CN201974894U - Anti-theft alarm circuit - Google Patents
Anti-theft alarm circuit Download PDFInfo
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- 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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- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 9
- 238000004088 simulation Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
Technical Field
The utility model relates to a circuit field especially relates to an anti-theft alarm circuit.
Background
The existing anti-theft alarm devices are various in types, and mechanical type and electronic type are available. The electronic anti-theft alarm device mainly comprises a microwave alarm device and an infrared alarm device, wherein the microwave alarm device is easy to be interfered by electromagnetic and easy to cause false alarm, and the existing infrared alarm device has single function, poor use effect and higher cost.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a simple structure, economical and practical's burglar alarm circuit.
In order to achieve the above object, the burglar alarm circuit comprises: the alarm device comprises a trigger circuit, a monostable trigger, a conducting circuit and an alarm whistle alarm circuit; wherein,
the trigger circuit monitors a monitoring signal input by the external equipment in real time and outputs a trigger signal according to the monitoring signal;
the monostable trigger receives a trigger signal input by the trigger circuit and outputs a high level or a low level outwards according to the trigger signal;
the conducting circuit receives a level signal output by the monostable trigger, the high level conducts and communicates a loop formed by the alarm whistle alarm circuit, and the low level cuts off the loop formed by the alarm whistle alarm circuit;
and the alarm whistle alarm circuit outputs or stops outputting an alarm signal according to the on-off state of the conducting circuit so as to control the sounding or the sounding stopping of a loudspeaker connected to the alarm signal output end of the alarm whistle alarm circuit.
Preferably, the trigger circuit is composed of a touch metal sheet and a first capacitor, wherein the touch metal sheet is connected in series with the first capacitor and is connected to a low trigger end of the monostable trigger.
Preferably, the monostable flip-flop is composed of a time base circuit and an external timing element.
Wherein the external timing element comprises: a first resistor, a second resistor and a second capacitor; one end of the first resistor is connected with the positive electrode of the power supply, the other end of the first resistor is connected with the second resistor, the second resistor is connected to the high trigger end of the time-base circuit, and the high trigger end of the time-base circuit is connected with the discharge end.
Preferably, the conducting circuit is a triode with a base connected to the output end of the time base circuit, a collector connected to the positive electrode of the power supply, and an emitter connected to the siren alarm circuit.
Preferably, the siren alarm circuit comprises: the device comprises a sound analog circuit, an audio power amplifying circuit and a loudspeaker; wherein,
the sound simulation circuit is conducted by the conducting voltage of the monostable trigger and then outputs an audio driving signal;
the audio power amplifying circuit receives the audio control signal output by the sound simulation circuit and amplifies the audio control signal;
and the loudspeaker sends out a sounding alarm sound according to the amplified audio control signal output by the audio power amplifying circuit.
The beneficial effects of the utility model are that, simple structure easily realizes, and is reliable and stable, and uses in batches with low costs easily.
Drawings
Fig. 1 is a circuit diagram of the anti-theft alarm circuit of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings.
As shown in fig. 1, the anti-theft alarm circuit of the present invention comprises: the alarm device comprises a trigger circuit 10, a monostable trigger 11, a conducting circuit 12 and a siren alarm circuit 13; wherein,
the trigger circuit 10 monitors a monitoring signal input by the external device in real time and outputs a trigger signal according to the monitoring signal;
the monostable flip-flop 11 receives the trigger signal input by the trigger circuit 10, and outputs a high level or a low level outwards according to the trigger signal;
the conducting circuit 12 receives a level signal output by the monostable trigger 11, conducts and communicates a loop formed by the alarm whistle alarm circuit 13 at a high level, and cuts off the loop formed by the alarm whistle alarm circuit 13 at a low level;
the siren alarm circuit 13 outputs or stops outputting the alarm signal according to the on-off state of the conducting circuit 12 to control the sounding or the sounding stop of a loudspeaker connected to the alarm signal output end of the siren alarm circuit 13.
Further, the trigger circuit 10 is composed of a touch metal sheet 101 and a first capacitor, wherein the touch metal sheet 101 is connected in series with the first capacitor and connected to the low trigger end of the monostable trigger 11.
The monostable trigger 11 consists of a time base circuit and an external timing element; wherein the external timing element comprises: a first resistor, a second resistor and a second capacitor; one end of the first resistor is connected with the positive electrode of the power supply, the other end of the first resistor is connected with the second resistor, the second resistor is connected to the high trigger end of the time-base circuit, and the high trigger end of the time-base circuit is connected with the discharge end.
The conducting circuit 12 is a triode with a base connected to the output end of the time base circuit, a collector connected to the positive electrode of the power supply, and an emitter connected to the alarm whistle alarm circuit.
The siren alarm circuit 13 includes: a sound analog circuit, an audio power amplification circuit, and a speaker 14; wherein,
the sound simulation circuit is conducted by the conducting voltage of the monostable trigger and then outputs an audio driving signal;
the audio power amplifying circuit receives the audio control signal output by the sound simulation circuit and amplifies the audio control signal;
the speaker 14 emits an alarm sound according to the amplified audio control signal received from the audio power amplifier circuit.
The burglar alarm circuit of the present invention will be further described with reference to a specific embodiment.
