CN201974894U - Anti-theft alarm circuit - Google Patents

Anti-theft alarm circuit Download PDF

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Publication number
CN201974894U
CN201974894U CN2011200766421U CN201120076642U CN201974894U CN 201974894 U CN201974894 U CN 201974894U CN 2011200766421 U CN2011200766421 U CN 2011200766421U CN 201120076642 U CN201120076642 U CN 201120076642U CN 201974894 U CN201974894 U CN 201974894U
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CN
China
Prior art keywords
circuit
trigger
alarm
warning circuit
signal
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Expired - Fee Related
Application number
CN2011200766421U
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Chinese (zh)
Inventor
聂海燕
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Zibo Vocational Institute
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Zibo Vocational Institute
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Priority to CN2011200766421U priority Critical patent/CN201974894U/en
Application granted granted Critical
Publication of CN201974894U publication Critical patent/CN201974894U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses an anti-theft alarm circuit, which is mainly designed for providing a simple and economical anti-theft alarm circuit. The anti-theft alarm circuit comprises a trigger circuit, a monostable trigger, a conduction circuit and an alarm whistle alarm circuit, wherein the trigger circuit is used for monitoring a monitoring signal inputted from an external equipment in a real-time manner and outputting a trigger signal; the monostable trigger is used for receiving the trigger signal inputted from the trigger circuit and outputting a high level or a low level according to the trigger signal; the conduction circuit is used for receiving a level signal outputted from the monostable trigger; a high level is used for conducting and communicating with a loop formed together with the alarm whistle alarm circuit; a low level is used for cutting off a loop formed together with the alarm whistle alarm circuit; and the alarm whistle alarm circuit is used for outputting or stopping outputting the alarm signal to control a loudspeaker connected with the alarm signal output end of the alarm whistle alarm circuit to sound or stop sounding according to the on-off state of the conduction circuit.

