怎样用NE555设计一个定时电路要求蜂鸣器定时2秒 如何用555定时器设计一个延时一秒的电路
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\u5206\u6bb5\u5f0f\u5b9a\u65f6\u5668\u539f\u7406\u56fe
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\u63a5\u4e0b\u6765\uff0c\u7b2c\u4e8c\u9636\u6bb5\u5b9a\u65f6\u5f00\u59cb\uff0cU1\u7b2c3\u811a\u7684\u9ad8\u7535\u5e73\u901a\u8fc7R2\u3001RP2\uff0c\u5411C3\u5145\u7535\uff0c\u4f7f\u5f97\u7b2c6\u811a\u7535\u4f4d\u9010\u6e10\u4e0a\u5347\uff0c\u5347\u81f36V\u76842/3\u65f6\uff0cU2\u590d\u4f4d\uff0c\u7b2c3\u811a\u8f93\u51fa\u4f4e\u7535\u5e73\uff0c\u7ee7\u7535\u5668K\u91ca\u653e\uff0c\u7b2c\u4e8c\u9636\u6bb5\u5b9a\u65f6\u65f6\u95f4\u5230\u3002\u8be5\u6bb5\u65f6\u957f\u4e3a\uff1aT2=1.1x(R2+RP2)xC3.
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单稳态触发器就行了，下面是外围比较少的延时电路。
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