CN2216725Y - Alarm self-locking apparatus for embezzling telephone - Google Patents
Alarm self-locking apparatus for embezzling telephone Download PDFInfo
- Publication number
- CN2216725Y CN2216725Y CN 94220418 CN94220418U CN2216725Y CN 2216725 Y CN2216725 Y CN 2216725Y CN 94220418 CN94220418 CN 94220418 CN 94220418 U CN94220418 U CN 94220418U CN 2216725 Y CN2216725 Y CN 2216725Y
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- China
- Prior art keywords
- resistance
- embezzling
- self
- utility
- model
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- 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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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to an alarm self-locking apparatus against embezzling telephones, which is composed of a signal sampling circuit and an alarm self-locking circuit self-locking circuit and limits that illegal users embezzle telephone lines to carry out communication. The utility model is mainly composed of elements such as a rectifying bridge, an inverter, a transistor, resistors, etc., wherein, the input end of the rectifying bridge is switched on a communication line, and the output end is respectively connected with a voltage-stabilizing tube and a ground wire; the resistors R1 and R2 are connected with the ground after being connected in series, and the public end of the resistors is connected with the alarm self-locking circuit. When embezzling signals appear, the circuits generate interference pulse to do destruction to dialing and emits light chirping at the same time, and thus, the embezzling can not be carried out. The utility model has the advantages of simple circuits, reliable principles, convenient operation and connection, etc.
Description
The utility model belongs to the warning self-locking device that restriction invalid user stealing telephone line carries out communication.
At present, in China, the thing that communication is carried out in phreaking takes place again and again, cause bigger economic loss to users, therefore, produced many economic disputes, caused some destabilizing factors, for avoiding the generation of this type of incident, the spy has developed should the warning self-locking device.
The purpose of this utility model is to prevent the invalid user stealing telephone line effectively, can use phone in safe ready ground again, does not have influence to sending with the reception phone.
The utility model mainly is made of signal sampling circuit and warning latching circuit.When the invalid user stealing telephone line, signal sampling circuit work is delivered to the warning latching circuit with signal, the warning latching circuit just disturbs and blocks this circuit, appropriator can not be conversed with the other side, produce sound and light alarm simultaneously, allow the user in time find to usurp the circuit situation.Wherein signal sampling circuit mainly is in series by voltage stabilizing didoe and resistance and forms; The warning latching circuit can be made of various forms of oscillating circuits, as the controllable oscillatory circuit of formations such as various logic gates or 555 time-base circuits.
It is simple to the utlity model has circuit, and principle is reliable, uses advantages such as easy to connect.
Fig. 1 is a kind of enforcement circuit diagram of the present utility model:
Signal sampling circuit is made up of rectifier bridge DZ and resistance R 1, R2, voltage stabilizing didoe DW; The warning latching circuit is made up of inverter F1, F2, F3, F4, F5, triode T, resistance R 3, R4, R5, capacitor C 1, diode D1, D2, buzzer YD.A, B two terminate on the telephone line, and when the voltage at A, B two ends took place to descend significantly, then explanation had the people to use phone on this circuit; Signal sampling circuit detects the variation of this voltage immediately, make C point current potential become low level by high level, inverter F1 exports high level, diode D1 ends, and the oscillating circuit that inverter F2, F3, F4, F5 form is starting oscillation just, produces and disturbs in the arteries and veins, cause this circuit can't carry out communication, simultaneously, buzzer YD pipes, and light-emitting diode D2 is luminous.When the user need make a phone call or answer the call, answer cut-off switch QA, cut off the warning latching circuit.Except that above-mentioned situation, the QA that should close a switch connects the warning latching circuit.Battery E is the dc power supply of this device.
Rectifier bridge input in the utility model is in parallel with communication line, output one end ground connection, the other end joins with voltage stabilizing didoe DW and resistance R 5, voltage stabilizing didoe DW is anodal to join with resistance R 1, ground connection after the other end of resistance R 1 is connected with resistance R 2, common point and the warning latching circuit input of resistance R 1 and R2 join, and resistance R 5 lower ends are connected with the collector electrode of triode T, its emitter is by diode D2 ground connection, and complete machine is formed by the making sheet of electric elements electric connection.
Claims (1)
- One kind limit that the invalid user stealing telephone line carries out communication usurp the telephone call self-locking device, it is characterized in that the rectifier bridge input is in parallel with communication line, output one end ground connection, the other end joins with voltage stabilizing didoe DW and resistance R 5, voltage stabilizing didoe DW is anodal to join with resistance R 1, ground connection after the other end of resistance R 1 is connected with resistance R 2, common point and the warning latching circuit input of resistance R 1 and R2 join, resistance R 5 lower ends are connected with the collector electrode of triode T, its emitter is by diode D2 ground connection, and complete machine is formed by the making sheet of electric elements electric connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94220418 CN2216725Y (en) | 1994-08-29 | 1994-08-29 | Alarm self-locking apparatus for embezzling telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94220418 CN2216725Y (en) | 1994-08-29 | 1994-08-29 | Alarm self-locking apparatus for embezzling telephone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2216725Y true CN2216725Y (en) | 1996-01-03 |
Family
ID=33835022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94220418 Expired - Fee Related CN2216725Y (en) | 1994-08-29 | 1994-08-29 | Alarm self-locking apparatus for embezzling telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2216725Y (en) |
-
1994
- 1994-08-29 CN CN 94220418 patent/CN2216725Y/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 |