我们知道,表征音频信号变化情况的两个物理量为音频频率和音频电平,在音乐播放过程中,每时每刻这两个参数都在变化。采用本电路可将音频频率及音频电平的变化形象、直观地通过一组LED阵列显示出来。本电路很简单,适合广大电子爱好者及初学者业余制作。电路原理该复合音频显示器的电路如附图所示。音频信号从本电路“IN”端的插口输入,经IC1缓冲放大后一路直接送至 We know that the two physical quantities that characterize the change in the audio signal are the audio frequency and the audio level, and that the two parameters change every moment of the music playback. The use of this circuit can change the audio frequency and audio level image, intuitive display through a group of LED array. This circuit is very simple, suitable for the majority of electronic hobbyists and beginners amateur production. Circuit Theory The composite audio display circuit as shown in the figure. Audio signal from the circuit “IN” side of the socket input, amplified by the IC1 buffer all the way to the direct