Graphene-based ESL reported - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st April 2013, 11:56 PM   #1
Few is offline Few  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Maine, USA
Default Graphene-based ESL reported

I think this qualifies for this forum. Here's a link to a description of an electrostatic driver with a graphene diaphragm:

nanotechweb

I haven't seen any reports of sheets of graphene big enough to make room-filling sound, though.

(Here's a Wikipedia link for those new to graphene: Graphene)

Few
  Reply With Quote
Old 2nd April 2013, 12:07 AM   #2
diyAudio Member
 
Overkill Audio's Avatar
 
Join Date: Oct 2006
Default Interesting development

Well spotted Few!

A very interesting material with exciting potential.
Thanks for posting

Derek.
  Reply With Quote
Old 4th April 2013, 11:08 AM   #3
oshifis is offline oshifis  Hungary
diyAudio Member
 
Join Date: Mar 2004
Location: Budapest, Hungary
It seems suitable perhaps for capacitive pressure transducers. An electrostatic transducer that is suitable for audio should have constant charge. This material has high conductivity according to the Wikipedia article, so it would work in constant voltage mode, which is inherently non-linear.
  Reply With Quote
Old 6th April 2013, 06:37 AM   #4
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Quote:
Originally Posted by oshifis View Post
It seems suitable perhaps for capacitive pressure transducers. An electrostatic transducer that is suitable for audio should have constant charge. This material has high conductivity according to the Wikipedia article, so it would work in constant voltage mode, which is inherently non-linear.
Moves us closer to the acoustic ideal: a diaphragm as light as air.

About the constant-charge issue, wouldn't it be OK to have a large resistor in series with the diaphragm or must the diaphragm itself keep the charge from moving around on the diaphragm?

Room temperature super-conductive cone-driver voice coils are another ideal the graphene addresses.

Ben
__________________
Dennesen ESL tweets, Dayton-Wright ESL (110-3200Hz), mixed-bass Klipschorn (35-110), and giant OB using 1960's Stephens woofer (20-35); Behringer DSP. HiFi aspirations since 1956
  Reply With Quote
Old 28th November 2013, 05:16 PM   #5
diyAudio Member
 
Join Date: Oct 2008
Default Bill Gates pours cash into graphene condoms

Quote:
Originally Posted by Few View Post
I think this qualifies for this forum. Here's a link to a description of an electrostatic driver with a graphene diaphragm:

nanotechweb

I haven't seen any reports of sheets of graphene big enough to make room-filling sound, though.

(Here's a Wikipedia link for those new to graphene: Graphene)

Few
This may be the answer for large sheets of graphene.

Lead ONTO your pencil: Bill Gates pours cash into graphene condoms ? The Register
  Reply With Quote
Old 28th November 2013, 05:40 PM   #6
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
.. I have enough trouble already convincing my wife that my relations with the HiFi are strictly platonic

.. new cucumber-shaped ESL drivers have great dispersion

.. first it was using Halo Shampoo for coating the membrane, now its...

.... and a million more dumb jokes

Ben
__________________
Dennesen ESL tweets, Dayton-Wright ESL (110-3200Hz), mixed-bass Klipschorn (35-110), and giant OB using 1960's Stephens woofer (20-35); Behringer DSP. HiFi aspirations since 1956
  Reply With Quote
Old 15th April 2014, 04:15 PM   #7
paulfx is offline paulfx  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Cary, NC, USA
Here is the paper:

http://arxiv.org/ftp/arxiv/papers/1303/1303.2391.pdf
  Reply With Quote
Old 15th April 2014, 04:24 PM   #8
paulfx is offline paulfx  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Cary, NC, USA
I guess we can't pick up a roll of this via surplus?
  Reply With Quote
Old 20th April 2014, 06:27 AM   #9
diyAudio Member
 
Join Date: Mar 2014
Location: Southern England
Quote:
Originally Posted by bentoronto View Post
About the constant-charge issue, wouldn't it be OK to have a large resistor in series with the diaphragm or must the diaphragm itself keep the charge from moving around on the diaphragm?
Hi. I don't think it would be OK, as the distribution of charge across the diaphragm would be unstable.

I believe that finding a diaphragm coating of the requisite (high) resistivity and durability is a major headache when designing ESLs. As is the ability to operate properly in the context of a wide range of ambient humidity.
  Reply With Quote
Old 22nd April 2014, 07:37 AM   #10
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Quote:
Originally Posted by keithj01 View Post
Hi. I don't think it would be OK, as the distribution of charge across the diaphragm would be unstable.

I believe that finding a diaphragm coating of the requisite (high) resistivity and durability is a major headache when designing ESLs. As is the ability to operate properly in the context of a wide range of ambient humidity.
What if we had resistive plates instead of a resistive diaphragm?

Dayton-Wrights use very strong but open plastic structures for plates with a metallic conductive coating applied by spray-painting to the surfaces that face the diaphragm. But that coating could be more resistive rather than conductive. Likewise for the way the Quads are made, I think, with printed circuit boards.

Ben
__________________
Dennesen ESL tweets, Dayton-Wright ESL (110-3200Hz), mixed-bass Klipschorn (35-110), and giant OB using 1960's Stephens woofer (20-35); Behringer DSP. HiFi aspirations since 1956
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Graphene capacitor Trileru The Lounge 16 18th March 2013 02:24 AM
FET GHz Graphene transistor apassgear Solid State 2 21st January 2009 09:21 PM
DIY ESL III (based on an ER Audio Kit) jasonlky Planars & Exotics 7 23rd January 2008 07:09 AM
graphite based paint for ESL coating floydturbo Planars & Exotics 2 30th October 2006 11:05 AM


New To Site? Need Help?

All times are GMT. The time now is 02:31 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2