CN102831744A - Disconnection type theft-proof alarm circuit diagram - Google Patents
Disconnection type theft-proof alarm circuit diagram Download PDFInfo
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- CN102831744A CN102831744A CN 201110160701 CN201110160701A CN102831744A CN 102831744 A CN102831744 A CN 102831744A CN 201110160701 CN201110160701 CN 201110160701 CN 201110160701 A CN201110160701 A CN 201110160701A CN 102831744 A CN102831744 A CN 102831744A
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- loudspeaker
- circuit diagram
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Abstract
The invention discloses a disconnection type theft-proof alarm circuit diagram, relating to the technical field of electronic circuits. The disconnection type theft-proof alarm circuit diagram comprises a power supply (E), a switch (S), resistors (R1-R2), capacitors (C1-C2), triodes (VT1-VT2) and a loudspeaker (BL), wherein a positive pole of the power supply (E) is connected with one end of the switch (S), the other end of the switch (S) is respectively connected with a positive pole of the capacitor (C2), an emitter of the triode (VT2) and one end of the resistor (R1), a negative pole of the capacitor (C2) is connected with a negative pole of the power supply (E), and a collector of the triode (VT2) is respectively connected with one end of the resistor (R2) and one end of the loudspeaker (BL). The disconnection type theft-proof alarm circuit diagram has a simple structure, is good in theft-proof performance, is stable, can accurately send an alarm signal to people and is easy to popularize and use.
Description
Technical field
The present invention relates to the electronic circuit technology field, be specifically related to a kind of break line type anti-theft warning circuit figure.
Background technology
At present, along with the raising of economic life level, people's economic asset more and more receives much concern.Often have the robbed or burgled phenomenon of economic asset, therefore for the sake of security, people just successively installation various burglar alarms.And existing alarm theftproof performance is poor, and unstable, therefore can not send alerting signal to people exactly.
Summary of the invention
The purpose of this invention is to provide a kind of break line type anti-theft warning circuit figure, its theftproof performance is good, and stable, can send alerting signal to people.
In order to solve the existing problem of background technology; The present invention adopts following technical scheme: it comprises power supply E, switch S, resistance R 1-R2, capacitor C 1-C2, triode VT1-VT2 and loudspeaker BL; The positive pole of power supply E is connected with an end of switch S; Its other end is connected with the positive pole of capacitor C 2, the emitter of triode VT2 and an end of resistance R 1 respectively; The negative pole of capacitor C 2 is connected with power supply E negative pole; The collector of triode VT2 is connected with an end of resistance R 2 and the end of loudspeaker BL respectively, and the other end of loudspeaker BL is connected with the negative pole of capacitor C 2, and the base stage of triode VT2 is connected with the collector of triode VT1; The base stage of triode VT1 is connected with the A end with the other end of resistance R 1, the positive pole of capacitor C 1 respectively, and the emitter of triode VT1 is connected with the B end with the negative pole of capacitor C 1, the other end of resistance R 2, the other end of loudspeaker BL respectively.
Described because the AB lead exists, and the emitter of triode VT1 is by short circuit, and triode VT1 is in cut-off state, loudspeaker BL does not work; If the AB short-circuit line is broken, triode VT2 obtains bias current by resistance R 1, and circuit is starting of oscillation at once, and loudspeaker BL will send chimes of doom.
The present invention is simple in structure, and theftproof performance is good, and stable, can accurately send alerting signal to people, is easy to promote and use.
Description of drawings:
Fig. 1 is a structural representation of the present invention.
Embodiment:
With reference to Fig. 1; This embodiment adopts following technical scheme: it comprises power supply E, switch S, resistance R 1-R2, capacitor C 1-C2, triode VT1-VT2 and loudspeaker BL; The positive pole of power supply E is connected with an end of switch S; Its other end is connected with the positive pole of capacitor C 2, the emitter of triode VT2 and an end of resistance R 1 respectively, and the negative pole of capacitor C 2 is connected with power supply E negative pole, and the collector of triode VT2 is connected with an end of resistance R 2 and the end of loudspeaker BL respectively; The other end of loudspeaker BL is connected with the negative pole of capacitor C 2; The base stage of triode VT2 is connected with the collector of triode VT1, and the base stage of triode VT1 is connected with the A end with the other end of resistance R 1, the positive pole of capacitor C 1 respectively, and the emitter of triode VT1 is connected with the B end with the negative pole of capacitor C 1, the other end of resistance R 2, the other end of loudspeaker BL respectively.
Described because the AB lead exists, and the emitter of triode VT1 is by short circuit, and triode VT1 is in cut-off state, loudspeaker BL does not work; If the AB short-circuit line is broken, triode VT2 obtains bias current by resistance R 1, and circuit is starting of oscillation at once, and loudspeaker BL will send chimes of doom.
This embodiment is simple in structure, and theftproof performance is good, and stable, can accurately send alerting signal to people, is easy to promote and use.
Claims (1)
1. break line type anti-theft warning circuit figure; It is characterized in that it comprises power supply (E), switch (S), resistance (R1-R2), electric capacity (C1-C2), triode (VT1-VT2) and loudspeaker (BL); The positive pole of power supply (E) is connected with an end of switch (S); Its other end is connected with the positive pole of electric capacity (C2), the emitter of triode (VT2) and an end of resistance (R1) respectively; The negative pole of electric capacity (C2) is connected with power supply (E) negative pole; The collector of triode (VT2) is connected with an end of resistance (R2) and an end of loudspeaker (BL) respectively, and the other end of loudspeaker (BL) is connected with the negative pole of electric capacity (C2), and the base stage of triode (VT2) is connected with the collector of triode (VT1); The base stage of triode (VT1) is connected with the A end with the other end of resistance (R1), the positive pole of electric capacity (C1) respectively, and the emitter of triode (VT1) is connected with the B end with the negative pole of electric capacity (C1), the other end of resistance (R2), the other end of loudspeaker (BL) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110160701 CN102831744A (en) | 2011-06-15 | 2011-06-15 | Disconnection type theft-proof alarm circuit diagram |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110160701 CN102831744A (en) | 2011-06-15 | 2011-06-15 | Disconnection type theft-proof alarm circuit diagram |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102831744A true CN102831744A (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110160701 Pending CN102831744A (en) | 2011-06-15 | 2011-06-15 | Disconnection type theft-proof alarm circuit diagram |
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| CN (1) | CN102831744A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106725397A (en) * | 2016-12-30 | 2017-05-31 | 东莞市同祥海绵制品有限公司 | A kind of pillow of heart rate and blood pressure measuring method and implementation the method |
-
2011
- 2011-06-15 CN CN 201110160701 patent/CN102831744A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106725397A (en) * | 2016-12-30 | 2017-05-31 | 东莞市同祥海绵制品有限公司 | A kind of pillow of heart rate and blood pressure measuring method and implementation the method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121219 |