CN2194052Y - Monitor for preventing theft of telephone line - Google Patents

Monitor for preventing theft of telephone line Download PDF

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Publication number
CN2194052Y
CN2194052Y CN 94208068 CN94208068U CN2194052Y CN 2194052 Y CN2194052 Y CN 2194052Y CN 94208068 CN94208068 CN 94208068 CN 94208068 U CN94208068 U CN 94208068U CN 2194052 Y CN2194052 Y CN 2194052Y
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China
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circuit
telephone line
negative pole
pin
positive pole
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Expired - Fee Related
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CN 94208068
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Chinese (zh)
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杨志宏
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Individual
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Individual
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Abstract

The utility model relates to a monitor for preventing theft of a telephone line, which is characterized in that the monitor for preventing theft of a telephone line is composed of an installation indicator circuit 1, a sampling amplifying circuit 2, an electronic switching circuit 3, tank circuit 4, a multiresonant circuit 5 and a power circuit 6. The monitor for preventing theft of a telephone line has the advantages that the monitor for preventing theft of a telephone line can automatically identify whether the telephone is used by the subscriber or is embezzled by someone or is tapped by someone. The monitor for preventing theft of a telephone line has the double protection function and the double warning function of anti-fraudulent use and the anti-tapping. The monitor for preventing theft of a telephone line has the function of warning when the telephone line is abnormal and limiting the subscriber to use the telephone.

