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Offline der_fishermanTopic starter
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« on: July 13, 2011, 01:55:33 pm »
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Hi,

I have a question or two for you Guys (and Gals!), I am looking for a DIY Metal Detector project, where all the
needed infos are freely available on the web or similar. I don't really care if its a TR/IB/VLF or a PI as long as its a reasonably powerful one.....

I have actually found a PI detector on the web where almost all the infos needed are available online, (except for the
setup of the two Trimmer Pots).

You can see it being tested with a 1" coil on YouTube at:-

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http://www.youtube.com/watch?v=V9U6fh2qeQI#noexternalembed&feature=player_embedded


Its performance seems to be pretty good as it is starting to detect the coin at around 16" in air......more than
adequate for me. What do you think?

Its also not got a Micro Processor or PIC, with questionable support for the program, but I have nothing against
PICs provided the reuired program is also available..

Look here for some pictures, sadly the site is in Polish I believe:-

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http://svv.my1.ru/publ/1-1-0-52/



Has anyone else built the machine I have posted the links for? What was your impressions?

Can you please reply with any links you know of to proved machines that you have either built or used?

Many thanks in advance.

regards

Andy

PS I have tried several times to post today and it has not worked, also I am not allowed to download from THunting.com, can you
   help me further with regard to downloads?

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Offline GoldDigger1950
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« Reply #1 on: July 13, 2011, 02:14:23 pm »
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Quote:Posted by der_fisherman
PS I have tried several times to post today and it has not worked, also I am not allowed to download from THunting.com, can you
   help me further with regard to downloads?

Downloads are for full members only who have 25 posts or more. Keep discussing things and you'll be there soon.

Posted on: July 13, 2011, 09:57:44 PM
Judging by the schematic, PR2 adjusts your pulse width for the coil recovery time (between 12 and 30ms is typical) and P3 adjusts your volume (user preference). P1, P2 and PR1 are for adjusting your +/-5v and they are critical to proper function. They use a floating ground which is actually at +12v for the power supply circuits and earth ground for all components. Be very careful when building this device. Don't turn it on until every part is in place or you will cause a few to fail.

FYI, the PR(n) parts are Precision Resistors, or 10 turn pots. The P(n) parts are just single turn pots.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!

Offline xavier
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« Reply #2 on: July 13, 2011, 02:22:54 pm »
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Hi Der_fisherman

I had a look at the detector that you posted and from what I can tell it could be quite a fun machine to build. The only thing that I still need to figure out there is the coil diameter.

All the best
Xavier 

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So many questions so little time

Offline GoldDigger1950
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« Reply #3 on: July 13, 2011, 02:38:39 pm »
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Quote:Posted by xavier
I had a look at the detector that you posted and from what I can tell it could be quite a fun machine to build. The only thing that I still need to figure out there is the coil diameter.

Mate, you've never met a project you didn't like!

The coil can be just about any diameter as long as it is around 350uh. In PI, near enough is good enough because you really need the quiescent timing rather then the frequency precision. In the audio range, 15kh is as good as 16khz. The coil is an antenna for a relatively weak signal. More windings are normally better so very thin wire is the key.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!

Offline xavier
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« Reply #4 on: July 13, 2011, 04:09:37 pm »
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 Grin Grin Yes I guess that you are right but lets face it that detector dose look like a fun one to build and it could be done in just a few hours and not too difficult for a beginner. They say 0.5 to .65mm for the wire on this one. I think I only saw one diagram where the wire was less than .5mm but having read this post has me thinking perhaps I should make a coil using .3mm wire (or closest to) for my detector and see what gives. But wont having more wire reduce the decay time on the coil making it slower? Now I'm hijacking Der_fisherman thread (sorry mate)

All the best Xavier 

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Offline der_fishermanTopic starter
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« Reply #5 on: July 13, 2011, 05:18:39 pm »
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Firstly many thanks for the rapid response and infos.

I have the board layout and the PR pots are trimmers according to the legends. Also according to the space given them with the pads.

I will have to start posting to get my 25 posts logged!!!

Have a great days and regards

Andy

Posted on: July 13, 2011, 05:06:14 PM
You can build it any size you wish, the only knowledge you need is that the gauge must be between 0.5 - 0.65 mm and the length must be 16 meters.
The original builder has just built a normal coil, but a planar coil would be better if you have the time or energy to make it. Less capacitance.
We should stay in touch if either of us do actually build one!!
Regards
Andy

Posted on: July 13, 2011, 05:13:11 PM
Hijack all you want!
I would not personally recommend thinner wire as this will reduce the current taken and therefore the power emmitted, it could easily make your MD far less effective.
I will stay with the recommended coils (wire gauge & length) if I decide to build.
Are there any good projects here to download?
regards
Andy

Posted on: July 13, 2011, 05:16:47 PM
Has anyone here any recommendations for using any of the DIY machines here from downloads?
Thanks for any help.
regards
Andy

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« Reply #6 on: July 13, 2011, 05:38:31 pm »
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Or you could just get a kit from Silverdog in the UK! Grin

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Offline der_fishermanTopic starter
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« Reply #7 on: July 13, 2011, 06:09:50 pm »
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Looks interesting, many thanks, Andy

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Offline xavier
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« Reply #8 on: July 14, 2011, 05:23:00 am »
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Well you have your 25 posts so why not go to the download area and have a look around and if it's help that you need there's plenty of that right here on thunting.com I will have to disagree about the length that must stay 16m reason being that on a coil 300mm you will have 17 turns and on a 500mm coil 10 turns so goodbye inductance the only thing that will remain the same is the resistance and another thing that I have found is the smaller the coil the less inductance you need my large coil 400 x 400 is about 1.5mH my 280mm coil only 250uH both are used on the same machine.

All the best
Xavier 

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Offline der_fishermanTopic starter
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« Reply #9 on: July 14, 2011, 05:35:31 am »
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I have done just that today, picked out what appeals and now I am going to peruse the files that I have downloaded. I managed the 35 posts late last night, but was tired.....

Many thanks for pointing that out and if everyone is as friendly here as you are, I am going to have a great time picking your (collective) brains!

Have a great day (all of you)

Regards

Andy

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