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发明名称
一种电话外线防偷搭窃打装置
摘要
一种能防止电话线路被偷搭窃打的装置,它是由光电耦合器的发光管与一VMOS场效应管的漏极相连接,VMOS场效应管的栅极又与另一VMOS场效应管的漏极相连接,另一VMOS场效应管的栅极,经由一电阻再与双向触发二极管(DIAC)和光电耦合器的光敏管并联电路连接至电话线的正极,VMOS场效应管的源极都接在电话线的负极,用户话机接在另一VMOS场效应管的栅极和电话线的正极间,这可确保用户话机使用时不受影响(该装置保持截止),而当有人偷搭外线窃打电话时,该装置产生振荡信号使偷搭话机无法使用。
申请公布号
CN2214056Y
申请公布日期
1995.11.29
申请号
CN94231276.7
申请日期
1994.12.31
申请人
陈树光
发明人
陈树光
分类号
H04M1/00
主分类号
H04M1/00
代理机构
代理人
主权项
1、一种电话外线防偷搭窃打装置,其特征在于光电耦合器的发光管与一VMOS场效应管的漏极相连,VMOS场效应管的栅极与另一VMOS场效应管的漏极相连,另一VMOS场效应管的栅极又经一电阻与光电耦合器的光敏管相连。
地址
350001福建省福州市商业局工业品科曹红艳转
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