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 paragraphs, and use five different colors of light-emitting diodes were instructed electricity voltage in which the various states. For the over-and undervoltage In both cases, given the sound alarm