Can pinpointer detecting thin chain?

[ionut_mtb]

isle of pines, new caledonia. i dont have small findings. it was very nice.

[Polymer]

Just to put the information out for reference ... on this great pinpointer.

The smallest things I have found in real digging situations with the NUPI PP other than iron specks:

Lead shot, diameter ~ 2.2mm, approx. 0.06 grams or 1 grain. Detecting distance 7-9mm.
Hard to find, even if its right in front of your eyes

Have a nice day!

[aliaf]

Hello everyone. Here I collected Pinpointer NUPI.
I can not insert a picture, tell me how to do it.

[Nupi]

Keep us informed about your findings. Good luck.

[ionut_mtb]

i will try to make a coil with 4ferite rod but i wait for the Lmetter.

[Davor]

In essence it is a solution based on old Whites AGC TR. It is great. The automatic version schematic is out there, but it is not tested.
I had some turbulent times at work and simply could not play more with detectors. Hopefully I'll have a bit more time now, and I'm itching to make something.

[ionut_mtb]

this is very good pinpointer, but to achive maximum sensibility need freqvent adjustment. without adjustment will still work, but the distance of detecting is smaller.
i also used it with 6inch coil, 50+50turns with coin distance 10cm perfect and also sensitive to small metals. i wait for the result of the automatic. great job nupi and davor!

[Davor]

Not yet. However, a friend have developed a PCB for it so it will happen soon. I'm slow.

[ionut_mtb]

hello, nice pinpointer, i've made it. davor did you build the automatic pinpointer?

[Polymer]

Hi Polymer,

I'm happy for you that in the end have overcome all the frustrations and have created some nice good working PP.
I am sure that this also comes through your perseverance.
The probe tips of polyamide are very professional, very nice.
I liked to have communicated with you and wish you the very best.

Nupi

Hello Nupi,

Thank you! I will see how long the polyamide will last. It is tough, BUT nylon
is one of the plastics that absorbs the most moisture. Like 50 to 100 times more than
say PP or PE.

I will write here about how well they are going in a year or so. I am using them
in a damp climate by the sea but not in the water.

Have a nice day, Polymer

[Nupi]

Hi Polymer,

I'm happy for you that in the end have overcome all the frustrations and have created some nice good working PP.
I am sure that this also comes through your perseverance.
The probe tips of polyamide are very professional, very nice.
I liked to have communicated with you and wish you the very best.

Nupi

[Polymer]

Hi Polymer,

I do not know how the engine of your PP is running but it should be like on this video. Nupi PP, made by Nezocas.

https://youtu.be/OvG9h2lsELU

http://youtu.be/b8D2bIoldLc

"The solution I found was simple, but I do not understand it
It is just a small capacitor (1n8 ) between the +- beeper-speaker connection".

Yes, sometimes there are strange things with electricity.
At low frequencies, interference suppression should be used often larger values capacitors, at high frequencies, interference should be used often low values capacitors.
My experience is that the arrangements of the components are very important for the proper functioning of the electronics.
All though Nupi PP is flexible by its small number and type of components.
But with oscillators is feedback through the Power lines or elsewhere mostly critical.
But that makes it more exciting.

regards,
nupi

Thank You for your reply, I did look at the videos a while back.
My vibration motors do the same as in the film.
It is not enough vibration to be really felt for me when slow beeping.
It doesn't matter though, I am very happy with sound and light.

I have now completed two Nupi pinpointers, one with three ferrites and a thin one.
Here are some pictures. I have not put much effort into "professional look", I made
them solid and switchable sound/light or both. The probe tips are made of polyamide.

The pinpointer at the top of the pic is my experimental one for field testing to see
if it is good for my needs. Hell yes it is! That's why I now made two proper ones.




Yes, the geometry of the electronics in the NUPI PP are important and surprising!

What a lot of fun, frustration and learning with this project

Thank You NUPI!

Best Wishes, Polymer

[eagle52]

Carl is right TRX hits the very fine chains very hard
And my properly adjusted Deus can detect very fine chain at almost 4" -chain is 2.67 Gr 18 " long

[Nupi]

Hi Polymer,

I do not know how the engine of your PP is running but it should be like on this video. Nupi PP, made by Nezocas.

https://youtu.be/OvG9h2lsELU

http://youtu.be/b8D2bIoldLc

"The solution I found was simple, but I do not understand it
It is just a small capacitor (1n8 ) between the +- beeper-speaker connection".

Yes, sometimes there are strange things with electricity.
At low frequencies, interference suppression should be used often larger values capacitors, at high frequencies, interference should be used often low values capacitors.
My experience is that the arrangements of the components are very important for the proper functioning of the electronics.
All though Nupi PP is flexible by its small number and type of components.
But with oscillators is feedback through the Power lines or elsewhere mostly critical.
But that makes it more exciting.

regards,
nupi



------------------------------------------------------------------------------------------------------------------------------
Jealousy is toxic poison to your soul.

[Polymer]

Hello Nupi,
Thank You again for your reply!

I do not know how an etrac sounds
But it must sound good then, or not !?

The vibration motors I have are for 1.5-3.0 volts.
They draw quite a bit of power 70-80mA when running.

It runs well when the beeping is very fast, but as I have said
it cannot give any vibration for single beeps when beeping is slower,
the motor only turns 1/2 - 1 revolution per beep. I think the beeps are to short.

I have read something about an overdrive mode for these motors and might try that.
I would love to have a very haptic PP where I can feel every beep to know the distance.

I have made a new experience making two new circuits for two final PP's.
The circuits work fine but there is something which really had me puzzled
and I changed all components and put in decoupling caps to see what it was.

It did not help. May it be the geometry of my new PCB's ??? The components
are the same as in the ones that sound great from the beginning.

Problem: when beeping it sounded not as good as the other circuits I built.

When touching the insulated + wire to the beeper-speaker the sound was
nice and harmonic again. When touching the insulated minus wire to the
beeper-speaker the sound gets really horrible and scratchy.

The solution I found was simple, but I do not understand it
It is just a small capacitor (1n8 ) between the +- beeper-speaker connection.

I will post photos, yes. The housings are ready and I am waiting for the 1k multiturn potis and 9v
battery connectors to arrive to complete them.

Have a great week and looking forward to hearing from you again,

Best Regards, Polymer