单片机因其体积小、功能强、价格低廉而得到广泛应用。这个单片机电子琴，利用AT89S52的功能设计电子琴电路，仅仅用AT89L52单片机设计微型电子琴的方法,仅需AT89L52最小系统,扩展一组小键盘（这里以4×4键盘为例,可按需要扩展）,再加一片LM386做音频小功放,输出到扬声器。电源可由12V直流电压或者三节5号电池提供。电路简单，元器件少，很容易制作。-SCM because of its small size, powerful functions, low cost and widely used. The SCM organ, electronic keyboard using the functional design AT89S52 circuit, only miniature keyboard with AT89L52 MCU design method, only AT89L52 minimum system, expansion of a small keyboard (where the 4 × 4 keyboard, for example, may need to be extended), then LM386 plus a small amp to do the audio output to the speaker. 12V DC power supply voltage can be 5 or 3 batteries. Circuit is simple, less components, it is easy to make.