Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

High Frequency Speaker

Status
Not open for further replies.
M

Mansour_M

Full Member level 1
Full Member level 1
Joined
Jul 30, 2006
Messages
99
Helped
11
Reputation
22
Reaction score
3
Trophy points
1,298
Location
Newcastle, UK
Visit site
Activity points
1,944
Hi Everyone,

I am working on a project in which I need to produce acoustic waves in range of 20KHz to 80KHz. The main problem here, is to find a speaker able to generate such wave.
First of all, Is there such speaker? If yes, please guide me. Thanks in advance.
 

There is a speaker called an ionophone (or similar). It works with out any moving parts by modulating a high voltage discharge with the audio. The actual air pressure is generated by the electro static discharge so in principle there is no high frequency limit. One possible disadvantage is the requirement for lots of audio voltage - 600V? which was done with a transformer which in your case would have to be optimised for your unusual frequency range (normally 3-22 KHZ).
Frank
 

Thank everyone,

Acctually, "zrmotoring", I want to use for some kinds of birds. However I am not sure about the range of frequency and I need to perform some test to specify the frequency range.
 

It should be noted, that all piezo air ultrasonic transducers are resonant small band devices, rarely suited as ultrasonic speakers.

Electrostatic transducers can be basically an option.

There's a profound website about plasma tweeters as mentioned by chuckey, unfortunately only partly in English. It has many descriptions, photos and schematics of commercial systems as well as DIY instructions. Ulrich Haumann's DIY PLASMA TWEETER
 

Any loudspeaker with a piezo tweeter ought to do. I had a
set once, a bit "bright" for my liking but high power handling
(until the woofer suspension foam crumbled from age).

For that matter if you're willing to accept a non-flat frequency
response then dynamic (coil) elements may still do, you could
comp the fading output with an opposing high-pass filter / amp.
You're only talking two octaves up from the usual corner freq
for tweeters, right?
 

Any loudspeaker with a piezo tweeter ought to do.
Click to expand...
Unlikely. Did you notice the intended frequency range of 20 to 80 kHz? Many piezo tweeters don't even achieve full sensitivity up to 20 kHz. They mostly have a paper membrane. Some small electrodynamical ring radiators perform better, their sound pressure is considerably higher than piezo tweeters (the price as well), some have output up to 40 even 50 kHz, but with many resonances. The best flat frequency response with moderate SPL is achieved with ribbon tweeters as far as I'm aware of, like the below one:
 

Attachments

  • VIS-1010285.pdf
    120.1 KB · Views: 111

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top