设计利用多谐振荡电路作为红外线发射器的驱动电路，驱动红外发射管，向布防区内发射红外线，接收端利用专用的红外线接收器件对发射的红外线信号进行接收，经放大电路进行信号放大及整形后驱动数字门电路，输出报警信号，又经报警信号锁定电路，将报警信号进行锁定，即使现场的入侵人员走开，报警电路也将一直报警，直到人为解除后方能取消报警。-Design using multivibrator as infrared transmitter driver circuit, driver infrared emission control, the infrared emission to the deployment in the region, using a dedicated infrared receiver on the emission of infrared receiving device to receive signals by the amplifier circuit for signal amplification and shaping number of gates after the driver, the output alarm signal, alarm signal has been locked circuit, the alarm signal lock, even if the invasion site staff away, the alarm circuit will also have the police, until after the man lifted to cancel the alarm.