Lrl from Italy

[FrancoItaly]

I don't know, I have no experience. I suppose that in an airtight container is difficult that the phenomenon has origin.

[du6r]

I think that the stage is self oscillating, try to decrease C13 and C14 to original value (560pF). If in open air you have 4-6V (DC output) and if you touch the antenna the signal decreases, then the lrl is ok.

thank you i will try

regard

[Mike(Mont)]

I had trouble uploading also. Never did get it. I figure too many pixels. Does anyone know the size limit? My camera has a size setting.

[zakari]

hi all
thank you mr franco

i sure frnco's lrl work very well i revealed the copper from 9 meters distance and 60 cm depth

but i have some problems

1-the 3leds display isnt suitable maybe vu meter is better

2- reaction of my device is low when i sense a point and go far the leds not turn off

3- point pointer for me is impossible when i stand above target the led not turn off

i apply digital volt meter panel with 0.01 accuracy and connect to pin 1 of ic1a

sir franco

please put here vu meter schematic with high accuracy

can you explain about point pointer beacase i cant see the you tube videoes

[FrancoItaly]

Hi zakari,

I don't have a Vu meter schematic but you can simply connect at the output of the first operational amplifier (IC1A), instead of the comparators. However I do not consider it necessary to use a Vu meter. As it regards the slowness in the response of the LEDs, perhaps you have put too great a value for C1 (22nF), and decrease the value of C17 and C18 in the sensor Stage, from 100nF to 3300 pF.

Best Regards

[abdou2014]

Franco VU Meter 10 LEDS

[liudengyuand]

Have more friends experiment a success?

[mokkethon80]

yes.me to cant work lool succes.nobody cant help this projek complete..in my land evebody need fin the tresure the gold from ww2 japanese take the gold in the mautain seve in the hole but nobody cant fin ths gold. thats way we need this projek..but is not working😭😭

[FrancoItaly]

Hi all,

I have designed new power stage, more simple with 2 transistors instead of 1 IC. New DC amp with 1 led with variable gain and the possibility of later add 3 leds display. The latter stage is formed by transistors and not by operational amplifiers and it's more versatile since it allows to add other LEDs without modifying those already present.
Since I am not in Italy, and so I do not have my lab, I only simulated the circuits but I have not made. However they are very simple and there should be no problems.

Best Regards

[FrancoItaly]

Here di other files

[mokkethon80]

where..the new projek

[zakari]

HI FRANCOITALY

thank you so much for your new power and display stage

best regards

[darkman]

hi franco bro

thx's for Additions ;

* what is the point of using c2(100nf) between pin4(the Ground) and pin8(the power) of ic1 in DC Amp. stage ?
so we got now 4 leds instead of 3 leds ?

*why you using D1,D2 and D3 instead of A less value of ZD2 in 3 leds display stage ?


regards **

[FrancoItaly]

C2 avoids self oscillations of IC.
I use D1, D2 and D3 only because I think it's more difficult to find low values for the zener diode.

[darkman]

C2 avoids self oscillations of IC.
I use D1, D2 and D3 only because I think it's more difficult to find low values for the zener diode.

thx bro