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 ...

This difference is known as an acoustic mismatch. Transducers. The transducer crystal is the heart of ultrasonography. Transducer crystals are capable of transmitting and receiving sound waves ...

Piezoelectric crystals are the core components of ultrasonic transducers, which generate and detect high-frequency sound waves. These transducers are used in medical imaging (e.g., ultrasound), ...