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本文介绍一种带音乐演奏的扩音喇叭电子电路。这种喇叭体积小巧,发音宏亮,可内存94首世界名曲,适合运动会、团体旅游等公众活动的场合使用。 音乐喇叭外形及电路如图所示、音乐喇叭由扩音部分、音乐旋律存储器及电源供给三部分组成。 扩音部分电路由小型功率放大集成电路LA4140组成。话音信号由驻极体话筒(MIC)经C6耦合到音量电位器RP,调整后的语音信号电压经C8输入到IC2。IC2的⑥脚输出信号经C12带动喇叭。 音乐旋律存储器系大规模集成电路。音乐旋律的输出是
This article describes a PA speaker amplifier with music. This trumpet compact size, pronounced bright, memory of the first world famous songs, suitable for sports, group travel and other public events occasions. Music speaker shape and circuit as shown, the music speaker from the amplified part of the music melody memory and power supply composed of three parts. PA part of the circuit by the small power amplifier integrated circuit LA4140 composition. Voice signal from the electret microphone (MIC) through the C6 coupled to the volume potentiometer RP, the voice signal voltage adjusted by C8 input to IC2. IC2 ⑥ foot output signal driven by the C12 speaker. Music melody memory is a large scale integrated circuit. The output of the music melody is