The required circuit is called a schmitt trigger. It has two possible states just like other multivibrators. （ 2 ）添加组件库。单击 add library 按钮，将弹出查找文件夹对话框，选择安装 altium designer 组件库的路径。然后根据项目需要决定安装哪些库就可以了。例如本例需要555芯片，我们.
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However, the trigger for this circuit to change states is the input voltage level, rather.
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