you connect the piezo speaker leads to the input leads of
an oscilloscope and tap on the speaker with your finger,
you ought to get a trace very similar to Figure 2.
You could also see voltage change with the
application of a temperature change. I do not recommend
applying heat to see this voltage change. It is too easy to
permanently damage the film. If you are adventurous, try
applying heat from a bare incandescent lamp while
observing the trace on a high impedance oscilloscope. NV
A complete kit to go with this article can be purchased online
from the Nuts & Volts Webstore www.nutsvolts.com
or call our order desk at 800-783-4624.
REFERENCES
Kawai, H., (1969). Jpn. J. Appl. Phys, 8, 975-976.
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