Description

Anti-theft warning circuit
Technical field
The utility model relates to circuit field, relates in particular to a kind of anti-theft warning circuit.
Background technology
Existing burglar alarm kind is a lot, and the mechanical electronic type that also has is arranged.Burglar alarm for electronic type mainly contains microwave and infrared warning device, and wherein microwave alarm is subject to electromagnetic interference (EMI), causes wrong report easily, and its function singleness of existing infrared warning device, result of use is bad and cost is higher.
The utility model content
At the problems referred to above, the utility model provides anti-theft warning circuit a kind of simple in structure, economical and practical.
For achieving the above object, anti-theft warning circuit described in the utility model comprises: trigger circuit, monostalbe trigger, turning circuit and siren warning circuit; Wherein,
Described trigger circuit are monitored the monitor signal that external equipment is imported in real time, and according to this monitor signal output trigger pip;
Described monostalbe trigger receives the trigger pip that described trigger circuit are imported, and outwards exports high level or low level according to this trigger pip;
Turning circuit receives the level signal that monostalbe trigger is exported, the loop that the high level conducting is communicated with and described siren warning circuit constitutes, and low level is by the loop of cut-out with described siren warning circuit formation;
Described siren warning circuit according to the on off operating mode of described turning circuit, is exported or is stopped output alarm signal and ring or ring in the loudspeaker of described siren warning circuit alarm signal output ends with control linkage and stop.
Preferably, described trigger circuit constitute by touching the sheet metal and first electric capacity, and wherein, described touch sheet metal and described first capacitances in series also access to the low triggering end of described monostalbe trigger.
Preferably, described monostalbe trigger is made of time base circuit and external timing element.
Wherein, described external timing element comprises: first resistance, second resistance and second electric capacity; Wherein, described first resistance, one end links to each other with positive source, and the other end links to each other with described second resistance, and described second resistance inserts the high-triggering end of described time base circuit, and the high-triggering end of described time base circuit links to each other with discharge end.
Preferably, described turning circuit is the output terminal that a base stage is connected described time base circuit, and collector is connected described positive source, and emitter inserts the triode of described siren warning circuit.
Preferably, described siren warning circuit comprises: speech simulation circuit, audio power amplifying circuit and loudspeaker; Wherein,
Described speech simulation circuit, output audio drive signal after the forward voltage conducting of described monostalbe trigger;
Described audio power amplifying circuit receives the audio control signal that described speech simulation circuit is exported, and this audio control signal is amplified;
Described loudspeaker sends the alarm tone of ringing according to the amplification audio control signal that is received from described audio power amplifying circuit output.
The beneficial effects of the utility model are, easy realization simple in structure is reliable and stable, and cost is low is easy to use in enormous quantities.
Description of drawings
Fig. 1 is the circuit diagram of anti-theft warning circuit described in the utility model.
Embodiment
Below in conjunction with Figure of description the utility model is further described.
As shown in Figure 1, anti-theft warning circuit described in the utility model comprises: trigger circuit 10, monostalbe trigger 11, turning circuit 12 and siren warning circuit 13; Wherein,
Described trigger circuit 10 are monitored the monitor signal that external equipment is imported in real time, and according to this monitor signal output trigger pip;
Described monostalbe trigger 11 receives the trigger pip that described trigger circuit 10 are imported, and outwards exports high level or low level according to this trigger pip;
Turning circuit 12 receives the level signal that monostalbe trigger 11 is exported, the loop that the high level conducting is communicated with and described siren warning circuit 13 constitutes, and low level is by the loop of cut-out with described siren warning circuit 13 formations;
Described siren warning circuit 13 according to the on off operating mode of described turning circuit 12, is exported or is stopped output alarm signal and ring or ring in the loudspeaker of described siren warning circuit 13 alarm signal output ends with control linkage and stop.
Further, described trigger circuit 10 constitute by touching the sheet metal 101 and first electric capacity, and wherein, described touch sheet metal 101 and described first capacitances in series also access to the low triggering end of described monostalbe trigger 11.
Described monostalbe trigger 11 is made of time base circuit and external timing element; Wherein, described external timing element comprises: first resistance, second resistance and second electric capacity; Wherein, described first resistance, one end links to each other with positive source, and the other end links to each other with described second resistance, and described second resistance inserts the high-triggering end of described time base circuit, and the high-triggering end of described time base circuit links to each other with discharge end.
Described turning circuit 12 is the output terminal that a base stage is connected described time base circuit, and collector is connected described positive source, and emitter inserts the triode of described siren warning circuit.
Described siren warning circuit 13 comprises: speech simulation circuit, audio power amplifying circuit and loudspeaker 14; Wherein,
Described speech simulation circuit, output audio drive signal after the forward voltage conducting of described monostalbe trigger;
Described audio power amplifying circuit receives the audio control signal that described speech simulation circuit is exported, and this audio control signal is amplified;
Described loudspeaker 14 sends the alarm tone of ringing according to the amplification audio control signal that is received from described audio power amplifying circuit output.
Below in conjunction with a specific embodiment anti-theft warning circuit described in the utility model is further described.
Present embodiment, as shown in Figure 1, this circuit is made of trigger circuit 10, monostalbe trigger 11, turning circuit 12 and siren warning circuit 13.Wherein, described trigger circuit 10 are made of touch sheet metal M101 that is connected in series and capacitor C 3, and the other end of capacitor C 3 is connected with the low triggering end of time base circuit 555.Described monostalbe trigger is made of time base circuit 555, R1, R2 and C4, wherein, R1 one end links to each other with positive source, and the other end is connected with R2, the other end of R2 inserts the high-triggering end of described time base circuit 555, and the high-triggering end of described time base circuit links to each other with discharge end.Described turning circuit 12 is a triode BG, and its collector links to each other with the positive pole of power supply, and its base stage links to each other through the output terminal of resistance R 3 with time base circuit 555, and its emitter inserts among the four sound simulation integrated circuit KD-9561 through resistance R 5.Described siren warning circuit 13 is made of speech simulation circuit, audio power amplifying circuit and loudspeaker 14, wherein, speech simulation circuit described in the present embodiment is made of four sound simulation integrated circuit KD-9561, resistance R 4 and resistance R 6, and described audio power amplifying circuit is the TWH8751 chip.Be connected with a resistance R 4 between 7 and 8 pins of four sound simulation integrated circuit KD-9561, its output pin 3 accesses in the TWH8751 chip through resistance resistance R 6, be connected with described loudspeaker 14 between 1 and 4 pins of this TWH8751 chip, this TWH8751 chip is a power switch circuit, to amplify audio power, make the warning police whistle sound louder.
The principle of work of the described circuit of present embodiment is: when hand touches touch sheet metal M, this touch sheet metal M produces pulse signal is input to time base circuit 555 after capacitor C 3 low triggering end (i.e. 2 pins), at this moment, circuit is temporary stable state, and by output pin (i.e. 3 pins) output high level.This high level makes triode BG conducting, from and the working power of back circuit is switched on.
Four sound simulation integrated circuit KD-9561 and R6, R4, TWH8751 and loudspeaker Y have formed the siren warning circuit.After the power circuit of KD-9561 chip is connected, its 3 pin will export the siren signal, through TWH8751 amplify back promotion loudspeaker send " toot " police whistle sound.After (time length is that R1, R2 and C4 decide by external timing element, and general tens seconds to a few minutes), time base circuit 555 changes stable state over to through after a while, the low level of its 3 pin pin output is ended the BG pipe, the electric power loop of its back is cut off, and quits work, and police whistle sound stops.After this, alarm is in the forecast state again.
In addition, explanation is arranged in your Disclosure of invention: this circuit is by monostalbe trigger, sound Compositions such as audio power amplifying circuit, touch sheet metal M, current rectifying and wave filtering circuit.Wherein, current rectifying and wave filtering circuit does not have demonstration in the diagram that you provide, and whether this current rectifying and wave filtering circuit forms the employed supply voltage of circuit described in the utility model with external power supply behind rectifying and wave-filtering.
More than; it only is preferred embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain that claim was defined.

