Description: 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.
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