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Old 13th March 2011, 04:23 AM   #331
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I've finished my 3 stators and double diaphragms electrostatic headphones. Here are some pictures:

The front and back stators are made of single sided 1 mm PCB. The middle stator is made of 1.5 MM double sided PCB.

Click the image to open in full size.

I use 0.5 mm plastic rings as spacers, 1 mm singe sided PCB ring for gluing the dust protective diaphragm on, and 2 mm foam rings as damper rings to eliminate the possible vibration.

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The unneeded copper on the PCB is chemically etched away. The copper side is spray painted with white and the other side with black.

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The enclosures are routed to shape similar to the dimensions of those of Stax Lambda series.

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I utilize a cable from KOSS ESP950 extension cord. Thanks Matt.

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This is with the dust protective diaphragm on.

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And this is with the 2 mm foam ring on.

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Putting everything together, this is how they look like. The ear pads are replacement pads from ESP950. Again, thanks to Matt.

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Old 13th March 2011, 04:28 AM   #332
vaughn is offline vaughn  United States
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Wow Wachara, they just keep getting better looking!
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Old 13th March 2011, 04:30 AM   #333
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There are a lot more works involved in making this pair of headphones. They sound pretty nice. However, I thought I could get a lot more bass out of them, but for some reasons I couldn't get much more. I'm thinking that I might have put too much tension on the diaphragm.

Comparing these to my older ones, I much prefer the former oval shape ones. Even though the 3 stators and double diaphragm yield better efficiency, but for the kind of music I mostly listen to, I prefer my older pair.

It's a fun project though.

Wachara C.
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Old 13th March 2011, 04:34 AM   #334
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Quote:
Originally Posted by vaughn View Post
Wow Wachara, they just keep getting better looking!
Hi Matt,

Thanks to the parts you sent me. I've utilized them all.

Wachara C.
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Old 13th March 2011, 06:36 AM   #335
pabbi1 is offline pabbi1  United States
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Wachara, what amp are you using with these?
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Old 13th March 2011, 08:11 AM   #336
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Hi Pabbi1,

The amp I am using is yours truly, eXStatA Hybrid.

Wachara C.
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Old 13th March 2011, 08:45 AM   #337
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Truly awesome, Wachara!

How are they configured, difficult to see on pictures, outer stators to ground or...?

Again, I'm utterly impressed!
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Old 13th March 2011, 02:06 PM   #338
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Hi JonasKarud,

The bias voltage goes to the center wire which is solder to a copper adhesive tape that I taped it from the back side to the front of the middle stator. This gives bias voltage to both diaphragms

The left wire is connected to the back stator and top side of middle stator. The right wire is connected to the top stator and back side of the middle stator. This is like putting two complete sets of ESL in series of one another.

Click the image to open in full size.

I also make a connector that is compatible with a Stax Pro series.

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Wachara C.
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Old 13th March 2011, 03:31 PM   #339
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Okey, Wachara.

This means that you will have two opposite voltage swings on each side of the double sided middle stator.

There's a very high capacitance between the two copper layers of the middle stator , which will drain the drive transformer/transistors/tubes on (especially high frequency) power.

As I see it, You are much better of with one membrane with positive bias and one with negative bias.
The two outer stators are then connected to ground, and both the layers on the middle stator gets the signal.
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Old 13th March 2011, 04:09 PM   #340
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Hi JonasKarud,

That's a very interesting idea. Do you mean to say that I should try making the two diaphragms work only half of the signal - one plus signal and one negative signal?
Doing so will require 5 wires. It's something that I can't do it right now.

Thanks for sharing the idea. I will try to source the wires and try later.

Wachara C.
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