PURPOSE: To demonstrate that a piezoelectric crystal converts electrical impulses into physical vibrations.

DESCRIPTION: An electrical oscillation is converted into a mechanical vibration by a piezoelectric crystal. An audio frequency electrical oscillation from an audio oscillator (in this case a 3 KHz sine wave) is converted into a sound vibration by the piezoelectric crystal. This is a commonly technique commonly employed for creating ultrasound.

SUGGESTIONS: The power supply creates sound without a speaker or crystal, but the sound is much louder with the crystal attached.

REFERENCES: (PIRA 5E60.40)

EQUIPMENT: Piezoelectric crystal with 100 volt audio oscillator.

SETUP TIME: None.