dave
Junior Member
Posts: 56
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Post by dave on Oct 9, 2016 18:58:28 GMT -8
Hi all , hi Gary ,.....comment on your pulse 1 , I'm very impressed with this build Gary. This machine is ultra stable and I really like the non motion side of the device . You have mentioned a few times that shielding isn't necessary on the coils ( I live on an Australian goldfield ) , however if I was to install shielding will this have any detrimental effect on the performance of the detector. I will be using graphene /graphite ....50 - 80 % single to 3 layer atomic carbon . This has a higher conductivity than normal graphite but I'm sure it is low enough so as not to allow eddy currents to perpetuate. And its not as messy or non adhesive , just paint it on (2 coats at 90 degrees to each other and a buff when dry ) even insulation tape will stick to this stuff. On a lighter side if I added enough graphene ( I make my own through electrochemical exfoliation of graphite sheet ) and compressed it with another compound I would have a coil cover you could not pierce with an AK47 .....actually true! Anyway I digress , I'm sure I will find out the hard way but that would mean pulling the coil apart again , they are never the same when disturbed . Cheers Dave.
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Post by Gary Lecomte on Oct 10, 2016 9:15:19 GMT -8
Shielding Does Reduce Noise and eliminate some Ground Effects, but it also reduces Sensitivity a bit. But considering your Mineralization in Australia, it may help.
Sometime, Making this Detector with Dual Cancelling Coils can also help eliminate these problems.
Here in Canada, I find Shielding the coil has no Advantage.
Not sure if I have ever talked to you before, But Australia is a Free Phone call for me, If you want to talk.
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dave
Junior Member
Posts: 56
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Post by dave on Oct 10, 2016 12:00:37 GMT -8
Thanks Gary , that's what I wanted to hear . So shielding it is then . Yes you have spoken with me a couple of times recently ( Dave .H . from N.S.W. ) regarding a kit . All good and is running like a clock ! My high tech phone wont send picture msg's nor will wifi or blue tooth work .'No driver exists' says the computer .So I'm going to resort to my computers web cam by holding things in front of it and taking a photo ..sigh .Hopefully I will be able to post them ......Cheers Dave.
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dave
Junior Member
Posts: 56
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Post by dave on Oct 11, 2016 18:54:55 GMT -8
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dave
Junior Member
Posts: 56
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Post by dave on Oct 11, 2016 19:16:56 GMT -8
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dave
Junior Member
Posts: 56
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Post by dave on Oct 23, 2016 17:42:09 GMT -8
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Post by Gary Lecomte on Oct 24, 2016 9:16:03 GMT -8
LED Voltmeter? Somewhat a Waste of battery power?
Might be good to Add an On/Off Switch for it.
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dave
Junior Member
Posts: 56
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Post by dave on Oct 25, 2016 22:18:00 GMT -8
Yes it has an on /off switch on the end not shown , waste of time and power as you can't see these very well in daylight .Good to have some idea of battery level now and then.
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Post by radioman on Oct 30, 2016 10:44:05 GMT -8
Appreciate your posting this project along with the interesting photos. As you use your detector more, please let the forum know about its performance (e.g., depth of detection, shielding effects, battery life, what you would change if you made another one, etc.). Nice job!
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dave
Junior Member
Posts: 56
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Post by dave on Oct 30, 2016 18:09:28 GMT -8
Thanks , Radioman . I get out as much as I can around here . Mineralization is monumental here and diminishes the depth of detection considerably on ANY type of detector .I have been experimenting with various types of shielding but nothing seems to get more depth . Admittedly I have been prospecting a reef so there are all kinds of rich deposits of minerals . The site near the reef has yielded many items , mostly iron and aluminium also a few coins . So I know the detector is working ok . You just have to accept the ground noise and try to "tune" around it. By the way I have other detectors , a Garrett AT Pro and an Ace . The ground drives both these machines nuts ....and me . I have found the Surf PI build to be better than both ! in dealing with ground noise . The Pulse 2 is much the same as the Surf in respect of noise but personally I prefer using it to all my detectors . Gary ... if you ever come up with a discriminating circuit that's not too complicated and can be incorporated into the P2 please let me be the first to know... hehe . I'm currently working on getting correct induction on a DD coil for the TGSL build . Not as easy as I thought , when the coils are restrained the induction increases too far even though I allow for the increase .( going through heaps of wire )Theres no going back after super glue is applied .So its trial and error for me .Even though coil inductance is off the machine still works ok . I just want the best build I can realize for my knowledge and skill level. I will start recording my finds ...as in what metal , depth found at , size, weight and mineralization levels .Thanks for your interest RM . Cheers ,Dave .
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Post by Gary Lecomte on Oct 31, 2016 6:40:20 GMT -8
Dave, You Don't have my Pulse-2. Not that it makes much Difference, but You have the Pulse-1.
Discrimination on PI Detectors is Not really Possible.
And I Think your confused between the Terms of Discrimination, Noise Cancelling and Ground Effects.
On My PI Detector, Converting it to use Dual Cancelling Coils, Might Help eliminate some of the Mineralization Problem.
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dave
Junior Member
Posts: 56
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Post by dave on Oct 31, 2016 12:26:21 GMT -8
Thanks Gary , for the clarification . I can still convert the board to pulse II though , cant I ? I should probably get another board from you . On the ground noise issue what I said about disc. I was talking in general terms , not the best way to get an idea across , I'll try to be more specific . And yes ,DD coils . When I finally get the process right to get accurate inductance I will make several sizes to test . Thanks for the input ,cheers Dave.
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Post by Gary Lecomte on Oct 31, 2016 19:17:34 GMT -8
Dave, The Pulse-2 is NOT Better. It just has 3 additional Controls to control Pulse Width, Dead Time and Receive Time. And If they are Not Set Correctly, You will get VERY BAD RESULTS.
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dave
Junior Member
Posts: 56
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Post by dave on Nov 4, 2016 21:26:36 GMT -8
Thanks Gary , I still might one day like to build that kit and also the dual frequency model just for kicks. Cheers , Dave.
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Post by Gary Lecomte on Nov 5, 2016 7:54:31 GMT -8
When I finally get the process right to get accurate inductance I will make several sizes to test . Thanks for the input ,cheers Dave. The ONLY Accurate Process to determine Inductance is using an inductance Meter. But Coil Inductance for Pulse Induction are generally Not very Critical. And Time is running Out to BUY kits from me. I am Not updating my Parts Stock any more by Buying More.
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