CN202171851U

CN202171851U - Antitheft alarm device

Info

Publication number: CN202171851U
Application number: CN2011202786078U
Authority: CN
Inventors: 田昊
Original assignee: TIANJIN YATIE TECHNOLOGY TRADE Co Ltd
Current assignee: TIANJIN YATIE TECHNOLOGY TRADE Co Ltd
Priority date: 2011-08-02
Filing date: 2011-08-02
Publication date: 2012-03-21
Anticipated expiration: 2021-08-02

Abstract

The utility model provides an antitheft alarm device, comprising a sensor, a shell, a power supply circuit, a first amplification circuit, an acousto-optic alarm circuit and an external circuit; wherein, the acousto-optic alarm circuit comprises a second amplification circuit, a loudspeaker, an LED lamp and a music chip. The beneficial effects of the utility model are that the sensor is plugged with an exterior terminal, being convenient in connection; and at the same time, via the current-limiting of a resistor, the current is limited below 0.03 milliampere, thereby achieving the energy saving purpose.

Description

Burglar alarm

Technical field

The utility model belongs to the warning device field, especially relates to a kind of anti-theft device that is used for the market articles of price.

Background technology

Traditional commodity displaying method is that commodity are placed on sales counter the inside, inconvenient client's viewing experience in the market.Have increasing businessman to adopt open shelf now, make things convenient for customers and watch, businessman is employed in the mode that connects anti-theft device on the commodity at present more and more and guards against theft in order to prevent that commodity are stolen.Because some anti-theft device circuit more complicated, it is pretty troublesome to deploy troops on garrison duty for the more frequent commodity of replacing, uses inconvenient.And it is too complicated that the antitheft circuit is arranged, energy consumption is also bigger, increases the day-to-day operations cost.

Summary of the invention

The purpose of the utility model provides a kind of easy to connect, energy-conservation burglar alarm, especially is suitable for the displaying of market articles of price.

The technical scheme of the utility model is: a kind of burglar alarm, comprise sensor, shell and circuit part, and circuit part comprises power circuit, first amplifying circuit, sound light alarming circuit and external circuits, wherein:

Power circuit comprises power supply, power cathode ground connection, the anodal K switch 1 that connects;

First amplifying circuit comprises the 4th triode Q4 and the 3rd triode Q3, and the emitter of the 4th triode Q4 is connected with the base stage of the 3rd triode Q3, and the collector of the 4th triode Q4 all is connected with autotransformer L2 one end with the collector of the 3rd triode Q3;

External circuits comprises external terminal K2; 2 mouthfuls of external terminal K2 are connected connecting line that external terminal K2 and K switch are 1 and the negative pole of diode D2, the positive pole of diode D2 and capacitor C 1 with an end of K switch 1; Capacitor C 1 is connected resistance R 1 ground connection with resistance R 1 order; Sensor is connected with external terminal K2, wherein:

Described sound light alarming circuit comprises second amplifying circuit, loudspeaker, LED lamp D3 and Music Clip U1; 1 mouthful of base stage with resistance R 2, the second triode Q2 of external terminal K2 is connected successively; The emitter of the second triode Q2 is connected with the base stage of the first triode Q1; The collector of the collector of the second triode Q2 and the first triode Q1 all is connected with 3 mouthfuls or 4 mouthfuls of Music Clip U1, and the emitter of the first triode Q1 is connected with 1 end of loudspeaker;

Loudspeaker is connected with LED lamp D3, resistance R 5 successively, and the loudspeaker other end is connected with the adjustable side of autotransformer L2, the other end ground connection of resistance R 5;

Resistance R 3 one end ground connection, the other end and R2 are connected with connecting line between external terminal K2;

1 mouthful of ground connection of Music Clip U1.

Advantage and the good effect that the utlity model has are: sensor and external terminal are pegged graft, and be easy to connect; Simultaneously, through the current limliting of resistance R 2, R3, electric current is limited in below the 0.03mA, simultaneously the required drive current of FET Q1 grid is very little, and this FET can drive loudspeaker and LED lamp, thereby reaches purpose of energy saving.

Description of drawings

Fig. 1 is the circuit diagram of the utility model.

Among the figure:

1, power circuit 2, first amplifying circuit 3, second amplifying circuit

4, external circuits

Embodiment

Below in conjunction with accompanying drawing specific descriptions are done in a preferred embodiment of the utility model, as shown in Figure 1, a kind of burglar alarm of the utility model comprises sensor, shell, power circuit 1, first amplifying circuit 2, sound light alarming circuit and external circuits 4.

Power circuit 1 comprises electric battery and K switch 1, and electric battery is made up of the battery of the 3V800mAH of two joint series connection, the electric battery minus earth, and positive pole is connected with an end of K switch 1, the break-make of the whole device circuit of K switch 1 control.

