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Old 22nd June 2014, 09:50 AM   #11
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My idea is long leads and less.
You can't make ordinary coil,s .I think you will need return leads.
Here the link:http://themaskingshop.co.uk/detail.asp?catID=1a
Bernt

Last edited by båndsei; 22nd June 2014 at 09:52 AM.
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Old 22nd June 2014, 10:36 AM   #12
solhaga is offline solhaga  Sweden
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Default No return leads

Quote:
I think you will need return leads.
Nope:
Click the image to open in full size.
Except for those at the short sides of course.
But they are only 60 mm compare to the leads in the field (400 mm).
So there will be a 15 % loss.
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Old 22nd June 2014, 06:54 PM   #13
solhaga is offline solhaga  Sweden
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Thanks for the link, Bernt.
What´s the resistance per meter for the 3 mm tape?
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Old 22nd June 2014, 06:57 PM   #14
solhaga is offline solhaga  Sweden
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Perhaps this could be made into a VCF?
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Old 22nd June 2014, 09:12 PM   #15
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3meter 3mm alutape measures 0.8 ohm. App.0,25 ohm/meter.

Bernt
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Old 23rd June 2014, 08:51 AM   #16
solhaga is offline solhaga  Sweden
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Thanks.
How about the handling, it seems to be very brittle?
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Old 23rd June 2014, 05:57 PM   #17
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I've used about 1000 meters of the 3 mm tape had no problems with the brittleness whatsoever.And I'm 76.
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HENRY
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Old 23rd June 2014, 06:01 PM   #18
solhaga is offline solhaga  Sweden
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Great news, Henry.
Then perhaps I should buy a couple of rolls then, just to be on the safe side if the 0,25 mm copper wire will not do.
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Old 25th June 2014, 09:39 PM   #19
WrineX is offline WrineX  Netherlands
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yep the maskingshop.co.uk again

used it for magnepans used the 3 mm and the 5 mm both are not britle at all
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Old 26th June 2014, 09:19 AM   #20
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by båndsei View Post
3meter 3mm alutape measures 0.8 ohm. App.0,25 ohm/meter.
The tape is 0,04 mm thick. I need an insulation kapton tape between each layer.
The kapton tape is also 0,04 mm. That's 0,08 mm a layer.

To get 8 ohms, I need 4x8 layer if 1 meter equals one layer.

So the VC will be 2,56 mm thick plus the VCF giving a grand total of 3,56 mm in a 4 mm gap. It won' t fit.
The VC will be 3 mm wide (or deep?) of course.

Using 0,25 wire I need 23 turns to get 8 ohms. If I can have 12 turns on the inside of the VCF and 12 turns on the outside, the voice coil will be 1,5 mm thick and 3 mm wide/thick.
That would fit in the 4 mm gap.

Here is my first attempt on the feasibility of making a VC with 0,25 mm wire. There's a long way to go...

Click the image to open in full size.

Click the image to open in full size.
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