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Wireless Wooden Speaker

by AlfieD
Tags: cube, iphone, speaker, wireless, wooden
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AlephZero
#19
Jan20-14, 04:48 PM
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Quote Quote by berkeman View Post
Interesting. I don't know what the typical cell phone "speaker" piezo structure is like. Does anybody know what that output looks like acoustically? Can it benefit from a horn or other output acoustic structure?
I don't know about the transducers in cellphones, but good quality piezo loudspeakers do use a horn for acoustic impedance matching. http://www.bestgrouptechnologies.com...background.php

They are usually called "bullet" tweeters, from the shape of the central part of the horn structure (which is fixed, not connected to the piezo element). Without the "bullet", the maximum frequency would be limited not by the transducer, but the "cutoff frequency" when the radius of the horn was the same order of magnitude as the wavelength of the sound (about 15mm, to cover the full human hearing range).

mrspeedybob
#20
Jan26-14, 04:37 PM
P: 693
Have you considered putting some electrical guts in your box? Microphone under the cell phone, batteries, amplifier, speakers.
AlfieD
#21
Jan26-14, 04:43 PM
P: 68
Quote Quote by mrspeedybob View Post
Have you considered putting some electrical guts in your box? Microphone under the cell phone, batteries, amplifier, speakers.

We can't. :( It had to be a sustainable speaker; no electrical a whatsoever.


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