本文介绍的红外线报警器,可监控30m以内的通道、仓库等地方,当有外人进入监控范围时,电路自动发射无线电波给接收机,以进行报警,其报警距离可达1.5km。工作原理图1为该报警器的发射机电路原理图。由IC_1时基电路与R_2、R_3、C_4等组成频率为40 This article describes the infrared alarm can monitor channels within 30m, warehouses and other places, when outsiders into the monitoring range, the circuit automatically emits radio waves to the receiver for alarm, the alarm distance up to 1.5km. Working principle Figure 1 is the alarm transmitter circuit schematic. By the IC_1 time base circuit and R_2, R_3, C_4 and other components of the frequency of 40