The waveform square wave, sine wave, triangle wave and the sawtooth wave, etc.

其波形有方波、正弦波、三角波和锯齿波等。

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Design requirements: (1) can output sawtooth, triangle wave, sine wave, pulse wave. (2) according to the keyboard command to switch between waveforms. (3) can adjust the output waveform frequency.

设计要求：(1)能够输出锯齿波，三角波，正弦波，脉冲波。(2)能根据键盘命令进行波形之间的切换。(3)能对输出的波形频率进行调节。

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Not that these variations follow a pure sine wave but they have been cyclical.

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The more powerful electronics become, the more susceptible they become to slight variations in this sine wave.

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In a solar system, each planet has its own sine wave.

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