If the power of high-frequency ultrasonic circuit remains unchanged, the cavitation bubble will become smaller, and the released energy will be reduced accordingly, thus effectively reducing the damage to the workpiece surface. Another advantage of high-frequency ultrasonic circuit is that it reduces the viscous boundary layer (Poinuri effect), so that ultrasonic can "find" extremely small particles. This situation is similar to the small stones at the bottom of the stream when the water level in the stream drops. Therefore, from the perspective of cleaning effect and economy, the frequency is generally selected in the range of 25-135KHZ. Of course, it is very important to correctly select the frequency. However, the selection of specific and appropriate working frequency requires some experiments.

AC 100W 40KHZ Ultrasonic Cleaning Power Driver Board With 50W 40K Cleaning Transducer