Importance timing diagrams in designing circuits and systems

In designing circuits and systems we have to analyze behavior more than one component in time space. Toady i want to plot some time diagram and analyze some optical circuit,so i found great software that help me think more easy in circuit and system design.

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Input MicroPhone in CubieBoard

In Past days we  should start recording   voice with a microphone with connected to socket line in cubieboard.When i used arecord command in linux with microphone that is connected to it, it returns "???????????????" in terminal in Fedora linux.

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