光、声报警器顾平和本机的特点是对盗贼的照明光和声响作出报警，而后再用现场监听的办法来鉴别实况。虽然是有线系统，但导线具备防破坏功能，断线或短路都能报警，故不需暗敷。原理如图所示，光探头由光敏电阻器ＭＧ１和三极管Ｖ组成，探头前还须装用聚光透镜，ＲＰ１调... Light, sound alarm Gu Ping and the machine is characterized by the thieves of light and sound to make an alarm, and then use the site to monitor the way to identify the actual situation. Although the cable system, but with anti-vandalism wire function, wire breakage or short circuit can alarm, it does not dark concealer. The principle is shown in the figure, the optical probe consists of photosensitive resistor MG1 and transistor V, the probe must be equipped with condenser lens, RP1 ...