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Offline geminis74
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« Reply #160 on: January 29, 2011, 03:08:17 pm »
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test here for information:

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http://fandy.vov.ru/Chance.htm



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Offline ppodg
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« Reply #161 on: January 29, 2011, 03:14:58 pm »
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Thx, this one works ok.

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ppodg

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« Reply #162 on: January 29, 2011, 05:18:43 pm »
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Quote:Posted by ppodg
Hi,

Does anybody know what's happened to Andy's homepage?
Trying to enter

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results in "entry prohibited" info.

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Try this:

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http://www.fandy.vov.ru/


and look at forum where Chance discussed:

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http://www.md4u.ru/forum/viewtopic.php?f=5&t=3033


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« Last Edit: January 29, 2011, 05:21:28 pm by WM6 »
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Offline ppodg
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« Reply #163 on: January 29, 2011, 05:35:58 pm »
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Thx, I've allready seen two russian language fora (including one You mentioned). However I've found very little info about practical results of using this detector - even air-tests are lacking, though he project is over one year old...

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« Reply #164 on: January 30, 2011, 11:54:17 am »
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I've looked everywhere. i see a lot of dimensions but....What is the wire gauge and length of wire needed for the Chance coil.

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« Reply #165 on: January 30, 2011, 12:33:58 pm »
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Well... calculating the length is an elementary school level challenge...
Typical 0,6..0,9mm wire should be OK.

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Offline GoldDigger1950
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« Reply #166 on: January 30, 2011, 02:49:53 pm »
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Quote:Posted by ppodg
Well... calculating the length is an elementary school level challenge...
Typical 0,6..0,9mm wire should be OK.

Regards,
ppodg

The calculations are simple enough but finding the right formula is not. If you are going to try to be helpful, you need to do much better than this.

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« Reply #167 on: January 30, 2011, 03:16:45 pm »
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Good heavens!
The perimeter of the main circle times number of circles!!!
Have you ever heard of wiki or goooogle???



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Offline GoldDigger1950
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« Reply #168 on: January 30, 2011, 03:31:43 pm »
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Quote:Posted by ppodg
Good heavens!
The perimeter of the main circle times number of circles!!!
Have you ever heard of wiki or goooogle???


Good heavens, indeed. Do you realize who you are addressing here? I personally do not need advice on coils. I suggest you put on your best hat and learn how to instruct others on WHY you suggest something rather than try to admonish them about search engines. Try instructing your fellow DIY types instead of just thrusting information out there.

One thing that everyone, including you, seems to be missing in these long, involved technical threads is that from a design standpoint, the most and ONLY important issue for developing a coil that works is the coil INDUCTANCE and not the number of windings, resistance or other odd notional parameter. The ONLY issue is INDUCTANCE.

Now be a good lad and go search for an open air coil inductance calculator and get back to me with your new coil design. That's your homework. There will be a test in the morning.

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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!

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« Reply #169 on: January 30, 2011, 04:25:25 pm »
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OK.
Let's start it all over again.
Our friend has found the photo with all necessary data, probably this one: coil_cpi2.jpg
and wants to know the wire length!!!
Diameter - no problem, but everyone ought to remember p=2*pi*r = 2*pi*d where pi=3,14...
This is a somehow unusual detector and some 'engineering' knowledge is usefull.

I don't agree with you about the coil parameters. For the detector itself both inductance and resistance are important, because of the coil time constant (TC=L/R). For the owner diameter is importan, because of the range (inversely proportional to small target sensitivity). However for this specific detector ALL THESE PARAMETES CAN BE VERY IMPORANT. Just learn how it works Smiley .

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