Four leads: Ground, negative bias, positive bias and signal.
The two layers of the middle stator are connected to the output of the step up transformer. The other end of this step up winding is connected to ground.
Another benefit of this config is that the outer stators are connected to ground, eliminating the risk of electrocuted ears!
The two layers of the middle stator are connected to the output of the step up transformer. The other end of this step up winding is connected to ground.
Another benefit of this config is that the outer stators are connected to ground, eliminating the risk of electrocuted ears!
Hi JonasKarud,
I've been thinking about your idea. Since I am using a audio signal directly from a PP amp, do you think that it is possible to wire them like this - positive signal, bias voltage, ground, bias voltage, negative signal? 🙂
Wachara C.
I've been thinking about your idea. Since I am using a audio signal directly from a PP amp, do you think that it is possible to wire them like this - positive signal, bias voltage, ground, bias voltage, negative signal? 🙂
Wachara C.
Sorry, as long as the middle stator surfaces are close to each other, or in one piece, the only way is to use positive and negative bias.
Hello Wachara and everyone,
I finaly got around to start constructing some headphones.
I have already designed a direct drive amplifier for them as well using 4 fet's and two dual opamps(times two ofcourse).
I just need to get some hvfet's,although I have learned to stack the low voltage ones as well.
Mean while the transformers are standing by.
They are designed to be taken apart and reassembled easily so that different diagphram types can be swap out as well as d/s spacing adjustment by adding gaskets.
Also I will incorperate a slide plugin that will slide into the side of the frame sandwich.
I drew it up in tiny cad (a free program) and can easily change the shape and size of diagphram and just cut some new spacers (I just relised that my thinnest material is not wide enough by about an 1/8",oops!).
I have been thinking about using the shape of an egg for the diagphram area aswell.
Right now I am contemplating on a stator design as I have several options and finishing up the connector patterns. jer
I finaly got around to start constructing some headphones.
I have already designed a direct drive amplifier for them as well using 4 fet's and two dual opamps(times two ofcourse).
I just need to get some hvfet's,although I have learned to stack the low voltage ones as well.
Mean while the transformers are standing by.
They are designed to be taken apart and reassembled easily so that different diagphram types can be swap out as well as d/s spacing adjustment by adding gaskets.
Also I will incorperate a slide plugin that will slide into the side of the frame sandwich.
I drew it up in tiny cad (a free program) and can easily change the shape and size of diagphram and just cut some new spacers (I just relised that my thinnest material is not wide enough by about an 1/8",oops!).
I have been thinking about using the shape of an egg for the diagphram area aswell.
Right now I am contemplating on a stator design as I have several options and finishing up the connector patterns. jer
Attachments
Hi Geraldfryjr,
Your design looks nice. What material will you be using to make your stators? From the pictures it looks a lot like mesh wire.
Keep us posted of your progress, please. 🙂
Wachara C.
Your design looks nice. What material will you be using to make your stators? From the pictures it looks a lot like mesh wire.
Keep us posted of your progress, please. 🙂
Wachara C.
yes ,my orginal plan is to use a wire mesh.
Recently I had discovered diy anodizing and was thinking about giving it a try.
Then as I was reading through this thread it was mention that a piano wire stator works good aswell and I have lots of 1/16" tig wire.
I also have some preforated aluminium with 3/32" holes on 3/16" staggered centers that I used to build my very first panels.
In which case would probably okay.
However I was not particularly impressed with the transperency by doing a simple test of holding a peice of it next to my ear and listening to various sources at a low level.
I detected some sort of ringing and/or restriction in the sound passing through it.
This may not be an issue once mounted and coated.
This would be the easiest way to go.
But the window screen of course was undetectable.
I am currently trying to figure out how I can glue it to the support frame and keep it perfectly flat without it sticking to the construction surface while mantaining perfect alignment. jer
p.s. I never did put my mini driver back together and give it a proper testing.
That is also another option.
Recently I had discovered diy anodizing and was thinking about giving it a try.
Then as I was reading through this thread it was mention that a piano wire stator works good aswell and I have lots of 1/16" tig wire.
I also have some preforated aluminium with 3/32" holes on 3/16" staggered centers that I used to build my very first panels.
In which case would probably okay.
However I was not particularly impressed with the transperency by doing a simple test of holding a peice of it next to my ear and listening to various sources at a low level.
I detected some sort of ringing and/or restriction in the sound passing through it.
This may not be an issue once mounted and coated.
This would be the easiest way to go.
But the window screen of course was undetectable.
I am currently trying to figure out how I can glue it to the support frame and keep it perfectly flat without it sticking to the construction surface while mantaining perfect alignment. jer
p.s. I never did put my mini driver back together and give it a proper testing.
That is also another option.
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Hi Jer,
Whatever idea you have in mind, just go for it. Who knows - you might just come out with something very innovative. 🙂
Whatever idea you have in mind, just go for it. Who knows - you might just come out with something very innovative. 🙂
Wachara, how's them new double sided headphones.
you know of the guy Wille le'frebee or something don't you .
Sorry my french is Realy bad . jer
you know of the guy Wille le'frebee or something don't you .
