With the popularity of audio players, more and more people own audio players. However, at the same time when using headphones to make wonderful music, I also feel some shortcomings. Listening to music for a long period of time with headphones can easily cause ear fatigue and damage hearing, which cannot be enjoyed by several people at the same time. At present, there are some small speakers with power amplifiers on the market to make up for the shortcomings, but it is a pity that the general small power amplifier speakers have small power, small speaker caliber, and music without movement. The combination introduced in this article is composed of two parts: high-fidelity power amplifier circuit and miniature speaker. It has the advantages of simple circuit, excellent performance and simple production. Circuit principle: High Frequency Ferrite Transformer,Electric Transformer,Core Type Transformer,Frequency Transformer,coilcraft transformer,electrical transformer IHUA INDUSTRIES CO.,LTD. , https://www.ihua-coil.com