CN2090083U - Doppler anti-theft siren - Google Patents
Doppler anti-theft siren Download PDFInfo
- Publication number
- CN2090083U CN2090083U CN 91212611 CN91212611U CN2090083U CN 2090083 U CN2090083 U CN 2090083U CN 91212611 CN91212611 CN 91212611 CN 91212611 U CN91212611 U CN 91212611U CN 2090083 U CN2090083 U CN 2090083U
- Authority
- CN
- China
- Prior art keywords
- alarm
- doppler
- utility
- model
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Landscapes
- Burglar Alarm Systems (AREA)
Abstract
The utility model relates to a Doppler anti-theft alarm, which is composed of an emitter, a receiving amplifier, a signal comparator, a power driver and an alarm bell. The emitter and the receiving amplifier are arranged on the same circuit board; when a person enters the alarm range of Doppler anti-theft alarm, signals which are reflected back generate frequency displacement with original signals, and the Doppler anti-theft alarm is triggered to make alarm. The utility model has the advantages of reasonable structure, low cost, simple circuit, easy debugging, convenient operation and reliable performance, and is suitable for government offices, schools, shops, warehouses, etc.
Description
The utility model relates to a kind of Doppler's burglar alarm.
Existing Doppler's burglar alarm, due to its circuit structure, circuit complexity not only, the cost price height, debug difficulties, and also interference free performance is poor, and the rate of false alarm height is difficult to popularize and uses.
The purpose of this utility model is that design is a kind of rational in infrastructure, and circuit is simple, and is with low cost, and the Ultrasonic Intruder Alarm of dependable performance in order to the cost performance that improves existing Doppler's burglar alarm, promotes the renewal of product.
Major technique characteristics of the present utility model be with radio frequency transmit and receive partial circuit design on same circuit board, utilize human body to enter into Doppler's alarm fence coverage and make and produce frequency displacement between the signal of reflected back and the original signal, and then trigger alarm equipment alarm.
Below in conjunction with accompanying drawing the utility model is elaborated:
Fig. 1 is an electric functional-block diagram of the present utility model;
Fig. 2 is an electrical schematic diagram of the present utility model.
Referring to accompanying drawing 1, the utility model is by transmitter 1, reception amplifier 2, and signal comparator 3, analog line driver 4, alarm bell 5 are formed, and described reception amplifier 2, signal comparator 3, analog line driver 4, alarm bell 5 are connected in series successively.
Referring to accompanying drawing 2, the transmitter 1 in the utility model is by resistance R
9-R
12, potentiometer W
3, capacitor C
5, inductance L
1, triode BG
2, antenna L
0Constitute; Reception amplifier 2 is by resistance R
6-R
8, capacitor C
6-C
8, triode BG
1Constitute; Signal comparator 3 is by resistance R
2-R
5, potentiometer W
1, W
2, capacitor C
4, C
5Diode D
6, D
7, two operational amplifier 5G28 constitute; Analog line driver 4 is by resistance R
1, capacitor C
3, diode D
5, button AN
1, controllable silicon SCR
1, relay J constitutes.
Principle of work of the present utility model is as follows: energized, civil power is through transformer B
1Transformation reaches by diode D
1-D
4After the rectifier bridge rectification that constitutes, again through capacitor C
1, C
2Filtering and three end integrated voltage stabilizer 78L12 voltage stabilizings become direct supply, use for the ultrasound wave alarm.Ultrasonic transmitter gets electric work, its capacitor C
9With inductance L
1The LC resonant circuit starting of oscillation that constitutes, and, outwards launch ultrasound wave by antenna; The ultrasound wave reception amplifier is by coupling capacitance C
7Amplify after receiving ultrasonic signal, and send into signal comparator integrated package 5G28 and compare, when the applied signal voltage amplitude is between the bound voltage comparator reference voltage value that is made of two integrated package 5G28, the signal comparator no-output, the warning alarm bell is noiseless, when the applied signal voltage amplitude is in signal comparator up and down outside the reference voltage value time, the signal comparator output signal triggers the controllable silicon SCR in the analog line driver
1Conducting, it is electric that relay J is got, its normally opened contact J
1Closure, alarm bell DL sounding alarm.Press the button AN
1, the outage of alarm alarm bell is closed.