Sorry my french is Realy bad . jer
Hi Jer,
To tell you the truth, I listened to them for a week and I decided to take out the middle stators. Now they are just normal electrostatic headphones. But, they sound better this way. I'll try in the future what JonasKarud suggested.
No, sorry. I don't know anybody by that name.
Wachara C.
To tell you the truth, I listened to them for a week and I decided to take out the middle stators. Now they are just normal electrostatic headphones. But, they sound better this way. I'll try in the future what JonasKarud suggested.
No, sorry. I don't know anybody by that name.
Wachara C.
There was an article on The Audio Circuit (not sure if it is still there) that he did on building an esl panel and headphones using the double diagphram method. jer
I found it, although I am not sure if articles are complete.
I have the original version that I printed off somewhere as it had pictures as well. jer
Do It Yourself - Electrostatic Speakers - Project: Central stator ESL by Willy Lefebvre
Do It Yourself - Electrostatic Headphones - Project: Electrostatic headphone by Willy Lefebvre
I have the original version that I printed off somewhere as it had pictures as well. jer
Do It Yourself - Electrostatic Speakers - Project: Central stator ESL by Willy Lefebvre
Do It Yourself - Electrostatic Headphones - Project: Electrostatic headphone by Willy Lefebvre
Hi Jer,
Thanks for your link. I've actually read it before. Now that I reread it again, it is indeed a very interesting design. I'll try it out. 🙂
Wachara C.
Thanks for your link. I've actually read it before. Now that I reread it again, it is indeed a very interesting design. I'll try it out. 🙂
Wachara C.
Hi Jer,
No, what I did was quite different. I made 3 stators. The one in the middle was made from a double sided PCB. The configuration was similar to having 2 sets of ESL placing series to one another. My thought was that having 2 sets, the efficiency would be better than one. I thought that I could hear deeper and more powerful bass. But, somehow, it didn't turn out the way I thought. Perhaps, it's something I did wrong. I'm not sure. Maybe, I'll revisit this idea again in the future.
Wachara C.
No, what I did was quite different. I made 3 stators. The one in the middle was made from a double sided PCB. The configuration was similar to having 2 sets of ESL placing series to one another. My thought was that having 2 sets, the efficiency would be better than one. I thought that I could hear deeper and more powerful bass. But, somehow, it didn't turn out the way I thought. Perhaps, it's something I did wrong. I'm not sure. Maybe, I'll revisit this idea again in the future.
Wachara C.
Understood. I tried wiring two panels in series and it worked.
But this method cut the voltgaes in half that where being applied to the stators, thus, reducing the efficiency.
But this method cut the voltgaes in half that where being applied to the stators, thus, reducing the efficiency.
Hi everyone
I found this thread yesterday and find it very interesting. I am going to ask a question that is not exactly related to headphones - so I apoligize if I am out of line. The headphones appear to be similar in size to small compression drivers used on horn loudspeakers. So, does anyone know if these types of headphone drivers would work on a horn? Does anybody have a horn that they could mount their headphone to as a test. I will keep this short and appreciate any responses. If there is any interest in this topic, I could start a seperate thread.
Dan
I found this thread yesterday and find it very interesting. I am going to ask a question that is not exactly related to headphones - so I apoligize if I am out of line. The headphones appear to be similar in size to small compression drivers used on horn loudspeakers. So, does anyone know if these types of headphone drivers would work on a horn? Does anybody have a horn that they could mount their headphone to as a test. I will keep this short and appreciate any responses. If there is any interest in this topic, I could start a seperate thread.
Dan
Hi Dan,
Electrostatic headphones work exactly like large electrostatic loudspeakers. So, if you want to make them work as loudspeakers, all you have to do is increase the bias voltage and feed them a higher audio signal. I'm sure they will work. However, with the size being so small, you won't get very loud sound.
Wachara C.
Electrostatic headphones work exactly like large electrostatic loudspeakers. So, if you want to make them work as loudspeakers, all you have to do is increase the bias voltage and feed them a higher audio signal. I'm sure they will work. However, with the size being so small, you won't get very loud sound.
Wachara C.
Hi Dan there have been a few discussions about horn loading an esl.
Usualy someone ends up talking one out of it.
I, myself would like to try it with my small panels.
There is a guy currently horn loading his AMT's which are the perfect size for my small panels with a 3.25" X 9.75" diagpram.
They get extremely loud as is, A horn would be interesting.
I have also found one project using a large size panel aswell.
I think it would be a very interesting thread indeed with lots of different opinions.
Just thought I would throw that out there for one to think about. jer
Usualy someone ends up talking one out of it.
I, myself would like to try it with my small panels.
There is a guy currently horn loading his AMT's which are the perfect size for my small panels with a 3.25" X 9.75" diagpram.
They get extremely loud as is, A horn would be interesting.
I have also found one project using a large size panel aswell.
I think it would be a very interesting thread indeed with lots of different opinions.
Just thought I would throw that out there for one to think about. jer
Talking about horn loading, do you mean placing a horn in front or behind the ESL driver? One of the big disadvantages of ESL is that it is extremely directional. By putting a horn in front of the ESL, will it help with sound dispersion?
Wachara C.
Wachara C.