Abstract: 555 timer which sets the analog, digital in one of the large scale integrated circuit has been widely used.
摘要：555定时器是集模拟、数字于一体的中规模集成电路，它具有广泛的应用。
Abstract: 555 timer which sets the analog, digital in one of the large scale integrated circuit has been widely used.
摘要：555定时器是集模拟、数字于一体的中规模集成电路，它具有广泛的应用。
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