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Post by lamazoid on Apr 22, 2014 23:51:53 GMT -8
My friend, who is addicted to digging with metal detector, recently asked me about "Pin Pointer". He has a big commercial metal detector with dish coil, which is pretty sensitive, but does not indicate exact position of metal, just an area about 30cm diameter. I never had an experience with metal detectors, but from this i assume that "Pin Pointer" fills this lack? And curiously, does the name "Pin Pointer" belong to the class of devices, or it's exactly your design, Gary? Anyway, buddy asked me to make something like that, and i think your last design will do: chemelec.com/Projects/Metal-Pin-3/Pin-3.htmI want to make it with surface mount parts, what do you think?
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Post by Gary Lecomte on Apr 25, 2014 19:53:50 GMT -8
My friend, who is addicted to digging with metal detector, recently asked me about "Pin Pointer". He has a big commercial metal detector with dish coil, which is pretty sensitive, but does not indicate exact position of metal, just an area about 30cm diameter. I never had an experience with metal detectors, but from this i assume that "Pin Pointer" fills this lack? And curiously, does the name "Pin Pointer" belong to the class of devices, or it's exactly your design, Gary? Anyway, buddy asked me to make something like that, and i think your last design will do: chemelec.com/Projects/Metal-Pin-3/Pin-3.htmI want to make it with surface mount parts, what do you think? A PIN POINTER is Specifically a Metal Detector for PIN POINTING a Precise Location. It is NOT a Name I made up. They have Very Little Distance of Detection (Usually Less than a few Inches), But shows a Precise Location. Surface mount would be Ok. But As I Added to my Article, This PIN POINTER also Detects Small Amounts of WATER. This can be a Problem. If that person has a Pulse Induction Metal Detector, you can just add a Ferrite Rod Coil to it for Accurate Pin Pointing. Gary
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Post by lamazoid on Mar 5, 2015 5:55:05 GMT -8
Some news about this project. I had no time to built anything, until recently friend made my head "drilled" about it it seems Spring comes early this year.. So i've quickly built this one from scratch patrs i had on hands : bypetrucho.narod.ru/minimax_pp.htmlwww.bypetrucho.narod.ru/md/minimax-pp/minimax_pp_sch.pdf (schematic file) and it seems to be working, detects about cent-sized coin from 3-4cm, and area of "pointing" is about 5-6cm diameter . so my question is: is this an acceptable result for "pin pointer" ? Will your pin-3 have better performance?
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Post by Gary Lecomte on Mar 5, 2015 7:18:00 GMT -8
Hi Lamazoid, Yes that is Acceptable distances for Coins.
If you use a Bigger Diameter Ferrite Rod (Or a Bundle of 3 of them), It will detect at a bit greater Distance. But than it will not "PIN-POINT", Quite as Accurately.
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Post by lamazoid on Mar 5, 2015 12:42:08 GMT -8
And what about your design? Also, can i replace both 2n3904 and 2n5088 with BC847B ? thats only thing that stops me from building it right now.
(my thought to that: replacement of 2n5088 with bc847 will reduce sensitivity, but how critical will that be?...)
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Post by Gary Lecomte on Mar 5, 2015 14:09:11 GMT -8
Yes, Probably Reduced sensitivity, But I Can't say for sure. I do not have access to European Transistors like the BC847
The Main difference between the one you built and the one of mine is the ability to detect TINY Pieces of metal. Probably No Difference in distance for detecting Coins.
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Post by lamazoid on Mar 13, 2015 3:53:04 GMT -8
here's pcb i have made for 0805 size components Chemelec-PIN3.lay6 (20.14 KB) (sprintlayout v6)
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Post by retiredat55 on Mar 13, 2015 3:56:45 GMT -8
Hi Lamazoid, How can I read this file? Can you send it in gif format or so?
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Post by Gary Lecomte on Mar 13, 2015 6:01:50 GMT -8
Pin-3.BMP (6.67 KB) Here is a BMP. Or you can go to Sprint Layout on the Iternet and Download a Sprint Viewer.
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Post by lamazoid on Mar 13, 2015 6:06:56 GMT -8
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Post by retiredat55 on Mar 13, 2015 6:46:45 GMT -8
Thanks both of you. I used the .BMP to look at the design.
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Post by Gary Lecomte on Mar 13, 2015 15:23:36 GMT -8
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Post by lamazoid on Mar 22, 2015 2:48:29 GMT -8
right from production i will solder this when i find time.
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Post by lamazoid on Mar 23, 2015 1:02:18 GMT -8
done now need to make coil...
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Post by lamazoid on Mar 23, 2015 6:24:39 GMT -8
Gary, i have ferrite rod 4*48mm , 3c90 material, which i want to use for detection coil. but no data about Al value. can you guess approx. number of turns for that ?
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