无线电爱好者都熟悉CW9300音乐集成块,它的芯片虽然很小,但里面却有很多晶体管组成的各种振荡、放大、存储等电路。本实验电路就是利用了里面存储的一首圣诞曲。该音乐集成电路有9个引脚,①脚为触发端,当接正电源时发出音乐信号,接负电源时停止;③脚为音乐信号输出;⑤脚接地端;⑦⑧脚为速度控制,两脚连接的电阻大小而乐曲奏出的速度就有快慢;⑨脚接正电源,其他脚空着。它的电源一般设在 Radio enthusiasts are familiar with the CW9300 music block, although its chips are small, but there are a lot of transistor composed of a variety of oscillation, amplification, storage and other circuits. The experimental circuit is the use of a Christmas song stored inside. The music integrated circuit has 9 pins, ① pin is the trigger terminal, when connected to the positive power when the music signal, then stop when negative power; ③ feet for the music signal output; ⑤ foot ground; ⑦ ⑧ feet for speed control, two The size of the resistance of the foot connection and the speed of the music played there speed; ⑨ feet connected to the positive power supply, the other feet empty. It’s power is generally located in