First amplifying circuit 2 comprises the 4th triode Q4 and the 3rd triode Q3; The emitter of the 4th triode Q4 is connected with the base stage of the 3rd triode Q3; The collector of the 4th triode Q4 all is connected with autotransformer L2 one end with the collector of the 3rd triode Q3; Wherein, Q4 is S9014, and Q3 is S8050.

External circuits 4 comprises external terminal K2; 2 mouthfuls of external terminal K2 are connected with K switch 1, connecting line that external terminal K2 and K switch are 1 and the negative pole of diode D2, and the positive pole of diode D2 is connected with capacitor C 1, resistance R 1 successively; Resistance R 1 ground connection; Wherein resistance R 1 is 1K Ω, and C1 is 10uF, and D2 is 1N4148.

Sound light alarming circuit comprises second amplifying circuit 3, loudspeaker, LED lamp D3 and Music Clip U1; 1 mouthful of base stage with resistance R 2, the second triode Q2 of external terminal K2 is connected successively; The emitter of the second triode Q2 is connected with the base stage of the first triode Q1, and the collector of the collector of the second triode Q2 and the first triode Q1 all is connected with 3 mouthfuls or 4 mouthfuls of Music Clip U1, and the emitter of the first triode Q1 is connected with loudspeaker; Wherein, The R2 resistance is 1K Ω, and Q2 is S8550, and Q1 is SI2301.

Loudspeaker is connected with LED lamp D3, resistance R 5 successively, and the loudspeaker other end is connected with the adjustable side of autotransformer L2, the other end ground connection of resistance R 5, and the resistance of resistance R 5 is 560 Ω.

Resistance R 3 one end ground connection, the other end and R2 are connected with connecting line between external terminal K2, and R2 and R3 have reached the effect of shunting, have limited the size of electric current.1 mouthful of ground connection of Music Clip U1.

Sensor is connected with external terminal K2, and sensor, external terminal, Music Clip U1 and diode D2 form the signal conductive loop.

Through the metering function of R2, R3, below 0.03mA, still the enlargement factor of the second triode Q28550 is between 80～120 times with Current Control; Therefore, driving force is not enough, can not drive powerful device; Therefore; Increased MOSFET FET Q1 (SI2301), the required drive current of Q1 grid is very little, can drive loudspeaker and LED lamp.

The course of work of the utility model: open K switch 1, internal circuit forms and is communicated with.Sensor is connected with external terminal K2, and sensor is connected with the commodity that need protection.Sensor, external terminal, Music Clip U1 and diode D2 form the signal conductive loop; Music Clip U1 continues to send electric signal; In sensor, external terminal, Music Clip U1 and diode D2 form the signal conductive loop, transmit, when sensor separated with commodity, this loop forms opened circuit; Then Music Clip U1 control loudspeaker and LED lamp D3 are acoustic luminous, remind the staff.

More than the embodiment of the utility model is specified, but said content is merely the preferred embodiment of the utility model, can not be considered to be used to limit the practical range of the utility model.All equalizations of doing according to the utility model application range change and improve etc., all should still belong within the patent covering scope of the utility model.

Claims

1. a burglar alarm comprises sensor, shell and circuit part, and circuit part comprises power circuit (1), first amplifying circuit (2), sound light alarming circuit and external circuits (4), wherein:

Power circuit (1) comprises power supply, power cathode ground connection, the anodal switch (K1) that connects;

First amplifying circuit (2) comprises the 4th triode (Q4) and the 3rd triode (Q3); The emitter of the 4th triode (Q4) is connected with the base stage of the 3rd triode (Q3), and the collector of the 4th triode (Q4) all is connected with autotransformer (L2) end with the collector of the 3rd triode (Q3);

External circuits (4) comprises external terminal (K2); 2 mouthfuls of ends with switch (K1) of external terminal (K2) are connected; The connecting line between external terminal (K2) and switch (K1) and the negative pole of diode (D2); The positive pole of diode (D2) and electric capacity (C1), electric capacity (C1) is connected resistance (R1) ground connection with resistance (R1) order; Sensor is connected with external terminal (K2), it is characterized in that:

Described sound light alarming circuit comprises second amplifying circuit (3), loudspeaker, LED lamp (D3) and Music Clip (U1); 1 mouthful of base stage with resistance (R2), second triode (Q2) of external terminal (K2) is connected successively; The emitter of second triode (Q2) is connected with the base stage of first triode (Q1); The collector of the collector of second triode (Q2) and first triode (Q1) all is connected with 3 mouthfuls or 4 mouthfuls of Music Clip (U1), and the emitter of first triode (Q1) is connected with 1 end of loudspeaker;

Loudspeaker is connected with LED lamp (D3), resistance (R5) successively, and the loudspeaker other end is connected with the adjustable side of autotransformer (L2), the other end ground connection of resistance (R5);

Resistance (R3) end ground connection, the other end and (R2) are connected with connecting line between external terminal (K2);

1 mouthful of ground connection of Music Clip (U1).