Piezo’s tested against temperature

Over the past week I have tested the Radio Shack piezo, part number 273-073, to see if the piezo current/voltage polarity is due to temperature. Although temperature obviously has an effect on the piezo, it appears that the piezo polarity is not caused by temperature or temperature gradients. I have seen on numerous occasions the temperature increase, and decrease, and the piezo voltage has remain the same polarity.

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