VLF MD (by Sascho - Varna)

[dfbowers]

Worthwhile project?

Hello,

Has anyone out there built this project? I have seen it posted here and elsewhere and it looks like it may be an easy project for the amature (like myself). Other than having to translate Russian it looks like someone did a good job with making the schematic easy to read.

http://www.md4u.ru/forum/viewtopic.php?t=1312

Thanks.
Don

[aft_72005]

Nice work AFT.

hobbes_lives
Thanks for your assessment .
Best regards

[hobbes_lives]

Nice work AFT.

Search coil can be easily compensated in phase and amplitude.
like schematic http://www.geotech1.com/forums/showthread.php?t=13087
Metal detector with meter discriminating
c4,r50,p1-phase
c5,r3=47k,p2-amplitud
A little more plate; p1 and p2-trimmer.
Achieves the minimum signal.

[aft_72005]

Yes,this schematic is very nice and well working.I was made a little mistake with audio part -transistors and there was less sensitivity,but now everything is OK .Detector is very sensitive and easy to adjust ..

Hi Pompey
I don’t have free time for testing circuit now ,
And believed what’s Sascho said about this circuit , I am interest
Know your test result .
Are you test it on the ground?
And deep on the ground?
Please more explain about air test with 1 euro coin ?
Is discrimination good ?
Is ground balance work true?
Best regards.

[Pompey]

Yes,this schematic is very nice and well working.I was made a little mistake with audio part -transistors and there was less sensitivity,but now everything is OK .Detector is very sensitive and easy to adjust ..

Excelent work Aft....
Dont listen to the turkish!
I made it work more than good.Wasnt able to made proper coil then.
But wit average test coil showed very good behaviour.
So if you tune it right you will see for yurself.
Can you share those changes you made to the PCB?

keep on ................................................. detecting

Сашо,при върнат докрай трешолд трябва ли да се чува тих фонов звук в слушалките?

[aft_72005]

Hi to all
Although Turkish guys at Turkish website said that this circuit without success
And didn’t work truly.
But I believe Sascho and decided try it again by myself.
Thus built PCB of the "best vlf detector" and montage it. I apply some alter
To Leto PCB . omitted two big wire jump and other changes.
Not test it yet. I am saying more afterwards.
Best regards.

[humhum]

Hello

http://yakimov.homeftp.net/banditko/METAL%20DETECTORS/IB/

some schematics including Varna VLF

Best Wishes
Erol

EROL bey, your link is death.

Niakoi testva li shemata na poleto?Kak hvashta 1lv v zemqta?

Did someone test this schematic in the field?How deep it detects 1 euro?

Niakoi testva li shemata na poleto?Kak hvashta 1lv v zemqta?

golegi

ai stiga

[aft_72005]

Hi Leto
Please say me about your final test with this detector ?
How many deep in air for 2 centimeter coin ?
Is it stable working?
Best regards .

[sonar]

I have some free time and I analyze that - its some pics from me:




maybe its usefull for someone