单稳态触发式定时电路

描述

单稳态触发式定时电路如下图所示。该电路将555时基电路接成单稳态形式,平时按钮开关S为常开状态,555时基电路的③脚输出低电平,此时内部放电开关闭合,电容C上的电压为零。当按下按钮开关S时,触发电路翻转,555时基电路的③脚由低电平变为高电平,电路进入暂稳状态。暂稳态结束时,555时基电路的输出端③脚由高电平变为低电平。暂稳态时间tD即为定时时间tW,即tD=tW=1.1RC。这种电路每按动一次开关S,电路就会进入定时工作状态一次,所以这种电路适用于需要手动控制定时工作的场合。

单稳态触发器

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qaz12340 2022-08-22
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