CN106355803A - Antitheft circuit - Google Patents
Antitheft circuit Download PDFInfo
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- CN106355803A CN106355803A CN201610911528.3A CN201610911528A CN106355803A CN 106355803 A CN106355803 A CN 106355803A CN 201610911528 A CN201610911528 A CN 201610911528A CN 106355803 A CN106355803 A CN 106355803A
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- signal
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- circuit
- npn transistor
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
- G08B13/1672—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using sonic detecting means, e.g. a microphone operating in the audio frequency range
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The invention discloses an antitheft circuit. The antitheft circuit comprises a sound sensor, an amplification module, a signal comparison module, a signal conversion unit, a ringing circuit and an LED lamp luminous circuit, wherein the sound sensor receives ambient sound variation and converts the ambient sound variation to an electric signal to be transmitted to the amplification module; the amplification module filters and amplifies the electric signal of the sound sensor and then transmits to the signal comparison module; the signal comparison module compares the signal transmitted by the amplification module with a preset value and outputs a level signal; the signal conversion unit receives the level signal and outputs a ringing control signal and an LED lamp control signal; the ringing circuit receives the ringing control signal to realize a ringing function; the LED lamp luminous circuit receives the LED lamp control signal and realizes a function of turning on an LED lamp. The antitheft circuit is simple in structure, short in response time, convenient for adjusting the induction sensitivity and adaptable to different working environments.
Description
Technical field
The present invention relates to smart home field, particularly to a kind of anti-theft circuit.
Background technology
With the development of electronic technology, especially single-chip microcomputer civil area widely use and wireless technology development,
Make the function of the antitheft combination unit of smart home also stronger and stronger, the antitheft combination unit of smart home also almost becomes every family
The first antitheft selection at family.The digit chip in integrated circuit is almost all employ, digit chip becomes in acoustic control anti-theft circuit
This is high, and needs the program in chip is modified adjusting when sound sensitive is spent, complex operation.
Content of the invention
The goal of the invention of the present invention is: solves complex structure in intelligent anti-theft circuit, response time is long, adjusts sensing quick
Sensitivity inconvenience is it is impossible to adapt to the problem of different operating environment.
To achieve these goals, the technical solution used in the present invention is:
A kind of anti-theft circuit, comprising:
Sound transducer: environment of accepting sound variation is converted into electric signal transmission to amplification module；
Amplification module: be transferred to signal comparison module by after the signal of telecommunication filter and amplification of sound transducer；
Signal comparison module: the signal that amplification module is transmitted and preset value are compared, outputs level signals；
Signal conversion unit: incoming level signal, the control signal of output ring control signal and LED lamp；
Ringing circuit: receive ring control signal, realize ringer function；
LED lamp illuminating circuit: receive the control signal of LED lamp, that realizes LED lamp lights function.
Further scheme is: sound transducer uses Electret condenser microphone.
Further scheme is:: amplification module includes the second amplifying circuit that two npn double pole triodes are constituted；
Signal comparison module includes the comparator using integrated transporting discharging, and the positive input terminal of integrated transporting discharging is with amplification module outfan even
Connect, the positive input terminal of integrated transporting discharging is connected by rheostat with comparator output terminal；The negative input end of integrated transporting discharging with defeated
Go out and connected by the contrary Zener diode of both direction between end.
Further scheme is: signal conversion unit adopts single-chip microcomputer, and model is chosen as stc89c81.
Further scheme is: ringing circuit includes chip u1, swept resistance r15, power supply vcc2, ring lb, npn crystalline substance
Body pipe q3 and npn transistor q4, chip u1 select 555 intervalometers, and 7 feet of chip u1 connect the emitter stage of npn transistor q3,
The colelctor electrode of npn transistor q3 connects power supply vcc2, and the ground level of npn transistor q3 connects 39 feet of single-chip microcomputer, 7 feet of chip u1
It is also associated with resistance r16, the other end of resistance r16 connects one end of swept resistance r15, the other end of swept resistance r15 connects
There are electric capacity c9, the other end ground connection of electric capacity c9, draw the second branch road between swept resistance r15 and electric capacity c9 junction point and connect chip
2 feet of u1 and 6 feet, the 1 foot ground connection of chip u1,4 feet of chip u1 and 8 feet connect power supply vcc2, and 3 feet of chip u1 connect ring
One end of lb, the other end ground connection of ring lb, 3 feet of chip u1 are also associated with inductance l1 and electric capacity c8, inductance l1 and electric capacity c8
The other end ground connection.
