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Piezo buzzer at 20 hz

pinoynva

Jun 5, 2012
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I am trying to vibrate cells in a plate at 20 hz. Is that possible with a piezo buzzer and a waveform generator that can generate 20 hz?

If it is, how do you do it?
 

Harald Kapp

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20 Hz is not a typical operating frequenvy for a piezo but it should work. Just connect the two leads of the piezo to a 20 Hz AC source. The waveform should be ideally sinusoidal. Other waveforms work as well, but you'll have to live with the overtones which a piezo can easily render.

Harald
 

CDRIVE

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The resonant frequency of a Piezo is many octaves higher than this, near 2KHz.
 

pinoynva

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Are you telling me that I can't use buzzers? I read that piezo buzzers has a set frequency but transducers don't. On the other hand, piezoelectric devices respond to the frequency generated. Do you have a suggestion on what I should use? I just need something small that can vibrate at that frequency.
 

Harald Kapp

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No,
read my post. it is possible, although not the optimal operating point.

Harald
 

CDRIVE

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I would suspect that if your purpose is to produce audio it's going to be quite feeble.
 

john monks

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Harald Kapp is correct. Piezo transducers typically don't go that low. Why not use a base speaker? That would certainly give you a lot of amplitude.
 

KrisBlueNZ

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Nov 28, 2011
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I think piezo transducers typically have a pretty low capacitance. It will be hard to transfer a lot of power to them at a low frequency because their reactance will be so high. You might need a very high voltage signal in order to transfer any real power to a piezo transducer at 20 Hz sinusoidal.
 

CDRIVE

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Ha, I forgot about that thread and it was just a few weeks ago! ;)
 
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