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(a)图由一只LM555电路组成的多谐振荡器作为红外发射管的驱动脉冲发生器.
(b)图是红外线接收器,它有红外线接收管(PH302)和两级放大器组成.
(c)图是计数器.该电路采用成品四位数通用计数器.
