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Old 18th July 2003, 10:24 PM   #1
Vikash is offline Vikash  United Kingdom
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Question Diy dynamic driver

So I've ordered my neodymium magnets to use in a midrange-size design as a learning exercise. I did a search to see what pointers I could get, but the discussions I found were a bit over my head.

My questions are of the type:
Why is the voice coil centred on the front plate instead of in the middle of the magnet?
What meterials are these plates/pole piece made of?

Are there any links explaining the basics of transducer design out there?
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Old 25th July 2003, 07:32 PM   #2
Vikash is offline Vikash  United Kingdom
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Since this kind of info seems to be relatively undocumented for access to the DIYer, I thought I'd share my ongoing journey into transducer design:

Transducer Design Diary

No laughing please.
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Old 25th July 2003, 07:33 PM   #3
Vikash is offline Vikash  United Kingdom
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Front and back plate with magnets in place.
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Old 25th July 2003, 08:11 PM   #4
ksl is offline ksl  Estonia
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respect!!!
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Old 25th July 2003, 08:37 PM   #5
Exision is offline Exision  Netherlands
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I realy like to read jour findings and conclusions in a wile
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Old 25th July 2003, 10:52 PM   #6
Beggar is offline Beggar  United Kingdom
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wow how sweet is that

Got to make me an *** roll speaker, im sure that will confuse a few people
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Old 26th July 2003, 12:07 AM   #7
Vikash is offline Vikash  United Kingdom
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I'm not getting much midrange for a midrange, but understandable so considering every part is grazing something as it moves . Getting loads of bass though.

I also added some elastic bands for suspension. I'll post a pic a bit later.
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Old 26th July 2003, 07:22 AM   #8
ksl is offline ksl  Estonia
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what kind of spider, cone, surround are you going to use. and are there any CAD-designs of your project? or is it going to be a scratch project?
i'd like to see the basket think, it's going to be interesting

are you doing any strength calculations or FEM for the basket ?
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Old 26th July 2003, 10:04 AM   #9
octopus is offline octopus  England
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You might find this helpful.

This is a great project idea, and that magnet assembly looks great already.

Quote:
Why is the voice coil centred on the front plate instead of in the middle of the magnet?
I've just whipped up an image below, I think the reason is that the pole piece is say, North, and the rest is South, I think. And the voice coil repells off the magnet flux...maybe someone could clarify
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Old 26th July 2003, 10:26 AM   #10
Vikash is offline Vikash  United Kingdom
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ksl,

Quote:
what kind of spider, cone, surround are you going to use
I don't want to think too far ahead. At the moment i'm changing and evolving my design as I learn the theory or see the need too. And in this way the affect of each change is very clear.

So as to the kind of cone and surround. No idea. I'm currently thinking about the former/voice coil. And starting to think about the spider.

I'm trying to stay away from convention in the hope of finding alternative methods with different benefits. The last idea was to use springs in place of the spider. But after realising that the goal is to reset the voice coil to its natural position infintely quick, I can see why stiff paper spiders are used and why springs may be a bad idea.

Quote:
are there any CAD-designs of your project
I used 3D Studio to design the magnet structure. But that's all so far.
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