CN2164167Y - 用于电话分机的防窃听装置 - Google Patents

用于电话分机的防窃听装置 Download PDF

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CN2164167Y
CN2164167Y CN 93221057 CN93221057U CN2164167Y CN 2164167 Y CN2164167 Y CN 2164167Y CN 93221057 CN93221057 CN 93221057 CN 93221057 U CN93221057 U CN 93221057U CN 2164167 Y CN2164167 Y CN 2164167Y
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eavesdropping
triode
circuit arrangement
extension telephones
preventing circuit
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CN 93221057
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陈友敏
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Abstract

本实用新型有关一种用于电话分机的防窃听装 置,设有由电阻R2、可变电阻R1组成的分压电路、 三极管T1、T2及发光管D、扬声器LR,窃听与否控 制三极管T1、T2的导通或截止,从而通过三极管 T1、T2控制是否窃听报警。安装接线简便,使用方 便,结构简单,成本低,具有优良的防窃听功能。

Description

本实用新型涉及一种用于电话分机的防窃听装置。
目前具有电话分机的接听极不方便,如果安装了保密隔离器,则相互间的电话经常接错,一旦接错,又要打电话者重拨一遍,虽然保密性增加了,但使用不方便;若不采用保密隔离器,则分机可同时接听,且无法防止窃听。
本实用新型的目的在于克服上述缺陷,提供能有效防止窃听的用于电话分机的防窃听装置。
本实用新型设有由电阻R2、可变电阻R1组成的分压电路、三极管T1、T2及发光管D、扬声器LR,三极管T1基极接可变电阻器R1、集电极接三极管T2基极,发光管D、扬声器LR并联接在三极管T2的集电极。
以下结合实施例及附图进一步说明本实用新型。
附图为本实施例的线路结构图。
本实施例设有由电阻R2、可变电阻R1组成的分压电路、三极管T1、T2及发光管D、扬声器LR,三极管T1基极接可变电阻R1,集电极接三极管T2基极,发光管D、扬声器LR并联接在三极管T2的集电极,装置中电阻R4、R5为限流电阻,电容C起滤波作用。为防止接线错误,由电阻R2、可变电阻R1组成的分压电路通过由二极管D1~D4组成的桥式整流电路接电话线。
当分机不同时接听,即无窃听时,三极管T1先导通,流经电阻R5的电流从T1流出,三极管T2不导通,装置无声光报警,一旦有窃听,三极管T1基极从分压电路中得不到足够分压,处于截止状态,而此时,三极管T2导通,装置有声光报警,上述过程通过调节电阻参数即可。
本实用新型结构简单,安装接线简便,成本低,用于分机使用时,能有效地防止窃听,且使用方便。

Claims (2)

1、一种用于电话分机的防窃听装置,其特征在于:设有由电阻R2、可变电阻R1组成的分压电路、三极管T1、T2及发光管D、扬声器LR、三极管T1基极接可变电阻R1、集电极接三极管T2基极,发光管D、扬声器LR并联接在三极管T2的集电极。
2、根据权利要求1所述的用于电话分机的防窃听装置,其特征在于:所述的由电阻R2、可变电阻R1组成的分压电路通过由二极管D1~D4组成的桥式整流电路接电话线。
CN 93221057 1993-08-01 1993-08-01 用于电话分机的防窃听装置 Expired - Fee Related CN2164167Y (zh)

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CN 93221057 CN2164167Y (zh) 1993-08-01 1993-08-01 用于电话分机的防窃听装置

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Application Number Priority Date Filing Date Title
CN 93221057 CN2164167Y (zh) 1993-08-01 1993-08-01 用于电话分机的防窃听装置

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CN2164167Y true CN2164167Y (zh) 1994-05-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110070685A (zh) * 2019-06-18 2019-07-30 吴圣铎 播种机种子堵塞声光提醒器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110070685A (zh) * 2019-06-18 2019-07-30 吴圣铎 播种机种子堵塞声光提醒器

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