The paper deals with designing of music controlling system based on microcontroller technology .The audio equipment is in our daily life everywhere .Family audio equipment ,karaoke hall all use the control of the music system. So it is necessary to design a music controlling system. The paper presents the working prnciple and programming method of MCU control circuit in power amplifier especially the sound source test circuit、digital potentiometer interface circuit and music level sampling circuit .The paper uses MCU to control the sound source choosing circuit and digital potentiometer interface circuit .The chip set CD4051 is use in the sound source choosing circuit .the design is realized in the chip of MCS-51 series. The control system features novel functions simple operation and high intelligence etc. this chip set is interfaced with and controlled by a micro-controller, forming system for commercial application.
Key words: microcontroller; power amplifier; CD4051; digital potentiometer