Piezo Buzzers

B

Brian

Guest
Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.
 
On Thu, 17 Feb 2005 22:50:13 -0600, the renowned "Brian"
<brian@w3gate.com> wrote:

Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.
Click to expand...
Smaller than *what*? A breadbox? And how LOUD is LOUD to you? 85dbA at
10cm? 105dBA at 30cm?


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.
Click to expand...
Which Wal-Mart is the best one to go to in Dayton?
 
Fred Bloggs wrote:
Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.

Which Wal-Mart is the best one to go to in Dayton?
Click to expand...
If you want a Piezo in Dayton you go to Mendelson's :)
http://www.meci.com/ Better yet, go to their store and look at all the
electronics they don't catalog.


--
Beware of those who suffer from delusions of adequacy!

Michael A. Terrell
Central Florida
 
In article <U9WdnZX-QMy_6IjfRVn-iw@centurytel.net>,
Brian <brian@w3gate.com> wrote:
Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.
Click to expand...
I do. They are small an loud.

I hope this helps.

--
--
kensmith@rahul.net forging knowledge
 
On Thu, 17 Feb 2005 22:50:13 -0600, "Brian" <brian@w3gate.com> wrote:

Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.


If you have a low voltage source you can still get a fair bit of bang by
Click to expand...
driving a dual RS232 out of phase and using the outputs to drive a piezo.



Regards,

Boris Mohar

Got Knock? - see:
Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca
 
On Thu, 17 Feb 2005 22:50:13 -0600, "Brian" <brian@w3gate.com> wrote:

Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.
Click to expand...
Piezos are the acoustic scourge of the electronics age. Nasty little
things. It's not hard - fun, actually - to make bell, gong,
wind-chime, bird-chirp, explosion, or other more interesting sounds
with a speaker.

John
 
On Thu, 17 Feb 2005 22:50:13 -0600, Brian wrote:

Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.
Click to expand...

http://www.google.com/search?q=sonalert&btnG=Google+Search

Have Fun!
Rich
 
Spehro Pefhany wrote:
On Fri, 18 Feb 2005 14:11:05 GMT, the renowned "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:

If you want a Piezo in Dayton you go to Mendelson's :)
http://www.meci.com/ Better yet, go to their store and look at all the
electronics they don't catalog.

Big hamfest there, no?

Best regards,
Spehro Pefhany
Click to expand...
I haven't been to the dayton hamfest since 1987. :(

http://www.hamvention.org/

General Admission Ticket:
Don't get stuck in line, get your advanced 2005 Hamvention tickets for
the May 20, 21, 22, 2005 now. Admission tickets will be $25.00 at the
show.

--
Beware of those who suffer from delusions of adequacy!

Michael A. Terrell
Central Florida
 
Have you measured 85-90 dB? These things use a resonant cavity
(Helmholtz resonator) to boost output a lot. If the piezo is even a bit
off-tune with the cavity resonance the output drops considerably.
Click to expand...
Not possible with the self-oscillating electrode tapped piezo ceramic
disc types....and anything that could be called an alarm is more like
105dB at 1m in the industrial world.
 
I read in sci.electronics.design that Ken Smith
<kensmith@green.rahul.net> wrote (in <cv8cla$kbj$3@blue.rahul.net>)
about 'Piezo Buzzers', on Sat, 19 Feb 2005:

Motorola used to make 4 inch piezo tweeters. These work even better.
Even someone with hearing protectors thinks its too loud.
Click to expand...
Yes, we could get around 105 dB SPL at 1 metre anechoic. But they were
not very reliable; in general, not just in that application. And the
linearity was conspicuous by its minuteness. (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
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