本系统采用51单片机和DAC0832，在数码管上显示频率值。可以产生方波，正弦波，三角波，锯齿波，可通过按键选择，频率可调。-The system uses a single-chip microcomputer 51 and DAC0832, digital tube display at the frequency value. Could have a square wave, sine wave, triangle wave, sawtooth, through button selec