基于AVR单片机的数控稳压电源源程序，可以通过PD2选择电压、电流、幅值、频率设置，并通过PD3进行增量调节，PD4进行减量调节。-NC-based AVR microcontroller power supply source, you can choose by PD2 voltage, current, amplitude, frequency settings, and through incremental adjustment PD3, PD4 for reducing regula