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2.元器件选择IC选用HY-1型音乐集成电路,电路内存储有一首乐曲。该集成电路是小印板软封装。其引脚功能如图3所示。HY—1型音乐集成电路的最大特点是本身电路中含有功率放大器,可以直接驱动扬声器,也无需其他外围元件,接上电源即可工作,使用制作非常方便。晶体管VT1、VT2、VT3、VT4选用9014,如图4所示。也可采用其他型号的NPN型小功率管,要求各管放大倍数基本相同,并合理配对,使β1·β2=β3·β4,以保证电路起振。VD1、VD2选用直径为5mm的圆形发
2. Component Selection IC selection HY-1-type music IC, the circuit has stored a song. The IC is a small pad package. The pin function shown in Figure 3. HY-1-type music IC’s most prominent feature is the circuit itself contains a power amplifier, you can directly drive the speaker, but also without other external components, connected to the power to work, the use of production is very convenient. Transistor VT1, VT2, VT3, VT4 use 9014, as shown in Figure 4. Other types of NPN small power tube can also be used, requiring the same magnification of each tube, and a reasonable pair, the β1 · β2 = β3 · β4, in order to ensure the circuit start-up. VD1, VD2 use a diameter of 5mm round hair