采用DDS专用芯片AD9851产生正弦波、方波、三角波等波形，经可编程放大器放大后输出,输入在单片机的控制下，经D/A转换后控制AD9851产生波形的类型,波形的幅值、类型、频率和步进值在单片机的控制下由液晶显示。-Dedicated DDS chip AD9851 produced using sine, square, triangle and other waveform amplified by the programmable amplifier output, input under