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Old 12th September 2011, 08:57 PM   #121
iko is offline iko  Canada
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How do you end up with a certain impedance? Do you take that into the design?
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Old 13th September 2011, 10:36 PM   #122
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I use two resistors and make the speaker 3, 8, and 16 ohm, so you can use different impedances to suit your amp(s) The resistors depend on what the impedance of the membrane ends up as,depending on the size you make it. I am in the process of building a full range planar headphone using neos. Have just stripped down one of my cheap and cheerful headphones, which is just the right size, wish me luck.As I design it of the top of my head as I go along.
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Old 13th September 2011, 11:14 PM   #123
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Are you going to etch the aluminium or just cut out and lay it on the plastic? I was contemplating starting with headphones as well, just to get the hang of it.
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Old 14th September 2011, 12:01 AM   #124
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I always use aluminium tape and I cut the width with scissors and this will be easy because I won't need too much length, as it's a headphone diaphragm. Just been sorting out the magnets on my perforated sheet, fiddly little things worse than the big magnets. Trying to position them.
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Old 14th September 2011, 10:20 AM   #125
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Anatomy of a Planar Magnetic Headphone Driver - YouTube

Here's som nice footage of two the most modern planar headphone drivers.
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Old 14th September 2011, 12:11 PM   #126
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Not so good mids, it seems: How Planar Magnetic Headphones Work Page 3 | InnerFidelity
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Old 14th September 2011, 12:43 PM   #127
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Both the Hifiman HE-500 and the Audeze LCD-2 are known to have nice mids and bass.
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Old 14th September 2011, 06:19 PM   #128
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What size of magnet did Apogee used?
They sound very good for ceramics.
I might try to duplicate the 26" ribbon on the Stage and hybrid models.
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Old 16th September 2011, 04:30 PM   #129
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I've been playing around with the idea of using 3D printing and long, thin neos (3") to make arrays of ribbon drivers for headphones. (Like 4 or 5 of them side by side?) Has this been tried? I'd guess that there would be extreme problems with bass response due to sealing, but it seems to me that an open air design should be possible. Would there be problems with odd resonances between drivers?
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Old 16th September 2011, 05:14 PM   #130
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I have batted around the Idea using a conductive ink in a Printer cartridge a few years ago but the ink is too coarse and thick for your standard cartridge.
It is now being done with some of the newer technologies of today but I have yet to see a system that the average DIYer could afford.

I just had a thought that you might be able to fill a printer cartridge with some LICRON(in which I think is availible in bulk as a non-aresol product) and print the pattern and then maybe use a plating process to get the final traces.

Just a thought! Jer
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