The following are some common sense of high-frequency electromagnetic interference filter. For high-frequency electromagnetic interference (), generally three technologies can be used for power filtering to suppress interference noise. In actual use, two or even multiple technologies are often used in combination. They are: 1. Add a capacitor between the hot wire and the neutral wire of the power supply, that is, the X capacitor. The X2 type is , the main function is to common mode interference, and the capacity range is 0.01UF---0.47UF. 2. Add a capacitor between the power line and the ground line, that is, the Y capacitor. Choose Y2 type, mainly to serial touch interference, and the capacity range is 2200pF~0.1μF. In order to reduce the leakage current, the capacitance must not exceed 0.1μF, and this circuit board uses 0.01UF. 3. Common-mode suppression, common-mode inductance (suppression coils on two power lines), when the rated current is large, the wire diameter of the common-mode should be increased accordingly, so that it can withstand large currents. In addition, increasing the inductance properly can improve the low-frequency attenuation characteristics. This circuit uses 10MH. Material: ABS colour: As shown Package Contents: 1 x Filter module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. EMI Filter filter EMI filter 2A