Single-chip development board contains the circuit PCB. . . . U1 = 89C51U2 = 555U3 = MAX232U4 = 24C01U6 = X25045 watchdog X1 = total yang digital tube

平凡试验板2
...........\A4 DPJ.SCH
...........\dpj.pcb
...........\dpj.sch
...........\原理图中IC型号的说明.txt

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