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Offline karpiidi
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« Reply #830 on: June 06, 2015, 09:44:17 am »
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Quote:Posted by mazari
thank you karpiidi .but now without a coil i have a  continuous sound and only pot of threshold is working .what would be the problem ?please help me thank you for all your help.


Might be several reasons, but first of all, we must rule out possible errors in PCB. Also Possible components with wrong value, or in wrong place..
Can You take good quality, close up photos of board, both sides, so we can have a look.
And what battery do You use, components getting hot or warm?
Threshold working, how do You know ? If continuous sound... Or does sound decrease when turning potentiometer ?

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« Last Edit: June 06, 2015, 10:01:14 am by karpiidi » 		Logged
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« Reply #831 on: June 07, 2015, 11:10:35 am »
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THANK YOU karpiidi.



Posted on: June 07, 2015, 10:54:17 am
hi karpiidi i can't upload the attachement

Posted on: June 07, 2015, 11:02:03 am
please can give me  your email to send you some photos and a video ? .thank you advanced

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Offline mazari
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« Reply #832 on: June 08, 2015, 02:08:33 pm »
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hi again. still the same problem when i connect my coil irf  get very hot .the red led  becomes on  and ne556 be  damaged .can any one help me?.thank you

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Offline mazari
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« Reply #833 on: June 10, 2015, 07:09:24 am »
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no one can help?

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Offline Karl
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« Reply #834 on: June 10, 2015, 10:22:48 pm »
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I believe  your  answer  has already  been  posted .

Perhaps  you should  reread the  responses .

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"Keep Digging Its Down There Somewhere" Treasure Hunting, Gold and Coins.

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Offline mazari
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« Reply #835 on: June 11, 2015, 04:35:47 am »
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many thanks for all

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Offline mazari
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« Reply #836 on: August 03, 2015, 05:32:27 pm »
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hi for all .i have built a new coil for my dp:diameter 60cm 25 turns but i don't know what would be the damping resistor?please help me.thank you

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Offline Bosco91
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« Reply #837 on: April 01, 2016, 10:49:55 am »
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Quote:Posted by mazari
hi again. still the same problem when i connect my coil irf  get very hot .the red led  becomes on  and ne556 be  damaged .can any one help me?.thank you


If the IRF is very hot maybe is a problem of resistance of the coil......if you have a resistance low you could burn your IRF. Try with a coil with more turns with an higher resistance if it's still hot

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Offline mazari
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« Reply #838 on: July 06, 2016, 08:17:10 am »
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Hello Everyone.my dp now is working very well -thank you for help- but the  Only problem i faced is that there was no sensitivity to gold i can't detect gold at any distance? please can you help me what can i do to make it sensitive to gold?thank you in advance

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« Reply #839 on: August 21, 2016, 05:31:25 pm »
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PLEASE AYUDA .. INTEND TO USE ALL RESISTOR 1 PERCENT FOR,, XR71. DELTA.
THAT HAPPENS ?
LOSING POWER?

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