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Offline Homefire
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« Reply #850 on: August 29, 2016, 12:46:08 pm »
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  Start by turning down the Elimination or Discrim pot full CCW.

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« Reply #851 on: August 29, 2016, 02:56:12 pm »
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hello.i have turned the pot for different position -very low-high-medium i still have the same problem

Posted on: August 29, 2016, 02:42:43 pm
i'm using this version schematic of dp(sniffer xr-71)

Posted on: August 29, 2016, 02:49:05 pm
sorry.could'nt upload the schema

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« Reply #852 on: August 29, 2016, 03:19:58 pm »
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  It detects other metals?  Without a O scope your shooting in the dark.    Did you make this detector ?  What coil are you using ?  Independence and ohms ?    Is it a home made coil ?

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« Reply #853 on: August 30, 2016, 07:19:39 am »
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Thank you for your interest and help.i have builtThis device(dp)  from  this forum.And works very  fine my coil is:27turns 0.5mm wind on 50cm form 3ohm resistance .it can detect all metals except gold.and with good dept a piece-60cm - of  alluminium detected over 2m.on air .

Posted on: August 30, 2016, 07:05:18 am
i'm using this version

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« Reply #854 on: August 30, 2016, 08:37:37 am »
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  With out a O-Scope all we can do is fuddle.  I have the schematic .   My guess is your Samples just are not fast enough.  Will it detect a small peace of lead like bird shot or bullet ? 

Do you know anyone with a scope?  TV Repair person ?  Looking for more info.  WIll be back.

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« Reply #855 on: August 30, 2016, 09:03:13 am »
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many thanks homefire .I appreciate your help .but how can i adjust sample delay for gold if i found a scope?

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« Reply #856 on: August 30, 2016, 09:46:58 am »
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  You need to do your home work.  You need to measure the Sample delay from the time the TX pulse ends to the time the sample is taken. 


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« Reply #857 on: August 30, 2016, 10:30:28 am »
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Thank you again,homefire .Best regards.




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« Reply #858 on: August 30, 2016, 10:37:38 am »
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  Let see what your delay is doing first.  Problem may just be the coil. Were did you find the coil information ?  Are you experienced in electronics ?

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« Reply #859 on: August 30, 2016, 07:36:23 pm »
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Did more digging for info.  Seems the Delta / Rx71 Is geared around larger coils.  What kind of coil did you make ?

Sample delay is a bit long for my liking shortest being 40uS . 

The original searchcoil of the delta pulse was measured at 1000 uh [micro-heny] inductance.
      Try not go below 2.4 ohms dc resistace on your search coil. As you can see on the schematic
      R51 has been added [1 ohm 1 watt]in series with T1 [IRF740]for current protection .

      A 60 cm coil is 25 turns of 0.5 mm wire .
      a 42 cm coil is 29 turns of 0.5 mm wire . Always measure final DC resistance on your prototype
      search coil and always try to be above 2.4 ohms . You can put a heat sink on T1 !!
      be above 2 ohms !!



       In the chart it shows a Range Sense I'm not sure what that does.  Maybe someone can help with that.



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