Claims (6)

1. an anti-theft warning circuit is characterized in that, comprising: trigger circuit, monostalbe trigger, turning circuit and siren warning circuit; Wherein,
Described trigger circuit are monitored the monitor signal that external equipment is imported in real time, and according to this monitor signal output trigger pip;
Described monostalbe trigger receives the trigger pip that described trigger circuit are imported, and outwards exports high level or low level according to this trigger pip;
Turning circuit receives the level signal that monostalbe trigger is exported, the loop that the high level conducting is communicated with and described siren warning circuit constitutes, and low level is by the loop of cut-out with described siren warning circuit formation;
Described siren warning circuit according to the on off operating mode of described turning circuit, is exported or is stopped output alarm signal and ring or ring in the loudspeaker of described siren warning circuit alarm signal output ends with control linkage and stop.
2. according to the described anti-theft warning circuit of claim 1, it is characterized in that described trigger circuit constitute by touching the sheet metal and first electric capacity, wherein, described touch sheet metal and described first capacitances in series also access to the low triggering end of described monostalbe trigger.
3. according to the described anti-theft warning circuit of claim 1, it is characterized in that described monostalbe trigger is made of time base circuit and external timing element.
4. according to the described anti-theft warning circuit of claim 3, it is characterized in that described external timing element comprises: first resistance, second resistance and second electric capacity; Wherein, described first resistance, one end links to each other with positive source, and the other end links to each other with described second resistance, and described second resistance inserts the high-triggering end of described time base circuit, and the high-triggering end of described time base circuit links to each other with discharge end.
5. according to the described anti-theft warning circuit of claim 1, it is characterized in that described turning circuit is the output terminal that a base stage is connected described time base circuit, collector is connected described positive source, and emitter inserts the triode of described siren warning circuit.
6. according to the described anti-theft warning circuit of claim 1, it is characterized in that described siren warning circuit comprises: speech simulation circuit, audio power amplifying circuit and loudspeaker; Wherein,
Described speech simulation circuit, output audio drive signal after the forward voltage conducting of described monostalbe trigger;
Described audio power amplifying circuit receives the audio control signal that described speech simulation circuit is exported, and this audio control signal is amplified;
Described loudspeaker sends the alarm tone of ringing according to the amplification audio control signal that is received from described audio power amplifying circuit output.
CN2011200766421U 2011-03-22 2011-03-22 Anti-theft alarm circuit Expired - Fee Related CN201974894U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011200766421U CN201974894U (en) 2011-03-22 2011-03-22 Anti-theft alarm circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011200766421U CN201974894U (en) 2011-03-22 2011-03-22 Anti-theft alarm circuit

Publications (1)

Publication Number Publication Date
CN201974894U true CN201974894U (en) 2011-09-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011200766421U Expired - Fee Related CN201974894U (en) 2011-03-22 2011-03-22 Anti-theft alarm circuit

Country Status (1)

Country Link
CN (1) CN201974894U (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103186960A (en) * 2011-12-30 2013-07-03 海洋王照明科技股份有限公司 Touch control sound-light alarm circuit
CN103679995A (en) * 2013-11-26 2014-03-26 成都博盛信息技术有限公司 Multifunctional antitheft door
CN104036605A (en) * 2014-06-20 2014-09-10 吴昊 Touch burglar alarm
CN109035689A (en) * 2018-08-16 2018-12-18 无锡市人民医院 A kind of multi-functional doctors and nurses is self-defence to use emergency warning system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103186960A (en) * 2011-12-30 2013-07-03 海洋王照明科技股份有限公司 Touch control sound-light alarm circuit
CN103186960B (en) * 2011-12-30 2016-05-04 海洋王照明科技股份有限公司 Touch control sound light alarming circuit
CN103679995A (en) * 2013-11-26 2014-03-26 成都博盛信息技术有限公司 Multifunctional antitheft door
CN103679995B (en) * 2013-11-26 2015-10-28 成都博盛信息技术有限公司 A kind of Multifunctional safety door
CN104036605A (en) * 2014-06-20 2014-09-10 吴昊 Touch burglar alarm
CN109035689A (en) * 2018-08-16 2018-12-18 无锡市人民医院 A kind of multi-functional doctors and nurses is self-defence to use emergency warning system

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C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110914

Termination date: 20130322