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Old 8th November 2008, 03:55 AM   #21
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I tested a 0.4 mm spacer with food wrap plastic as diaphragm. I have to say that I am now very confused. I can't get any sound at all at 600V, 900V or even 1200V. I check and check for any mistake that I might have done and I couldn't find any.

My configuration now is 1mm stator, 0.4mm spacer, diaphragm, 0.4mm spacer, and 1mm stator. I coated the diaphragm with graphite powder this time.

Is it possible that the diaphragm was suck to one side? How can you tell if that is the case?



Wachara C.
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Old 8th November 2008, 02:49 PM   #22
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or, there was no contact between your bias supply and the diaphragm?

you could try holding it up against a light bulb. if you have the correct angle you can see the diaphragm, maybe this works?
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Old 10th November 2008, 04:57 PM   #23
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Atarashi,

It's all my own fault. My conductive material doesn't contact with the diaphragm very well and therefore no electricity goes to the diaphragm. I also have a problem with my 0.4 mm and 0.5 mm spacer. I have tried a few type of glues and they don't stick to the diaphragm well. I now go back to my original spacer which is 1 mm thick and I am using around 1200V as bias voltage.

I've just found out also that I had a mismatch of impedances between the output of my amplifier and the input of my headphone. I now use 4 ohm output tap from my 2A3SE to drive the headphone and it is now singing beautifully.

I am still searching for a thinner material to use as spacer and also a thinner mylar. But as for now, I'm happy.

Wachara C.
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Old 11th November 2008, 05:47 AM   #24
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I tried with lower volatges. At 900V, using a 2A3SE amp and a preamp, the headphone sounds OK. But with 600V, the sound is a little too soft.
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Old 11th November 2008, 07:32 AM   #25
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Well, good to hear that you make progress!

try to find a thinner diaphragm, and spacers in the 0.5 - 0.6 mm region, and with around 600V bias and either a nice step-up or (better?) a direct drive amp you will see what is really possible with electrostatic headphones...
(hint: a lot!)

so, good luck and enjoy your headphones!
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Old 11th November 2008, 12:41 PM   #26
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Atarashi,

Thanks for all your help. I have just tried the headphone with my 6528SE amp and my pre amp, and it sounds even better. I can't wait to build a headphone amp for it.

Yes, I will try to source the spacer and diaphragm material. Now that I know what I am doing, I might build a pair of speakers.

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Old 22nd April 2009, 06:45 AM   #27
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Well, I few months have passed, and I have finished making two models of ES headphone. I just want to post some pictures here and to thank you all for helping me making this project a success.

Wachara C
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Old 22nd April 2009, 06:49 AM   #28
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For my 2nd version, I made the stator and diaphragm into an oval shape. The size is 8x12 cm.
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Old 22nd April 2009, 06:52 AM   #29
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I also made an amplifier to drive the headphone. It sounds wonderful. Actually it sounds far better than any other headphones that I have.
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Old 22nd April 2009, 06:58 AM   #30
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Here it is with the cushions on. The diaphragm that I am using now is 6 microns mylar. The bass goes down a lot lower than 11 microns food wrap. I wonder if I change to something even thinner, will the low frequency response be even better?
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