Re: Curious about low-voltage piezoelectric film drivers

Fred Bartoli wrote:
"Rich Grise" <richgrise@xxxxxxxxxxx> a écrit dans le message de
news:pan.2006.03.16.00.01.42.550827@xxxxxxxxxxxxxx

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.

Dirk
.

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