Murata 7BB Piezoelectric Diaphragms This range of piezoelectric transducers from Murata are available with various resonance frequencies and impedance values. With an external drive, these piezoelectric transducers have no contacts, and are highly reliable with no noise. 7BB piezoelectric diaphragms are compact, lightweight and thin. For the voltage type, this series features low power consumption. Product Application Information Suitable for consumer and industrial use, recommended applications include digital cameras, burglar alarms, clocks and calculators.