Lrl from Italy

[taher5739]

I buried silver and gold objects in my test field. Silver, buried for about 2 years, responds well, while gold, which has been buried for less than a year, responds little. In my previous test field (not here but in Italy and that I no longer have available) instead the gold responded well and it was a thin bracelet.
The amplifier antenna increases the sensitivity for all metals and I do not believe that the addition of a filter can be useful, however I did not do this test.

Thank you so much Mr. Franco
We love you in Iran

[mc_307]

Hello my friends. 22k pot and 470k pot settings way? What Very good settings?

[FrancoItaly]

Hello my friends. 22k pot and 470k pot settings way? What Very good settings?

what are you referring to ?

[teo]

[teo]

franco is okay

[mc_307]

what are you referring to ?

How to adjust potentiometer settings?

[FrancoItaly]

How to adjust potentiometer settings?

P1 (22K) is the threshold, it must be adjusted to have all the LEDs off, it also acts as a sensitivity control. P2 is the gain control, in the past I advised to change R1 (from 150K to 56K) and R2 (220K to 560K) to have more gain. To have a more precise threshold adjustment I recommend adding RA and RB. Their value depends on the output voltage of the sensor stage. The optimal value is when the first LED lights up with the maximum control.
If it is necessary to decrease RA (for example from 22K to 15K) increase RB (from 22K to 27K) in order to keep the divider value constant (Ra + RB + P1). Vice versa if it is necessary to increase RA.

[mc_307]

P1 (22K) is the threshold, it must be adjusted to have all the LEDs off, it also acts as a sensitivity control. P2 is the gain control, in the past I advised to change R1 (from 150K to 56K) and R2 (220K to 560K) to have more gain. To have a more precise threshold adjustment I recommend adding RA and RB. Their value depends on the output voltage of the sensor stage. The optimal value is when the first LED lights up with the maximum control.
If it is necessary to decrease RA (for example from 22K to 15K) increase RB (from 22K to 27K) in order to keep the divider value constant (Ra + RB + P1). Vice versa if it is necessary to increase RA.

thanks..

Should the franco LRL box be combined with gnd? as in your message on page 12

[FrancoItaly]

thanks..

Should the franco LRL box be combined with gnd? as in your message on page 12

Yes.

[mc_307]

Yes.

hello Franco;
I make your Lrl.

P1 1. pin 22k added, 3. pin 22k added.
Need to change r1 and r2? (R1 (from 150K to 56K) and R2 (220K to 560K) ?

[FrancoItaly]

hello Franco;
I make your Lrl.

P1 1. pin 22k added, 3. pin 22k added.
Need to change r1 and r2? (R1 (from 150K to 56K) and R2 (220K to 560K) ?

Yes, for more gain.

[taher5739]

hi dear Franco
I built your first circuit for curiosity But I have no voltage at the output.
my question is whether the bottom strips connected to ground circuit?
I have voltage in transistors 1, 2 and 3, but transistor 4 does not have voltage.
In addition i made your 8Mhz quartz oscillator circuit and works well
Thanks for your reply

[FrancoItaly]

hi dear Franco
I built your first circuit for curiosity But I have no voltage at the output.
my question is whether the bottom strips connected to ground circuit?
I have voltage in transistors 1, 2 and 3, but transistor 4 does not have voltage.
In addition i made your 8Mhz quartz oscillator circuit and works well
Thanks for your reply

In practice my lrl is a high gain amplifier for the 8Mhz signal mixed with the "phenomenon". If the quartz oscillator works properly the lack of signal at the output means that there is not enough amplification. Transistors must be of the BC183C or BC547C type or equivalent with a beta greater than 500. The amplification can be increased by increasing the value of C13 / C14 and decreasing R10 / R12. Before doing this you can increase C2 / C3 / C4 which establish how much signal will be amplified, you can only leave C2, or only C2 / C3 so as to have 1pF or 0.5pF respectively. Yes the bottom sideb is connected to ground, it is a screen to reduce the possibility of self-oscillation.

[taher5739]

In practice my lrl is a high gain amplifier for the 8Mhz signal mixed with the "phenomenon". If the quartz oscillator works properly the lack of signal at the output means that there is not enough amplification. Transistors must be of the BC183C or BC547C type or equivalent with a beta greater than 500. The amplification can be increased by increasing the value of C13 / C14 and decreasing R10 / R12. Before doing this you can increase C2 / C3 / C4 which establish how much signal will be amplified, you can only leave C2, or only C2 / C3 so as to have 1pF or 0.5pF respectively. Yes the bottom sideb is connected to ground, it is a screen to reduce the possibility of self-oscillation.

Thank you so much Mr. Franco
But I think you did not understand me
I built two type of your circuit.
The quartz circuit works well But the non-quartz circuit (your first circuit, which 6 bars) does not output.
Transistors 1, 2 and 3 have voltages, but transistor 4 does not have voltage.
for oscillation(parasitic coupling) Do i connect bottom strips to ground ?
Thanks for your reply

[FrancoItaly]

Thank you so much Mr. Franco
But I think you did not understand me
I built two type of your circuit.
The quartz circuit works well But the non-quartz circuit (your first circuit, which 6 bars) does not output.
Transistors 1, 2 and 3 have voltages, but transistor 4 does not have voltage.
for oscillation(parasitic coupling) Do i connect bottom strips to ground ?
Thanks for your reply

In my first lrl (self oscillating) the lower strips are not needed, in fact the lower screen is used to prevent self-oscillations. I advise against using this version, I made the version with oscillator just to make the lrl less critical to build. One way to trigger the self oscillation is to use a lower strip to connect the collector of TR2 with the base of TR1 or between the collector of TR3 with the base of TR2 via an appropriate (small value) capacitor. In this way two points out of phase of 360 degrees are connected. The only possible advantage of this version is that with it you are sure to have obtained the maximum amplification. As I said in the past this lrl derives from a bug detector that auto oscillated providing a stable signal capable of revealing the "phenomenon".