CN1057351A - Multi-function computer theft deterent alarm - Google Patents

Abstract

Multi-function computer theft deterent alarm, by time base single-shot trigger circuit, the time base delay circuit, monostable transistor switching circuit, control music-integrating block and echo integrated package.Has the delayed alarm of touch function, can be with the touch mode alarm sensor, be contained in outdoors, the person of passing by on one's way does not touch unintentionally can cause warning, and owner is inward swinging door at the fixed time, also do not report to the police, the shake-up of larceny must surpass owner then report to the police the time of opening the door, and refusing the robber in the door part, this alarm also can be realized instant alarming that valuables are moved, report to the police thereby constituted double-deck time, it also has, and prompting owner discrepancy is closed the door and the function of music door-bell.

Description

Multi-function computer theft deterent alarm

The present invention relates to burglar alarm, particularly a kind of collection touches, light-operated, delayed alarm and have magnetic control and report to the police the multi-function computer theft deterent alarm of music door-bell.

" alarm of eight way display radios protection " (90 years 3 phases) " solar energy radio electrical remote control alarm " many existing burglar alarms such as (89 years 7 phases) that " CYBERSPACE " published, sensor has the warning device that adopts magnetic control, cuts off variety of ways such as ray, infrared sensing, photoelectricity, touch, but circuit is complicated.In addition, enter prewarning area or touch alarm sensor in case various alarm is the people, report to the police immediately, owing to be triggered at any moment, prewarning area generally can only be located at indoor, and can't refuse the robber in the door part.If alarm sensor places outdoors, the person of passing by on one's way might inadvertent free report to the police, and owner also may trigger warning, inconvenience.

Task of the present invention be design a kind of have touch delayed alarm, light-operated delayed alarm, and have the warning device of magnetic control instant alarming and music door-bell function concurrently, alarm delay time is determined by owner.Its objective is and alarm sensor can be placed outdoors that owner's touch sensor is also opened door within the predetermined time, promptly do not report to the police, and the robber fails to open in the given time just warning of door.

Circuit theory of the present invention is referring to Fig. 1, by the time base single-shot trigger circuit (1) accept touch signal, the time base delay circuit (2) the control lag time, and output signal to transistor switching circuit (3), control loudspeaker (7) sounding.Other has light-operated circuit (4), base delay circuit (2) when accepting light signal and being defeated by, and the signal of magnetic control circuit (5) is defeated by transistor switching circuit (3), and other has music doorbell circuit (6) control loudspeaker sounding.

Fig. 2 is a circuit diagram of the present invention, time base single-shot trigger circuit with the time base delay circuit combine and just can realize touch and light-operated delayed alarm, but because the general stability of trigger circuit is bad, when being connected with other circuit, not under the triggering situation, the low level of output is subjected to circuit own and disturbs, and can influence the triggering capacitor C ₂Action, even this electric capacity may be punctured.In addition, the high level after the triggering is through R ₂Enter BG ₃, make its saturation conduction, IC ₂1 pin produce an electronegative potential, though delay circuit can work, also because of there being the problems referred to above, IC in addition ₂Capacitor C ₄Electric leakage property and voltage are excessive, can make self capacity C ₄Burn.While IC ₂1 pin insert light emitting diode D ₁, can form dividing potential drop, postpone capacitor C ₄Can not get enough voltage, IC ₂Do not overturn in inside.So this circuit is triggering output resistance R ₂The place, feedback regulation diode D in parallel ₂, under normal circumstances, can be because of IC ₁Output is subjected to BG in low level ₃Base voltage influence, and then bring disaster to the triggering capacitor C ₂Photosensitive warning circuit is connected on BG ₃Base stage on also can not influence the action of this circuit.Guarantee light emitting diode D simultaneously ₁And capacitor C ₄Obtain enough voltage.

