Burglar alarm actuated by cut telephone wire专利检索-降压变压器变压器电机电气元件和设备专利检索查询-专利查询网

Burglar alarm actuated by cut telephone wire

阅读：719发布：2022-01-09

专利汇可以提供Burglar alarm actuated by cut telephone wire专利检索，专利查询，专利分析的服务。并且A burglar alarm which is actuateable by the cutting of a telephone set wire such as located outside of a residence home, the alarm relay switch-actuating circuit being connected to either battery or DC-rectified AC-power source, the detector and actuating circuitry of a preferred embodiment including positive and negative leads connectable to telephone wire contacts of corresponding polarity, each lead including adjacent to the respective contacts, in series, a resistor, the respective resistors being connected to different terminals of each of a third resistor, a capacitor, a zener diode, and a field effect transistor (FET), the negative lead being connected to the FET gate terminal and to the diode such that electrons are flowable solely from said negative lead to said positive lead, and said postive lead being connected to each of the FET source and to a base of typically an NPN transistor, the FET drain being connected in series through a fourth resistor and a relay switch coil to the NPN collector, the relay switch being actuateably closeable of an alarm power circuit, the NPN emitter being connected to one terminal of a second capacitor and to a DC power source terminal of the relay alarm switch-actuating circuit, and the remaining relay switch being connected to each of the remaining terminal of the second capacitor and the remaining coil lead to the relay switch, the relay alarm switch-actuating circuit preferably including, in series, the relay actuating coil, the NPN transistor, a step-down transformer coil, and a rectifier diode permitting DC current to flow toward each of said collector and said drain.，下面是Burglar alarm actuated by cut telephone wire专利的具体信息内容。

权利要求

1. A telephone set cut-line alarm device, comprising in combination: separate postive and negative connector leads; connected across said leads at least each of a first resistor means and a zener diode, at a corresponding end of each of said connector leads, second and third resistor means connected one per lead in series, and at an opposite end of each respective resistor means each resistor means being connectable to a telephone-set line of identical polarity; said zener diode being connected for unidirectional electron flow from said negagive lead to said postive lead; a field effect transistor having separate gate, drain, and source leads, said gate lead being connected to said zener diode at a negative lead thereof; first switch means having second circuit input and output switch contacts for turning on and off respectively a first current flow controllable of a first relay-activation circuit-second current flow, said first switch means being operatively connected to one of said source lead and to said drain lead of said field effect transistor; a first capacitor means having first and second leads, and operatively connected to said zener diode at at-least a postive terminal thereof such that discharge of potential at said gate takes place whenever telephone line voltage on either of said connector leads is terminated or significantly decreased, such that the gate potential is prior to discharge, of a predetermined magnitude large enough to prevent current flow through said drain to said source; a second current-flow circuit including in series within said second current-flow circuit a direct current means providable of direct current, first relay means having first-circuit input and output actuation leads connected for activating said first relay means, and said switch of said first switch meanS, and operatively connected to said source lead; a second capacitor means connected between said first relay means actuating input lead and output lead; said first relay input lead being connected in series with one of said first switch means second circuit contacts; fourth resistor means connected between said drain lead and one of said first relay means input and output leads; and said first relay means including alarm-circuit switch contacts.

2. An alarm device of claim 1, in chich said first switch means comprises a base/emitter/collector transistor having base, emitter and collector leads, one of said first switch means second-circuit input and output switch contacts being connected to said emitter lead and the other of said first switch means second circuit input and output switch contacts being connected to said collector lead.

3. An alarm device of claim 2, in which the first lead of said first capacitor means is connected to said zener diode at a postive terminal thereof, and the second lead of said first capacitor means is connected to said zener diode at a negative terminal thereof.

4. An alarm device of claim 3, in which said base/emitter/collector transistor is an NPN transistor, said collector being connected to one of said first relay means input and output leads.

5. An alarm device of claim 4, in which said direct current means comprises step-down transformer means including primary and secondary coils, and rectifier means for imparting direct current to said second circuit in a flow-direction toward said collector lead, toward said drain lead, from said emitter lead and from said source lead.

6. An alarm device of claim 5, and an alarm circuit including in series with one-another an electrically responsive alarm, said alarm-circuit switch contacts, and said primary coils.

7. An alarm device of claim 6, in which said alarm circuit is about 110 volts AC, in which said transformer secondary coil is about 12 volts AC, and in which said second current-flow circuit is about 15 volts DC.

8. An alarm device of claim 3, in which said base/emitter/collector transistor is a PNP transistor and in which said emitter lead is connected, in series in said second current-flow circuit.

9. An alarm device of claim 8, and an alarm circuit including in series with one-another an electrically responsive alarm, said alarm-circuit switch contacts, and said primary coils, and in which said direct current means comprises step-down transformer means including primary and secondary coils, and rectifier means for operatively imparting direct current from said secondary coil to said second circuit in a flow-direction of electrons toward said emitter lead, and toward said source lead.

10. An alarm device of claim 9, in which said alarm circuit is about 110 volts AC, in which said transformer secondary coil is about 12 volts AC, and in which said second current flow circuit is about 15 volts DC.

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Burglar alarm actuated by cut telephone wire

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