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Offline mazari
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« Reply #780 on: January 23, 2015, 04:28:43 pm »
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please help me i just finished building  snifer xr-71 single side pcb posted by eugene.my question is how to adjust it?thanks verry much

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« Reply #781 on: January 23, 2015, 07:22:25 pm »
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    I would send Eugene a PM if I was you.    This may help you.   

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http://www.geotech1.com/forums/showthread.php?21325-For-sale-bare-boards-for-Delta-Pulse-Sniffer-XR-71&highlight=kt315


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« Last Edit: January 23, 2015, 07:28:06 pm by homefire »
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« Reply #782 on: January 24, 2015, 04:27:36 am »
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i have built single side pcb snifer xr -71 posted by eugene-thanks

Posted on: January 24, 2015, 03:50:16 am
thak you verry much. have anice day

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« Reply #783 on: January 24, 2015, 07:41:12 am »
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Quote:Posted by mazari
please help me i just finished building  snifer xr-71 single side pcb posted by eugene.my question is how to adjust it?thanks verry much


From Delta Pulse, adjust trimpot (200K or 220K ) to 100-120Hz for Delta Pulse, 300Hz for XR-71,...but I prepare adjusting trimpot on actual testing of some metal objects.

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« Last Edit: January 24, 2015, 07:54:19 am by Saromines »
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« Reply #784 on: January 24, 2015, 03:37:17 pm »
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thank you for the attachement.

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« Reply #785 on: February 02, 2015, 03:23:11 pm »
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hi for all . when i turn on my dp the ua 556 become very hot .what's the reasons for that?and the sound is very weak.please help me toTo solve this problem.thank you advanced.

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« Reply #786 on: February 04, 2015, 07:51:01 am »
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Quote:Posted by mazari
hi for all . when i turn on my dp the ua 556 become very hot .what's the reasons for that?and the sound is very weak.please help me toTo solve this problem.thank you advanced.

Remove IRF740 then try again if 556 becomes hot again remove NE556 check your supply,.Pin#7 and 14, VD8-VD9..check for possible short components, pcb tracks and last try new NE556.

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« Reply #787 on: February 04, 2015, 10:42:25 am »
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many thanks for your answer

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« Reply #788 on: February 06, 2015, 03:07:00 pm »
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hi for all.i removed the irf740 now ua 556 is good . but i have some problem:When i power switch ON the green led turn on and the red turn off.microamp move up and come back to zero. sound in the speaker start tick tick tick when i adjust threshold to left sound disappear.please guide me what must i do?

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« Reply #789 on: February 06, 2015, 06:10:48 pm »
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Quote:Posted by mazari
hi for all.i removed the irf740 now ua 556 is good . but i have some problem:When i power switch ON the green led turn on and the red turn off.microamp move up and come back to zero. sound in the speaker start tick tick tick when i adjust threshold to left sound disappear.please guide me what must i do?


I think that's the indication that your DP is working good, GREEN LED is for power on indicator, RED LED is for low battery and for meter that's normal, connect search coil  and touch the IRF740( i used IRF840 with this) if it is hot try sub. dumper diode around 1K5 down to 680 Ohms and make some testing. By the ways whats the size of your coil and how many turns?

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« Last Edit: February 06, 2015, 06:17:35 pm by Saromines »
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