可调方波发生器，可以控制方波的幅值，频率，占空比。,Adjustable square wave generator, square wave to control the amplitude, frequency, duty cycle.

矩形波发生器:输出频率范围为10HZ-1KHZ,输出电压为5V,且占空比10％-90％可调,输出频率也可调节-Rectangular-wave generator: output frequency range of 10HZ-1KHZ, output voltage of 5V, and 10-90 duty cycle adjustable output frequency is also adjustable