The utility model can be by adjusting capacitor C
9Change warning sensitivity, also can adjust potentiometer W
1, W
2Change the comparator reference magnitude of voltage, and then widen the sensitivity adjustment scope.
Of the present utility model simple and easy to use, need only opening power, pull out emitting antenna, adjust fence coverage and get final product.When the people entered fence coverage, Doppler's alarm was triggered, and the alarm alarm bell is a sounding alarm.
In sum, the utility model is simple in structure, adjusts easily, and is easy to use, and dependable performance is suitable for places such as office, school, shop, warehouse and uses.
Claims (1)
1, a kind of Doppler's burglar alarm, it is by transmitter (1), reception amplifier (2), signal comparator (3), analog line driver (4) and alarm bell (5) are formed, it is characterized in that reception amplifier (2), signal comparator (3), analog line driver (4), alarm bell (5) is connected in series successively, and be installed on the same circuit board with transmitter (1), described transmitter (1) is by resistance R
9-R
12, potentiometer W
3, capacitor C
5, inductance L
1, triode BG
2, antenna L
0Constitute, reception amplifier (2) is by resistance R
6-R
8, capacitor C
6-C
8Triode BG
1Constitute, signal comparator (3) is by resistance R
2-R
5, potentiometer W
1, W
2, capacitor C
4, C
5, diode D
6, D
7, two operational amplifier 5G28 constitute, analog line driver (4) is by resistance R
1, capacitor C
3, diode D
5, button AN
1, controllable silicon SCR
1, relay J constitutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91212611 CN2090083U (en) | 1991-05-03 | 1991-05-03 | Doppler anti-theft siren |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91212611 CN2090083U (en) | 1991-05-03 | 1991-05-03 | Doppler anti-theft siren |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2090083U true CN2090083U (en) | 1991-12-04 |
Family
ID=4921122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91212611 Withdrawn CN2090083U (en) | 1991-05-03 | 1991-05-03 | Doppler anti-theft siren |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2090083U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102915611A (en) * | 2012-10-30 | 2013-02-06 | 成都江法科技有限公司 | Door and window burglar alarm based on Doppler effect |
| CN104794840A (en) * | 2015-04-10 | 2015-07-22 | 华东师范大学 | Ultrasonic Doppler alarm |
-
1991
- 1991-05-03 CN CN 91212611 patent/CN2090083U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102915611A (en) * | 2012-10-30 | 2013-02-06 | 成都江法科技有限公司 | Door and window burglar alarm based on Doppler effect |
| CN104794840A (en) * | 2015-04-10 | 2015-07-22 | 华东师范大学 | Ultrasonic Doppler alarm |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0246301B1 (en) | Portable, batteryless, frequency divider consisting of inductor and diode | |
| US6166660A (en) | Driveway alarm system | |
| CN2090083U (en) | Doppler anti-theft siren | |
| CN2471040Y (en) | Mobile phone lost alarm device | |
| CN2172891Y (en) | Remote-control universal burglar alarm | |
| CN2391251Y (en) | High voltage electrical safety alarmer | |
| CN2413457Y (en) | Loudspeaker box with burglar alarm | |
| CN2611999Y (en) | Sensing early warning device | |
| CN2148986Y (en) | microwave radio buzzer | |
| CN2152136Y (en) | Multifunction flashlight | |
| CN2336414Y (en) | Multifunctional remote control alarm | |
| CN2249929Y (en) | Multifunctional anti-stealing alarm | |
| CN2035119U (en) | Multi-function theft-against microwave telecontrolled warner | |
| CN2083810U (en) | Radio/ remote alarm device | |
| CN2154508Y (en) | Transduce remote controlled siren | |
| CN2314411Y (en) | Wireless alarm for preventing commodity from being stolen | |
| CN2107685U (en) | Wireless theft-proof alarm | |
| CN2279660Y (en) | Multi-user antitheft alarmer | |
| CN2129437Y (en) | Anti-lose anti-theft alarm for articles carryed with sb. | |
| CN2245240Y (en) | Wireless theft-proof alarm device | |
| CN2284981Y (en) | Theft-proof alarm for carried articles | |
| CN2042220U (en) | Remote sensing and controlled theft-defence device | |
| CN202976372U (en) | Microwave burglar alarm | |
| CN2269103Y (en) | Alarm device for anti-robbing case and bag | |
| CN2112865U (en) | Theft-proof alarm device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |