Lrl from Italy

[Rubin]

Thank you very much

[liudengyuand]

Most people have overlooked an important point and are busy with how to make it, but they don’t want to make it useful or not. This is the point. What metal it can explore, how far it can explore, and how deep it can be, all of which require data to speak. ,

[folharin]

where are you, morgan?to answer?

[gwlwudi]

Originally Posted by liudengyuand

Most people have overlooked an important point and are busy with how to make it, but they don’t want to make it useful or not. This is the point. What metal it can explore, how far it can explore, and how deep it can be, all of which require data to speak. ,

Your ignorance cannot mean non-existence

[brs]

Originally Posted by liudengyuand

Let me tell you the truth, this circuit is made of double-sided copper clad laminate, and the output is only a little bit. When made of single-sided copper clad laminate, the output is more than two volts. It does not matter how much the output is. As long as it can be compared in the end, there is no adjustment for l1 and c10. Meaning, within the range of 100pf, or even greater, its sensitivity has not changed much. It can react to the sky or some ground, but this is only a problem of geographic magnetic field and has nothing to do with metal. Don?t say you succeeded. In fact, no one has ever seen you, nor can you know that you succeeded or failed. You always like to hear others say that you succeeded, and you hate others to say no. This is your psychological problem. You found water at a depth of 60 meters in your country. The basic knowledge tells you that as long as it is not a mountain, there is basically water in the ground 60 meters deep. You attribute this function to the oc

He gave Franco everything he had. Thanks Franco. As for you, you just have to criticize others.

[zakari]

hi franco

thank you so much for sharing this circuit

i made several time your lrl that is work perfect

best regard

zakari

[zakari]

hi
i used china digital fm transmitter module and injecte weak signal from transmitter to base of tr2 ,i have removed xtal and tr1 i have nulled transmitter and reciever antenna's
that is working good
now i can change the transmitter frequence and tune in my area for best operation
best regard

zakari

[FrancoItaly]

Originally Posted by zakari

hi
i used china digital fm transmitter module and injecte weak signal from transmitter to base of tr2 ,i have removed xtal and tr1 i have nulled transmitter and reciever antenna's
that is working good
now i can change the transmitter frequence and tune in my area for best operation
best regard

zakari

What you did is very interesting, did you keep L1 / C10? If so, have you tuned the transmitter frequency with L1 / C10? I too am experimenting with an FM oscillator that I made, my problem is that the signal is always too strong and saturates the sensor stage, I have tried unsuccessfully to shield the oscillator and further decouple the oscillator power supply.

[zakari]

Originally Posted by FrancoItaly

What you did is very interesting, did you keep L1 / C10? If so, have you tuned the transmitter frequency with L1 / C10? I too am experimenting with an FM oscillator that I made, my problem is that the signal is always too strong and saturates the sensor stage, I have tried unsuccessfully to shield the oscillator and further decouple the oscillator power supply.

hi franco

you are right i have made some handmade fm transmitter circuit but saturates the sensor intrance signal and unstable the transmitter frequency
i use below pll fm t module adjusted distance transmitter and receiver circuit to avoid the saturation signal
i transfer pp key of module on the box to adjust the frequency of transmitter



best regard
zakari

[FrancoItaly]

Originally Posted by zakari

hi franco

you are right i have made some handmade fm transmitter circuit but saturates the sensor intrance signal and unstable the transmitter frequency
i use below pll fm t module adjusted distance transmitter and receiver circuit to avoid the saturation signal
i transfer pp key of module on the box to adjust the frequency of transmitter



best regard
zakari

Thank you for the information, I also invite other members to experiment. The fact that two equal frequencies arrive at the mixer (TR2 base) makes it much more sensitive. With the 20Mhz oscillator my idea was just this, that is to tune L1C / 10 on a harmonic of the oscillator. But even in this case the signal is too strong and unstable.

