Lrl from Italy

[FrancoItaly]

Originally Posted by 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

It is possible that the lrl is not sensitive enough, you followed the instructions of my helps.txt? Did you follow the north / south direction for research? The digital display can be connected to the output of the first operational where the threshold is set.

[lord]

Originally Posted by FrancoItaly

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.

how to work pulse induction detector for deep detect?

[FrancoItaly]

Originally Posted by lord

how to work pulse induction detector for deep detect?

With pulse induction metal detectors you can use very large heads, even more than 1 meter in diameter, and then you can get a great depth, even over 2 m. for large enough objects.

[edward]

Originally Posted by FrancoItaly

It is possible that the lrl is not sensitive enough, you followed the instructions of my helps.txt? Did you follow the north / south direction for research? The digital display can be connected to the output of the first operational where the threshold is set.

i read your help.txt file and all pages of this threat then I made your lrl accurate
I found that the output voltage (emitter transistor 5) should be between 4 and 6 volts
Also, the sensitivity is directly related to capacitors c2,c3,c3, When i reduce the amount of these 1pf capacitors, for example, 4 or 5 in series, instead of 3 this will increase the sensivity ( when i touch the antenna the output voltage falls about 0.4 volts and when mobile phone is calling the lrl responds from 50 cm distance)
but the main problem is that by reducing the amount of these capacitors the output voltage falls below 3 volts and this is not in accordance with the instruction
but when i added the antenna amplifire the output voltage does not drop by touching the antenna but the lrl reacts when mobile phone calling from 2 meters

in your opinion how can sensivity be increased without reducing the output voltage???
this is my lrl
http://www.longrangelocators.com/for...1&d=1540651347

[lord]

Originally Posted by FrancoItaly

With pulse induction metal detectors you can use very large heads, even more than 1 meter in diameter, and then you can get a great depth, even over 2 m. for large enough objects.

thank you every much my friend

[kazımabı67]

Originally Posted by FrancoItaly

"supposed target" it is not the best test, you have to bury for example silver objects in a land free from metals, best first pass with the metal detector. After 1 month or more the phenomenon is noticeable.

hı.franco :which terminal of the lm358(-.+.end put)?thanks

[FrancoItaly]

Originally Posted by edward

i read your help.txt file and all pages of this threat then I made your lrl accurate
I found that the output voltage (emitter transistor 5) should be between 4 and 6 volts
Also, the sensitivity is directly related to capacitors c2,c3,c3, When i reduce the amount of these 1pf capacitors, for example, 4 or 5 in series, instead of 3 this will increase the sensivity ( when i touch the antenna the output voltage falls about 0.4 volts and when mobile phone is calling the lrl responds from 50 cm distance)
but the main problem is that by reducing the amount of these capacitors the output voltage falls below 3 volts and this is not in accordance with the instruction
but when i added the antenna amplifire the output voltage does not drop by touching the antenna but the lrl reacts when mobile phone calling from 2 meters

in your opinion how can sensivity be increased without reducing the output voltage???
this is my lrl
http://www.longrangelocators.com/for...1&d=1540651347

Decreasing the total value of C2 / C3 / C4 decreases the output signal but not the gain, then you can have, varying C2 / C3 / C4, for example 3V or 4V or 6V but the gain does not change and therefore the performances are the themselves. It is normal that by adding the antenna amplifier the lrl does not react anymore to the antenna touch, so first you need to calibrate the sensor stage in the original version, then with the antenna connected to the base of TR2 and then connect the antenna amplifier. As I have already said, the antenna amplifier allows you not to push the gain of the sensor stage as much as possible, with the risk of self-oscillation. In fact, the minor amplification will be compensated by the amplifier antenna.

