Lrl from Italy

[dream_man]

Originally Posted by FrancoItaly

1. Pin 3 of P2 is not connected, P2 is used as variable resistance.

Best Regards

sorry Franco, how about the middle pin of P2? is it connected to the out of IC1A ?

[brs]

hi Mr. Franco
to increase the gain in the 8mhz device only increase the value of C13 and C14

[brs]

The device works I have a test field reveals a 3-meter 2 silver ring and some copper small cutting depth of 40 cm and I want beyond that disclosure Is there a way to increase earnings

[FrancoItaly]

Hi dream man,

Yes, the middle pin of P2 is connected to the out of IC1A.

Best Regards

[dream_man]

Originally Posted by FrancoItaly

Hi dream man,

Yes, the middle pin of P2 is connected to the out of IC1A.

Best Regards

Thank you dear Franco, I'm drawing a new schematic of your LRL and will upload it in the upcoming hours

[FrancoItaly]

Hi bsr,
Yes you may increase the value of C13 and C14 or you may decrease the value of R10 and R12 but the output of sensor stage must be lower than 6V. For increase the sensibility you must increase the gain of the first operational of display stage, the important thing is that it does not appear the compass/sky effect. Another thing you can try is to vary L1 / C10, for L1 test 2 turns and for C10 test 10-22-33pF and see if it changes the sensitivity for silver and copper.

Best Regards

[dream_man]

Hello Mr. Franco;
May you check this PDF schematic file of your LRL whether is correct or not, and please share your recommendations?
Thank you.

[FrancoItaly]

it seems right, but I suggest adding the "low battery" circuit which is the version with 1 LED.

[dream_man]

Originally Posted by FrancoItaly

it seems right, but I suggest adding the "low battery" circuit which is the version with 1 LED.

Thank you dear Franco. I actually got the battery circuit from your 1LED circuit.
18Volt battery is connected to C20=100 Micro 25volt,--->100N---->L7812 Voltage reg--->C22=100 Micro 25v--->100N---> to circuit.
may you help more?.. whats the difference? ... I already drawn the 3 led version... "low battery" circuit, what does it do?

[mustefa ubram]

Originally Posted by mustefa ubram

thank you franco
Do you think deep failing system?
10 silver coins placed on how deep it is appropriate to test?
And for how long?

Franco?????

[FrancoItaly]

in my experience 5 silver coins buried about 25cm for at least a month, but I think it is also important the type of soil.

[Napsterce]

Hello friends, i have built the sensor stage and on the output it gives a voltage under 1 volt and when i touch the antenna it decreases for about 0.10volts. And it is not stable, at connecting to the 12v source it gives 0.36v and when i touch the antenna it goes to 0.26v, after a 2-3 minutes it goes to 0.56v and when i touch the antenna it goes to 0.40v. Is that ok or not? Thank you all.

[pigeon]

hi all

someone had the pcb

thank you

[Napsterce]

After resoldering the L1 the starting voltage on the output is 1.36v and it keeps increasing, after 5 minutes it went up to 2.86v. When i touch the antenna it decreases the output for 0.10-0.15v. Is this ok or is there some problem? Franco? I checked all the soldering joints.

[dream_man]

Hello dear Franco. Sorry, how much is the VCC of IC in "low battery indication"?,,, 12V or 18V?

[FrancoItaly]

VCC of IC in "low battery indication" it's 12V. I suggest you adjust P1 so that "low battery" is on when the battery voltage drops below 16V.

[dream_man]

Originally Posted by FrancoItaly

VCC of IC in "low battery indication" it's 12V. I suggest you adjust P1 so that "low battery" is on when the battery voltage drops below 16V.

thank you dear Franco

[Napsterce]

Dear Franco, i have built the lrl, but the leds glow all the time and when i touch the antenna one of them turns off. When I adjust the gain and threshold to more sensitive and less gain only the red led glows and when i touch the antenna it turns off. Is this correct or it should be the other way, when i touch the antenna the led to start to glow? Everything is built by your schematics, the display stage is with 3 led diodes with lm358p.

[brs]

dear franco
Thank you to everyone help you perfect man Franco

[dream_man]

Thank you dear Franco for supporting us.
Here I attach both "8MHz - Quartz LRL Power + Display (3 Led)" and "8MHz - Quartz LRL Sensor Stage + Power Stage with Low Battery Indicator + Display Stage (3 LEDs)".
Hope it helps other friends to make their PCBs.

[pigeon]

Originally Posted by dream_man

Thank you dear Franco for supporting us.
Here I attach both "8MHz - Quartz LRL Power + Display (3 Led)" and "8MHz - Quartz LRL Sensor Stage + Power Stage with Low Battery Indicator + Display Stage (3 LEDs)".
Hope it helps other friends to make their PCBs.

MR DREAM MAN

have you the pcb please.

thank you

[dream_man]

Originally Posted by pigeon

MR DREAM MAN

have you the pcb please.

thank you

Hello friend;
I've not made any pcb yet. sorry for that.

[pigeon]

Originally Posted by dream_man

Hello friend;
I've not made any pcb yet. sorry for that.

ok thank you

[Napsterce]

Originally Posted by Napsterce

Dear Franco, i have built the lrl, but the leds glow all the time and when i touch the antenna one of them turns off. When I adjust the gain and threshold to more sensitive and less gain only the red led glows and when i touch the antenna it turns off. Is this correct or it should be the other way, when i touch the antenna the led to start to glow? Everything is built by your schematics, the display stage is with 3 led diodes with lm358p.

Franco?

[FrancoItaly]

" only the red led glows and when i touch the antenna it turns off " this is correct.

Best Regards