[zakari]

Originally Posted by FrancoItaly

Thank you for the information, I also invite other members to experiment. The fact that two equal frequencies arrive at the mixer (TR2 base) makes it much more sensitive. With the 20Mhz oscillator my idea was just this, that is to tune L1C / 10 on a harmonic of the oscillator. But even in this case the signal is too strong and unstable.

hi
i use one 10pf cap an one 5k pot in input transmitter signal to base of tr2 to adjust mixing rate of two signals an adjust sensor out put voltage
i believe the most important problem of this device is self oscillation . in my country the circuit self oscillation is variable during the day and night
for example if one body adjust the out put voltage zero at 21 oclock the device work good that this time and no working perfect at another time
there fore i put the one 5k double volume instead of r10 an r12 to adjust the self oscillation. last year i have explained in this forum
dose any body has the information about the gold filter in below schematic??



best regard
zakari

[FrancoItaly]

Originally Posted by zakari

hi
i use one 10pf cap an one 5k pot in input transmitter signal to base of tr2 to adjust mixing rate of to signals an adjust sensor out put voltage


best regard
zakari

Fine thanks.

[brain]

hi everyone i found this while browsing a forum site i tried it but i don't have a test area .. its sensitivity is nice.

https://ibb.co/GHWYtcF

[Pahom]

Originally Posted by brain

hi everyone i found this while browsing a forum site i tried it but i don't have a test area .. its sensitivity is nice.

https://ibb.co/GHWYtcF

What types of radiation is this circuit sensitive to? And that at the input there is a quartz resonator, or an oscillator with a frequency of 8 MHz

[liudengyuand]

good good

[liudengyuand]

I successfully detected a copper coin with a diameter of 2 cm, buried for 6 years, at a distance of 4 meters, and a depth of 30 cm, but the output of lm358 is unstable. As time increases, the machine always automatically alarms to prove the sensor The output voltage is rising automatically, so I have to adjust the critical point of 358 frequently.

[tasmen]

Originally Posted by liudengyuand

I successfully detected a copper coin with a diameter of 2 cm, buried for 6 years, at a distance of 4 meters, and a depth of 30 cm, but the output of lm358 is unstable. As time increases, the machine always automatically alarms to prove the sensor The output voltage is rising automatically, so I have to adjust the critical point of 358 frequently.

https://www.longrangelocators.com/fo...postcount=2558

[brain]

Originally Posted by liudengyuand

I successfully detected a copper coin with a diameter of 2 cm, buried for 6 years, at a distance of 4 meters, and a depth of 30 cm, but the output of lm358 is unstable. As time increases, the machine always automatically alarms to prove the sensor The output voltage is rising automatically, so I have to adjust the critical point of 358 frequently.

Did you find it with the circuit diagram I sent?

[ERDOGAN37]

hello,
can you give information about the coil value?
best regards...

[FrancoItaly]

This is not my lrl, you better open a new thread so as not to get confused.

[ERDOGAN37]

Can you share a gold lrl project that you are 100% sure of.

[FrancoItaly]

Originally Posted by ERDOGAN37

Can you share a gold lrl project that you are 100% sure of.

I don't know of lrls that only work for gold.

[FrancoItaly]

I am working on the 100 Mhz version and I do not use a module but a transistor oscillator with frequency command with varicap diode, I do not use a coil printed on the pcb, but a flat coil placed horizontally, while on the sensor stage an equal coil but placed vertically , with the aim of minimizing the transmission of the signal from the oscillator to the sensor stage. In this way, a good result is obtained by keeping the oscillator about 7 cm from the sensor stage. As soon as I have finished drawing the scheme I will post it.

[liudengyuand]

At least you need to know the inductance value of L1 to roughly determine the resonance frequency with c10. This requires a high-precision inductance meter.

[FrancoItaly]

Originally Posted by liudengyuand

At least you need to know the inductance value of L1 to roughly determine the resonance frequency with c10. This requires a high-precision inductance meter.

There is a simpler system, just build the two coils, oscillator and sensor stage, the same and check the output of the sensor stage (DC voltage). When the maximum value is obtained, it means that L1 / C10 is in resonance with the oscillator.