Further scheme is: LED lamp illuminating circuit includes led1, npn transistor q4, and the anode of led1 connects power supply
The negative electrode of vcc2, led1 connects the colelctor electrode of npn transistor q4, and the ground level of npn transistor q4 connects 34 feet of single-chip microcomputer, npn
It is grounded after the emitter stage of transistor q4 also series resistance r17.
In sum, due to employing technique scheme, the invention has the beneficial effects as follows:
Originally it is that inventive structure is simple, response time is short, adjust sensing sensitivity conveniently, adapt to different operating environment.Sound
Sound sensor environment of accepting sound variation is converted into the signal of telecommunication and amplifies through amplification module, comparison module discharge interference, passes
Pass single-chip microcomputer, signal is changed to 555 intervalometers by single-chip microcomputer, and 555 intervalometers produce audio frequency concussion, and buzzer sends chimes of doom
Sound.
Brief description
Fig. 1 is sound transducer, amplification module and signal comparison module circuit theory diagrams.
Fig. 2 is the circuit theory diagrams of signal conversion unit, ringing circuit and LED lamp illuminating circuit.
Specific embodiment
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, not
For limiting the present invention.
Embodiment 1
As Fig. 2, signal conversion unit adopts single-chip microcomputer, and model is chosen as stc89c81.
Further scheme is: ringing circuit includes chip u1, swept resistance r15, power supply vcc2, ring lb, npn crystalline substance
Body pipe q3 and npn transistor q4, chip u1 select 555 intervalometers, and 7 feet of chip u1 connect the emitter stage of npn transistor q3,
The colelctor electrode of npn transistor q3 connects power supply vcc2, and the ground level of npn transistor q3 connects 39 feet of single-chip microcomputer, 7 feet of chip u1
It is also associated with resistance r16, the other end of resistance r16 connects one end of swept resistance r15, the other end of swept resistance r15 connects
There are electric capacity c9, the other end ground connection of electric capacity c9, draw the second branch road between swept resistance r15 and electric capacity c9 junction point and connect chip
2 feet of u1 and 6 feet, the 1 foot ground connection of chip u1,4 feet of chip u1 and 8 feet connect power supply vcc2, and 3 feet of chip u1 connect ring
One end of lb, the other end ground connection of ring lb, 3 feet of chip u1 are also associated with inductance l1 and electric capacity c8, inductance l1 and electric capacity c8
The other end ground connection.
Further scheme is: LED lamp illuminating circuit includes led1, npn transistor q4, and the anode of led1 connects power supply
The negative electrode of vcc2, led1 connects the colelctor electrode of npn transistor q4, and the ground level of npn transistor q4 connects 34 feet of single-chip microcomputer, npn
It is grounded after the emitter stage of transistor q4 also series resistance r17.
As Fig. 1, Electret condenser microphone is connected with the base stage of Npn triode q1 by electric capacity c1, and Electret condenser microphone m21 passes through electricity
Resistance r1 is connected with vcc, and the base stage of audion q1 is connected with vcc by resistance r2, the colelctor electrode of audion q1 by resistance r3 and
Vcc connects, and the base stage of audion q1 is grounded by resistance r5, and the emitter stage of audion q1 is sequentially connected resistance r6 and r7 ground connection,
Resistance r6 is parallel with electric capacity c4, and the colelctor electrode of audion q1 is connected with the base stage of audion q2, and the colelctor electrode of audion q2 passes through
Resistance r4 is connected to vcc, and the other end of resistance r4 passes through polar capacitor c6 and electric capacity c5 ground connection respectively, and resistance r4 is parallel with electric capacity
The emitter stage of c2, audion q2 passes sequentially through electric capacity c3 and resistance r10 and is connected to the positive input terminal of integrated transporting discharging u1a, electric capacity c3
Resistance r8 and resistance r9 ground connection is passed through at two ends respectively；The just defeated input of integrated transporting discharging u1a passes sequentially through resistance r12 and can power transformation
Resistance r13 is connected to circuit output end, is connected by resistance r14 between the outfan of integrated transporting discharging u1a and circuit output end, integrated
The negative input end of amplifier u1a passes sequentially through resistance r11, forward zener diode d1, reverse zener diode d2 are connected to circuit
Outfan, resistance r11 and Zener diode d1 junction ground connection；Outfan connects 1 foot of single-chip microcomputer.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (6)
1. a kind of anti-theft circuit is it is characterised in that include:
Sound transducer: environment of accepting sound variation is converted into electric signal transmission to amplification module；
Amplification module: be transferred to signal comparison module by after the signal of telecommunication filter and amplification of sound transducer；
Signal comparison module: the signal that amplification module is transmitted and preset value are compared, outputs level signals；
Signal conversion unit: incoming level signal, the control signal of output ring control signal and LED lamp；
Ringing circuit: receive ring control signal, realize ringer function；
LED lamp illuminating circuit: receive the control signal of LED lamp, that realizes LED lamp lights function.
