Ah, see I didn't know any of that.  Not to mention I've never been able
to find a datasheet for this particular type of element.  Trust that
I've done some searching, just never turned anything up and I had to
move on.  But since it's been brought up, might as well beat the horse
till it drops, right?

Matt Pobursky wrote:

> C'mon Shawn, have a little resourcefulness... ;-)
>
> If you look at datasheets for a variety of physically similar devices,
> you'll see that they all have specs in the same basic range for
> capacitance and resonant frequency. This is basic physics, they're all
> made from the same materials using the same basic process. You can
> always find the resonant frequency by driving the piezo element with an
> external signal generator and listen for the loudest frequency. You can
> also measure it by putting a small resistor in series with the piezo
> and look for the largest voltage drop across the piezo element -- this
> will be it's resonant frequency.
>
> It really doesn't take very long to characterize a given piezo element,
> even if there are no markings on it at all.
>
> Matt Pobursky
> Maximum Performance Systems
>
> On Wed, 16 Jun 2004 11:10:51 -0700, Shawn Wilton wrote:
>
>>But you have to know the manufacturer to begin with.  All the ones I
>>picked up were from surplus and there's no indication of manu.
>>
>>Matt Pobursky wrote:
>>
>>
>>>On Wed, 16 Jun 2004 09:12:57 -0700, Shawn Wilton wrote:
>>>
>>>
>>>>Don't forget these need a lot of voltage.  I have a bunch of the 3 lead
>>>>kind and you can run it with one lead, but you get low-moderate noise at
>>>>20 volts.
>>>
>>>
>>>You can greatly augment the acoustic output of piezo devices by edge
>>>mounting them (this keeps mechanical damping to a minimum). Most piezo
>>>manufacturers sell PCB mounting clips that hold them by the edges and
>>>provide electrical contact especially for this purpose.
>>>
>>>You can also greatly increase the acoustic output by mounting the piezo
>>>element in a tuned (resonant) enclosure. This is why many piezo buzzers
>>>are sold in plastic cases. The case itself holds the piezo element by
>>>it's edge in an enclosure tuned to it's resonant frequency.
>>>
>>>I wouldn't consider myself a piezo buzzer expert, but I've used almost
>>>every type I have seen in dozens of applications over the past 25
>>>years. Most of this information is available from the manufacturers
>>>directly.
>
>
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