Piezo injectors use a stack of piezo crystal plates that expand when an electric current is applied. That expansion causes the needle to move. The expansion of the piezo crystals is more precise ...

The crystal in a crystal earpiece is a piezoelectric sound transducer. Back in the 1960s, these were fairly common in cheap transistor radios and hearing aids. Their sound fidelity isn’t very ...

The piezoelectric effect arises from the asymmetric arrangement of atoms in certain crystalline materials. When a piezoelectric crystal is subjected to mechanical stress, the deformation of the ...

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The piezo element itself is then directly hooked up to a mono audio jack for use with one of [Billy’s] crystal radios. To make it into a usable earpiece, the tip of a pen is cut off and glued to ...