Can pinpointer detecting thin chain?

[Nupi]

Hi, Polymer,
It's nice to hear that you enjoy it.

The 2k2 resistor, I have chosen as a stable potential co-operation point of the transistor and the power consumption. It is a compromise as much in this life.
But if you find a better setting you should do it.

An oscillator is more complicated than an amplifier. R1 and R2 are the main set-point for the transistor, but also the coil has a important thing of his high-Q - vactor.
Also the preparation of the components, the type and brand of the components sometimes plays an important thing.
With so many complex data I just try it out.

My opinion is that you more learn with experimenting than a lot of formulas all trying to figure out, and it's more fun.

Oh, I forgot that you get at the Nupi pp for free a E-Trac (sound)
I'm not sure but I think the point of the oscillation of the IC 4024

No, PWM you dont need that.
The problem with the motor can have several causes.
It could be that you use the motor for a high voltage. An motor of 3-5 volts should be good.

The voltage at the base of the final transistor can be too low.

Show mee a photo if you've made the PP.

success,

regards nupi

[Polymer]

Hi Polymer.

"Could it be that the ferrite core is biased through the earths magnetic field?
Have you experienced this with the Nupi Pinpointer?"

Yes I have.
You're right, that's because the earth magnetich field lines.
You're a good observer Polymer.

This phenomenon can also be had with the older TVs.
I thought that a TV, for instance Europe, not just in Mexico could use for their difference in earths magnetic field.
You got color dispersion on the the screen image. (The earths magnetic field are not the same everywhere on the earth).

I'm sure there are more people on Geotech that can tell you more about this phenomenon.

The influence of the earths magnetic field, on a IB - metal detector in connection
with mineralized ground is also of great importance for the detection depth.

But you should see this as a gift from Nupi.
You have not only a good PP but a compass to.

regards nupi.

Hello Nupi,

Yessssss ... You get one compass AND inclination meter with every Nupi PP absolutely free

Thank you for your feedback. I remember the tv colors being funny for a while when we moved continents.
That was an old style CRT one. An interesting topic that has me excited somehow. Here's a nice map:



I have built a quick & dirty Nupi PP housing for real field testing, here pic:



I used it on a rocky beach with clay and some sand leftovers to go into holes and cracks.
I did have to adjust often dependent upon ground matrix and direction pointed. It was in
use for around 7 hours. Yes, my muscles were hurting after this day ...

The luxury of being able to detect deep with the pinpointer far outweighs the extra work of re-adjusting for me.
It became a reflex after a few hours. In the terrain I was in, even a 6x4 inch coil seems HUGE and hard to use.

So I am really happy with it and am now constructing proper housings for the coil and electronics.

I have also been playing around with the components. I changed the 2k2 resistor to 1k and then 500 Ohms.
I found that power consumption goes up by about 50% and I can reduce the adjustment resistor considerably.
My question here is: is the 2k2 chosen for a reason? Is this important?

My next experiment was finely adjusting at the top of the pyramid in your drawing. I get a very high tone, I think
it is the ~16kHz tone. They reaction to metal is that the pinpointer gets musical and plays different frequencies
in steps as the metal gets closer. That was fun. How can this be with just a binary counter connected?

Last, but not least, I connected a vibration motor to the circuit. The motor only turns 1/2 revolution per beep
so I could not feel this until the beeping is very fast. I tried to find a solution on the internet
and it seems like I would need PWM for this. Do you know of a simpler solution?

Thank you for this wonderfull gift AND the free compass

With kind regards, Polymer

[Funfinder]

if the nupi-pp is a magnetometer, too,
its even more better and sensitive!

Don't care and make trouble, but try and get exp. to handle it - if its shape is correct (pentetration tip like a vibrator).

The more sensitive the better - you need a pinpointer anyway that is as good as a MD with 10cm or 4 inch coil, believe me!

[Nupi]

Hello Nupi.
Today even experiment with pinpointer on the breadboard.
Works just as well with capacitors Evox Rifa PHE450.
Tried several coils, similar parameters - all OK. Sensitivity remained almost unchanged.
But putting a chip CD4024BE stand together before the chip HFE4024 pinpointer silent. Apparently for CD4024 BE need to adjust the component values.
Hence it can be concluded that the more critical to pinpointer component (chip capacitor C2) and less critical to the coil (its shape), while maintaining a predetermined range of inductance.

Hi aliaf,

A capacitors Evox Rifa PHE450 is a MKP capasitor.

My experience with different coil showed that the, three core coil, gives 30% more depth.

The HFE4024 I have noticed no difference but it's an interesting observation.

regards nupi.

[Nupi]

My Nupi Pinpointer now does not react to breath anymore, I sprayed the pcb with transparent acrylic paint.
I have epoxied the ferrite and siliconed the pipe and went to the beach to test it.

It works very well, but needed frequent adjusting to keep it at maximum sensitivity.
The beaches here have a lot of iron in them. I will post photos of the NPP next time.
It worked in the salt water too, but I couldnt make depth measurements, the sea was rough.

