ribbon return path

[thadman]

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?

 

[a.wayne]

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

 

[tinitus]

Any thoughts?

yeah, with two opposite magnet fields you wont need return wires
but its wider, and maybe not what you had in mind

 

[godfrey]

... 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.