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Old 16th December 2008, 02:39 PM   #1
GM is online now GM  United States
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Default New 'FR' driver concept

http://pubs.acs.org/doi/pdf/10.1021/nl802750z
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Old 16th December 2008, 03:46 PM   #2
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I dont understand all of it, but I think it says that a special amp is needed fore the nanofilm to sound correct
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Old 16th December 2008, 04:07 PM   #3
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Is that the same article just referenced on the JoeList?

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Old 16th December 2008, 04:16 PM   #4
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Yes.
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Old 16th December 2008, 04:31 PM   #5
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Here is an earlier thread on this paper

Carbon nanotube loudspeakers

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Old 16th December 2008, 04:53 PM   #6
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Thanks, apparently I didn't use the right 'buzz' words when I searched.

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Old 17th December 2008, 01:30 AM   #7
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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.
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