本设计主要由红外线传感器、信号放大电路、电压比较器、延时电路、音响报警电路、开机延时电路和电源电路组成。人体时时刻刻都在发射人眼不可见的红外波，但是可以被红外线传感器Q74接收，只是这个信号很小。经过前级三极管放大和后级运算放大器LM358放大之后，信号放大到足够大。在电压比较器LM393和延时电路的控制下，能够很好的实现，当有人出现在一定感应范围内时，探测防盗器自动报警。

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