Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › My DIY electrostatic headphones
New Posts  All Forums:Forum Nav:

My DIY electrostatic headphones - Page 99

post #1471 of 1688

Hello Wachara

 

And thank you for the welcome. If the voltage swing, for a direct drive amplifier, is as high as the supply, then it goes into saturation (clipping). Normally the output stage has to stay within the linear region so as to have as little distortion as possible. While they can go rail-to-rail in theory, in practice it would be lower.

 

Still, by pure luck, I found with Google an article from TI, snaa046, which gives an example of solid-state amplifier and some numbers: for a 400V supply (class A), output has ~200Vpp and its supposed to be able to drive Stax type 1 headphones (whichever those may be, I have never had any in my hands). At any rate, that was the info I needed.

 

On the other hand, I see no series resistor to the output, so, even if the plates and stator are isolated inside the earcup, the wires might still present a problem if they somehow break (I have seen, many times, people feeling a sudden urge to get up, forgetting the headphones they were wearing, and this is just one example... :-) ). The resistor cannot carry high current since the impedance for a 50pF at 20kHz is ~63.7kOhms, so with the 200Vpp (from TI's appnote) there would be ~1.11mA RMS (thus ~78mW dissipated power). In theory, a 10kOhm resistor could be placed in series and the gains would be: no sacrificed bandwidth and protection against high-voltage signal (not to mention it would be the cheapest protection of output stage at shortcircuit).

 

Well, thank you for the answers and, if I'll have more questions, you'll know... :-)

 

 

Vlad

post #1472 of 1688
The headphone with Danish oil sure looks lovely Wachara. How I wish I'm listening to your headphone and chilling out with a beer to two biggrin.gif
post #1473 of 1688
Quote:
Originally Posted by arnaud View Post

Heineken! You deserve a better beer for such a good repainting job!
Perhaps Chinsettawong should consider employing his unique cloning skills to brew some better beer? :-)

A brewer friend of mine once told me that the live yeasts used in some of the worlds best beer can be 'harvested' from a nearly finished bottle and used to produce very high quality home-brew 'copies'.

Best beer brand EVER ( imvho.....)
http://www.beeradvocate.com/beer/profile/207/645/

On topic too! ( diy/cloning, intoxication as a hi-fi tweak! )
post #1474 of 1688
Thread Starter 
Quote:
Originally Posted by Q Mass View Post


Perhaps Chinsettawong should consider employing his unique cloning skills to brew some better beer? :-)

A brewer friend of mine once told me that the live yeasts used in some of the worlds best beer can be 'harvested' from a nearly finished bottle and used to produce very high quality home-brew 'copies'.

Best beer brand EVER ( imvho.....)
http://www.beeradvocate.com/beer/profile/207/645/
 

 

:tongue_smile: That sounds like a fun DIY project. 

post #1475 of 1688
Thread Starter 

At last, they are singing now.  :L3000:

 

 

I use just enough tension to get rid of the wrinkles on the diaphragm this time, and so far I think the phones have been pretty stable.  However, things might change when I put a headband on them.

 

Wachara C.

post #1476 of 1688
Aren't you afraid of getting dust between the stator and diaphragm?
post #1477 of 1688
Thread Starter 
Quote:
Originally Posted by davidsh View Post

Aren't you afraid of getting dust between the stator and diaphragm?

 

You probably can't see from the pictures, but I've put a dust cover on already.

 

By the way, about the noise from dust problem, the easiest way to help solve it is to paint your stators.  I always do that on all my stators.

 

 

I cover the stators with spacers and pray paint them.  I use permanent ink to cover the area where the paint misses out.  Then I chemically etch away the copper on the uncovered area.   If the paint is still in good shape after the etching process, I'll just keep it as is.  Otherwise, I might repaint the stators again.

 

If you do a good job, the copper on your stators is well insulated.  And you'll have less chance of noisy drivers.

 

Wachara C.

post #1478 of 1688
Thread Starter 

The Float number 2 is now singing.  :biggrin:

 

 

The stability is quite a bit better than the previous pair when using 0.5 mm spacers.   But I'm not sure if it's the hole in the middle or the shorter width of the spacer that helps. 

 

Anyway, the phones now have pretty good dynamic and very wide sound stage.  The low bass still rolls off a bit when compares it with my Orpheus clone.  But, it's not bad at all.

 

Wachara C.

post #1479 of 1688

Any chance this will turn commercial? 

post #1480 of 1688
Thread Starter 
Quote:
Originally Posted by Dark_wizzie View Post
 

Any chance this will turn commercial? 

 

Maybe when I'm old and retired.  :wink_face:

 

However, I highly encourage you to try to make them by yourself.  I'm sure that you'll have a lot of fun.  :bigsmile_face:

 

Wachara C.

post #1481 of 1688
I'm interested in making them myself but need help and advice.
post #1482 of 1688
Thread Starter 
Quote:
Originally Posted by gikigill View Post

I'm interested in making them myself but need help and advice.

 

We're always here to help.  :L3000:

post #1483 of 1688
The Float v2 looks super awesome. I hope I'll get to listen to it some day. Keep up the good work Wachara
post #1484 of 1688
Quote:
Originally Posted by chinsettawong View Post
 

 

Maybe when I'm old and retired.  :wink_face:

 

However, I highly encourage you to try to make them by yourself.  I'm sure that you'll have a lot of fun.  :bigsmile_face:

 

Wachara C.

You might be capable of doing something like this, but I know nothing about how to build of stuff like this. I was looking at the directions on how to assemble an Odac and I turned around and ran the other direction. :(

post #1485 of 1688
Currently on vacation but will start something when I'm back. Might have to get a few workshops to help with the parts as I have no tools or machinery.
New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › My DIY electrostatic headphones