your lrl circuit(with ic) ? if yes , from what point can i get the signal? is it pin2 in ic1?

FrancoItaly · #**418** 04-03-2015, 11:23 AM

The display stage is composed by IC2A (phase amplifier) and IC2B (comparator and led driver). More led drivers or a vu meter must be connected at the IC2A output. At PIN 2 of IC1 there is a pulse signal with duty cicle that changes when the phase changes.
Regards

mustefa ubram · #**419** 04-06-2015, 08:34 PM

hi franco
What is the resonance frequency?(tank circuit)?

FrancoItaly · #**420** 04-07-2015, 09:50 AM

Approximately 150MHz, depends on the values of L1, C11, C10 (negligible) and the base-emitter junction of TR2 (about 10 pf).
Regards

mustefa ubram · #**421** 04-07-2015, 08:10 PM

Quote:

Originally Posted by FrancoItaly

Approximately 150MHz, depends on the values of L1, C11, C10 (negligible) and the base-emitter junction of TR2 (about 10 pf).
Regards

Why so much

FrancoItaly · #**422** 04-08-2015, 09:51 AM

perhaps in this range there are emissions in the frequency on which the phenomenon acts. It was a coincidence that my LRL works, is not due to my studies, I have just realized that this circuit (RF sniffer) could reveal the phenomenon. I tried to change some values, such as inductance, capacitance in the resonant circuit, crystal frequency (3 to 10Mhz), but the best are the ones that I have indicated.

Geo · #**423** 04-08-2015, 03:04 PM

Hello Franco. How are you????
Long time!!!!!!!.............

FrancoItaly · #**424** 04-08-2015, 03:23 PM

Hi Geo
I'm fine and you? In this time what did you do? you counted the gold coins that you are getting?

FrancoItaly · #**425** 04-08-2015, 03:34 PM

During this time I have not much time to look for treasures ... I'm waiting for someone who has built my LRL that can prove it on the ground. I'm also testing a type of PI metal detector that only works a few microseconds after the pulse, but it is difficult with the means available to a hobbyist. Currently I am in Switzerland but I come back Saturday for an electronics fair in Genoa where I always find something to buy, such as a bag with hundreds of electronic components to 1 euro...
Regards