The self-excited ultrasonic circuit board is generally used in small desktop ultrasonic cleaners. Its main characteristics are simple circuit, simple maintenance and low price, but its disadvantages are also obvious. At present, most domestic small desktop ultrasonic cleaners mainly use self-excited ultrasonic drive circuits, resulting in a large deviation between the actual ultrasonic frequency and ultrasonic power and the standard ultrasonic frequency and power, This will further affect the distortion of many experimental data or cause damage to the cleaning parts when purchasing a small desktop ultrasonic cleaner to clean precision parts. For more professional scientific research institutions and laboratories, they should try to choose an alternative ultrasonic driving circuit when purchasing ultrasonic cleaning instruments;

28khz Drive PCB type circuit Ultrasonic Generator PCB