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Old 21st March 2004, 09:04 AM   #21
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Old 22nd March 2004, 09:13 PM   #22
Variac is offline Variac  Costa Rica
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I don't understand the site, but Mu metal usually means a special alloy to protect agains magnatism. Is this aluminum on the site?

Also- could anyone make up a diagram of the magnet orientation?
Do you just line them up along each edge of the ribbon with the poles pointing at the edge of the ribbon?

Are the mags attracting each other or repulsing each other?

Brian- when are you going to make that amp?
"The geek shall inherit the earth"
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Old 23rd March 2004, 01:32 PM   #23
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Someone was describing a plastic membrane with aluminum conductive strips on it. That's a planar magnetic driver, not a ribbon, although you sometimes see it described as such in sales literature. The term ribbon has cachet in the market place, planar magnetic does not.
The magnets in a ribbon are aligned so that all the magnets on one side have their South pole aimed at the driver element. The magnets on the other side are aligned with their North pole pointing at the element. That way the flux lines travel across the element from one side to the other. Generally the magnets are mounted on a steel frame of some sort that serves as a flux return and makes the field more efficient. When current flows through the element, it develops force at a 90 degree angle to the magnetic field and the ribbon moves.
Planar magnetics, such as the Magneplanar or the old Apogees, use a different strategy.
Ceramic magnets work just fine, although the rare earth magnets are better--just more expensive.

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