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Offline Bandit1611Topic starter
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« on: September 20, 2014, 09:36:20 am »
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Hi all, 

I would like to build my own VLF/balance induction detector.  i wanted to know if you have any suggestions on a do it yourself metal detector system. 

So far all i have found is stuff from the early 80's with outdated components.  primarily the ETI1500 and Magnum

Thank you for the input

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« Reply #1 on: September 20, 2014, 09:43:13 am »
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  In our down load section you will find some to play with.  Have a look within this Board and you will find stuff to look at.

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Marked as best answer by Bandit1611 September 22, 2014, 11:48:17 am
Offline xavier
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« Reply #2 on: September 20, 2014, 09:44:18 am »
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There are loads of schematics out there, the problem is to find one that's worthy of being build. The biggest problem with schematics that you find on the net is that some fool decided to change thing on it, remove components, change component values and so on to supposedly make it more efficient, better depth is just about always the culprit. Keep posting till you have the amount of post's required to download some schematics from our download area. There you will find PI and VLF detectors.     

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« Reply #3 on: September 20, 2014, 09:54:48 am »
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So i have looked through the ones on the Downloads.  is there one that is worth really building?

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« Reply #4 on: September 20, 2014, 10:05:52 am »
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 I don't know your electronics skills or back ground but you may want to have a look at these.   This guys kits are better then fare priced and All Proven , Working detector schematics.  In the Kit you get a Professional PCB, All Parts, Even knobs and Pots.

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http://www.silverdog.co.uk/shop/
   You need to make or come up with a Coil.

  Never heard of a Complaint on these kits.

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« Reply #5 on: September 20, 2014, 11:02:45 am »
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No matter what detector you are going to build you will need to have some tool like a scope and an inductance meter, for the scope you can use a PC scope that you can download and the inductance meter you can build your self, these will become a must have at some point. The kit is a good way to go and unless you have a good electronic background it's the best way to go or you will be hitting your hear against a wall. You should tell us a bit more about your self (This is why we have the new members introduction board) that way we can point you in the right direction.

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« Reply #6 on: September 20, 2014, 11:34:40 am »
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Very Good point,

I am a Mechanical Engineer,  I can do soldering and building of circuits pretty well.  never made my own PCB, I am new to metal detecting and since i like tinkering i thought i should build my own and explore. 

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« Reply #7 on: September 20, 2014, 01:57:58 pm »
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OK so now we know who we are dealing with and by the way welcome to thunting.com. Mechanical engineering is one of my big love although I'm not an engineer, I started to study engineering but due to problems gave it up and went to work (still sorry that I did that). One of the working detectors that I have build with success is the TGSL (VLF) so I would recommend it. If you are going to build it I will be able to assist you with some good pointers, for example a lot of people have a problem with the -5V in the circuit because there detector coil is not correct. The neg 5V works on the frequency of the machine and being an LC circuit is the coil is not correct the frequency will be out making the neg 5V another voltage like neg 6.5V One question that comes to mind is do you have any electronics test equipment?   

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« Reply #8 on: September 20, 2014, 07:27:43 pm »
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Hi Xavier

Yeah engineering is pretty cool it is very rewarding in my field.  Thank you for being so willing to help a beginner such as i and that you are willing to provide your expertise.

As for the TGSL system,  do you know where i can find the schematics, BOM, and build instructions for this?  and do you have notes on how to correct the voltage issue you mentioned?

I was wondering if the TGSL would also work with off the shelf coil?  or would i need to also build my own, which i have no issues with either.

To answer you questions about test equipment, i only have a multimeter system,  i was thinking of buying the hookups to turn the computer into an oscilloscope or even the kits to build my own.

Thank you, George

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« Reply #9 on: September 21, 2014, 11:28:46 am »
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Helping members with their project and with metal detecting in general is what this forum is all about so no need to thank me  Smiley

The problem with the -5V is the coil, let me explain. The way that this detectors frequency works is with an inductor (the coil ) and capacitor, this is known as an LC circuit, because the -5V is dependent on the frequency of this LC circuit if the coil is not wound with the correct inductance the frequency will not be correct thus affecting the -5V and making it another voltage, I will explain all this to you in much greater detail once you get started.

You will need to build an inductance meter this will be a good way for you to get started with electronics.
Here is the link.
 

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You do not need to buy a scope but if you can all the better rather than building it your self (calibration is the issue)
Here is a link for a PC scope

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http://www.zeitnitz.eu/scope_en
 

I have been using this sound card scope for a long time, I compared it to my real scope and the accuracy was surprisingly good. Making a coil will not be an issue for you I will send you a link to a tutorial I just have to find it first.


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« Last Edit: September 21, 2014, 12:52:40 pm by xavier »
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