CN201773463U

CN201773463U - Household disconnection theft-proof alarm

Info

Publication number: CN201773463U
Application number: CN2010205379219U
Authority: CN
Inventors: 王雪峰; 李嘉
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-09-17
Filing date: 2010-09-17
Publication date: 2011-03-23
Anticipated expiration: 2020-09-17

Abstract

The utility model relates to an alarm device, in particular to a household disconnection theft-proof alarm. The alarm comprises an electronic self-locking switching circuit, an alarm sound production circuit, an alarm indicating circuit, a capacitor C, a switch K, a power supply and two terminal points A and B, wherein the electronic self-locking switching circuit consists of resistors R1, R2 and R3, a triode T1 and a unidirectional SCR (silicon controlled rectifier) or a transistor; the alarm sound production circuit consists of alarm music films IC and T2 and a loudspeaker BL; the alarm indicating circuit consists of a resistor R4 and a green LED (light-emitting diode); and the R4 and the green LED are connected in series at the anode a of the SCR, the capacitor C is connected in parallel with the alarm sound production circuit and the alarm indicating circuit, the point A is connected with the base of the triode T1, and the point B is connected between the R4 and the green LED. If a thief performs theft, an enameled wire is broken by the thief, the points A and B are disconnected, and the alarm sound is continuous so that the property safety is ensured. The alarm has low cost, good concealment and accurate early warning, and is a household ideal theft-proof alarm.

Description

Family expenses broken string burglar alarm

Technical field

The utility model relates to a kind of warning device, specifically a kind of family expenses broken string burglar alarm.

Background technology

Along with expanding economy, people are more and more rich, and still, robbed or burgled phenomenon is still continuous.People are seeking a kind of burglar alarm always, avoid or alleviate the robbed or burgled economic loss that causes.Burglar alarm is multifarious at present, but mechanism's complexity is installed trouble, and sensitivity is not high.

Summary of the invention

The purpose of this utility model provides a kind of simple in structure, the easy family expenses broken string of installation burglar alarm.

The utility model comprises warning indicating circuit that warning phonation circuit that the electronics self-lock switch circuit, warning musical film IC, T2, the loudspeaker BL that are made of resistance R 1, R2, R3, triode T1, one-way SCR (transistor) SCR constitute and resistance R 4, green emitting two utmost point LED constitute and capacitor C, K switch, power supply, A, B two wiring points; R1 links to each other with the base stage of triode T1, and R2 links to each other with the collector of triode T1, and R3 links to each other with the emitter of triode T1; The other end of R3 is connected in the control utmost point g of controllable silicon SCR, the negative electrode k of controllable silicon SCR is connected with R2, R4 and green LED are connected on the anode a of controllable silicon SCR, capacitor C is in parallel with warning musical film and warning indicating circuit, the collector of triode T2 links to each other with Yang Sheng device lower end, and the base stage of triode T2 links to each other with warning musical film IC, and the emitter of triode T2 links to each other with positive source, the A point is connected in the base stage of triode T1, and the B point is connected in the middle of R4 and the green LED.

During use, it is first-class only fine enamelled wire need to be installed in door and window, kitchen cabinet, valuables external packing, farm cattle halter rope, the shelter that the alarm main frame is placed on the bedroom or is difficult for finding, connects A, B 2 points, closed power switch.When if the robber steals, enameled wire will be pulled apart by the robber, and after disconnecting between 2 of A, the B, chimes of doom is continuous.

The utility model has following advantage compared with prior art:

Because characteristics of transistor, in case after the conducting, even short circuit enameled wire again removes trigger voltage, also still can keep conducting state, chimes of doom is continuous.Wanting that compulsory commutation reports to the police can only cut-off switch K, otherwise chimes of doom will can be heard without end, thereby the property of having guaranteed you is safe and sound.This cost of products is little, good concealment, and forecast is accurate, is the desirable burglar alarm of family.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is circuit theory diagrams of the present utility model.

Among the figure, T1. triode, SCM. one-way SCR, IC. warning musical film, T2. triode, LED. green LED, BL. loudspeaker.

