Lrl from Italy

[dream_man]

Hello Dear Franco ;
First of all thanks for publishing your LRL and answering our questions from simple to critical.
I'v not seen the rout of the selected items in your schematic, so I connected them as the below picture shows. I proposed the rout, please check whether is correct or not. In case of mistake, please recommend me how to do. thank you.

[pigeon]

pcb

hi all

please anyone have the pcb for this version

thank you

[dream_man]

Hello Dear Franco ;
First of all thanks for publishing your LRL and answering our questions from simple to critical.
I'v not seen the rout of the selected items in your schematic, so I connected them as the below picture shows. I proposed the rout, please check whether is correct or not. In case of mistake, please recommend me how to do.

1. In display stage, pin 1 of P2 is connected to R2 and the middle pin is connected to out of IC1A, but how about Pin 3 of P3?

2. Are connected R3,R4,R5, and R6 together? or they are connected to the inverting input (-) of IC2A, IC2B, and IC1B ?

3. I've downloaded your CompPcb.pdf of sensor stage, please upload the display stage as well if possible.

[FrancoItaly]

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

2. the inverting input (-) of IC2A, IC2B, IC1B and the output of IC1A are connected together.
R3/R4 to pin + IC2B --- R4/R5 to pin + IC2A -- R5/R6 to pin + IC1B.

3. I have PCB only of the sensor stage, the only that's critical. I think there is no problem for other PCBs.

Best Regards

[dream_man]

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

2. the inverting input (-) of IC2A, IC2B, IC1B and the output of IC1A are connected together.
R3/R4 to pin + IC2B --- R4/R5 to pin + IC2A -- R5/R6 to pin + IC1B.

3. I have PCB only of the sensor stage, the only that's critical. I think there is no problem for other PCBs.

Best Regards

Thanks dear Franco for your supportive and productive information.

[dream_man]

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]

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]

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]

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?????