[FrancoItaly]

Originally Posted by kazımabı67

hı.franco :which terminal of the lm358(-.+.end put)?thanks

Pin 4 = -V
Pin 8 = +V
Pin 1 = out 1
Pin 2 = in1 -
Pin 3 = in1 +
Pin 5 = in2+
Pin 6 = in2 -
Pin 7 = out 2

[HaFar2010]

Hello
Dear All.
I have a request. Please share PCB of Mr. Franco's LRL.
Thanks

[HaFar2010]

please PCB component

[edward]

Originally Posted by FrancoItaly

Decreasing the total value of C2 / C3 / C4 decreases the output signal but not the gain, then you can have, varying C2 / C3 / C4, for example 3V or 4V or 6V but the gain does not change and therefore the performances are the themselves. It is normal that by adding the antenna amplifier the lrl does not react anymore to the antenna touch, so first you need to calibrate the sensor stage in the original version, then with the antenna connected to the base of TR2 and then connect the antenna amplifier. As I have already said, the antenna amplifier allows you not to push the gain of the sensor stage as much as possible, with the risk of self-oscillation. In fact, the minor amplification will be compensated by the amplifier antenna.

thank you for your reply mr franco

i did not notice the self oscillation test ( measuring of output voltage in tr5 emitter)??? should the measurement be with antenna or without the antenna????
With the antenna and without quartz I have 3 volts on the emitter of transistor 5, and when I disconnect the antenna, the voltage is zero.

[FrancoItaly]

Originally Posted by edward

thank you for your reply mr franco

i did not notice the self oscillation test ( measuring of output voltage in tr5 emitter)??? should the measurement be with antenna or without the antenna????
With the antenna and without quartz I have 3 volts on the emitter of transistor 5, and when I disconnect the antenna, the voltage is zero.

The self oscillation test must be with antenna.

[edward]

Originally Posted by FrancoItaly

The self oscillation test must be with antenna.

I replaced c13 and 14 with a smaller quanities(470 or 330 pf) but there is no chande in output voltage
What is your opinion mr franco?

[FrancoItaly]

Originally Posted by edward

I replaced c13 and 14 with a smaller quanities(470 or 330 pf) but there is no chande in output voltage
What is your opinion mr franco?

You must increase C13/C14 for more gain.

[edward]

Originally Posted by FrancoItaly

You must increase C13/C14 for more gain.

I have 3 volts in output with antenna and without quarts
So the sensor is self oscillation to avoid the self oscillation i need to zero the voltage i should decrease the c13 and c14 (according to help file)
But with decreasing c13 and c14 there is no change in output voltage

[FrancoItaly]

Originally Posted by edward

I have 3 volts in output with antenna and without quarts
So the sensor is self oscillation to avoid the self oscillation i need to zero the voltage i should decrease the c13 and c14 (according to help file)
But with decreasing c13 and c14 there is no change in output voltage

Try R10 = R12 = 1.5K for less gain.

[edward]

Originally Posted by FrancoItaly

Try R10 = R12 = 1.5K for less gain.

I replaced r10 and r12 with 1.5 kohm but the output voltage is yet 3 volts

[FrancoItaly]

Originally Posted by edward

I replaced r10 and r12 with 1.5 kohm but the output voltage is yet 3 volts

Maybe the transistors have a too high amplification, try to use BC183B or BC549B for TR3 and TR4. Did you use the double-sided pcb with the lower face connected to the negative? If the sensor stage self oscillates too easily the fault can be of the pcb.

[edward]

Originally Posted by FrancoItaly

Maybe the transistors have a too high amplification, try to use BC183B or BC549B for TR3 and TR4. Did you use the double-sided pcb with the lower face connected to the negative? If the sensor stage self oscillates too easily the fault can be of the pcb.

I used bc183c for tr1 to tr5

[FrancoItaly]

Originally Posted by edward

I used bc183c for tr1 to tr5

As I said try to use BC183B or BC549B for TR3 and TR4.

[FrancoItaly]

Originally Posted by FrancoItaly

As I said try to use BC183B or BC549B for TR3 and TR4.

Also try C13/C14 = 220pF or 100pF

[edward]

Originally Posted by FrancoItaly

Also try C13/C14 = 220pF or 100pF

I used 470 pf instead of 560 pf the voltage falls about 0.3 volts

[FrancoItaly]

Originally Posted by edward

I used 470 pf instead of 560 pf the voltage falls about 0.3 volts

The voltage must be about 0 volt, 0.3 V at the output means that there is at least 1 V of alternating voltage on the collector of TR4, the voltage drop of the diodes must be taken into account. As I said, put C13 / C14 = 220 pF or 100 pF.

[edward]

Originally Posted by edward

I used 470 pf instead of 560 pf the voltage falls about 0.3 volts

[edward]

i tested 100 pf the voltage is about 1 volts when i put 20 pf for c13 and c14 the output is 0 volt but there is another problem when i connect the quartz the output is 0.6 volts