I think the keyword here is that it is a buzzer. I believe it will only oscillate at that freq. What you need is a piezo tweeter(speaker). There are some with high end response up to 40Khz
Question about piezo buzzers
Aug 23, 2005
4 Replies
I want to build a circuit that outputs a 20kHz signal. I found this:
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A Radio Shack search yields:
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If a piezo buzzer has a rating of, say 3,200Hz, does that mean its maximum frequency? Or does it mean its highest output is at that frequency?
A buzzer makes a sound when you apply power. This thing is no different from the one connected to your front door button. It just needs voltage and it will "buzz".
The 3.2KHz is the frequency of the buzzer.
There is a "speaker" part in there, along with an oscillator to actually drive it.
What you would seem to need is merely a speaker, that can handle a high enough frequency.
They'd be called something like a piezoelectric transducer.
Michael
Not necessarily. There are some piezo buzzers with integral drive
electronics, and there are which have to be driven externally. The
frequency which is specified for the ones which have to be driven
externally is the resonant frequency of the piezo element and its
housing, and that\'s the frequency it needs to be driven at to get
the highest SPL out.
no it means you feed it 12VDC (or whatever the specs say) and it gives you approx 3200Hz.
if you want a piezo speaker look in the loudspeakers section of the catalogue.
Most piezo speakers will respond reasonably well up to past 20Khz
Bye. Jasen
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