Can pinpointer detecting thin chain?

[Nupi]

Of course I can try it. There are a few caveats though, all related to the CMOS inputs being modelled a bit off, and this particular implementation dances about the switching thresholds. I can use a pair of inverters that are modelled with MOSFETs to mimic the input conditions properly.
I need a pinpointer, and this project seem just right. Yeah, I could contribute a little. I'm not in my full DIY mode right now though.
BTW, did you consider air coil for this one? It would require far more turns of preferably thinner wire, but in the end may result in something far more repeatable. I have a stash of small square plastic boxes, and such box could accommodate an air coil inside, so that the whole design remains small, compact and intrinsic. Otherwise I'd fit it into a tube of some sort and use a ferrite.
I'm also curious - how did you come up with the 4024 detector design? It is very Zen-like and I like it that way.

I have not tried it with an air coil.
If you would like to do that would be great.


As you know, the wheel already invented.
The only thing I do is improving and combining circuits.
And then I grab a gum eraser 90% off.


I believe that we often think too complicated.
I love simple solution.I'm lazy.

[Harp]

Can you give me information, which is the voltage on the Emitter of BC560 while the unit is in standby mode, and which is the voltage on the Emitter while the ferrite touched the metal?
Thank you!

[Nupi]

Can you give me information, which is the voltage on the Emitter of BC560 while the unit is in standby mode, and which is the voltage on the Emitter while the ferrite touched the metal?
Thank you!

The voltage depends on the setting of R1 and R2, but the point that he has not yet been detected is around 3.23volt.
At maximum detection is 2.25 volts.

[Nupi]

Data of the Pinpointer nupi.

[Nupi]

Circuit in epoxy with normal parts (not SMD)

[Nupi]

Pinpointer nupi and mini pinpointer on breadboard.

[Waikiki_Sweep]

Data of the Pinpointer nupi.

> Operating frequency is 16 kHz.

It is awesome! You are in VLF frequency range!
It will let this device to penetrate ground well instead of constructions using higher frequencies.

Also check your L1 and L2 inductance they matching TX and RX coils of many VLF detectors.
I am sure you can switch your pinpointer coil with usual VLF detector coil and use it as a good metal detector too.
So you need only your pinpointer electronic block and two coils: VLF DD or concentric and original coil with ferrite core to go to the field.
Make coils switchable.

[Nupi]

> Operating frequency is 16 kHz.

It is awesome! You are in VLF frequency range!
It will let this device to penetrate ground well instead of constructions using higher frequencies.

Also check your L1 and L2 inductance they matching TX and RX coils of many VLF detectors.
I am sure you can switch your pinpointer coil with usual VLF detector coil and use it as a good metal detector too.
So you need only your pinpointer electronic block and two coils: VLF DD or concentric and original coil with ferrite core to go to the field.
Make coils switchable.

Thanks for the tip, a great idea.
But its would be great if you maybe could dilever active contribution.
I'm sure that the project would increase its value.
Thanks in advance.

[Nupi]

My wife says I make terrible mess.
I think she exaggerates.

My other hobby has to wait.

[chemelec]

16 Khz is in the Audio Range.

[Nupi]

16 Khz is in the Audio Range.

Yes that's right.

[Waikiki_Sweep]

16 Khz is in the Audio Range.

Formally it is audio but I am not sure I can hear 16 kHz freely in my age, my daughter sure can.

Wikipedia:[Very low frequency or VLF refers to radio frequencies (RF) in the range of 3 kHz to 30 kHz and wavelengths from 10 to 100 kilometres.]

Metal detectors working in VLF frequency range are able to penetrate ground better. Metal detector or pinpointer working on 100 kHz will loose more signal strength in the ground.

Also 16 kHz is good to find small gold targets. Lower frequencies are used for bigger or more conductive targets.

That is why 16 kHz Nupi pinpionter especially good to find small gold!

Some examples of VLF metal detectors frequencies:

Whites Spectra V3 uses three frequencies – 2.5 kHz, 7.5 kHz and 22.5 kHz.
Minelab Excalibur sends out 17 distinct frequencies ranging from 1.5 to 25.5 kHz.
Fisher CZ has two frequencies 5 and 15 kHz.
Garrett ACE 250 metal detector has an operating frequency of 6.5 kHz.
Fisher F2 runs at 5.9 kHz.
Fisher F5 - 7.8 kHz.
The AT Pro is in the 15 kHz range.
Tesoro Vaquero is around 14 kHz.

[Nupi]

[QUOTE=Waikiki_Sweep;187165]Formally it is audio but I am not sure I can hear 16 kHz freely in my age, my daughter sure can. ..........QUOTE]

And my dog too!!

I have not seen him for days.

[Nupi]

I was planning to sale Carl this High End Coil for the TRX,
I changed my mind because I think he will find it too advanced.


What do you think?

[Waikiki_Sweep]

I was planning to sale Carl this High End Coil for the TRX,
I changed my mind because I think he will find it too expensive.

What do you think?

Tomato fits better in ferrite ring or cap. You should try bigger diameter core and you will see some distance increasing.

I like the idea of long range pinpointers like yours because in many cases you can pinpoint target from the surface.

With regular pinpointer you have to dig holes an poking your pinpointer into it all the day.