In this embodiment, as shown in fig. 1, the circuit is composed of a trigger circuit 10, a monostable trigger 11, a conduction circuit 12, and a siren alarm circuit 13. The trigger circuit 10 is composed of a touch metal sheet M101 and a capacitor C3 connected in series, and the other end of the capacitor C3 is connected to the low trigger end of the time base circuit 555. The monostable trigger is composed of a time base circuit 555, R1, R2 and C4, wherein one end of the R1 is connected with the positive electrode of a power supply, the other end of the R1 is connected with the R2, the other end of the R2 is connected to the high trigger end of the time base circuit 555, and the high trigger end of the time base circuit is connected with the discharge end. The conducting circuit 12 is a triode BG, the collector of which is connected with the positive pole of the power supply, the base of which is connected with the output end of the time base circuit 555 through a resistor R3, and the emitter of which is connected into the four-sound analog integrated circuit KD-9561 through a resistor R5. The siren alarm circuit 13 is composed of a sound analog circuit, an audio power amplifying circuit and a loudspeaker 14, wherein the sound analog circuit in the embodiment is composed of a four-sound analog integrated circuit KD-9561, a resistor R4 and a resistor R6, and the audio power amplifying circuit is a TWH8751 chip. A resistor R4 is connected between pins 7 and 8 of the four-sound analog integrated circuit KD-9561, the output pin 3 of the four-sound analog integrated circuit is connected to a TWH8751 chip through a resistor R6, the loudspeaker 14 is connected between pins 1 and 4 of the TWH8751 chip, and the TWH8751 chip is a power switch integrated circuit to amplify audio power and make the alarm siren sound louder.
The working principle of the circuit in this embodiment is as follows: when a hand touches the touch metal sheet M, the touch metal sheet M generates a pulse signal, the pulse signal passes through the capacitor C3 and is input to the low trigger terminal (i.e., 2 pins) of the time-based circuit 555, at this time, the circuit is in a transient state, and an output pin (i.e., 3 pins) outputs a high level. This high level switches on the transistor BG, which in turn switches on the operating power supply of the following circuit.
The four-sound analog integrated circuit KD-9561, R6, R4, TWH8751 and the loudspeaker Y form a siren alarm circuit. When the power circuit of the KD-9561 chip is switched on, the 3 feet of the chip output a siren signal, and the siren signal is amplified by the TWH8751 and pushes the loudspeaker to send out a 'whine' siren sound. After a period of time (the time is determined by external timing elements, namely R1, R2 and C4, generally dozens of seconds to several minutes), the time base circuit 555 is switched to a steady state, the BG tube is cut off by the low level output by the 3 pin, the power circuit behind the BG tube is cut off, the BG tube stops working, and the siren sound stops. After that, the alarm is in the forecast state again.
In addition, your technical manual is explained in the book: the circuit consists of a monostable trigger and sound
The audio power amplifier circuit, touch sheetmetal M, rectifier filter circuit etc. constitute. The rectifier filter circuit is not shown in the diagram provided by you, and the rectifier filter circuit is not used for rectifying and filtering an external power supply to form the power supply voltage used by the circuit of the utility model.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (6)
1. An burglar alarm circuit, comprising: the alarm device comprises a trigger circuit, a monostable trigger, a conducting circuit and an alarm whistle alarm circuit; wherein,
the trigger circuit monitors a monitoring signal input by the external equipment in real time and outputs a trigger signal according to the monitoring signal;
the monostable trigger receives a trigger signal input by the trigger circuit and outputs a high level or a low level outwards according to the trigger signal;
the conducting circuit receives a level signal output by the monostable trigger, the high level conducts and communicates a loop formed by the alarm whistle alarm circuit, and the low level cuts off the loop formed by the alarm whistle alarm circuit;
and the alarm whistle alarm circuit outputs or stops outputting an alarm signal according to the on-off state of the conducting circuit so as to control the sounding or the sounding stopping of a loudspeaker connected to the alarm signal output end of the alarm whistle alarm circuit.
2. The burglar alarm circuit according to claim 1, wherein said trigger circuit is formed by a touch metal plate and a first capacitor, wherein said touch metal plate is connected in series with said first capacitor and connected to a low trigger terminal of said one-shot flip-flop.
3. The burglar alarm circuit according to claim 1, wherein said monostable trigger is constituted by a time base circuit and an external timing element.
4. The burglar alarm circuit of claim 3, wherein said external timing element comprises: a first resistor, a second resistor and a second capacitor; one end of the first resistor is connected with the positive electrode of the power supply, the other end of the first resistor is connected with the second resistor, the second resistor is connected to the high trigger end of the time-base circuit, and the high trigger end of the time-base circuit is connected with the discharge end.
5. The burglar alarm arrangement according to claim 1, wherein said conducting circuit is a transistor having a base connected to an output of said time base circuit, a collector connected to a positive terminal of said power supply, and an emitter connected to said siren alarm circuit.
6. The burglar alarm circuit according to claim 1, wherein said siren alarm circuit comprises: the device comprises a sound analog circuit, an audio power amplifying circuit and a loudspeaker; wherein,
the sound simulation circuit is conducted by the conducting voltage of the monostable trigger and then outputs an audio driving signal;
the audio power amplifying circuit receives the audio control signal output by the sound simulation circuit and amplifies the audio control signal;
and the loudspeaker sends out a sounding alarm sound according to the amplified audio control signal output by the audio power amplifying circuit.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN201974894U true CN201974894U (en) | 2011-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200766421U Expired - Fee Related CN201974894U (en) | 2011-03-22 | 2011-03-22 | Anti-theft alarm circuit |
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| CN (1) | CN201974894U (en) |
Cited By (5)
| 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 |
| CN110763373A (en) * | 2019-11-09 | 2020-02-07 | 深圳市欧利德仪器仪表有限公司 | Monitoring alarm circuit with protection and self-recovery functions |
-
2011
- 2011-03-22 CN CN2011200766421U patent/CN201974894U/en not_active Expired - Fee Related
Cited By (7)
| 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 |
| CN110763373A (en) * | 2019-11-09 | 2020-02-07 | 深圳市欧利德仪器仪表有限公司 | Monitoring alarm circuit with protection and self-recovery functions |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20130322 |