Can pinpointer detecting thin chain?

[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.

[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]

Pinpointer nupi and mini pinpointer on breadboard.

[Nupi]

Circuit in epoxy with normal parts (not SMD)

[Nupi]

Data of the Pinpointer nupi.

[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.

[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]

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.

[Davor]

Have you the possibility to try it?
It would be nice to involve you In this project.

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.

[Nupi]

Water resistant coil

[Nupi]

I think I'll give the 4024 portion of a detector a go in spice. It produces that distinctive varying repetition beeps, and seem quite an useful feature.
BTW, maybe a somewhat harder linking of a 4024 detector (pin 5) with the oscillator would be beneficial as it might turn the whole shebang into a super regeneration regime (very sensitive), and also make tuning less critical.

Have you the possibility to try it?
It would be nice to involve you In this project.

[Nupi]

Very nice presentation, Nupi. Thanks.

You're welcome.

[Davor]

I think I'll give the 4024 portion of a detector a go in spice. It produces that distinctive varying repetition beeps, and seem quite an useful feature.
BTW, maybe a somewhat harder linking of a 4024 detector (pin 5) with the oscillator would be beneficial as it might turn the whole shebang into a super regeneration regime (very sensitive), and also make tuning less critical.

[greylourie]

Very nice presentation, Nupi. Thanks.

[Nupi]

Here are all the schematics, drawings and pictures of the Pinpointer Nupi 2014
and the Mini Pinpointer Nupi 2014 final.
regards