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- 该设计主要是对五段市电电压报警指示电路的研制。它主要是将市电电网电压分成五段,并用五种不同颜色的发光二极管分别指示市电电压所处的各种状态。对于过压和欠压两种情况,给出声音报警提示-The design mainly for in paragraph 5 electricity voltage alarm indicator circuit development. It is mainly electricity grid voltage is divided into five paragra