Lrl from Italy

[taxma1981]

This lrl work fine,
https://youtu.be/l3nH9CG0lI8

[WM6]

Evidently.
It can detect U-boot at 1 cm distance.

[taxma1981]

I have marks and outside in nature

[Geo]

Originally Posted by taxma1981

This lrl work fine,
https://youtu.be/l3nH9CG0lI8

my VLF (made in china) also makes the same

[taxma1981]

This is the lrl franko with 4046 not mein

[Geo]

Hi Franco.
What is happening when your lrl catch the phenomenon (or locates the buried coins)?
1. At xtal version, at emmiter of tr5 and
2. At pll version , at pin2 of 4046
Voltage increase or decrease??

Regards

[FrancoItaly]

Hi Geo,
With xtal version voltage increases at emitter of Tr5 with the phenomenon, with pll version the voltage decreases at pin 2.

Best Regards

[Geo]

Originally Posted by FrancoItaly

Hi Geo,
With xtal version voltage increases at emitter of Tr5 with the phenomenon, with pll version the voltage decreases at pin 2.

Best Regards

Thank you Franco

[RIMES]

thanks

[Bill512]

Originally Posted by FrancoItaly

Hi Geo,
With xtal version voltage increases at emitter of Tr5 with the phenomenon, with pll version the voltage decreases at pin 2.

Best Regards

Franco, in my PLL the voltage increases.
More specifically, the voltage measurements at pin 2 was not reliable ,because the interference from the probes was enormous.
So instead of pin 2 , the voltage at the R4-C5 node and also at R5-C6 node was measured.
For example, from an initial voltage of 3V this voltage goes to 3.5 or even to 4.5V in case of strong "signals".
I don't consider this as a problem, is just info.

[FrancoItaly]

Hi Bill512
It's possible that the voltage increases, this depends on the phase of the amplified signal compared to that of the VCO 4046, the critical point is in the TR1 stage that's drived by a pulse signal. Probably C3, TR1 and P2 can be eliminated and you can connect directly C8 and pin 4.
Best Regards

[Geo]

I reinstated the audio at normal position (it was reverse) and fixed the case.
Now Franco's lrl is ready for T.H......

[WM6]

Nice! Look like indestructible design.

Geo you should put on it "Made in EU" "Manufactured in Greece".

[Geo]

No, i don't like "EU".
I am sure that you understand why????

[WM6]

Originally Posted by Geo

No, i don't like "EU".
I am sure that you understand why????

So I provoke you.

What material you use for housing, FR4 (Cu plated vitroplast) or it is wood in whole?

[taxma1981]

Lrl franko

[Geo]

Originally Posted by WM6

So I provoke you.

What material you use for housing, FR4 (Cu plated vitroplast) or it is wood in whole?

Wood with foil......

[pigeon]

Originally Posted by Geo

Wood with foil......

hi all friends

anyone have o complet projet.

thank you

[WM6]

Dear friend

695 posts in this thread (including this one).

A couple of finished Franco's devices and you are still asking for "complet projet"?

Maybe you need to read this thread from start.

[Geo]

Originally Posted by pigeon

hi all friends

anyone have o complet projet.

thank you

The project is a little critical. I sujest you to read carefully all the posts so to understand it and to give carefull at some points. Best version (most easy) is the 8Mhz xtal
Good luck

[WM6]

Good work walkman. Congratulations.

[pigeon]

Originally Posted by walkman

just like this : D

hi walkman

you have the pcb

thanks. you are a good man

[brs]

7805 ؟
or 7812

[FrancoItaly]

Hi walkman,
very good work, the IC is 7812 as all the lrl functions at 12V.
Regards

[WM6]

Originally Posted by FrancoItaly

Hi walkman,
very good work, the IC is 7812 as all the lrl functions at 12V.
Regards

In this case power supply should not be 12V as marked on PCB, but something near to 15V.