Abstract: An integrated piezoelectric sound transducer and preamplifier is provided within a sealed enclosure and the preamplifier is powered through a coaxial cable utilized for the AC signal output of the preamplifier. By integrating the transducer and preamp, cable noise is eliminated. The preamplifier is implemented with a single FET connected in a source-follower configuration. The gate of the FET is connected to circuit ground through the internal resistance of the piezoelectric material and mass of the transducer, and the drain of the FET is connected to an external power supply through the internal conductor of the coaxial cable that is AC coupled to the source of the FET by a capacitor. In the case of bipolar power supplies over the coaxial cable, the source is connected to either circuit ground or the other polarity of power through a separate diode and filter capacitor.