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My DIY electrostatic headphones - Page 109

post #1621 of 1634
Is cement glue the same as cyanoacrylate glue ?
Edited by ondesx - 11/24/14 at 9:34pm
post #1622 of 1634
Quote:
Originally Posted by ondesx View Post

It seems that the tension of the Mylar must be the same for both cellls (i. e. left and right), otherwise this mismatch will result in an alteration of the soundstage and the stereo.

How do you can keep a constant tension for all cells ?

chinsettawong has a few pictures here that show how to get around this problem for a single pair of drivers.  Simply stretch your Mylar, put cement on the 2 spacers that will hold the diaphragm (1 per channel), and drop them both onto the stretched Mylar.  This will ensure both resulting diaphragms have the same amount of tension.

post #1623 of 1634

Additional question : how much is enough for the tension of the diaphragm and how to perform this perfect tension ?

post #1624 of 1634
Thread Starter 
Trials and errors, my friend. smily_headphones1.gif
post #1625 of 1634
Quote:
Originally Posted by chinsettawong View Post

Trials and errors, my friend. smily_headphones1.gif

And what about the method ?

post #1626 of 1634
Quote:
Originally Posted by ondesx View Post

And what about the method ?
The method is all about trial and error... Please take some time to read the thread from the beginning, it might help a lot. Maybe you will even get answers to questions that you don't have now, but will arise later on.
post #1627 of 1634
Quote:
Originally Posted by AManAnd88Keys View Post


Please take some time to read the thread from the beginning, it might help a lot. Maybe you will even get answers to questions that you don't have now, but will arise later on.

I already read the 100+ pages, but I don't remember that anyone gave a quantified method for the diaphragm tension. I mean considering the polarizing high voltage, the distance D/S, the thickness of the Mylar, the quality of the coating, etc.

 

Another important question seems not be answered until now. To protect the diaphragm from dust and dirt, some authors use a Mylar (not tensioned this time) at the outside of the stators.

 

Does someone think that this film may impair the audio quality of the cell ? If not, is it possible to install this "protection" at the inside face of the stators instead?

 

Thanks.


Edited by ondesx - Yesterday at 11:05 am
post #1628 of 1634

Hi there ondesx... do check out the thread again. I remember the answers to your questions already present in this thread.

post #1629 of 1634

Creative thing with the pipes.. mr urlgr-A

post #1630 of 1634
Quote:
Originally Posted by chinsettawong View Post
 

I just want to show you guys just how much weight you have to pull on the diaphragm.  When I tried to glue my diaphragm last week, this was what I did.

 

 

The Mylar I used was 3 microns.  I used a total of 8 bottles each with 650 ml.  That's about 650 grams on each bottle.  Still the stretch was barely enough.  If I were to do it again, I would probably increase the weight on each bottle to 800 -1,000 grams.

 

Wachara C. 

post #1631 of 1634
Thread Starter 
Quote:
Originally Posted by ondesx View Post
 

I already read the 100+ pages, but I don't remember that anyone gave a quantified method for the diaphragm tension. I mean considering the polarizing high voltage, the distance D/S, the thickness of the Mylar, the quality of the coating, etc.

 

Another important question seems not be answered until now. To protect the diaphragm from dust and dirt, some authors use a Mylar (not tensioned this time) at the outside of the stators.

 

Does someone think that this film may impair the audio quality of the cell ? If not, is it possible to install this "protection" at the inside face of the stators instead?

 

Thanks.


Hi ondesx,

 

I think you should try to understand the basic principle of all the components that make up an electrostatic headphone driver.  The dust cover is just there to protect the driver against dust and sweat.  If you don't want to put it on, it fine too.  To my ears, if the dust covers are not stretch tight, they don't affect the sound.

 

Frankly, I've done all my works based on trials and errors.  I don't have any quantified method.  Perhaps it woud help if you can do your own experiment and share your findings with us.

 

Wachara C.

post #1632 of 1634
Quote:

Originally Posted by chinsettawong View Post

 

The dust cover is just there to protect the driver against dust and sweat.  If you don't want to put it on, it fine too.  To my ears, if the dust covers are not stretch tight, they don't affect the sound.

 

Wachara C.

Hello Wachara,

 

Thank you for the input.

 

For the tension jig, I made some trials with a 12" cycle inner tube on a cardboard cylinder similar to the one shown on your picture (see the enclosed picture). The issue is that the pressure used isn't always the same and also depends on several parameters.

I should try with some fishing sinkers instead of the tube, since they have a more precise value and are more easier to link to the pliers attached to the Mylar.

 

I'll report the result of this try asap.

 

As far as the dust cover, do you think that using it at the inside face of the stators should be an issue ? Or it's better to place it on the outside face ?

One additional advantage if that cover is in between the diaphragm and the stator, is that it will act as an electrical insulator (i. e. no arcing even the stator isn't insulated itself ).

The only unknown for me in this case, is the possible interaction between this dust cover and the diaphragm...

 

Thank you again for your very invaluable help.

 


Edited by ondesx - Today at 2:29 am
post #1633 of 1634
Thread Starter 
Quote:
Originally Posted by ondesx View Post
 

Hello Wachara,

 

Thank you for the input.

 

For the tension jig, I made some trials with a 12" cycle inner tube on a cardboard cylinder similar to the one shown on your picture (see the enclosed picture). The issue is that the pressure used isn't always the same and also depends on several parameters.

I should try with some fishing sinkers instead of the tube, since they have a more precise value and are more easier to link to the pliers attached to the Mylar.

 

I'll report the result of this try asap.

 

As far as the dust cover, do you think that using it at the inside face of the stators should be an issue ? Or it's better to place it on the outside face ?

One additional advantage in this latter case is that the film will act as an electrical insulator between the stator and the diaphragm.

The only unknown for me in this case, is the possible interaction between this dust cover and the diaphragm itself...

 

Thank you again for your very invaluable help.

 

 

I've posted it somewhere in the thread that using the inner tyre tensioner, you would easily put too much pressure on the diaphragm.  You just have to try and see how tight the diaphragm is good for you. 

 

As for dust cover, like I've told you, it's there to protect dust.  I'm sure you can put it anywhere you like as long as it serves its purpose.  I encourage you to try different configurations and let us know how you like best.

 

Since you have everything already, just do it.  You'll see everything more clearly once you've got your hands on the real thing.

 

Wachara C.

post #1634 of 1634
Quote:
Originally Posted by chinsettawong View Post


Since you have everything already, just do it.  You'll see everything more clearly once you've got your hands on the real thing.

Wachara C.

Yes I'm very close to assemble all the pieces of the puzzle...

It remains a few details on the methodology, since I want to be able to disassemble the cell if something went wrong...

I need a couple of jigs to do this assembling in a reversible way... At least for the diaphragm with the spacers on one hand and the stators with their outer rings on the other.

I'll report soon here the result.

Thanks.
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