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gui zhong jia dian fang dao bao jing qi
Author(s): 
Pages: 9
Year: Issue:  6
Journal: Family Electronics

Keyword:  报警电路微动开关可控硅触发开关电路触发信号触点断开家电产品防盗报警器语言报警器录像机;
Abstract: <正> 该报警器巧妙利用小型微动开关触发“抓贼呀——”语言报警电路工作,可有效防止彩电、录像机等贵重家电产品被盗。电路如图所示。SCR、R1和S1等组成可控硅触发开关电路;IC、R3、C2、V和B组成语言报警电路。平时,S1因承受放在它上面的贵重家电的压力,使其两常闭触点断开,SCR无触发信号而阻断,语言报警器
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