New 'FR' driver concept

GM · 16th December 2008, 02:39 PM

http://pubs.acs.org/doi/pdf/10.1021/nl802750z

tinitus · 16th December 2008, 03:46 PM

I dont understand all of it, but I think it says that a special amp is needed fore the nanofilm to sound correct

planet10 · 16th December 2008, 04:07 PM

Is that the same article just referenced on the JoeList?

dave

GM · 16th December 2008, 04:16 PM

Yes.

planet10 · 16th December 2008, 04:31 PM

Here is an earlier thread on this paper

Carbon nanotube loudspeakers

dave

GM · 16th December 2008, 04:53 PM

Thanks, apparently I didn't use the right 'buzz' words when I searched.

GM

Ron E · 17th December 2008, 01:30 AM

The paper was interesting, they said input frequency is doubled at the output, which made me think "rectifier" - then they explain the mechanism as thermoacoustic, which explains the rectifying behavior. I peruse the link that dave provided and sreten is slamming it as a half wave rectifier - well, it is a full wave rectifier if it produces pressure in response to heating - the carbon film heats up no matter which way the electrons go....

Their workaround for the rectification is to run it with a DC bias so that it never rectifies. This is a waste of power and your bias has to be greater than the highest signal you will use. I am not sure how much power it would be wasting as they don't talk input impedance, AFAIR. One wonders what the efficiency is.

Not exactly flat frequency response, either.

16th December 2008, 02:39 PM	#1
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	New 'FR' driver concept http://pubs.acs.org/doi/pdf/10.1021/nl802750z __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

16th December 2008, 04:07 PM	#3
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Is that the same article just referenced on the JoeList? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

16th December 2008, 04:16 PM	#4
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Yes. __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

16th December 2008, 04:31 PM	#5
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Here is an earlier thread on this paper Carbon nanotube loudspeakers dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

16th December 2008, 04:53 PM	#6
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Thanks, apparently I didn't use the right 'buzz' words when I searched. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.


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16th December 2008, 03:46 PM	#2
tinitus diyAudio Moderator Join Date: Nov 2005	I dont understand all of it, but I think it says that a special amp is needed fore the nanofilm to sound correct

17th December 2008, 01:30 AM	#7
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	The paper was interesting, they said input frequency is doubled at the output, which made me think "rectifier" - then they explain the mechanism as thermoacoustic, which explains the rectifying behavior. I peruse the link that dave provided and sreten is slamming it as a half wave rectifier - well, it is a full wave rectifier if it produces pressure in response to heating - the carbon film heats up no matter which way the electrons go.... Their workaround for the rectification is to run it with a DC bias so that it never rectifies. This is a waste of power and your bias has to be greater than the highest signal you will use. I am not sure how much power it would be wasting as they don't talk input impedance, AFAIR. One wonders what the efficiency is. Not exactly flat frequency response, either. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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