此电路的电路分析,求大神指导R1 = 4K7R2, R8 = 1MR3, R4, R9, R10, R11, R12, R13 = 100KR5 = 1KR6, R7 = 470KR14, R15 = 220C1 = 22 pC2 = 82 pC3, C4, C5, C6 = 220nIC1 = 4521IC2 = 4017D1, D2, D4 = 1N4148cristal = 4.1943 MhzD3 = LED 3 mm2 x IC so

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