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Old 20th May 2009, 07:28 AM   #91
Phil47 is offline Phil47  France
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Hi Wachara and all,

I don't have favorite. It all sounds good.

Photo of an epoxy frame and an electrode plate made with "piano wires" :

Click the image to open in full size.
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Old 20th May 2009, 02:32 PM   #92
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Hi Philippe,

Nice work. It is just beautiful.

I wonder how you make the wires to stay that way.

Do you think if I use my CNC to machine a PCB similar to your pattern, will it be good?

Thanks for sharing.

Wachara C.
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Old 20th May 2009, 05:15 PM   #93
vaughn is offline vaughn  United States
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If I had to guess I would say that stator is milled from a sheet
of material then electroplated, not from piano wires. Since Philippe says
it is from piano wires I assume it must be. I suppose you could braze them(hard silver
solder used in jewelry making) but this would heat up the piano wire to a point that it
would change it's properties. I think they could also be wound around a stator plate like
a bobbin and then plated but it doesn't look like this is what has been done here.

I have begun preparing some copper and selecting some wood for building an energizer
after the design Wachara posted. I am also keeping an eye out for some nice quality ribbon
cable to construct the headphone cable out of. I am wondering which connector you guys are
using for your plug and jack connections on the headphone cable?
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Old 20th May 2009, 09:55 PM   #94
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Default Piano wires

Hi,


Maybe It should be "Like" piano wires instead of with piano wires!
Cause this looks like a flat metal plate that has been perforated with slots instead of holes.

Just my

Best regards,


Audiofanatic
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Old 21st May 2009, 04:12 AM   #95
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Here are the detail drawings of my design:

Click the image to open in full size.

Click the image to open in full size.
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Old 21st May 2009, 04:30 AM   #96
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Last night I had a chance to try the 0.9 microns mylar which I bought from the USA. Interestingly, I didn't find the diaphragm to be more efficient than the 6 microns one. Overall, the mid and high sounded about the same as the 6 microns. But the low frequency wasn't as good.

I'll try the 1.4 micron mylar tonight, and will report soon.

I also tried a can of graphite lube spray last night. The stuff was meant for lubrication on machinery. Once sprayed, it left a very thin layer of dried graphite on the surface. The graphite was dried and adhered to the membrane very well - I couldn't rub the graphite off with my fingers. I checked the resistance and I measured around 2 meg ohm. It was really easy to apply. But one thing that I didn't like it was that it left the diaphragm with very dark color. What do you guys think about this stuff?

Wachara C.
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Old 21st May 2009, 04:54 AM   #97
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Phil47

I do not intend to hijack this tread, but could you tell us about the linesource ESL-speaker which I suppose was a follow-up to the headphone design mentioned here, the article appeared in L`audiophile.

Regards JB
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Old 21st May 2009, 01:09 PM   #98
vaughn is offline vaughn  United States
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Quote:
Originally posted by chinsettawong
Last night I had a chance to try the 0.9 microns mylar which I bought from the USA. Interestingly, I didn't find the diaphragm to be more efficient than the 6 microns one. Overall, the mid and high sounded about the same as the 6 microns. But the low frequency wasn't as good.

I'll try the 1.4 micron mylar tonight, and will report soon.

I also tried a can of graphite lube spray last night. The stuff was meant for lubrication on machinery. Once sprayed, it left a very thin layer of dried graphite on the surface. The graphite was dried and adhered to the membrane very well - I couldn't rub the graphite off with my fingers. I checked the resistance and I measured around 2 meg ohm. It was really easy to apply. But one thing that I didn't like it was that it left the diaphragm with very dark color. What do you guys think about this stuff?

Wachara C.
I could personally live with the dark color if it is doing everything else right. Maybe you
could try them in a test rig and let us know how it sounds?
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Old 21st May 2009, 01:49 PM   #99
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Quote:
Originally posted by vaughn


I could personally live with the dark color if it is doing everything else right. Maybe you
could try them in a test rig and let us know how it sounds?

Hi Vaughn,

I actually applied the stuff on the 0.9 microns diaphragm and tried last night. Like I said, the sound was alright except that the low frequencies were not as good as the 6 microns one.

The picture shows how the diaphragm looks like after one pass coating of this stuff.

Click the image to open in full size.

Wachara C.
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Old 21st May 2009, 02:07 PM   #100
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As you have found out, this kind of coating works. But theoretically the higher the resistance of the coating, the lower the distortion (constant charge operation).

Some people like to use the formula (I believe first postulated by Hunt) where the minimum surface resistance is calculated by looking at the lowest frequency to be reproduced and choosing the SR such, that the voltage on the diaphragm can't change significantly within (half) a period of that signal.

For a full range speaker it is commonly recommended to use a coating with a resistance between 10E9 and 10E12 Ohms per square.

In my opinion, an ESL does indeed sound better with high SR coating even if it is not full range.

I suppose for a headphone this could be less problematic if the deflection of the diaphragm is small compared to the stator spacing.
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