CN2282304Y - Multifunctional telephone anti-theft eavesdropping alarm - Google Patents

Abstract

A multifunctional telephone anti-theft and eavesdropping alarm is composed of positive and negative pole identification circuit, signal detection circuit, self-locking control circuit, telephone set identification circuit, sound-light alarm circuit, audio oscillator and loudspeaker. D₁、D₂、D₃And D₄The positive and negative pole identification circuit is composed of DW and R₁、R₂And BG₂BG₂、BG₃、D₆And D₈Form a self-locking control circuit, IC, R₃、R₄、R₅、R₆、R₇、R₁₁、BG₁And D₅The phone identification circuit is formed, the five pins of the IC are connected with the positive pole of a power supply Ec, and the negative pole of the power supply Ec is grounded.

Description

The antitheft eavesdropping alarm of multi-function telephones

The utility model relates to warning device, relates in particular to the antitheft eavesdropping alarm of multi-function telephones.

Commercially available phone burglar alarm is self power supply with the power supply on the telephone line now, and when its telephone line of controlling was stolen, alarm just produced an interference signal, and to master alarm.If owner does not exist, do not know that even there is the people to usurp especially usurp for broken string, alarm is then powerless yet; When owner breathes out, then to disconnect alarm earlier, or switch is got to talking position, use very inconvenient.

The purpose of this utility model is, overcomes the deficiencies in the prior art part, provides a kind of with self power control circuit, the antitheft eavesdropping alarm of multi-function telephones of energy locking circuit and warning.

The antitheft eavesdropping alarm of multi-function telephones described in the utility model is by both positive and negative polarity identification circuit, signal deteching circuit, form from lock control circuit, phone identification circuit, sound light alarming circuit, audio frequency oscillator and loud speaker.Diode D ₁, D ₂, D ₂And D ₄Form described both positive and negative polarity identification circuit; Voltage stabilizing didoe DW, resistance R ₁, R ₂With triode BG ₂Forming signal deteching circuit, is again simultaneously the part from lock control circuit; Triode BG ₂, BG ₃, diode D ₆And resistance R ₈Composition is from lock control circuit; Integration module IC, resistance R ₃, R ₄, R ₅, R ₆, R ₇, R ₁₁, triode BG ₁With diode D ₅Form the phone identification circuit, integration module IC five pin connect the positive pole of power supply Ec, the minus earth of power supply Ec; Triode BG ₄, BG ₅, capacitor C ₄, resistance R ₉, R ₁₀, LED forms sound light alarming circuit.A ₁And A ₂Be outside line input, A ₁And A ₂Answer machine or microcomputer.

Use the antitheft eavesdropping alarm of multi-function telephones described in the utility model technology, when circuit is stolen, sound light alarming circuit work, the luminous indication of LED, triode BG ₄And BG ₅Audio frequency oscillator work, loud speaker Y sounding reminding machine master, and, circuit can not be worked, till the machine master is resetted simultaneously in addition self-locking of circuit; Just have the third party to eavesdrop when the normal talking as line user, alarm will be reported to the police, and no longer eavesdrops as the listener-in, and the machine master presses reset key, and normal talking can be proceeded; Finish not put well receiver as normal talking, i.e. mis-hanging-up, alarm promptly can send chimes of doom and inform the machine master; Charged line is as being short-circuited or open circuit fault, and alarm promptly can be reported to the police automatically, if press after the reset key still reporting to the police, can predicate line fault.The antitheft eavesdropping alarm of multi-function telephones described in the utility model is applicable to common program-controlled telephone or networking microcomputer.

Accompanying drawing is the circuit diagram of the antitheft eavesdropping alarm of multi-function telephones described in the utility model.

Referring now to accompanying drawing, be described as follows in conjunction with the embodiments: described both positive and negative polarity identification circuit has diode D ₁, D ₂, D ₃, D ₄Form diode D ₁And D ₂Negative pole is connected on the wherein single line of outside line, and positive pole is connected on the ground wire of control circuit, diode D ₃And D ₄Positive pole is connected on wherein other single line of outside line, and negative pole is connected on the B point, with negative pole and the triode BG of voltage stabilizing didoe DW ₃Collector electrode be linked together.Described signal deteching circuit has voltage stabilizing didoe DW, resistance R ₁, R ₂With triode BG ₂Form, simultaneously again as part from lock control circuit.The positive pole of voltage stabilizing didoe DW and resistance R ₁Connect resistance R ₁With resistance R ₂Butt joint, resistance R ₂Other end ground connection, capacitor C ₁Be attempted by resistance R ₂Two ends, triode BG ₂Base stage be connected on resistance R ₁With R ₂Between.Described have triode BG from lock control circuit ₂, BG ₃, diode D ₆And resistance R ₈Form triode BG ₂Pass through resistance R ₈With triode BG ₃Base stage butt joint, triode BG ₃Grounded emitter, triode BG ₂Emitter and diode D ₆Negative pole connects, diode D ₆Positive pole and the positive pole of power supply Ec join.One termination triode BG of W reset key ₃Base stage, other end ground connection, capacitor C ₃Be power filtering capacitor, be connected on the two ends of power supply Ec, the positive pole of power supply Ec connects five pin of integration module IC, the minus earth of power supply Ec.Described phone identification circuit has integration module IC, resistance R ₃, R ₄, R ₅, R ₆, R ₇, R ₁₁, triode BG ₁, diode D ₅And capacitor C ₂Form resistance R ₃A wherein single line that terminates in the outside line on, the other end machine of answering, capacitor C ₂With resistance R ₃Two ends and connect resistance R ₄The other end and resistance R ₃An end connect resistance R ₄The other end and resistance R ₅Connect, and link resistance R with the pin of integration module IC ₅Other end ground connection.Resistance R ₆An end and resistance R ₃The other end (the machine end of answering) link.Resistance R ₆The other end and resistance R ₇Link, and link with two pin of integration module IC.Resistance R ₇Other end ground connection, four pin of integration module IC and six pin and resistance R ₁₁An end be linked together resistance R ₁₁The other end and triode BG ₁Base stage connect triode BG ₁Emitter be connected on the positive pole of power supply Ec BG ₁Collector electrode and diode D ₅Positive pole link diode D ₅Positive pole and triode BG ₂The base stage butt joint.Described sound light alarming circuit has triode BG ₄, BG ₅, capacitor C 4, loud speaker Y, resistance R ₉, R ₁₀, LED forms resistance R ₉And R ₁₀Link, and with triode BG ₂Collector electrode link resistance R ₁₀The other end and the E utmost point of LED link the LED minus earth.Resistance R ₉The other end and triode BG ₄Base stage link BG ₄Grounded emitter, BG ₄Collector electrode and triode BG ₅Base stage link BG ₅Emitter and the positive pole of power supply Ec link BG ₅Collector electrode and loud speaker Y link other end ground connection.Capacitor C ₄A termination triode BG ₅Collector electrode, capacitor C ₄The other end and triode BG ₄Base stage join.

