Can pinpointer detecting thin chain?

[ripsdevala]

Nupi's pinpointer in homemade water proof enclosure.

https://youtu.be/nB_lOlpI7Vk

Are u using layout from nupi author? I was working on this before, but not working.
Let me try chemelec layout, anyone have the sprint?

[blobber]

Here are my files, as you can see with some modifications. The ferrite rod is 8 mm diameter and 60 mm long. Power supply with LM317.

Nupis PP_mod blobber.zip

[ripsdevala]

Many thanks

[Funfinder]

Some news from the real metal-detecting world!
btw. a thin chain is huge compared to this here:



which I found with the Makro Racer with 28cm coil plus modified Garrett Pro Pointer.
Its a record - the smallest handmade nails I have ever found so far!
Besides: Everything detected by vibration - size ca. 7mm.

Without modified pinpointer - no chance!
I had spread just a little bit of the soil super flat over my hand and
it took me over 30 seconds to find out with the PP where the metallic thing is hidden.

[viwaldi]

Hello
Has anyone built an automatic nupi? I'm going to build a pinpointer and wonder which version to choose.

regards
viwaldi

--
translated from Polish by Google translator

[viwaldi]

@NUPI

Hello NUPI
Have you thought over the coil on the core of the filter? Such as the picture.
Robilem pinpointer minimax2 with such a coil. The lines were very similar to the dedicated coil.



https://youtu.be/1-01C7XvOn0


regards
viwaldi

--
translated from Polish by Google translator

[Virdi_248]

I have managed to make it work. Replaced adjustable resistance of 1k for 100k and also I have changed cd4024 for the new one and now it works. The worse thing is the big size, in the future I am going to make other one small.


[ATTACH]39934[/ATTACH]
[ATTACH]39935[/ATTACH]

https://www.youtube.com/watch?v=OO_Dyu_5lew
Thank you

I have fulfilled another small pinpointer mas with my pcb sprint layout. I have proved it in rich land in very bad salt for detectors.

The result has been excellent, alone two times the pinpointer fits in four hours.

With the permission of the creator of the thread I put my pcb, the information of my own bobbin and some photo and video. In the video the pinpointer not this one in his maxim sensibility. I sit it for translation of the language.


Chip used
HCF4024

Thanks to all who helped me.
pp nupi pcb sprint layout.rar
Data coil.txt






https://www.youtube.com/watch?v=46Fiqvx5uEQ

[viwaldi]

My nupi finally works I could not find a mistake for a long time. The contact board power supply was defective. The power supply voltage was very unstable. On the new power supply the nupi started working immediately. Coil on ferrite from the filter. Wire anyhow. Inductance L1 1.65mH and L2 did not even measure.
The coin is 1 Polish penny (15.3 mm brass).
If the coin is at the same coil - the nupi lose their voice. It looks like the signal was too big. So it has to be? Do you try to regulate?

https://youtu.be/FkTlnD6m8Oc

[Funfinder]

You can regulate it by yourself with a 90° bend over screw near the coil for maximum sensitivity.
This works out in the field much better and faster as adjusting some variable resistor. Good luck!

[sinclairuser]

Some news from the real metal-detecting world!
btw. a thin chain is huge compared to this here:

[ATTACH]39967[/ATTACH]

which I found with the Makro Racer with 28cm coil plus modified Garrett Pro Pointer.
Its a record - the smallest handmade nails I have ever found so far!
Besides: Everything detected by vibration - size ca. 7mm.

Without modified pinpointer - no chance!
I had spread just a little bit of the soil super flat over my hand and
it took me over 30 seconds to find out with the PP where the metallic thing is hidden.

nice find funfinder!, look like roman hob nails, the type from centurions sandals.

[viwaldi]

hi
My NUPI project is over. The pinpointer works. Electronics is already packed into the housing (32x210mm). Now only field tests. At home, the pinpointer is very stable.
Finally, the coil is wound on ferrite 9x60mm. Sensitivity adjustment (R1 and R2) on pcb but with access after removing the battery.





Now it's time for Nupi mod by chemelec (# 597)

[viwaldi]

[Virdi_248]

hi
My NUPI project is over. The pinpointer works. Electronics is already packed into the housing (32x210mm). Now only field tests. At home, the pinpointer is very stable.
Finally, the coil is wound on ferrite 9x60mm. Sensitivity adjustment (R1 and R2) on pcb but with access after removing the battery.

[ATTACH]42441[/ATTACH]
[ATTACH]42442[/ATTACH]
[ATTACH]42443[/ATTACH]

Now it's time for Nupi mod by chemelec (# 597)

I hope that I accompany you in all the exits of search, mine always comes in my bag, I am very happy. Surely it will give you many satisfactions, very beautiful.

[viwaldi]

Thank you for the good words

[viwaldi]

Nupi mod by chemelec woks
I changed R2A 68k to 4k7 - my coil is 0.5mm wire and has lower resistances. C8 I threw out because the sound was strange -> https://youtu.be/DZ42f5ohKLA. Buzzer and led are powered by stabilizer LM1117 sot-223 and not directly from 9V. R2 is on pcb, R1 is available externally.