电话断线探测器（英文）,Cut Phone Line Detector
电话断线探测器（英文）,cut phone line detector
关键字：电话断线探测器（英文呢）
a while ago i got an email asking for the schematic of a circuit to detect cut phone lines. it didn't take me long to find this circuit in electronics now. when the circuit detects that a phone line has been cut, it activates a mosfet which can be used to drive a relay, motor, etc. it can also be connected to a security system.
circuit diagram
parts
r1, r2, r3 22 meg 1/4 w resistor
r4 2.2 meg 1/4 w resistor
c1 0.47uf 250v mylar capicitor
q1 2n3904 transistor or 2n2222
q2 2n3906 transistor
q3 irf510 power mosfet
d1 1n914 diode
load see notes
misc wire, phone connectors, circiut board
notes
1. the load can be a relay, lamp, motor, etc. the circuit can also be connected to a security system to sound an alarm in case the phone line is cut.
2. if the circuit is connected to a security system or other circuit, both circuits must be electrically isolated from each other using an opto-isolator, relay, etc. this also means that the cut phone line detector must be powered by a seperate 9v supply.
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电话断线探测器（英文）,Cut Phone Line Detector
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关键字：电话断线探测器（英文呢）
a while ago i got an email asking for the schematic of a circuit to detect cut phone lines. it didn't take me long to find this circuit in electronics now. when the circuit detects that a phone line has been cut, it activates a mosfet which can be used to drive a relay, motor, etc. it can also be connected to a security system.
circuit diagram
parts
r1, r2, r3 22 meg 1/4 w resistor
r4 2.2 meg 1/4 w resistor
c1 0.47uf 250v mylar capicitor
q1 2n3904 transistor or 2n2222
q2 2n3906 transistor
q3 irf510 power mosfet
d1 1n914 diode
load see notes
misc wire, phone connectors, circiut board
notes
1. the load can be a relay, lamp, motor, etc. the circuit can also be connected to a security system to sound an alarm in case the phone line is cut.
2. if the circuit is connected to a security system or other circuit, both circuits must be electrically isolated from each other using an opto-isolator, relay, etc. this also means that the cut phone line detector must be powered by a seperate 9v supply.
Aigtek线束转接箱，助力大批量、不同规格线束测试更高效！
在Boost电源中该怎样去选择电容的型号和电容容量呢？
如何开发与自定义应用的音频分类模
LED在自然用户界面中有着怎样的重要性
高压放大器基于声纹影法的声可视化实验的应用
电话断线探测器（英文）,Cut Phone Line Detector
中华v3最高月销量曾达1.8万辆,颜值和性价比完爆宝骏510,不知道新款中华v3上市后，会不会创造销量神话？
Qorvo 企业社会责任报告 – 做好应做之事
火焰探测器的特性及工作原理解析
LTspice：加快模拟速度
SMT贴片加工厂锡膏管控的五大原则及要求
基于SPV1020设计的太阳能电池DC-DC电源转换方案
基于锁相环频率合成器的关于合成器的简要概述
腾讯极光4G盒子上手 到底怎么样
连接器在特殊环境中应具备的关键性能有哪些？
随着芯片技术的不断突破，家电智能化将会实现普及
vivo最新黑科技——TOF 3D超感应技术
为什么需要Docker容器？Docker容器和VM有什么区别？
英特尔确定Sandy Bridge平台Z68芯片组发布日期
华为鸿蒙系统 “超级终端”功能打造完全无缝的使用体验