This appears to be the item I have:

Digi-Key - PUI Audio AI-1223-TWT-5V-5-R

This item has internal drive circuitry and requires only DC to function (of the correct polarity). It follows that it will only operate at its design frequency.

 

This item has internal drive circuitry and requires only DC to function (of the correct polarity). It follows that it will only operate at its design frequency.

Sorry, I have multiple buzzers now. This is the one I'm talking about:

Tayda Electronics - ELECTROMAGNETIC TRANSDUCER 1-2VDC 30MA PCB 2 PINS

 

Sorry, I have multiple buzzers now. This is the one I'm talking about:

Tayda Electronics - ELECTROMAGNETIC TRANSDUCER 1-2VDC 30MA PCB 2 PINS

The datasheet for that gives no clue about the frequency response other than resonance at 2048Hz. It follows that the response at other frequencies will be lower but only a guess or an experiment will determine how much lower. It isn't designed to have a wide frequency range, so unlike a loudspeaker.

 

It is much louder at its resonance frequency, especially if its enclosure size is also resonant at that frequency.

 

Okay, thanks.

 

if its enclosure size is also resonant at that frequency.

This seems unlikely. The wavelength of 2048Hz in air is about 16cm. http://www.1728.org/freqwavf.htm

 

I thought my little transducer was wimpy. I scoped it and got 500Hz, instead of the 2048Hz that I programmed the PWM for. When I changed it to output closer to 2048Hz, it is indeed louder. :thumbs up:

 

Will I be destroying the coil if I run this at a lower frequency? I find that I like the lower/quieter tone better.

 

Reducing the frequency will not damage the coil.
The loudness is reduced when the AC signal level is reduced.
Maybe you are feeding it with a squarewave that has harsh high frequency harmonics, a sinewave will sound much smoother.

 

if it has no built in driver you might try embed it in a resonant tank . . . which may reduce the power required to drive it
as you only need the amount of power to maintain the desired amplitude then

something . . . http://tinyurl.com/yyb58z9s