# piezo mic design

Discussion in 'General Electronics Chat' started by marconatali, May 6, 2014.

1. ### marconatali Thread Starter New Member

May 6, 2014
3
0
hello,
I am a student who is doing a piezo microphone design,
could you tell me how to calculate the dynamic load produced by a piezo hit by a sound wave, which we assume is sinusoidal type * sin (kx-wt)?

2. ### #12 Expert

Nov 30, 2010
16,665
7,310
I think your phrasing might be wrong. A piezo mic produces a voltage, not a load, as far as I know. Or are you asking how much the piezo element loads the air wave?

3. ### marconatali Thread Starter New Member

May 6, 2014
3
0
is the voltage
I'm sorry

4. ### kubeek AAC Fanatic!

Sep 20, 2005
4,687
805
Look here https://www.youtube.com/user/EEVblog/videos and watch #602 and the rest of the videos about microphone design.
Basically you need to know the sensitivity of the microphone to calculate the output voltage. Or you could find it from the capacitance of the mic, charge on it and the displacement of the diaphragm.

5. ### marconatali Thread Starter New Member

May 6, 2014
3
0
this is my problem,
calculate v (t) from p (t)

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6. ### kubeek AAC Fanatic!

Sep 20, 2005
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What is p(t) and q(t)? And that illegible bit after kx-wt?