Noob question about speaker coils.

neutron7 · 9th January 2010, 02:13 AM

I have been looking in to some coils for something (A variable electromagnet which is powered from an amplifier) anyways i am looking at the various gauges of wire and DC resistance for a certain length of wire.

Now i look at some speaker specifications, and see DC resistance of 4 or 6 ohms or whatever even on high powered woofers. This confuses me a bit because speaker coils are usually just 200 turns or so in one layer.

It seems to me that with a bigger speaker (and gauge of wire) that would give a very low resistance.

I would like to be able to make an electromagnet which looks as much like a speaker as possible to the amplifier, but the coil and magnet are both fixed, (it will be vibrating a metal part for an experimental music instrument project)

Is the wire they use more resistive than normal copper "magnet wire" ? otherwise i am not sure what could be going on.

thanks for any help you can give
Neut

godfrey · 9th January 2010, 03:01 AM

It's very thin wire. (small diameter)

Enzo · 9th January 2010, 04:36 AM

You could wind your own, or you could take apart some old relays and use their coils complete with pole pieces.

neutron7 · 9th January 2010, 06:06 AM

Quote:

Originally Posted by Enzo

You could wind your own, or you could take apart some old relays and use their coils complete with pole pieces.

thing is relays take sometimes thousands of coils to get a couple of ohms DC resistance i want to get very poweful push like a speaker.

Enzo · 9th January 2010, 07:24 PM

Well if you want power, there are shakers:

Parts-Express.com:*Aura Pro Bass Shaker | bass shaker transducer tactile transducer butt shaker seat shaker gift2009

And a lot of places sell surface transducers that "turn any surface into a speaker."

neutron7 · 9th January 2010, 08:59 PM

Heh

well i have been experimenting, and the best thing i found so far is the double coil from an old electric bell. of course i need 6 of them and cant find any more

9th January 2010, 02:13 AM	#1
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	Noob question about speaker coils. I have been looking in to some coils for something (A variable electromagnet which is powered from an amplifier) anyways i am looking at the various gauges of wire and DC resistance for a certain length of wire. Now i look at some speaker specifications, and see DC resistance of 4 or 6 ohms or whatever even on high powered woofers. This confuses me a bit because speaker coils are usually just 200 turns or so in one layer. It seems to me that with a bigger speaker (and gauge of wire) that would give a very low resistance. I would like to be able to make an electromagnet which looks as much like a speaker as possible to the amplifier, but the coil and magnet are both fixed, (it will be vibrating a metal part for an experimental music instrument project) Is the wire they use more resistive than normal copper "magnet wire" ? otherwise i am not sure what could be going on. thanks for any help you can give Neut

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9th January 2010, 03:01 AM	#2
godfrey diyAudio Member Join Date: Nov 2009 Location: Cape Town	It's very thin wire. (small diameter)

9th January 2010, 04:36 AM	#3
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	You could wind your own, or you could take apart some old relays and use their coils complete with pole pieces.

9th January 2010, 07:24 PM	#5
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Well if you want power, there are shakers: Parts-Express.com:*Aura Pro Bass Shaker \| bass shaker transducer tactile transducer butt shaker seat shaker gift2009 And a lot of places sell surface transducers that "turn any surface into a speaker."

9th January 2010, 08:59 PM	#6
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	Heh well i have been experimenting, and the best thing i found so far is the double coil from an old electric bell. of course i need 6 of them and cant find any more

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