Re: Curious about low-voltage piezoelectric film drivers

On Thu, 16 Mar 2006 10:52:59 +0000, Dirk Bruere wrote:
Fred Bartoli wrote:
"Rich Grise" <richgrise@xxxxxxxxxxx> a écrit dans le message de
On Tue, 14 Mar 2006 21:07:45 -0800, benjamin.eckel wrote:

I am trying to build a low voltage (0 - 9 volts) system to drive
piezoelectric film to produce a 5kz sound wave to test it's ability to
annoy female mosquitoes. Supposedly, male mosquitoes produce this
sound.
I know a fair deal about electronics but not much about piezoelectric
film or Integrated Circuits. Does it take film with a special resonant
frequency to produce the specified sound or can some source of PWM be
used to adjust the frequency? Any information is useful especially a
diagram of a circuit I can build.

Well, notwithstanding those things have never worked, who told
you you need a "piezoelectric film"? What _is_ a "piezoelectric
film"? You can put out 5 KHz with a 39-cent PC speaker and a
555 oscillator and a few Rs and Cs.

But it won't repel mosquitos.

But it is not a "piezoelectric film"

Piezoelectric transducer is what he's looking for.
Good up to a lot more than 5kHz.
Maybe drive it with a square wave to get lots of higher frequency harmonics.


Like these?
http://dkc3.digikey.com/PDF/T061/1509.pdf

Cheers!
Rich

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