Alarm generator can provide the warning of four kinds of alternative sounds.In normal condition, the IC of delay circuit ₂3 pin output high level, through resistance R ₆Make BG ₄Conducting, its collector produces low level, and and BG ₅Emitter connects, in addition IC ₃So the low level that output is not enough is BG ₅End BG ₆Can not get signal does not report to the police.As delay circuit IC ₂3 pin output low levels, BG ₄End BG ₅As diode current flow, produce and report to the police.This circuit has been save complicated audio oscillator circuit and other oscillatory circuit, can insert the electric signal of magnetic control warning or the electric signal of other sensing mode input comparatively simply.

Below in conjunction with embodiment the present invention is further described.

IC in the circuit of the present invention ₁, IC ₂Model is NE ₅₅₅, C ₃Be KD ₉₅₆₁, IC ₄Be KD ₉₃₀₀, the touch mode alarm sensor of described alarm need not by special element, only needs touching circuit IC ₁2 pin pass through C ₁The cartridge that dead bolt is blocked in connection gets final product.Pin behind the door, by dead bolt, the keyhole place has become touch sensing position A.With hand or by key, contact A, trigger circuit are accepted human body noise signal, IC ₁Enter transient state, IC ₁The output noble potential, BG ₃Conducting, light emitting diode D ₁Lamp is bright, IC ₂Be excited to start R ₅C ₄Control its time delay of T ₁, T ₁=1.1R ₅C ₄T ₁Set up by the user, generally be adjusted to 5-6 about second.When touching time T ₀＞T ₁The time, IC ₂Just export electronegative potential, make BG ₄End BG ₅Become diode, make IC ₃Output signal and conducting BG ₆Report to the police T ₀＜T ₁Then do not report to the police.

If no touch signal, but photosensitive tube BG ₁Be subjected to rayed, its collector is electronegative potential, BG ₂End BG ₃Conducting, IC ₂Still be excited to start, and delayed alarm.

Touch the purposes of delayed alarm: owner's time of opening the door is 3-4 second usually, and the person of passing by on one's way touches alarm unintentionally can not exceed this time, even and the thief has so-called skeleton key to open the door also can to exceed this time.If inward swinging door at the fixed time, then do not report to the police, surpass the schedule time door of not opening and then report to the police, chimes of doom can threaten the robber, also the warning acoustical generator can be caused on duty, guard personnel place, as the hotel information desk.

The purposes of light-operated delayed alarm: photosensitive tube is contained in the cartridge of lock, or in the shrinkage pool of cutting a hole on the doorframe, at closing time, door blocks cartridge or shrinkage pool naturally, open a photosensitive tube and be subjected to light, circuit enters the delay alert status, does not close the door above the schedule time and then reports to the police, close the door in the given time and do not report to the police, can remind owner to note coming in and going out and close the door.

This circuit is provided with magnetic control and reports to the police, and constitutes sensor by magnet and tongue tube CK, the no delayed-action of magnetic control warning, the position that can place window and need to touch instant alarming.Also be provided with music door-bell in addition, by knob AN, IC ₄And BG ₇Constitute.The circuit of doorbell is cut off, and also can not influence warning function.

The present invention is simple in structure, and cost is low, and diverse in function has constituted double-deck time and reported to the police, and to refuse the robber in the door part, in case the robber has key to enter the room smoothly, still has mobile instant alarming function, is fit to family, hotel guest-room 8 and office and uses.

Claims (2)

1, multi-function computer theft deterent alarm, by time base single-shot trigger circuit (1), the time base delay circuit (2), monostable transistor switching circuit (3), light-operated circuit (4), magnetic control circuit (5), audio generating circuit (6) constitutes, and it is characterized in that:

(1) 3 pin of IC1 in parallel by diode D2 and resistance R 2, the base stage with triode BG3 is connected again,

(2) 3 pin of IC2 are connected with the base stage of BG4, and the collector of BG4 is connected with the emitter of BG5, and the base stage of BG5 is connected with the output terminal of IC3, and collector is connected with the base stage of BG6.

2, by the described alarm of claim 1, it is characterized in that, the signal output part of trigger circuit (1) and light-operated circuit (4) with the time basic delay circuit (2) be connected, the signal output part of magnetic control circuit (5) is connected with transistor switching circuit (3).

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