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Offline xavier
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« Reply #50 on: August 18, 2014, 10:36:50 pm »
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I can't see how that would work. Could you elaborate a bit more on it.

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Offline Homefire
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« Reply #51 on: August 18, 2014, 10:58:57 pm »
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  Various targets respond longer then others.   If you had a short sample delay, the less conductive  (Magnetic)  would produce one sound  Targets with longer response would give both tones.    Ok, That's no fun.   

  Some PI's use the Sample timing circuit to generate the Audio tone.      Maybe use comparators to detect and  direct the audio to a divider   IC.   

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Offline xavier
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« Reply #52 on: August 19, 2014, 01:45:29 am »
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I get the general idea but I'm not getting the full picture in my head. Gold would have eddy currents for about 20 uS or less iron I don't even know but lets say that it was 35 to 40 uS then one could have the second receiver circuit turn on after the 20 uS but this just don't sound right in fact it don't feel right.

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« Reply #53 on: August 20, 2014, 05:52:37 am »
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hello geocash

can you please show your layout here

have no luck to register on treasure seeker something goes wrong

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« Reply #54 on: August 21, 2014, 02:29:41 pm »
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Quote:Posted by 6666
Geocash1

Interested in the spider coil you made thats on the bench in your video
any chance of a couple of close up pics please ?


Hey sorry guys, have been super busy on my site and working on my detector design and haven't had a chance to get back in here and answer.. Yes 6666 I have a few pics I can post for the spider coil. I make them using the image that's floating around and have them done on a water jet, they're just to time consuming and hard to do by hand machining. If you make some make sure and make the slots narrower, mine are all done at .250 (3 more to use), that's to wide, make them no more than .125 (1/8") slots at .250 deep that way the wires cross more perpendicular to each other, 90 degrees and stay in place tighter.

added 2 pics as attachments, they wouldn't load up any other way and also had to resize them to get them to attach. I'll post them up on my site and then send you the links if you want them larger to be more visible, just message me.



Posted on: August 21, 2014, 02:14:10 pm
Quote:Posted by homefire
  It looks like it was based on the old Sandbanks Detector by Bill Lyer.


I am truly not sure homefire, it was a schematic a member sent me from geotech so I went and found the one on there.. It seems there are about 5 different schematics that are all basically the same one with some minor changes to them but they all seem to be based from the pirate pi schematic, where it (pirate pi) came from I really don't know, I just took the base design and made it my own with my own changes and testing and was able to make a decently working unit for what it is, hec it only cost like 5 bucks to build so it was worth it for a learning tool..

I used it primarily to teach myself how the pi operates and what the parts and sections of the circuit actually do, prior to it, I had no idea, it was my first try at building a metal detector circuit....lol

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« Reply #55 on: August 21, 2014, 07:16:17 pm »
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Hi geocash

Thanks for the photos and information, much appreciated, its been reported that of you connect the outside winding wire to ground of the coil circuit,the coil has a sort of self shielding effect , have you noticed that effect ?


Tried to join that treasure seeker site but it would not let me join Huh???
it just repeatedly asks me to fill in the form.
Cheers
6666



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« Last Edit: August 21, 2014, 07:23:15 pm by 6666 »
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Offline bernte_one
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« Reply #56 on: August 22, 2014, 12:37:01 am »
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hello 6666

i had finally luck to create an account on the forum

username should not contain any special signs


problem is that no error messages appear which say what you do wrong

i have a look through shematics but found nothing new


i think i will concentrate my work on three forums 
not more

i have to remind too much usernames and paswords for now

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« Reply #57 on: August 22, 2014, 12:46:25 am »
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Hi bernte_one

Thanks for that information, I tried again this morning but no luck  Cry

Cheers.

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Offline xavier
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« Reply #58 on: August 22, 2014, 03:57:40 am »
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Hi Geoscash1

Well done that coil looks awesome can you tell me what plastic you used to make the former? 

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Offline geoscash1
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« Reply #59 on: August 22, 2014, 08:58:42 am »
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Quote:Posted by 6666
Hi bernte_one

Thanks for that information, I tried again this morning but no luck  Cry

Cheers.


6666 and bernte_one, thanks for bringing that to my attention, I didn't know it wasn't working..

We just figured out what the issue was, been working on it for 4 hours now since 4 am this morning.. the home page was cached from the day we opened the site and we had changed some of the navigation since then so the homepage for browsers was still showing the original homepage (not good), we deleted the old cached pages so now it is working. just did a couple test registrations and the forms are working correctly... what a pain in the rear trying to figure out what the issue was...... Thanks again for letting me know, its much appreciated..p.s. it doesn't matter if using special characters, it will accept whatever you want to use for a username.

Posted on: August 22, 2014, 08:52:14 am
Quote:Posted by xavier
Hi Geoscash1

Well done that coil looks awesome can you tell me what plastic you used to make the former?  


Hi Xavier,

I just use lexan, .093, you can get it at home depot or most hardware type stores. You can use just about any plastic, abs, lexan or any other... the lexan isn't as easy to cut if you do it manually or by hand, any high speed tools will cause melting and then the cleanup is a bit of a pain. but the end product is nice after cleaning and sanding the rough edges.

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« Last Edit: August 22, 2014, 09:09:44 am by geoscash1 »
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