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89C2051 Digital Clock Group, The Control Chip Adopts AT89C2051, The Digital Tube Adopts Three Two-red Common Positive LED Digital Tubes, The Display Is Clear And The Brightness Is High, Because It Is A Scanning Display Mode, So The  ABCDEFG Pin Of Each Digital Tube Is Connected In Parallel With The Bus, Changing The Resistance Value Of R4-R10 Can Change The Display Brightness.