Since 2000, the audio PWM Amplifier, or Class D Amplifier, has spread rapidly. However, Analog Amplifiers are still used in special applications, one of which is a linear drive amplifier for piezo actuators. But, by applying state-of-the-art switching technology, it is possible to improve efficiency in that field. Marutsu has created this as an amplifier module. New amplifier modules enable high efficiency and miniaturization, high speed and high precision. PWM Amplifier technology broadens the possibilities of new piezo applications.