Embodiment

In the drawings, the utility model comprises warning indicating circuit that warning phonation circuit that the electronics self-lock switch circuit, warning musical film IC, T2, the loudspeaker BL that are made of resistance R 1, R2, R3, triode T1, one-way SCR (transistor) SCR constitute and resistance R 4, green LED LED constitute and capacitor C, K switch, power supply, A, B two wiring points; R1 links to each other with the base stage of triode T1, and R2 links to each other with the collector of triode T1, and R3 links to each other with the emitter of triode T1; The other end of R3 is connected in the control utmost point G of controllable silicon SCR, the negative electrode K of controllable silicon SCR is connected with R2, R4 and green LED are connected on the anode A of controllable silicon SCR, capacitor C is in parallel with warning musical film and warning indicating circuit, the collector of triode T2 links to each other with Yang Sheng device lower end, and the base stage of triode T2 links to each other with warning musical film IC, and the emitter of triode T2 links to each other with positive source, the A point is connected in the base stage of triode T1, and the B point is connected in the middle of R4 and the green LED.

The fluctuation of supply voltage when capacitor C can suppress musical film work.

It is first-class only fine enamelled wire need to be installed in door and window, kitchen cabinet, valuables external packing, farm cattle halter rope when deploying to ensure effective monitoring and control of illegal activities, the shelter that the alarm main frame is placed on the bedroom or is difficult for finding, and connect A, B 2 points, closed power switch.When 2 of A, B were continuous, green LED was at first by the R1 conducting, because the drop-down clamping action of LED, the A point voltage only be about 0.5V, can not make the T1 conducting, can not provide trigger voltage controllable silicon SCM also to be cut off to controllable silicon SCM, was in the warning armed state.When if the robber steals, enameled wire will be torn, after disconnecting between 2 of A, the B, the base potential of T1 raises, add a bias voltage between base stage and the emitter, thereby make T1 outer, and trigger the SCM conducting by R3 in conducting state, operating voltage is provided for the warning musical film, send the alarm sound music signal, the alarm sound music signal promotes the loudspeaker sounding after triode T2 amplifies, the warning phonation circuit, LED also indicates luminous simultaneously.According to characteristics of transistor, in case after the conducting, even short circuit enameled wire again, remove trigger voltage, also still can keep conducting state, unless just be added in the loss of voltage at its two ends or filled when wherein electric current reduces to certain certain value and can end, this has just realized auto-lock function.Wanting that compulsory commutation reports to the police can only cut-off switch K, otherwise chimes of doom will can be heard without end, thereby the property of having guaranteed you is safe and sound.

During making, entire circuit can be placed in the finished product doorbell shell, because of making full use of doorbell battery and loudspeaker and their installation site, not only save trouble but also beautiful, K switch is installed in the housing face-plate correct position, 2 of A, B draw with lead and note mutually insulated, and the trigger of warning musical film IC will reliably link to each other with positive source, guarantee the energising sounding of just working.

Claims

1. family expenses broken string burglar alarm is characterized in that warning indicating circuit that warning phonation circuit that it comprises that the electronics self-lock switch circuit, warning musical film IC, T2, the loudspeaker BL that are made of resistance R 1, R2, R3, triode T1, unidirectional controllable silicon S CR constitute and resistance R 4, green emitting two utmost point LED constitute and capacitor C, K switch, power supply, A, B two wiring points; R1 links to each other with the base stage of triode T1, and R2 links to each other with the collector of triode T1, and R3 links to each other with the emitter of triode T1; The other end of R3 is connected in the control utmost point g of controllable silicon SCR, the negative electrode k of controllable silicon SCR is connected with R2, R4 and green LED are connected on the anode a of controllable silicon SCR, capacitor C is in parallel with warning musical film and warning indicating circuit, the collector of triode T2 links to each other with Yang Sheng device lower end, and the base stage of triode T2 links to each other with warning musical film IC, and the emitter of triode T2 links to each other with positive source, the A point is connected in the base stage of triode T1, and the B point is connected in the middle of R4 and the green LED.