Air-Core Inductor for X-over? - diyAudio
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Old 28th February 2005, 02:22 PM   #1
Baki is offline Baki  Malaysia
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Default Air-Core Inductor for X-over?

Does anyone know how to build a air core inductor for crossover network? Anyone have the easiest way? I need some guides. Thanks.
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Old 28th February 2005, 02:40 PM   #2
DonoMan is offline DonoMan  United States
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Just wind it around a small cylinder and then pull the cylinder out, I think
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Old 28th February 2005, 03:50 PM   #3
shusha is offline shusha  Croatia
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If you don't have the access to the inductivity meter there are tables and guides at the net how to wind inductor witohut one.

These spec's gives you the right number of winds for particular wire as well as diameter of cylinder. I don't have the URL but Google will find it.

On the other way, if you have inductivity meter I don't see the problem.

Just make your winds tight using lot of strength while winding.
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Old 28th February 2005, 04:08 PM   #4
sam9 is offline sam9  United States
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Do a google search for Wheeler's Formula.
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Old 28th February 2005, 09:19 PM   #5
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Get a threaded rod, attach a tube of the length and width you want for the inner part of the inductor.

Then use some disks with holes in the center to form the side walls.

Tighten everything up and attach it to a drill, attach the wire somehow, and just start drilling.

Use tie wraps at the end to hold it together.
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Old 1st March 2005, 06:34 AM   #6
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Hi,

just have a look at this online calculator:

http://www.colomar.com/Shavano/inductor_info.html
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Old 1st March 2005, 11:22 AM   #7
rabbitz is offline rabbitz  Australia
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......... or this little beauty.

http://members.optusnet.com.au/~audiosoft/inductor.exe
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Old 1st March 2005, 02:56 PM   #8
Baki is offline Baki  Malaysia
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Yes, I got it.

Originally posted by thomas997
PHP Code:
Tighten everything up and attach it to a drillattach the wire somehow, and just start drilling
Would it be speed too fast if using drill? It's a good idea. What's the way you use to attach the copper wire? Since the copper wire is laminated.
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Old 1st March 2005, 09:06 PM   #9
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Quote:
Originally posted by Baki
Yes, I got it.

Would it be speed too fast if using drill? It's a good idea. What's the way you use to attach the copper wire? Since the copper wire is laminated.
I would use a battery drill with adjustable speed. Or maybe even a dremel style one (with a switch to select speed to have an extra hand free). Might need more power if working with large gauges though.

To hold the wire you can drill a small hole in one of the disks on the side, then thread a bit of the wire through that. Or maybe there is a better way.

btw you can also use some wax paper or similar around the form so that the wire is easier to remove. Sometimes it gets stuck in place.
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