Can pinpointer detecting thin chain?

[paku]

this detector is like gerret THD hehehe

[aliaf]

Hello Davis9000.
What are the parameters of your coil?
1. The diameter and length of the ferrite cores.
2. The number of turns and wire diameter of the inductance L1, resistance.
3. The number of turns and wire diameter of the inductance L2, resistance.
4. The total inductance L1 + L2.

[aliaf]

Nupi hello.
Here is a photo and video tschgo yato I did.
DSCF2702.JPG
DSCF2703.JPG
DSCF2704.JPG
Новый.mov

[Davis9000]

Hello! Thanks Nupi for this pinpointer project. Finally I made it and it works. For coins the maximum that I can get is something about 5 cm and for larger objects it is little more.

[Nupi]

Hi aliaf,

Strange things happen with nupi pinpointer.

Murphy's law, gains its power in recent days. "Anything that can go wrong, will go wrong"

Can you make a clear picture of your circuit and post here?
Maybe I can evaluate it better.

regards nupi

[aliaf]

Hello Nupi.
Put a resistor in series R2 100k. No changes.
Tried to put R2 220 k, 150k, as well as R220k and subsequently another trimmer 100k. no change. scheme works in the opposite direction.
Replaced R1 1k on 4,7k became stable adjustment and slightly increased sensitivity. but still works in reverse.
New coil wound counterclockwise unchanged. Probably and ostailyu. Do not know what else to do.
Sensitivity is not bad - a coin with a diameter of 23 mm - 8 cm.

[Nupi]

Oh!! you meant, Naughty Boy.

Maybe you have a little bit right. .

[paku]

I think so.
What is Noty Boy?

watch this if you want to know, what is noty boy hahahah

https://www.youtube.com/watch?v=O23xIvuQtnM

[Nupi]

Thanks Fabian, I could not have better explain.

Aliaf: I think your coil OK.
If the PP works the other way comes through the adjustment from R2. As Fabian says put between R1 and R2 a resistance of 100k and adjust R2 again.

regards nupi.

[Fabian]

Hi Aliaf. Control the connection of the coil (connection 1 and 2 can't be swapped). Try to put a 100k resistor in series with R1 and try; On the other hand, the 33nf capacitor for the coil MUST BE MKP. Thats worked for me.

See this post:

http://www.geotech1.com/forums/showthread.php?21373-Can-pinpointer-detecting-thin-chain&p=191176#post191176

Regards,

Fabián

[aliaf]

Hello Nupi.
Pinpointer assembled on the breadboard.
Tried to make a couple of ferrite coils on three parts. Since ferrite F10mm I did not have one coil made of rectangles 10h12h 40mm and the second round at f11 and a length of 40 mm. When fitting the inductance according to the scheme the number of turns in both windings and decreased resistance of the windings was larger 3.5 ohms and 2 ohms.
With these coils do not work scheme.
Then I realized. that this diameter ferrite wound 155 turns of wire f 0.28 mm and resistance of 1.6 ohms. it is simply impossible. Pigtail 1.6 ohm and 0.29 mm in diameter was 5.2 meters.
Do some calculations I measured a piece of wire f 0,29mm and resistance 1.6 ohms and ferrite f13mm wound two layers, respectively, 71 and then 74 turns. If the resistance of 1.6 ohms Inductance sotavila 1,6mH.
The second winding 72 turns of wire f 0.42 mm with 0.6 ohms resistance inductance was 0,6uH. The total inductance was 3,3mH.
Put voltage marked on the chart in blue resistor R2 when the coil is off.
Apply power pinpointer once earned, but in the opposite direction - LED light and buzzer beeped. When approaching the metal buzzer changes tone and zomolkaet and the LED goes out.
Resistor R1 tuned chuvstvitelrost
Coin sees at a distance of 8 - 9 cm. To fine-tune better use of multi-turn R1.


Why it works the other way round?
Conclusions windings are interchanged never worked.
Perhaps you need a new coil wound with the opposite direction of turns?

[Nupi]

I think so.
What is Noty Boy?

[paku]

this is you final Schematic pinpointer Noty Boy ?

http://www.geotech1.com/forums/attachment.php?attachmentid=30692&d=1405848258

[Nupi]

Hi paku,

That's a good question!!!
I think # 426.
But I'm not sure.

regards nupi.

[paku]

hahah yea same like me my english is bad to
where is the working schematic Nupi pinpointer