Parameter is selected: R ₁=220K, R ₂=22K, R ₃=77 Ω, R ₄～R ₇=56K, R ₆=2.4K, R ₉=56K, R ₁₀=2K, R ₁₁=2.4K, C ₁=100 μ, C ₂=22 μ, C ₃=100 μ, C ₄=0.1 μ.Triode BG ₁And BG ₂Be 9015, triode BG ₃Be 3DA87E, D ₁～D ₄Be 1N4007, D ₅～D ₆Be 1N4148, it is the voltage-stabiliser tube of 7.5V that DW selects the voltage stabilizing value for use.

The course of work: during telephone set (microcomputer) on-hook, the voltage of outer circuit is direct current 48V, through D ₁, D ₄Or D ₂, D ₃After the identification, through DW, R ₁And R ₂Supply with BG after the dividing potential drop ₂, make BG ₂Be in cut-off state, this moment, the complete machine operating current was zero, and audible-visual annunciator is not worked.In case circuit stolen (break or make contact etc.) can cause outer circuit voltage to drop to about 10V or no-voltage, this moment BG ₂The positively biased conducting, BG ₃The work self-locking, sound and light alarm.If broken string is usurped, because C ₁Time-lag action, even give connection to external call, also can continue to report to the police, inform the machine master, press reset key W until the machine master.When machine master oneself breathes out, because C ₁Time-lag action, BG ₂Can not conducting immediately because of the decline of outside line voltage, at this moment, the work of phone identification circuit, the pin of IC and two pin current potentials are inequality, four pin (or six pin) output electronegative potential, triode BG ₁Saturation conduction voltage adds to BG ₂Base stage makes BG ₂Do not work, thereby the sound light alarming circuit latching circuit do not work, do not influence the machine master and normally breathe out.The machine master makes circuit in running order if converse, and in a single day this circuit is wiretaped by external phone, will make R ₃About the voltage decline 1V at two ends, IC does not work, four, six pin output high potential, BG ₁End BG ₂The positively biased conducting, sound light alarming circuit, latching circuit work.If the listener-in presses and can continue conversation behind the reset key W in eavesdropping this moment.Talk-through, if machine master mis-hanging-up, because the effect of program control circuit could make R ₃Both end voltage drops to about 0.8V, and IC does not work, four pin and six pin output high potential, BG ₁End BG ₂The positively biased conducting, machine master mis-hanging-up is informed in sound light alarming circuit work.

Claims (4)

1, the antitheft eavesdropping alarm of a kind of multi-function telephones by both positive and negative polarity identification circuit, signal deteching circuit, form from lock control circuit, phone identification circuit, sound light alarming circuit, audio frequency oscillator and loud speaker, is characterized in that D ₁, D ₂, D ₃And D ₄Form described both positive and negative polarity identification circuit; DW, R ₁, R ₂And BG ₂Forming signal deteching circuit, is again simultaneously the part from lock control circuit; BG ₂, BG ₃, D ₆And R ₈Composition is from lock control circuit; IC, R ₃, R ₄, ₅, R ₆, R ₇, R ₁₁, BG ₁And D ₅Form the phone identification circuit; BG ₄, BG ₅, C ₄, R ₉, R ₁₀Form sound light alarming circuit with LED.

2, the antitheft eavesdropping alarm of multi-function telephones according to claim 1 is characterized in that the D in the both positive and negative polarity identification circuit ₁And D ₂Negative pole be connected on the wherein single line of outside line, positive pole is connected on the ground wire of control circuit, D ₃And D ₄Positive pole be connected on the in addition single line of outside line, negative pole is connected on the B point.

3, the antitheft eavesdropping alarm of multi-function telephones according to claim 1 is characterized in that positive pole and the R of DW in the described signal deteching circuit ₁Connect R ₁With R ₂Butt joint, R ₂Other end ground connection, C ₁Be attempted by R ₂Two ends, BG ₂Base stage be connected on R ₁With R ₂Between.

4, the antitheft eavesdropping alarm of multi-function telephones according to claim 1 is characterized in that the R in the described sound light alarming circuit ₉And R ₁₀Link, and and BG ₂Collector electrode link R ₁₀The other end and the positive pole of LED link the minus earth of LED.