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Old 6th February 2003, 07:40 PM   #1
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Default My DIY planar speaker!

I have some pics up on my website showing my DIY planar speaker.

www.purifiedaudio.bravepages.com/speaker.htm

The sound is much better than I thought it would be. The technology is similar to a Maggie.

I was shooting for Freq Resp of 200 to 10K with decent sensitivity and impedance.

The system is 70 to 12K, 6 ohms, ~80dB @ 1W. It's been a fun project, so far. Cost is under $40 for this unit.

I would like to hear any comments or suggestions.

Matt
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Old 6th February 2003, 08:20 PM   #2
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How exactly does it work? I'm guessing the magnetic field around wires repels them, producing sound? (Railgun effect, if you will ) Wouldn't that require a DC bias..?..

Tim
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Old 6th February 2003, 08:39 PM   #3
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Default how it works

The magnets and wire are arranged as below:


N= North pole of magnet facing you
S= South pole of maginet facing you
U = wire going up
D = wire going down


N U S D N
N U S D N
N U S D N
N U S D N
N U S D N
N U S D N
BOTTOM

The wire runs up from the bottom between the N (on the left) and S (middle) columns, then arcs over to the next column and goes down between the S (middle) and N (on the right).

(There are more columns than this, but this is just for illustration.)

The clear membrane has the wires attached in the manner described (poorly) above. The current through the wire makes a magnetic field. This magnetic field interacts with the stationary magents. The attraction and repulsion of these two Magnetic fields vibrates the wires, which move the membrane.

Hope this helps,

Matt
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Old 6th February 2003, 09:48 PM   #4
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I take it the membrane (diaphragm) is connected to the wires, and since the wire doubles back on itself, and the static magnetic field is similarly flipped, so the wire, given a direction of current, is deflected in the same direction across its length.
Nice bit of magnetophysics going on

Tim
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Old 9th February 2003, 07:24 PM   #5
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You're correct, Tim.
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Old 1st July 2010, 09:29 AM   #6
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Default Planars

Nothing has been done since?

I am curious..
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