CN2213407Y - Theft-proof line protecting box for telephone - Google Patents
Theft-proof line protecting box for telephone Download PDFInfo
- Publication number
- CN2213407Y CN2213407Y CN 94222879 CN94222879U CN2213407Y CN 2213407 Y CN2213407 Y CN 2213407Y CN 94222879 CN94222879 CN 94222879 CN 94222879 U CN94222879 U CN 94222879U CN 2213407 Y CN2213407 Y CN 2213407Y
- Authority
- CN
- China
- Prior art keywords
- telephone
- phone
- telephone line
- protective device
- triode
- 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.)
- Expired - Fee Related
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- Prepayment Telephone Systems (AREA)
Abstract
The utility model belongs to a telephone line protective device which is used for theft protection and can display the condition of the telephone line, which primarily solves the problem that the extension telephone is illegally jointed with the subscriber telephone line in parallel to use the subscriber telephone. The telephone line protective device is characterized in that the telephone line protective device comprises a bridge rectifier circuit, a voltage detection and indication circuit composed of a voltage stabilizing diode, a resistor, a transistor and a light emitting diode, an electronic interference circuit composed of a transistor, a voltage stabilizing diode and a light emitting diode and a current detection circuit composed of parallel jointing of a capacitor and a relay. The telephone line protective device has the advantages of reasonable design, simple structure, and low cost, and the legal telephone can be normally used, and the illegal telephone can not be used.
Description
The utility model relates to the anti-steal device of a kind of phone, particularly a kind of thief-proof phone line protecting box of using that prevents the illegal use of extension telephone machine on the phone inlet wire.
Development along with telecommunications, phone has been come into huge numbers of families, become indispensable communication tool in people's life, yet the people that some are very weak in the understanding of law, take illegal means, extension telephone machine (being illegal extension set) on other people telephone wire privately, other people phone of steal makes legal telephone subscriber suffer economic loss.
The purpose of this utility model is exactly to provide a kind of at above-mentioned weak point and prevent illegal extension set steal phone, and can show its corresponding state, the thief-proof phone line protecting box of using reasonable in design, simple in structure.
Technical solution of the present utility model is: a kind of thief-proof phone line protecting box of using, comprise the bridge rectifier that links to each other with phone end of incoming cables A, B, and it is characterized in that: this bridge rectifier output connects one by voltage stabilizing didoe DW
1, DW
2, resistance R
1-3, triode BG
1, LED
1, capacitor C voltage detecting and the indicating circuit formed.The triode BG of this voltage detecting and indicating circuit
1Collector electrode connects one by triode BG through relay normally-closed contact JK
2, voltage stabilizing didoe DW
3, LED
2The electronic jamming circuit of forming, the positive pole of this electronic jamming circuit is connected on the anode A of phone end of incoming cables.Between phone end of incoming cables anode A and phone leading-out terminal C, be provided with one by relay J, capacitor C
3And connect the current detection circuit of composition.
The utility model is owing to be provided with voltage detecting and indicating circuit, and when subscriber phone did not use and illegally extension set does not use, this circuit indicator was bright, shows to be in normal stand-by state.When the subscriber phone off-hook used, current detection circuit work disconnected the electronic jamming circuit simultaneously, can normally use phone.Behind illegal extension set access and off-hook, the electronic jamming circuit working drops to about 5V the voltage between the telephone wire, and like this, illegal extension set just can't use, and promptly can not outwards make a phone call.The utility model can stop the work of method phone effectively, and then gets rid of automatically, makes legal phone user exempt from economic loss, helps rectifying the telecommunications order.
Accompanying drawing is the utility model circuit diagram, and as Figure of abstract.
The utility model is described in further detail below in conjunction with accompanying drawing: as shown in drawings, A, B end can be connected A termination positive terminal with the local call telephone line.Diode D
1～D
4Form bridge circuit, make polar switching and anti-interference usefulness.Voltage stabilizing didoe DW
1, DW
2, resistance R
1～3, capacitor C
1, LED
1, triode BG
1Form voltage detecting and indicating circuit.Relay normally-closed contact JK, capacitor C
2, triode BG
2, resistance R
4, voltage stabilizing didoe DW
3, LED
2Form the electronic jamming circuit.Capacitor C
3, relay J and connect the composition current detection circuit, be connected on A, the C end.Any phone on telephone wire is off-hook not, and voltage is 48～60V between outside line, at this moment triode BG
1Conducting, BG
2End, the utility model is not worked, indicator light LED
1Bright, circuit is stand-by state.When legal receiver off-book, current detection circuit work, electric current makes the relay J adhesive, and its normally-closed contact JK disconnects, and the electronic jamming circuit is not worked, and can normally use.When illegal extension set off-hook, the utility model no current passes through, and relay J is not worked, triode BG
2Conducting, the electronic jamming circuit working can't use the machine of stealing, and indicator light LED
2Bright, thus reached the purpose of thief-proof demonstration.
Claims (1)
- A kind of thief-proof phone line protecting box of using comprises the bridge rectifier that links to each other with phone end of incoming cables (A, B), it is characterized in that: this bridge rectifier output connects one by voltage stabilizing didoe (DW 1, DW 2), resistance (R 1～3), triode (BG 1), light-emitting diode (LED 1), electric capacity (C 1) voltage detecting and the indicating circuit formed; Triode (the BG of this voltage detecting and indicating circuit 1) collector electrode connects one by triode (BG through relay normally-closed contact (JK) 2), voltage stabilizing didoe (DW 3), light-emitting diode (LED 2) the electronic jamming circuit formed, the positive pole of this electronic jamming circuit is connected on the phone end of incoming cables anode (A); Between phone end of incoming cables anode (A) and phone leading-out terminal (C), be provided with one by relay (J), electric capacity (C 3) and connect the current detection circuit of composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94222879 CN2213407Y (en) | 1994-10-08 | 1994-10-08 | Theft-proof line protecting box for telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94222879 CN2213407Y (en) | 1994-10-08 | 1994-10-08 | Theft-proof line protecting box for telephone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2213407Y true CN2213407Y (en) | 1995-11-22 |
Family
ID=33836759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94222879 Expired - Fee Related CN2213407Y (en) | 1994-10-08 | 1994-10-08 | Theft-proof line protecting box for telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2213407Y (en) |
-
1994
- 1994-10-08 CN CN 94222879 patent/CN2213407Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |