Lrl from Italy

[Napsterce]

Dear Franco, can i use wooden box made from thick (3mm) wood or it is better to be in plastic box?

[FrancoItaly]

L1/C10 is pass band filter, if you remove L1/C10 or change values (more than 3 turns or less than 2 turns) the lrl don't work. The 8Mhz signal is somehow modulated by the "phenomenon" and this may vary from 3 to 10 Mhz. I can even add that frequencies of about 60 kHz do not work.
Much as regards the box, I always use plastic (easier for me to work) but I would think the wood is suitable, since there is not involved static electricity.

Best Regards

[brs]

dear franco
If we put instead of 8 mhz 9 or 10 mhz Are performance differs

[afshin]

Originally Posted by FrancoItaly

L1/C10 is pass band filter, if you remove L1/C10 or change values (more than 3 turns or less than 2 turns) the lrl don't work. The 8Mhz signal is somehow modulated by the "phenomenon" and this may vary from 3 to 10 Mhz. I can even add that frequencies of about 60 kHz do not work.
Much as regards the box, I always use plastic (easier for me to work) but I would think the wood is suitable, since there is not involved static electricity.

Best Regards

Hi dear Franco,Thank you,
But It seems to be a band stop filter,Because the LC resonance waves received by the antenna go to the circuit ground with a minimum Impedance by LC, instead of
go to the base of Tr2 for mixing
and modulation with the 8 Mhz
,and it is strange. actually All frequencies pass and go to mixing and modulation except the LC frequency!!
while it should be inverse.
actually if this is a pass band filter has to be this form,I drew
What is your opinion dear franco?
Best regards

[mustefa ubram]

Originally Posted by afshin

Hi dear Franco,Thank you,
But It seems to be a band stop filter,Because the LC resonance waves received by the antenna go to the circuit ground with a minimum Impedance by LC, instead of
go to the base of Tr2 for mixing
and modulation with the 8 Mhz
,and it is strange. actually All frequencies pass and go to mixing and modulation except the LC frequency!!
while it should be inverse.
actually if this is a pass band filter has to be this form,I drew
What is your opinion dear franco?
Best regards

hi freind
You are misunderstanding the concept of filter.When used electronics components that are full use.You painted the wrong input and output filter.In the picture You drew of capacitance and inductance are virtually out of the circuit Only have a connected base with circuit Not applicable in the circuit.

https://en.wikipedia.org/wiki/Low-pass_filter

[mustefa ubram]

hi franco
I have about 2.5 volts in standby mode the sensor output.And about 6 volts when the full reaction.
Is the low 2.5 volts?
In this case a very high sensitivity to the waves

[FrancoItaly]

Hi afshin,

L/C pass band filter at the resonance frequency it has a very high impedance and being placed between the antenna and ground leaves pass without attenuation only the resonant frequency signals, while it is almost a short circuit for the other frequencies.

Best Regards

[FrancoItaly]

Hi mustefa,

the output voltage is ok in 1-6V range, but I recommend about 5V because this way ensures that the sensor stage has the maximum gain possible without distortion, however also 1V can be compensated with a higher amplification in the display stage. The output voltage depends on two factors, one it's the sensor stage gain and the other is the amount of 8Mhz signal that goes to base of TR2. This is why I recommend to remove (or rather not sold immediately) quartz and find the right values for maximum gain without self-oscillation. Only after we can determine the values for C2 / C3 / C4.

Best Regards

[abdou2014]

Mr Franco you say that 3 turns running well in your region italy and switzerland ,What you recommended for the southern countries , to add a turn or remove a turn ? Thank you !

[FrancoItaly]

For my experience 2 or 3 turns work well, 1 or 4 turns do not work. For other country I don't know, but I think it's the same thing, you just have to try.

[brs]

dear franco
If we put instead of 8 mhz 9 or 10 mhz Are performance differs
Reply

[afshin]

Thank you dear franco and mustefa

[FrancoItaly]

Hi brs,

The gain of the sensor stage also depends on C13 / C14 and then increasing the frequency (from 8 to 10Mhz) also slightly increases the gain. However during calibration we determine the appropriate value for C13 / C14 for maximum amplification can be useful for that frequency. Changing the quartz (and therefore the frequency) after the calibration certainly increases a little the gain. The situation is different if you've noticed a different sensitivity to a given metal.

Best Regards

[brs]

Thank you dear franco

[pigeon]

Originally Posted by dream_man

Here I attached a new PCB of the 8MHz - Quartz LRL Sensor Stage + Power Stage with Low Battery Indicator + Display Stage (3 LEDs), and its schematic. Hope it helps you my friends.

hi dream man


can you give me the part +/- battery?.


I have to make a switch?

thank you very much

[pigeon]

Originally Posted by pigeon

hi dream man


can you give me the part +/- battery?.


I have to make a switch?

thank you very much

help me please

[Napsterce]

Here it is my friend.

[pigeon]

Originally Posted by Napsterce

Here it is my friend.

thank you

[pigeon]

hi all friends


i have built dream man pcb I use a bc190c place bc183c is that they have the same location.

i have not electricity in the pcb no power

help me soory for the little english

thank you

[Napsterce]

Pigeon have you fixed the problem? What pcb have you made?

Franco tell me your opinion about MFD, do you think that your lrl in combination with MFD transmitter will give better results? If I'm not wrong your lrl catches the phenomenom and the MFD transmitter should amplify the phenomenom (actually it amplifies the metal's frequency which i think is very close to the phenomenom). Also i want to mention that by my last tests the lrl catches the frequencies emitted by radio/tv antenna and phone (gsm/hspa/lte) antenna but it doesn't catch frequencies emitted by police walkie talkie antennas (i don't know at which frequencies any of this antennas work).
Best regards.

[FrancoItaly]

I don't think that MFD may help with lrl because the frequencies are very different but I have not done any testing, maybe a harmonic of the MFD can happen in the range of LRL.

[Napsterce]

Dear Franco, MFD frequencies for gold as listed on forums an on MFD manuals are 5khz for gold and 8.7khz for silver. I think that in earlier posts you said that your lrl works around this frequencies. Thank you.

[FrancoItaly]

My lrl basically is a receiver tuned about 100 - 150 Mhz which detects anomalies in this range, then very far from 5 -7 Khz.

[FrancoItaly]

Several years ago I made tests with MCD and dowser and found that this system is too influenced by the human mind and therefore unreliable, at least in my case.

[Napsterce]

Yes that is coreect but i will try to use the MFD transmitter with your lrl. Like i said, i hope that it will amplify the phenomenom field so it would be easier to be catched by your lrl. The MFD you have built was with powered L rods? By what schematic you have built the MFD? Thank you.