Nupi, I found that sensitivity of the pinpointer is also dependent of the DIRECTION the pinpointer is facing.
I first thought it was something in my house, but it is also at the beach.

When facing SOUTH and the SKY at around 45° it beeps the fastest.
When facing NORTH and the SKY at aroung 45° it beeps the slowest.

Could it be that the ferrite core is biased through the earths magnetic field?
Have you experienced this with the Nupi Pinpointer?

Just adjust to the sensitive point when its facing north and test it facing south.
That should make it bip, bip, bip....

I wonder what else it could be.

With kind regards, Polmer

Hi Polymer.

"Could it be that the ferrite core is biased through the earths magnetic field?
Have you experienced this with the Nupi Pinpointer?"

Yes I have.
You're right, that's because the earth magnetich field lines.
You're a good observer Polymer.

This phenomenon can also be had with the older TVs.
I thought that a TV, for instance Europe, not just in Mexico could use for their difference in earths magnetic field.
You got color dispersion on the the screen image. (The earths magnetic field are not the same everywhere on the earth).

I'm sure there are more people on Geotech that can tell you more about this phenomenon.

The influence of the earths magnetic field, on a IB - metal detector in connection
with mineralized ground is also of great importance for the detection depth.

But you should see this as a gift from Nupi.
You have not only a good PP but a compass to.

regards nupi.

[aliaf]

Hello Nupi.
Today even experiment with pinpointer on the breadboard.
Works just as well with capacitors Evox Rifa PHE450.
Tried several coils, similar parameters - all OK. Sensitivity remained almost unchanged.
But putting a chip CD4024BE stand together before the chip HFE4024 pinpointer silent. Apparently for CD4024 BE need to adjust the component values.
Hence it can be concluded that the more critical to pinpointer component (chip capacitor C2) and less critical to the coil (its shape), while maintaining a predetermined range of inductance.

[Polymer]

My Nupi Pinpointer now does not react to breath anymore, I sprayed the pcb with transparent acrylic paint.
I have epoxied the ferrite and siliconed the pipe and went to the beach to test it.

It works very well, but needed frequent adjusting to keep it at maximum sensitivity.
The beaches here have a lot of iron in them. I will post photos of the NPP next time.
It worked in the salt water too, but I couldnt make depth measurements, the sea was rough.

Nupi, I found that sensitivity of the pinpointer is also dependent of the DIRECTION the pinpointer is facing.
I first thought it was something in my house, but it is also at the beach.

When facing SOUTH and the SKY at around 45° it beeps the fastest.
When facing NORTH and the SKY at aroung 45° it beeps the slowest.

Could it be that the ferrite core is biased through the earths magnetic field?
Have you experienced this with the Nupi Pinpointer?

Just adjust to the sensitive point when its facing north and test it facing south.
That should make it bip, bip, bip....

I wonder what else it could be.

With kind regards, Polmer

[Nupi]

Here's a link to the video. The quality is not very good, filmed web cam computer.
http://youtu.be/HVu8DPwGDm8

Hi aliaf,

You made a perfect Nupi pinpointer on a breadboard with the small coil and great performance.




regards, nupi.

[aliaf]

Here's a link to the video. The quality is not very good, filmed web cam computer.
http://youtu.be/HVu8DPwGDm8

[Nupi]

Hello Nupi.
Seal the installation, nashol capacitor MKP 33 nf 1000 v everything worked perfectly.
It turns out the whole thing was in the condenser. Incidentally experimented with different film capacitors 33 nf, no one did not work.
Generally a capacitor MKP everything works fine.
Sensitivity to copper coin with a diameter of 23 mm - 7 cm.

Hi aliaf,

So it was still the capacitor.

I have often said that it should be used an MKP capacitor and I say that not for nothing.

I hope others have finally learned from your experience.

Anyway, congratulations with the pinpointer.

regards, nupi.

[aliaf]

Hello Nupi.
Seal the installation, nashol capacitor MKP 33 nf 1000 v everything worked perfectly.
It turns out the whole thing was in the condenser. Incidentally experimented with different film capacitors 33 nf, no one did not work.
Generally a capacitor MKP everything works fine.
Sensitivity to copper coin with a diameter of 23 mm - 7 cm.

[paku]

who have make design with sprint layout
can you share here

[Nupi]

Hi aliaf,

Thanks for the image.

I think your breadboard have too much capacity.

I would recommend you to solder the pinpointer on a piece of Cartonboard.
The components paste you fixed with adhesive tape on the carton.
This is easy and fast.
You can quickly detect errors in this way.

I can not see if the windings are correct but,
you have very good wrapped the coils.

regards nupi.

[Nupi]

Hi Davis9000,

Very good work you've done.

Thank you for sharing it with us.

regards nupi.

[Davis9000]

I made the coil following the instructions in this threads 4 page.

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.