Abstract: This audio application note identifies and describes the key elements in designing a driver for a piezoelectric transducer (PZT). The relationship between source impedance and sound pressure level is measured, single-ended (S/E) and bridge-tied load (BTL) driving schemes are compared and the input impedance of a PZT is characterized. Maxim > App Notes > Amplifier and Comparator Circuits Audio Circuits Keywords: audio driver, BTL, bridge tied load, PZT, piezoelectric, audio transducer Mar 26, 2002 APPLICATION NOTE 988 Driving Audio Piezoelectric Transducers Abstract:This audio application note identifies and describes the key elements in designing a driver for a piezoelectric transducer (PZT). The relationship between source impedance and sound pressure level is measured, single-ended (S/E) and bridge-tied load (BTL) driving schemes are compared and the input impedance of a PZT is characterized. Audible piezoelectric transducers (PZTs) are often used as warning devices or alarms. Manufacturers of piezo transducers publish curves and specifications concerning their respective devi……