Maker Pro
Maker Pro

Piezo Buzzers

B

Brian

Jan 1, 1970
0
Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.
 
S

Spehro Pefhany

Jan 1, 1970
0
Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.

Smaller than *what*? A breadbox? And how LOUD is LOUD to you? 85dbA at
10cm? 105dBA at 30cm?


Best regards,
Spehro Pefhany
 
F

Fred Bloggs

Jan 1, 1970
0
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?
 
M

Michael A. Terrell

Jan 1, 1970
0
Fred said:
Which Wal-Mart is the best one to go to in Dayton?

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.
 
K

Ken Smith

Jan 1, 1970
0
Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.

I do. They are small an loud.

I hope this helps.
 
B

Boris Mohar

Jan 1, 1970
0
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
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
 
J

John Larkin

Jan 1, 1970
0
Anybody know of some smaller but LOUD buzzers? Self drive, external drive,
not important. Mostly size and output.

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
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that John Larkin <jjlarkin@highSNIPland
THIStechPLEASEnology.com> wrote (in <td9c11l3prtl9l6043vcnj8ggcspac73pg@
4ax.com>) about 'Piezo Buzzers', on Fri, 18 Feb 2005:
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.

For deaf people like me, the frequency of piezos is usually much too
high. We need something below 1 kHz to be able to hear it clearly.
 
B

Brian

Jan 1, 1970
0
Spehro Pefhany said:
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"
[email protected] Info for manufacturers:
http://www.trexon.com
Embedded software/hardware/analog Info for designers:
http://www.speff.com

Small, as perhaps to fit in a handheld enclosure. Perhaps big around as a
quarter, a half inch tall.

Loud as in as loud as they get. Real screamers. I find alot in that 85-90dB
range to be way too quiet.
 
M

Michael A. Terrell

Jan 1, 1970
0
Spehro said:
Big hamfest there, no?

Best regards,
Spehro Pefhany

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.
 
J

John Woodgate

Jan 1, 1970
0
Loud as in as loud as they get. Real screamers. I find alot in that
85-90dB range to be way too quiet.
How old are you? Maybe you don't hear so well any more. If so, try to
find a product with a lower frequency (between 1 and 2 kHz), which is
likely to be more costly because they are made in much smaller
quantities).

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.
 
F

Fred Bloggs

Jan 1, 1970
0
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.

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.
 
K

Ken Smith

Jan 1, 1970
0
How old are you? Maybe you don't hear so well any more. If so, try to
find a product with a lower frequency (between 1 and 2 kHz), which is
likely to be more costly because they are made in much smaller
quantities).

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.

It is really an issue of impedance matching, isn't it. The little chamber
works like a stripline matching network between the high impedance of the
piezo device and the lower impedance of the air.

Attaching the piezo element to the case and providing a port through the
case can ve very loud.

Motorola used to make 4 inch piezo tweeters. These work even better.
Even someone with hearing protectors thinks its too loud.
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that Ken Smith
Motorola used to make 4 inch piezo tweeters. These work even better.
Even someone with hearing protectors thinks its too loud.

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. (;-)
 
K

Ken Smith

Jan 1, 1970
0
I read in sci.electronics.design that Ken Smith


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. (;-)

They did work great to make the "woooo-weeee" sort of noise that people
expect from a metal detector though. It is best to drive them through an
inductor and use a square wave. The inductor keeps the current spike on
the edge to mere amps and actually seemed to make more of the power end up
in the audio range.

One day, one of the bosses was in the lab. He said "I'm sure glad you
turned that off". I had to inform him that no, it was screeming away at
about 7 or 8KHz. Wearing hearing protection ear-muffs while using an
oscilloscope ... oh the memories.
 
Top