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Old 13th May 2006, 05:40 AM   #1
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Default Crazy field coil thought

Has anyone investigated converting a PM speaker to field coil? Could one - as a practical matter - remove the PM from a driver and add an electromagnet in its place? Maybe using an older driver with the smaller magnets housed in U shaped frame (easier to remove than modern designs?)...

OK. I get some odd thoughts at 1:45 AM... Maybe I should go to bed.

mike
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Old 13th May 2006, 06:17 AM   #2
lndm is offline lndm  Australia
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Crazy thought number two, this is a way to introduce a potentially useful feedback option.
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Old 13th May 2006, 11:18 AM   #3
Raoul is offline Raoul  United States
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Funny, I was just talking about that very idea with a friend of mine earlier tonight. Guess it must be a hundredth monkey thing...
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Old 13th May 2006, 05:58 PM   #4
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I spent some 'thought experiment' time on this and while I think it's possible in theory, in practice it may not be the ideal way to go. Reasons
- tough to get the magnet off without wrecking the cone
- voice coil design probably should be different for a field coil unit (not an issue if you're just trying to make something work)

On the other hand, I'm not sure how else you'd go about experimenting. You either need to remove a magnet from a working speaker, OR be able to get the cone/spider out without damaging it to serve as the basis for the field coil unit. Maybe the way to go is to look for drivers that are easily disassembled - some pro units may fall into this category.
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Old 15th May 2006, 02:26 AM   #5
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Depending non the size of driver wouldnt it be easier to buy a passive radiator and make the voice coil/former since your making the field coil. Though I've had trouble finding passives any smaller then 8", a large speaker may be easier to work on at least for the initial stages...
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Old 15th May 2006, 02:53 AM   #6
lndm is offline lndm  Australia
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What about a DIY ribbon?
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Old 15th May 2006, 04:07 AM   #7
Variac is offline Variac  United States
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Peavey makes "pro" drivers with a magnet structure that can be unbolted. You can buy the metal "basket" with cone and suspension attached as a spare part. Might be an easy way to get started, but I suppose that you were thnking of using a driver that is already considered among the best. Idon't know how the Peaveys sound.
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Old 15th May 2006, 04:51 AM   #8
tom1356 is offline tom1356  United States
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Someone is doing just that...
http://www.shindolabs.com/pages/5/pa...=1112334014765
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Old 15th May 2006, 05:49 AM   #9
Variac is offline Variac  United States
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Shindo is converting a driver to field coil?

There are other companies that make field coil drivers.


I think Mike wants to make his own, no?
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Old 15th May 2006, 02:03 PM   #10
tom1356 is offline tom1356  United States
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Shindo is converting old Altec (288) and JBL (375/6) into field coils.
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