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Offline mazari
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« Reply #860 on: August 31, 2016, 02:13:25 am »
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Thank you very much.I am not an expert electronics.All information taken from this forum.currently i'm using a circular coil 50cm.do you suggest 40us is a good samplig delay for gold?

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« Reply #861 on: August 31, 2016, 02:14:33 am »
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I read several threads but i didn't find a discussion about this. I try to explain: i have the sniffer xr-71 as metal detector/ powerscan pro2 (i think is a version a bit modified from the original sniffer xr-71), and i'm using the coil 1x1mt. I saw several deep metaldetectors as Garrett and other brands that use a double coil, one front and one rear (one tx and one rx). Someone know if it could be better as coil in the xr-71? I'm pretty sure that could be absolutely easier for everyone to use because you can hold in one hand, is smaller and maybe with more performance.
I took this idea from this:

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http://www.geotechru.com/security/se...l_detector_mg1




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Offline mazari
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« Reply #862 on: August 31, 2016, 06:40:47 am »
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thank you  for the infomation .please can you share the schema of this pwerscan .thank you in advance

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« Reply #863 on: August 31, 2016, 06:48:57 am »
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   Bosco91 :  Two Box detectors have there place but are only good larger objects.  Like the sniffer with a one meter coil.  Not going to be finding coins with that thing.  

  Mazari :  40uS is way late for Natural Gold but I think it should still be seeing  a gold ring.   Gold Rings are alloyed with Copper, Brass or Silver.  I think your coil may be most of the issue.

  Can you post a photo of your coil and describe it's build.  

Posted on: August 31, 2016, 06:46:17 am
  Powerscan is the Sniffer XR-71.

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« Reply #864 on: August 31, 2016, 07:45:48 am »
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my coil is 50cm-25turns-0.5wg

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http://www.3rbz.com/uploads/e844c0435bbe1.jpg


Posted on: August 31, 2016, 07:33:35 am
phone coil
l

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http://up.harajgulf.com/do.php?img=1055480


Posted on: August 31, 2016, 07:39:16 am

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http://up.harajgulf.com/do.php?img=1055508

sorry for mistake:0.5mm not 0.5wg

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« Reply #865 on: August 31, 2016, 07:54:57 am »
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Quote:Posted by homefire
  Bosco91 :  Two Box detectors have there place but are only good larger objects.  Like the sniffer with a one meter coil.  Not going to be finding coins with that thing.  

  Mazari :  40uS is way late for Natural Gold but I think it should still be seeing  a gold ring.   Gold Rings are alloyed with Copper, Brass or Silver.  I think your coil may be most of the issue.

  Can you post a photo of your coil and describe it's build.  

Posted on: August 31, 2016, 06:46:17 am
 Powerscan is the Sniffer XR-71.


Yes i don't use it for coins, but larger objective like helmets and so on. Do you think is it possible to have a coil like the link i sent before?
I noticed that is a bit different, maybe the powerscan is modified? I don't know but for example the powerscan has 2 large pin strip on the bottom (one with 10 pins and the other with 12 pins), the sniffer xr-71 no i saw from schema. Maybe is a project coming from the XR-71 and modified?

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« Last Edit: August 31, 2016, 07:59:11 am by Bosco91 »
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« Reply #866 on: August 31, 2016, 08:05:17 am »
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thankyou .t think is the same

Posted on: August 31, 2016, 08:03:06 am
my snifer xr-71

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« Reply #867 on: August 31, 2016, 08:17:30 am »
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I think is different (atleast i see the disposition of components are different). I post the picture of mine (i took from the web because i haven't now here with me) but you can see the disposition of components

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Offline Homefire
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« Reply #868 on: August 31, 2016, 08:42:50 am »
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   I can't find the link you talked about.  Please repost here.  Build a smaller coil.   Built a Lap top O-Scop while your at it.  That would be good enough to check out your Timing.


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http://www.instructables.com/id/DPScope-Build-Your-Own-USBPC-Based-Oscilloscope/


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« Reply #869 on: September 04, 2016, 03:18:03 pm »
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thank you very much homefier for all you help .i'll try to built this o-scope .many thanks

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