New 'FR' driver concept

[GM]

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

 

[tinitus]

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

 

[planet10]

Is that the same article just referenced on the JoeList?

dave

 

[GM]

Yes.

 

[planet10]

Here is an earlier thread on this paper

http://www.diyaudio.com/forums/showthread.php?s=&threadid=133357

dave

 

[GM]

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

GM

 

[Ron E]

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.