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Old 12th November 2010, 09:19 PM   #1
thadman is offline thadman  United States
diyAudio Member
Join Date: Dec 2005
Location: west lafayette
Default ribbon return path

How are members providing a return path for DIY ribbon drivers?

I am not satisfied with the idea of connecting wires to the top and bottom of the driver. I feel such a solution would be very susceptible to noise. In addition, this solution does not address the magnetic field generated around the return loop.

Using two ribbons (current might go up in the left ribbon and down in the right ribbon) with a symmetrical magnetic circuit (ie S - ribbon UP - N ribbon DOWN - S) would provide a return path, however the coupling between the two ribbons isn't exactly ideal. They will be attracted and repelled from each other (depending on direction of current), possibly creating a rocking motion.

Any thoughts?
"It is a profound and necessary truth that the deep things in science are not found because they are useful; they are found because it was possible to find them."
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Old 13th November 2010, 02:22 AM   #2
a.wayne is offline a.wayne  United States
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Join Date: May 2008
Location: Front Row Center
The return wires are not or should not be in the magnetic loop . The wires are best ran out side of this away from the frame 1 inch apart
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Old 13th November 2010, 02:35 AM   #3
tinitus is offline tinitus  Europe
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Join Date: Nov 2005
Originally Posted by thadman View Post

Any thoughts?
yeah, with two opposite magnet fields you wont need return wires
but its wider, and maybe not what you had in mind
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File Type: jpg ribbon mid.JPG (38.2 KB, 136 views)
File Type: jpg PLANER FINAL 2.JPG (24.2 KB, 132 views)
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Old 13th November 2010, 03:39 AM   #4
godfrey is offline godfrey  South Africa
diyAudio Member
Join Date: Nov 2009
Location: Cape Town
Originally Posted by thadman View Post
... In addition, this solution does not address the magnetic field generated around the return loop...
You could use two return wires from top to bottom - one on each side. This will reduce magnetic radiation and pickup.
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