Does anyone know how to make a pinpointer?

[azigta]

Hi, I was wondering if anyone knows how to make a pinpointer. Does anyone have some info on that?
I found a simple schematic here, but I still don't know how to make a 100uH coil. I think I have to buy a coil meter, my multimeter doesn't have coil measuring option...

Maybe someone here knows.

Thanks

[Carl-NC]

The CS209 is unobtanium. The easiest thing is to buy a cheapy stud finder and convert it. If you really want to build from scratch, I recommend getting Inside the Metal Detector, ironically one of the projects is a pinpointer. Otherwise, these forums are chocked full of information, but it requires a little diligence on your part.

- Carl

[chemelec]

They are Available, I have Both the CS209's in a 8 Pin Dip and also the Similar TL0161's in a SMT Package.
But their range of Detection is Quite Small and don't really make a good Pin-Pointer.

[azigta]

what about this one? http://www.geotech1.com/pages/metdet...ts/edn/edn.pdf It looks easy. No pcb but maybe I can make one with eagle cad. What do you guys think? I don't know much about this...

[Teleno]

Hi, I was wondering if anyone knows how to make a pinpointer. Does anyone have some info on that?
I found a simple schematic here, but I still don't know how to make a 100uH coil. I think I have to buy a coil meter, my multimeter doesn't have coil measuring option...

Maybe someone here knows.

Thanks

https://www.aliexpress.com/wholesale...rchText=CS209A

[Teleno]

TI inductance to digital converter LDC1000 http://www.ti.com/lit/ds/symlink/ldc1000.pdf

Evaluation module with software GUI: https://www.aliexpress.com/wholesale...chText=ldc1000

[Skippy]

Quote:"..... the CS209's in a 8 Pin Dip and also the Similar TL0161's ..... their range of Detection is Quite Small and they don't really make a good Pin-Pointer."
I have to disagree here, Gary. I've tinkered around a lot with a Sherlock DTS-Pro, which is a budget pointer based on the 209 chip. As manufactured, the pointer is adequate, it's hampered by a standard 9mm ferrite rod probe, and a too-high operating frequency of about 100 KHz.
If you equip it with a bigger rod, like 12.5mm it's range increases, and dropping the operating freq to nearer 50KHz helps. It then picks up tiny finds rather well, significantly out-performing pointers like the 13kHz Garrett Propointer, which struggles on targets like tiny medieval coins, airgun pellets.

It's a shame the chip has been discontinued, though for a one-off project, I'm sure they can be sourced.

The original Sherlock probe has been superceded by a Sherlock II, which I guess uses the very similar part you mentioned, though I've not seen one in the flesh.

[chemelec]

Quote:"..... the CS209's in a 8 Pin Dip and also the Similar TL0161's ..... their range of Detection is Quite Small and they don't really make a good Pin-Pointer."
I have to disagree here, Gary. I've tinkered around a lot with a Sherlock DTS-Pro, which is a budget pointer based on the 209 chip. As manufactured, the pointer is adequate, it's hampered by a standard 9mm ferrite rod probe, and a too-high operating frequency of about 100 KHz.
If you equip it with a bigger rod, like 12.5mm it's range increases, and dropping the operating freq to nearer 50KHz helps. It then picks up tiny finds rather well, significantly out-performing pointers like the 13kHz Garrett Propointer, which struggles on targets like tiny medieval coins, airgun pellets.

It's a shame the chip has been discontinued, though for a one-off project, I'm sure they can be sourced.

The original Sherlock probe has been superceded by a Sherlock II, which I guess uses the very similar part you mentioned, though I've not seen one in the flesh.

I have Never seen or Used a Commercial made Pin pointer, So I don't know what their sensitivity or distance is.
The CS209, Just doesn't seem to have a good Distance.

Yes I agree a bigger Rod and lower frequency Increases Distance and Sensitivity.

And there are Lots of the CS209A Available On EBAY, from China, But Not Cheap

[azigta]

I think I'm going to buy a chinese "tx-2002" pin pointer for 14€. I've seen videos on youtube and it looks like it's good enough for me. I can't find any other cheap pinpointers apart from that one. There's a tx-2003 that has more like a "tubular" body for 20-25€ but for what I've seen, it just performs the same as the tx-2002. I may buy it in the following days, I don't feel it's worth paying 8€ for the cs209+making it (I don't have the copper wire so I would have to buy it also) Maybe Is best to buy that chinese tx-2002

[eclipse]

Here is simple enough schematic of a pinpointer Gnom-M ("ГНОМ-М")


Full info you can see at the author's website:

http://www.radiodom.org/index/pinpoi...nom_m_quot/0-8

[kt315]

direct link on a PP subforum, in russian, you have to use a babelfish translator.

http://www.md4u.ru/viewforum.php?f=1...d0f6894790d876

[woodbob123]

I recently put a post up describing how I made a mini-max pinpointer using easily available parts and veroboard results were as good as a garrett.

[azigta]

That's a great pinpointer! My computer doesn't have paralel port but I have a computer that has it that I saved because I knew someday I would have to use a paralel or serial port to program something xD

In the russian page it says that "Coils are wound on top of one another and comprise 200 turns of insulated copper wire 0.2-0.3mm wire winded over a 5-10cm long 10mm diameter ferrite core (used in transistor radios)". So two 200turn coils on top of one another? is that right?.

I recently ordered 0.4mm wire and I'm going to have about 8 meters of it left when I finish making the search coil for the geotech barracuda, maybe is enough for this project. Could I use 0.4mm wire instead of 0.2-0.3?

And then it says "Observe the polarity, so in the absence of the generation (frequency of 15-20khz) need to change any of the ends of the windings" I don't understand that very well.

I can get a attiny13 or 25, I understand that I can use either one of them If I flash it with the appropiate file attached at the bottom of the page.

I also read the following thing: "Tincture is reduced to the selection of + 1V to the second output of the microcontroller trimmer R2, in the absence of a number of metal objects."

I guess what it says there is that I have to measure the second output of the microcontroller while I adjust R2 trimmer until it measures +1V, if so, could anyone indicate me where the "second output" of the microcontroller on a attiny13 is?

Thanks, I think I'm going to build this one, it looks like it's easy to build except for that few questions that I have. I have plenty of time so I will put effort on this and I'll read that russian translated forum to get more information.

Lots of questions but it looks promising. For now I'm going to keep up looking for more details

[azigta]

I recently put a post up describing how I made a mini-max pinpointer using easily available parts and veroboard results were as good as a garrett.

Could you post a link? Maybe if it's easier than the russian one or the resources to get informations are in english (and therefore easier to understand xD) I may build it instead of the russian one. Thanks

[kt315]

Could you post a link? Maybe if it's easier than the russian one or the resources to get informations are in english (and therefore easier to understand xD) I may build it instead of the russian one. Thanks

LOL! minimax is russian one.