2. as claimed in claim 1 a kind of anti-theft circuit it is characterised in that sound transducer uses Electret condenser microphone.
3. as claimed in claim 2 a kind of anti-theft circuit it is characterised in that: amplification module includes two npn double pole triodes
The second amplifying circuit constituting；Signal comparison module includes the comparator using integrated transporting discharging, the positive input terminal of integrated transporting discharging
It is connected with amplification module outfan, the positive input terminal of integrated transporting discharging is connected by rheostat with comparator output terminal；Integrated
Pass through the contrary Zener diode of both direction between the negative input end of amplifier and outfan to connect.
4. as claimed in claim 1 a kind of anti-theft circuit it is characterised in that signal conversion unit adopts single-chip microcomputer, model selects
For stc89c81.
5. as claimed in claim 4 a kind of anti-theft circuit it is characterised in that ringing circuit include chip u1, swept resistance r15,
Power supply vcc2, ring lb, npn transistor q3 and npn transistor q4, chip u1 selects 555 intervalometers, and 7 feet of chip u1 connect
The emitter stage of npn transistor q3, the colelctor electrode of npn transistor q3 connects power supply vcc2, and the ground level of npn transistor q3 connects monolithic
39 feet of machine, 7 feet of chip u1 are also associated with resistance r16, and the other end of resistance r16 connects one end of swept resistance r15, slide
The other end of resistance r15 is connected with electric capacity c9, and the other end ground connection of electric capacity c9, between swept resistance r15 and electric capacity c9 junction point
Draw 2 feet and 6 feet that the second branch road connects chip u1, the 1 foot ground connection of chip u1,4 feet of chip u1 and 8 feet connection power supply
3 feet of vcc2, chip u1 connect one end of ring lb, the other end ground connection of ring lb, and 3 feet of chip u1 are also associated with inductance l1
With electric capacity c8, the other end ground connection of inductance l1 and electric capacity c8.
6. as claimed in claim 5 a kind of anti-theft circuit it is characterised in that LED lamp illuminating circuit includes led1, npn transistor
The anode of q4, led1 connects power supply vcc2, and the negative electrode of led1 connects the colelctor electrode of npn transistor q4, the ground level of npn transistor q4
Connect 34 feet of single-chip microcomputer, be grounded after emitter stage also series resistance r17 of npn transistor q4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610911528.3A CN106355803A (en) | 2016-10-19 | 2016-10-19 | Antitheft circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610911528.3A CN106355803A (en) | 2016-10-19 | 2016-10-19 | Antitheft circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106355803A true CN106355803A (en) | 2017-01-25 |
Family
ID=57863385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610911528.3A Pending CN106355803A (en) | 2016-10-19 | 2016-10-19 | Antitheft circuit |
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| CN (1) | CN106355803A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508252A (en) * | 2017-02-24 | 2018-09-07 | 长沙英雁电子有限公司 | With detection and drive in the voltage sensor of one |
| CN109383366A (en) * | 2018-12-20 | 2019-02-26 | 李明雨 | A kind of galloping early warning system and pre-warning and control method |
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| CN2177265Y (en) * | 1993-12-03 | 1994-09-14 | 常熟市华中电器厂 | Sound control anti-theft alarm and door bell multipurpose device |
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| CN202306730U (en) * | 2011-10-01 | 2012-07-04 | 伊川县电业局 | Anti-theft alarm device of power equipment of transformer substation |
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2016
- 2016-10-19 CN CN201610911528.3A patent/CN106355803A/en active Pending
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| CN2159557Y (en) * | 1992-10-06 | 1994-03-23 | 李须真 | Electronic clinical thermometer/pulse-meter |
| CN2177265Y (en) * | 1993-12-03 | 1994-09-14 | 常熟市华中电器厂 | Sound control anti-theft alarm and door bell multipurpose device |
| CN2715264Y (en) * | 2004-04-09 | 2005-08-03 | 张云祥 | Multifunctional alarm |
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| CN203786851U (en) * | 2014-04-28 | 2014-08-20 | 王星阳 | Novel pickup alarm |
| US20160093178A1 (en) * | 2014-09-30 | 2016-03-31 | Tyco Fire & Security Gmbh | Wireless acoustic glass breakage detectors |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508252A (en) * | 2017-02-24 | 2018-09-07 | 长沙英雁电子有限公司 | With detection and drive in the voltage sensor of one |
| CN109383366A (en) * | 2018-12-20 | 2019-02-26 | 李明雨 | A kind of galloping early warning system and pre-warning and control method |
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20170125 |