用PIC单片机控制继电器通断，同时发出"啪啪"声-, Also issued a " popping" sound-off control relay with PIC microcontroller

DA 转换模块，TLC5615通过单片机I/O 口直接控制继电器或可控硅是后向通道中最简单的形式。-DA converter module, TLC5615 directly through the MCU I/O port control relay or SCR is the most simple form of the backward channel.