The difference between white characters and dark characters: dark characters are more delicate than white characters, and the visual effect of white characters will be larger than that of dark characters. In the case of the same font size, white characters look larger than dark characters. LM3886TF is a new type of high-power audio amplifier integrated circuit launched by NS company in the United States, and the TF behind it is a fully insulated package. Compared with LM1875T, it has a larger power, up to 68W continuous undistorted average power under rated operating voltage, and also has a relatively perfect overvoltage and overcurrent overheating protection function. The most valuable is that it has the function of automatically resisting the current shock of the switching machine, so that the speaker can work safely. The excellent performance of LM3886 makes it widely used in audio production in recent years, and many finished power amplifiers have direct applications. It serves as a post-level power amplifier or uses it as a heavy bass amplifier circuit. The new hi-fi audio power amplifier integrated circuit LM3886TF introduced by NS company (National Semiconductor Company) is used for power amplification, and the operation amplifier NE5532 or AD827 is used for pre-linear amplification and tone amplification. Its characteristics are: large output power (continuous output power 68W), small distortion (total distortion plus noise