Can pinpointer detecting thin chain?

[Polymer]

Thought I might put this in here too, as that's where the idea came from.

Capacitor dielectric types

I found this whilst wondering and looking into the capacitors I would use in the Nupi pinpointer.
I thought caps were simple passive components and have come to realize that a project can
rise/fall with the right/wrong choice of capacitor. Thought I would share this.

CerCaps_Dielectrics.jpg

Found in:

How (Not) to Decouple High-Speed Operational Amplifiers - Texas Instruments

www.ti.com/lit/an/sloa069/sloa069.pdf

[Polymer]

Thanks for reminding me of the "dead bug style". Havn't done that since I was a teenager.

How far would the "bug" and especially the battery have to be from the ferrite core to be neutral?

I only have one pinpointer so far. Its ten years old only goes one inch deep and very simple but robust.
You probably know the vibraprobe 560. The shallow detection depth has its advantages in certain situations I deal with.
A pinpointer with buttons, knobs or cheap plastic is a no-no for me.

The Nupi-pinpointer goes deeper and has given me ideas for other situations where the vibraprobe can't help.
I will be testing the pinpointer in alkaline-clay/iron/wet-salt environment. So I have to build it pretty tough.

If I run into problems adjusting the Nupi-pinpointer I will be writing here. Otherwise I will be testing and will
be putting that up here too, albeit somewhat later probably.

Thanks again, Polymer

[Nupi]

Hi polymer,
Thanks for your comments.
The kit, I wanted not make by my self but a friend of mine wanted to make it. I have no time for.
You need not a circuit board. On a piece of perfboard is very good, fast and cheap,
or in a "dead bug style" or even the components soldering to each other on a piece of cardboard. Work great!!

regards nupi

[Polymer]

Hello Nupi,

Hmm, I have pondered about what you have written.

I had a company which produced small electronic devices which I shut down in 2001.
Why? With new rules & regulations coming with the EU into Germany & more & more bureaucracy
on a regular basis, I found more resources were going into the administration of all that, than into the product itself.
From my point of view that is insanity. Also moving from R&D thru to series production has pitfalls/setbacks that you could not
contemplate before.

I can very well understand why you would like to sell the pinpointer as an "experimental kit" privately and not as a business.

I find your price reasonable for the semi-completed pinpointer.

The question is what kind of potential buyers are out there?
Like you already said, you will not be putting out a finished product as an official company.
That leaves mainstream behind as possible customers and all those that want a "brand".

I would assume that technically inclined detectorists would be interested.

As for myself, I would not buy a semi-complete cast one as I would enjoy
and learn through the experience of playing around/experimenting with it myself
and then putting it together. The only thing I don't like doing anymore is making
my own pcb's.

Perhaps selling the pcb or pcb and/or components soldered or not or ferrite coil as parts or assembled
or cast in epoxy would leave it to the buyer to decide how far he wants to go with his own assembly or needs.
Sort of a pick-n-choose.

Some people might have difficulty getting the wire (I have that problem, it will take 2-3 weeks to get it),
others may have difficulty getting ferrite rods and others might have trouble getting certain capacitors.

In many cases I believe it is easier to buy all components in one go with you than sourcing many parts from all over the internet.

You might want to speak with Silverdog about this and perhaps he would be willing to put your things in his shop
or give you advice if you want to build your own online shop.

I've rambled on enough now, Regards

[Mcgaag]

Great project, I'm building this. Ordered the part already. Thanks!

[Davor]

Funny you should mention it, but only yesterday I made a coil for a pinpointer, Colpitts style. I started the usual way, winded several turns and calculated AL, and started winding, each layer separated by insulating tape. 90 turns should suffice, but I winded 100. When I measured it, alas, inductance was below the half of what was expected. I realised that with so many layers of tape, and dealing with a core that is not magnetically closed, the common knowledge of winding cores does not apply. I added some 60 windings more and got 1.6mH bang on.
Your approach with 3 cores makes sense with pinpointers. It is clumsy and counter-intuitive, but it makes sense.

[Nupi]

Thank You for your precise reply Nupi, I appreciate it!

I will definitaly try to build as to your specifications,
as I do not know what I am doing - yet.

I wouldn't expect support for something you have not built and/or tested,
so please don't be sorry. You have put a lot of passion and work into the
Nupi-Pinpointer as it is and I am glad for your reply!

Have a great weekend.

I know that for some it is difficult to make the coil and to adjust.
the pinpointer. I've been thinking about to make a working PP kit and to offer for sale.
The circuit and the coil molded in epoxy, and inclusive of all components,
(motor, buzzer, potentiometers, battery connector),but without housing.
But to be cost effective, it would still around 65,- euro, excluding postage.
I am not a business and can not give any guarantee.
But I do not know if there would be interest.

regards, nupi

[Polymer]

Thank You for your precise reply Nupi, I appreciate it!

I will definitaly try to build as to your specifications,
as I do not know what I am doing - yet.

I wouldn't expect support for something you have not built and/or tested,
so please don't be sorry. You have put a lot of passion and work into the
Nupi-Pinpointer as it is and I am glad for your reply!

Have a great weekend.

[Nupi]

Hello Nupi,

I am absolutely thrilled with your design and really appreciate and adore your step-by-step picture instructions!

Yes, yes, yes! I will be building a Nupi-Pinpointer

I do have a few questions though, argh:

Are the tolerances critical for R's and C's. Would it be better to use 1% resistors and 5% capacitors instead?

Could i use one piece of ferrite with 19mm diameter instead? Or perhaps asked better: how critical are the dimensionalities
of the ferrite core? I'm asking because I would like to make do with what I can get here locally.
An absolute heads-up on your construction

5% resistors can be used. The value of the capacitors are critical.
You can do some differ from the values but you need to know what you are doing.
You can use a different ferrite if you keep to the inductions.
You will need to use an induction meter.
If you can not build the same as in my example then I can unfortunately not give you support. Sorry!

[Polymer]

Hello Nupi,

I am absolutely thrilled with your design and really appreciate and adore your step-by-step picture instructions!

Yes, yes, yes! I will be building a Nupi-Pinpointer

I do have a few questions though, argh:

Are the tolerances critical for R's and C's. Would it be better to use 1% resistors and 5% capacitors instead?

Could i use one piece of ferrite with 19mm diameter instead? Or perhaps asked better: how critical are the dimensionalities
of the ferrite core? I'm asking because I would like to make do with what I can get here locally.
An absolute heads-up on your construction

[jwms]

Thanks for the update. My bad!!!! After I posted my query, I realized there were many more pages I needed to look through. I apologize for the stupid mistake on my part. All of you may laugh. I will not know if you do or if you feel sorry for me. I am laughing so it will not bother me as long as most of you do not tell me I am stupid. (I have a great sense of the humor of my mistake. Hope it brightens every-bodies day. A good laugh, even at oneself is good medicine.) I will start on it in the next few days so may have some questions if I run into any problems. Really like the features!! Thanks for the work that was put into this!!

[johnandles]

looking for something just like this. what size of wire used in the loops?

http://www.geotech1.com/forums/attachment.php?attachmentid=30692&d=1405848258

[jwms]

looking for something just like this. what size of wire used in the loops?

[detectoman]

jajaj GOD GLORY!

[Nupi]

hello nupi .. ufssts, wwwhhw.. then you is shure, real ? jajjaj -- may be you need any good vacations whit any fresh sea airs

Hello detectoman,---
What is certain? Nothing is certain, that's for sure. What is sure, when nothing is certain????
When nothing is sure and nothing certain, how do you know when something is certain or sure????????------- ------

Maybe you're right and I need Vacation!!!!! ------