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Old 22nd April 2009, 07:30 AM   #31
Calvin is online now Calvin  Germany
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Hi,

beautiful work man
I“m going to get my coated stator sheets today. I“ll try 1.2µm film.
The improved bass response could be a matter of “creating“ a small closed chamber between membrane and head by using the cushions.
Measured freely a lot of HPs have a falling response below ~100Hz.
Its the chamber formed by the cushions, the membrane and the head that “improves“ the bass response.

jauu
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Old 22nd April 2009, 02:01 PM   #32
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Hi Calvin,

The thickness of the diaphragm really does make a difference in the low frequencies response. I started my 2nd version with 11 microns diaphragm. Only later that I was given the 6 micron mylar by a friend. With everything else stays the same, the difference in low frequencies is just too much to go unnoticed.

Where do you get the 1.5 microns material from? I really like to try.
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Old 22nd April 2009, 08:09 PM   #33
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Your stators and everything look really professional, well done! Do you have more information on that DIY CNC machine? I'd be interested to know how you build it.

You can look for very thin films for model airplanes, they often use values close to 1u film for the wings.
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Old 22nd April 2009, 08:31 PM   #34
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I haven't read all the posts so somebody may have mentioned this already but a good coating is "Aquadag". This was used in earlier Wireless World (Electronics World) DIY headphones designs and is a graphite based liquid. I owned some 20 yrs ago. Used in cathode ray tubes. Might be worth following up. Good luck.
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Old 22nd April 2009, 08:43 PM   #35
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wow, I'm impressed, they really look very nice!
i hope you have the time to enjoy your "new" headphones.

now that the headphones are working, what about the amp, direct drive or with output transformers?

Michael
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Old 23rd April 2009, 02:41 AM   #36
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Hi Arend-jan,

I have been playing with my CNC machine for the past few years. I learned a great deal from www.cnczone.com. There is a few open source plans that you show you how to build the machine yourself. If you need more info, please let me know.

Wachara C.
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Old 23rd April 2009, 02:52 AM   #37
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Hi Atarashi,

The amp directly drives the headphones. I got the circuit drawing from http://www.tubecad.com/november99/page8.html . It sounds really wonderful.

I hardwired the amp, since there are not so many components.

Wachara C.
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Old 23rd April 2009, 04:06 AM   #38
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Hi Jonathan,

I used graphite powder, and it worked very well. I also have got a can of graphite spray. It seemed to stick to mylar quite well. I haven't really given it a try though.

Wachara C.
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Old 24th April 2009, 10:28 AM   #39
SM7UYJ is offline SM7UYJ  Sweden
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Nice work!

Have you machined the "frames" for the head phones with your CNC as well ?

What material did you use?

/R
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Old 24th April 2009, 02:52 PM   #40
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Hi SM7UYJ,

Yes, I machined the frame using my CNC as well. It is only difficult when I first design it. After that, the machine does all the work for me. The material is plastic. I use 5 mm for the back cover and 10 mm for the front cover. I got the plastic sheets for free from my friend who uses it for making sign board and advertising stuffs.

I really like your ESL, and I'm going to make a pair similar to yours.

Wachara C.
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