PAM8907 31VPP Output Piezo Sounder Driver Diodes Incorporated PAM8907 31VPP Output Piezo Sounder Driver with Boost Converter is a piezoelectric horn driver that can drive a ceramic/piezo sounder with up to 31VPP output. Implementing an integrated boost converter, the PAM8907 provides an optimized solution with a higher Sound Pressure Level (SPL) for louder output sound, lower quiescent current for longer standby time, and auto turn-on/off feature for an extended operating lifetime. The PAM8907 Driver is ideal for a battery-operated tracker, piezoelectric horn, or alarm-related applications.