频率波形发生器，通过按键来选择要输出的波形，可选择的种类是一定的，有锯齿波，三角波，方波，正弦波等-Frequency waveform generator to select the waveform to be output through the button, you can choose the kind is certain, there are sawtooth, triangle wave, square wave, sine wave, etc.

三角波波形发生器，是一个利用单片机DA数码管显示为一体的仿真-Triangle wave form generator, using single chip computer is a DA digital tube display for the integration of simulation