The optimal resonance point of each transducer in the 28KHZ-40KHZ ultrasonic transducer circuit board is different in space. If working at a fixed frequency point, the vibration intensity of each area of the vibrating plate varies greatly. A fixed working frequency also generates a large number of standing wave areas in the transmission of ultrasonic cleaning fluid. Over time, with changes in various environmental conditions, The change of resonance point is also very obvious. Summary: the Ultrasonic cleaning has great limitations in working at a fixed frequency point, which greatly reduces the cleaning effect of the cleaner. By making the operating frequency point output by the ultrasonic generator change periodically within a certain range

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