This is a video about driving high voltage piezo actuator. Piezo electric device can convert mechanical energy to electrical energy. When converting mechanical energy to electrical energy, this device acts as sensor. Beside that, this device can also convert electrical energy to mechanical energy. When converting electrical energy to mechanical energy, This device acts as actuator. This actuator need 400V supply voltage, so a single amplifier unipolar drive circuit can be used. Here is the video tutorial: