northwest Spiral wound coils?
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Spiral wound coils? 0 Members and 1 Guest are viewing this topic. « previous next »
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IBGold
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« Reply #20 on: Sunday March 20 2016 16:41:17 AEDT PM »

OK just to put something into the mix below is my latest spiral wound coil the idea came from Bugwhiskers and on preliminary testing is great but yet to test it on the goldfields I today finished putting it into a housing so will be testing it in the field in two or three weeks put here so the design is copyright.

Regards, Ian. happy face


* Trumphet 001a.jpg (116.58 KB, 1152x864 - viewed 122 times.)
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Regards, Ian.
6666
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« Reply #21 on: Sunday March 20 2016 20:25:50 AEDT PM »

  
Hi 6666,

That wouldn't work as the two electromotive forces would have a tendency to cancel each other out

Just like magnets they are more powerful one way than the other, the largest flat surface has the most pull

By winding a circle one way then counter winding in the opposing plane just won't work to their advantage

Cheers, Ron

Yes you would imagine that the 2 winds would produce odd lines of force.
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6666
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« Reply #22 on: Sunday March 20 2016 20:28:27 AEDT PM »

  
OK just to put something into the mix below is my latest spiral wound coil the idea came from Bugwhiskers and on preliminary testing is great but yet to test it on the goldfields I today finished putting it into a housing so will be testing it in the field in two or three weeks put here so the design is copyright.

Regards, Ian. happy face

Thanks for the picture, it sort of looks 3d, is it a stacked winding ?
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WM6
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« Reply #23 on: Monday March 21 2016 05:24:17 AEDT AM »

Hi Ron

Agree, if two winding's  are counter wound.

In case that both winding's are wound in same direction (no matter if one is plain wound and another one as spiral over first one) effect will be added no subtracted.

I am only not sure about self-shielding properties of such solution. Will try.
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authere
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« Reply #24 on: Monday March 21 2016 11:14:32 AEDT AM »

Hi Bugsy, Ian,

Well, that stopped me in my tracks, spiral wound with the shape of a wing profile and shielding built into the mould underneath with fine wire

Don't see the reason for doing that, but if it works who cares....good job Ian

The new Elite camo's from Coiltek which I own have a lot of extra weight in them or at least the 14" coil does, I don't see where it comes from

Cheers, Ron
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techo_bob
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« Reply #25 on: Monday March 21 2016 14:21:29 AEDT PM »

Hi Ron

I believe the extra weight would be, the extra No of turns required to get the same (correct inductance)
of the coil. being spiral wound.. This also contributes to the added sensitivity of this design.

Bob..
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IBGold
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« Reply #26 on: Monday March 21 2016 16:27:37 AEDT PM »

Hi Ron,

The shape is the shape of the mouth of a trumpet so we call it a trumpet coil it is spiral wound with both vertical and horizontal surfaces to the windings this one has even windings on both planes and no foam formers just air between the coil and the shielding which is on the internal surfaces of the housing self resonance completed is 770 KHz this one is using bifilar wound coil wire  but I need to find something better as it  has too much capacitance any ideas Techno Bob self resonance with out the cable is 1260 KHz and the housing/shielding only makes a 15KHz difference .

Ron what you are seeing is the bottom of the coil those wires are the coil the old Woody's wire 32/.2 tinned wire it was all I had left.

Regards, Ian. happy face
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Regards, Ian.
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Spiral wound coils? « previous next »
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