It will be like a bookshelf with each shelf having one of these drivers:
Yellow/blue part is the voice coil.
So it will only be a part of the pleat/shelf that will move.
The moving part, the membrane, will be 14 cm times 44 cm.
Every other driver will be flipped over so two of them will make a pseudo fold.
With a 10 cm spacing I reckon there will be 8 drivers in total.
The complete speaker will be 90 cm high and perhaps 70 cm wide footprint wise. The front baffle will probably be folded backwards to lower the OB cancellation frequency.
So far I have one question; is AWG30 a suitable dimension for a bass driver voice coil copper wire?
Yellow/blue part is the voice coil.
So it will only be a part of the pleat/shelf that will move.
The moving part, the membrane, will be 14 cm times 44 cm.
Every other driver will be flipped over so two of them will make a pseudo fold.
With a 10 cm spacing I reckon there will be 8 drivers in total.
The complete speaker will be 90 cm high and perhaps 70 cm wide footprint wise. The front baffle will probably be folded backwards to lower the OB cancellation frequency.
So far I have one question; is AWG30 a suitable dimension for a bass driver voice coil copper wire?
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Membrane is 0,1 mm thick and weighs about 5 grams not counting the voice coil.
I don´t think the inductance will be of any significance being that large of a coil.
When it comes the resistance, I am really at free will of choosing anything between 0,5 to 32 ohms depending on how I will wire the drivers.
I can have multiple amplifiers as well.
I aim for having about 20 turns of the coil wire though, fitting in the 2x2 mm voice coil space (blue part above).
I don´t think the inductance will be of any significance being that large of a coil.
When it comes the resistance, I am really at free will of choosing anything between 0,5 to 32 ohms depending on how I will wire the drivers.
I can have multiple amplifiers as well.
I aim for having about 20 turns of the coil wire though, fitting in the 2x2 mm voice coil space (blue part above).
AWG26 calculations
I got the suggestion of AWG26, that is a diameter of 0,4 mm and an area of 0,125 square mm.
It then be 28 turns to get a nominal resistance of 8 ohms.
Bl will then be around 21 Tm.
The wire will weigh 33 grams so it will dominate over the weights of the membrane and (hopefully) the voice coil former although my recent calculations point to 30 grams.
Power handling will of course be lousy, but I reckon I will get by anyway as the complete speaker is an pseudo bass AMT that will not require much from each driver.
I got the suggestion of AWG26, that is a diameter of 0,4 mm and an area of 0,125 square mm.
It then be 28 turns to get a nominal resistance of 8 ohms.
Bl will then be around 21 Tm.
The wire will weigh 33 grams so it will dominate over the weights of the membrane and (hopefully) the voice coil former although my recent calculations point to 30 grams.
Power handling will of course be lousy, but I reckon I will get by anyway as the complete speaker is an pseudo bass AMT that will not require much from each driver.
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Sketch of complete speaker
Side view, front is to the left:
Magnet assemblies are not shown. Sides are detached.
Front view, measures in mm:
Side view, front is to the left:
Magnet assemblies are not shown. Sides are detached.
Front view, measures in mm:
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It turned out that the value for aluminium was used instead copper, the resistance is of course somewhat below 4 ohws.
But that will probably not change the wire gauge nor the number of turns.
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This one only uses 4 magnetsystems ,length 900mm.
You can buy 3mm adhesive alu.I got a link.
Bernt
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I tried 10 mm adhesive aluminium tape, but it got too clumsy as I also had to have insulation tape between each layer of aluminium. Also, wouldn´t a 3 mm tape be very brittle and hard to handle when you are winding the coil?
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
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
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No return leads
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.
Nope:
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.
I've used about 1000 meters of the 3 mm tape had no problems with the brittleness whatsoever.And I'm 76.
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.
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.
yep the maskingshop.co.uk 🙂 again 🙂
used it for magnepans used the 3 mm and the 5 mm both are not britle at all
used it for magnepans used the 3 mm and the 5 mm both are not britle at all
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...
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