CN2037085U

CN2037085U - Anti-theft warner

Info

Publication number: CN2037085U
Application number: CN 88215104
Authority: CN
Inventors: 容敦善; 何敢敬; 杨林
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-10-20
Filing date: 1988-10-20
Publication date: 1989-05-03

Abstract

The utility model discloses an anti-theft warner, composed of a direct-current power supply, a control switch, a triggering circuit, a delay circuit, a warning circuit, a power amplifying circuit and a loudspeaker. The anti-theft warner uses a key switch to control the operating state of the warner and can give out the warning sounds of the fire engine and the police engine two types, having simple structure, low cost and strong anti-interference ability. Although the external control circuit of the warner is broken, the warner can also be continueous to give out the warning sounds, being suitable for enterprises, schools, banks, shops, the enterprises and institutions of the factories and mines, urban dwellers and rural residences.

Description

Anti-theft warner

The utility model relates to a kind of burglar alarm.

The useful contact-making switch control of existing burglar alarm, useful cipher control, useful infrared electro control, also useful main frame and the machine of paying two cover independent parts jointly control.Burglar alarm with contact-making switch control is easy to be destroyed by the robber, is accepted by the lower people of educational level with the difficult again of cipher control, and mysterious and relieved inadequately sensation is always arranged.With infrared electro control and jointly control with main, the machine of paying, again because structure and make all complicatedly, price is higher, is difficult for being adopted by masses.

It is a kind of simple in structure, popular that task of the present utility model will provide, and is fit to people's applied mental, the warning device of reliable operation, good anti-theft effect.

Task of the present utility model is finished like this: make power supply with dry cell, key gauge tap (lock-controlled switch) and magnetic switch that gauge tap adopts people to use always constitute jointly, lock-controlled switch is a contact switch that has key, it is as the master switch of energized, magnetic switch is as the alarm switch that makes the warning system action, trigger circuit are made up of magnetic switch and controllable silicon, with the core parts of KD9561 four tones of standard Chinese pronunciation warning special IC as alarm sound sounding alarm circuit, the sound signal that it produces, behind the complex pipe power amplifier, send two kinds of alarm sounds by loudspeaker, from applying powerful pressure to the robber mentally and sensuously.

Be elaborated below in conjunction with embodiment and accompanying drawing.

Fig. 1 is the structured flowchart of burglar alarm of the present utility model, and Fig. 2 is the electrical schematic diagram according to a kind of burglar alarm of the utility model design.

With reference to Fig. 1, the utility model is made up of power supply, gauge tap, trigger circuit, delay circuit, warning circuit, power amplifier and loudspeaker.Power supply is a direct supply, fills the post of with dry cell.Delay circuit is in order to the switching time of control alarm sound type.Power amplifier is in order to amplify the sound signal strength that warning circuit provides, so that from the enough big alarm sound of loudspeaker output.

In Fig. 2, R1, R2 and controllable silicon CR and magnetic switch K2 form thyristor gating circuit; R3, R4, R5, C1 and BG1 form delay circuit; KD9561 type four tones of standard Chinese pronunciation warning special IC IC and peripheral cell D1, C2, R6, R7 form warning circuit, and wherein R6 is in order to regulate the oscillation frequency of IC, and C2, R7 provide suitable operating voltage for IC; BG2 and BG3 form power amplifier.

During use, lock-controlled switch K1 is installed on the gate, can installs side by side,, lock-controlled switch is opened (lock-controlled switch being placed make-position) with energized so that the layman gos out with on the gate lock time with the built-in lock on the gate.On the door and window that magnetic switch K2 may pass through when being installed in the robber and invading (be installed in the robber can mobile furniture or article on), door, window are shut, make K2 place closure state, at this moment, supply voltage is through R1, K2 and ground short circuit, and controllable silicon can not trigger, and circuit is in the preliminary work state, because resistance R 1 resistance is very big, the short-circuit current of this moment is extremely small.When robber's desire is invaded the indoor door that magnetic switch K2 will be housed or window when opening, K2 disconnects, supply voltage is through R1, R2 triggers the controllable silicon conducting, circuit enters alarm condition, at this moment, DC voltage is charged to C1 by R3, this moment, BG1 ended, the collector of BG1 is in noble potential, diode D conducting, 2 pin of integrated circuit (IC) are noble potential, by 7 pin output fire truck alarm sound signal, this signal is through BG2, the BG3 complex pipe carries out sending loud fire truck alarm song by loudspeaker y after the power amplification, approximately through 3-5 second, along with the rising of capacitor C1 charging voltage, BG1 is by by becoming conducting, the collector of BG1 becomes electronegative potential by original noble potential, diode D ends, and the current potential of 2 pin of IC becomes 0 by original noble potential, at this moment, warning circuit output police car sound signal is through the alarm song when loudspeaker sends loud police car and executes the task behind the power amplifier.After this, warning circuit will maintain the duty of sending police car sound signal, until turn off K switch 1(with key K1 be disconnected), till cutting off the electricity supply.If reopen lock-controlled switch K1, said process can carry out again again.

The utility model is because based on new design philosophy, thereby it has following advantages:

1, trigger current is less than 20 microamperes, thereby the long service life of dry battery power, and the new battery of every transducer set can use more than 1 year continuously.

2, owing to can send in succession two types alarm sound, thereby feeling of terror and the tension of the alarm song that sends of this alarm are very strong, have greatly improved anti-theft effect.

3, adopt the duty of mechanical type lock control switch pre-set alarm, thereby simply, conveniently, reliably, relatively meet people's use habit, be easy to accept, adopt for users.

4, the antijamming capability of circuit is strong, is not subjected to the restriction of any mounting condition, no false triggering phenomenon.

5, simple in structure, low cost of manufacture, easy to utilize.

Claims

1, a kind of burglar alarm, it is made up of power supply, gauge tap, trigger circuit, delay circuit, warning circuit, power amplifier and loudspeaker, it is characterized in that: gauge tap comprises lock-controlled switch and magnetic switch, lock-controlled switch is made master switch, magnetic switch is made alarm switch, trigger circuit are made up of magnetic switch and controllable silicon, and warning circuit is made up of warning special IC and peripheral cell thereof.

2, burglar alarm according to claim 1 is characterized in that: lock-controlled switch is the contact switch of a band key.

3, burglar alarm according to claim 1 is characterized in that: the warning special IC is a KD9561 type four tones of standard Chinese pronunciation warning special IC, and it can make loudspeaker produce the alarm sound signal of fire truck and police car.