Description

Monitor for preventing theft of telephone line
The utility model is a kind of telephone line theftproof monitoring device that prevents that telephone line from being usurped or eavesdropping by making contact.
Telephone line is made contact to be usurped or eavesdrops, and is telephone subscriber's nuisance feelings the most.For this reason, more existing inventors have developed the theftproof monitoring device of some kinds.For example, the telephone line alarm of Shanghai Communications University, southwest exploitation is exactly a kind of comparatively typical anti-theft product, though it has when telephone line is usurped or eavesdropped by making contact the function of block telephone calls line immediately, but because its function is comparatively single, do not possess automatic recognition capability yet, between subsets work and monitoring telephone circuit, need artificial Push switch to change.Also need other distribution source ability operate as normal when working online in addition.
The purpose of this utility model provides a kind of to be had automatic recognition function and has the telephone line theftproof monitoring device of usurping or eavesdropping dual warning and can carry out functions such as short circuit abnormal alarm, the use of limited subscriber telephone set with regard to being to overcome above-mentioned weak point of the prior art.
The purpose of this utility model can adopt following measure to realize:
Telephone line theftproof monitoring device of the present utility model is by indicating circuit being installed, sampling amplification circuit, electronic switching circuit, multi-resonant oscillating circuit, and accumulator and power supply circuits composition; Wherein install indicating circuit 1 directly and user telephone line join; The control end of the output of sampling amplification circuit 2 and electronic switching circuit 3 joins, the B end of input termination SZ1 and the A end of SZ2; The A end of the input termination SZ2 of electronic switching circuit 3, the positive pole of output termination accumulator 4 first order storage capacitor C4; Directly to multi-resonant oscillating circuit 5 power supplies, multi-resonant oscillating circuit 5 joins by the control end of D4 and electronic switching circuit accumulator 4 second level storage capacitor C5; The input of power supply circuits output termination electronic switching circuit.The news Chinese percussion instrument also is housed in circuit.
Installation indicating circuit 1 in the utility model is to be made of D1, L1 and R3, the answer the call A end of circuit two wires input SZ2 of the negative pole of diode D1, that the negative pole of anodal sending and receiving optical diode L1, the end of the anodal connecting resistance R3 of L1, the other end of R3 and the B of SZ2 end are connected to mutually is public " " hold.
Subsets sampling amplification circuit in the sampling amplification circuit is to be made of SW1, R1, R2 and Q1, the B end of one end of switch SW 1, subscriber phone input SZ1, an end of resistance R 1 and an end of resistance R 2 are connected together mutually, that the emitter of the other end of SW1, the other end of R2 and triode Q1 is connected to is public " " end, the base stage of another termination Q1 of R1, the collector electrode of Q1 inserts the base stage of the signal input end triode Q3 of electronic switching circuit; Telephone line feed voltage sampling amplification circuit in the sampling amplification circuit is to be made of R4, R5 and Q2, the A end of one termination telephone line two wires input SZ2 of resistance R 4, the end of the other end connecting resistance R5 of R4 and the base stage of triode Q2, the other end of R5 with the emitter of Q2 be connected to public " " end, the collector electrode of Q2 connects the base stage of Q3.
Electronic switching circuit 3 is to be made of D2, R8, R9, C1, Q3 and Q4, the A end of the end of the anodal connecting resistance R8 of diode D2 and telephone line two wires input SZ2, the end of the negative pole connecting resistance R9 of D2 and the emitter of triode Q4, the other end of R8 is connected with the end of C1 and the base stage of Q3 with the other end of R9, that the other end of C1 inserts is public " " end, the collector electrode of Q3 is connected with the base stage of Q4, the emitter of Q4 is the input of electronic switch, and the collector electrode of Q4 is the output of electronic switch.
Accumulator 4 is to be made of Z1, C4, C5 and D3, the positive pole of the negative pole of voltage-stabiliser tube Z1, the positive pole of C4, diode D3 and the end of fictitious load BUZ are connected on the collector electrode of Q4, that the negative pole of the positive pole of Z1, the negative pole of C4, C5 and the other end of BUZ are connected to is public " " end, the negative pole of D3 is connected with 8 pin of the positive pole of C5 and integrated circuit (IC) 1.
Multi-resonant oscillating circuit 5 is to be made of C2, C3, IC1 and R6, R7, one end of capacitor C 2 is connected with 5 pin of integrated circuit (IC) 1, one end of 2 pin of the positive pole of electrochemical capacitor C3, IC1,6 pin and resistance R 6 is connected together, that 1 pin of the other end of C2, the negative pole of C3 and IC1 is connected to is public " " end, the end of another termination R7 of R6 and 7 pin of IC1,8 pin of another termination IC1 of resistance R 7, the negative pole of diode D4 connects 3 pin of IC1, and the positive pole of D4 connects the base stage of Q3.
Power supply circuits 6 are made up of battery BATTER, R10 and D5, one end of resistance R 10 is connected with the negative pole of diode D5, it is the output point of battery feed circuit, this point is received on the emitter of Q4, the other end of R10 and the positive pole of D5 are connected on the positive pole of battery, that the negative pole of battery connects is public " " end.
Advantage of the present utility model is:
A, can to discern automatically be the user using phone, still has the people usurping or tap phone;
B, when telephone line is usurped or is eavesdropped by overlap joint, it is the block telephone calls circuit immediately, has the anti-double protection functions of usurping with anti-eavesdrop;
C, when telephone line is usurped or is eavesdropped by overlap joint, it can send audible alarm immediately, has the anti-dual warning function of usurping with anti-eavesdrop;
D, be cut off or during short circuit, it can send audible alarm immediately, has telephone line abnormal alarm function when telephone line;
E, because this product has electronic lock, when electronic lock was closed, subscriber phone just can only receive incoming call and can not get phone, so product of the present utility model also has the function that the limited subscriber telephone set uses.
The drawing of accompanying drawing is described as follows:
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Fig. 3 is a shape assumption diagram of the present utility model.
The utility model is done with detailed description below with reference to embodiment (accompanying drawing):
As shown in Figure 1, telephone line theftproof monitoring device of the present utility model is by indicating circuit 1 being installed, sampling amplification circuit 2, electronic switching circuit 3, accumulator 4, multi-resonant oscillating circuit 5 and power supply circuits 6 compositions.Wherein install indicating circuit 1 directly and user telephone line join; The control end of the output of sampling amplification circuit 2 and electronic switching circuit 3 joins, and input connects the B end of SZ1 and the A end of SZ2 by R2, R4; The input of electronic switching circuit 3 is held by the A that D2 meets SZ2, the positive pole of output termination accumulator 4 first order storage capacitor C4; Directly to multi-resonant oscillating circuit 5 power supplies, multi-resonant oscillating circuit 5 joins by the control end of D4 and electronic switching circuit accumulator 4 second level storage capacitor C5; The input of power supply circuits output termination electronic switching circuit.
As shown in Figure 2, SZ1 is the subsets inputs, and SZ2 is a telephone line two wires input, and the A end of SZ1 and the A end of SZ2 are connected.
Installation indicating circuit 1 in the utility model is to be made of D1, L1 and R3, the answer the call A end of circuit two wires input SZ2 of the negative pole of diode D1, that the negative pole of anodal sending and receiving optical diode L1, the end of the anodal connecting resistance R3 of L1, the other end of R3 and the B of SZ2 end are connected to mutually is public " " hold.When two lines of telephone line inserted the two ends of SZ2, if electrode line connects the A end of SZ2, negative line connect the B end of SZ2, and then red light emitting diodes L1 does not work, i.e. expression connects correct, otherwise then L1 sends red light prompting polarity and connects instead.
Subsets sampling amplification circuit in the sampling amplification circuit 2 is to be made of SW1, R1, R2 and Q1, the B end of one end of switch SW 1, subscriber phone input SZ1, an end of resistance R 1 and an end of resistance R 2 are connected together mutually, that the emitter of the other end of SW1, the other end of R2 and triode Q1 is connected to is public " " end, the base stage of another termination Q1 of R1, the collector electrode of Q1 inserts the base stage of the signal input end triode Q3 of electronic switching circuit; When subsets are worked, pass through with regard to the electric current that certain value is arranged on the R2, the voltage on the R2 makes Q1 obtain base current by R1, thereby makes the Q1 conducting, if when the electric current that flows through is less than a certain numerical value on the R2, Q1 transfers to and ending.SW1 is with deciding the R2 telephone set electric current of whether taking a sample.
Telephone line feed voltage sampling amplification circuit in the sampling amplification circuit 2 is to be made of R4, R5 and Q2, the A end of one termination telephone line two wires input SZ2 of resistance R 4, the end of the other end connecting resistance R5 of R4 and the base stage of triode Q2, the other end of R5 with the emitter of Q2 be connected to public " " end, the collector electrode of Q2 connects the base stage of Q3.Feed voltage on the telephone line is added on the Q2 emitter after through R4 and R5 dividing potential drop, and when this voltage during greater than certain numerical value, Q2 conducting, if less than a certain numerical value, then Q2 ends.
Electronic switching circuit 3 is to be made of D2, R8, R9, C1, Q3 and Q4, the A end of the end of the anodal connecting resistance R8 of diode D2 and telephone line two wires input SZ2, the end of the negative pole connecting resistance R9 of D2 and the emitter of triode Q4, the other end of R8 is connected with the end of C1 and the base stage of Q3 with the other end of R9, that the other end of C1 inserts is public " " end, the collector electrode of Q3 is connected with the base stage of Q4, the emitter of Q4 is the input of electronic switch, and the collector electrode of Q4 is the output of electronic switch.Triode Q3 obtains base current by R8, R9; delay capacitor C1 is used for eliminating the influence of the instantaneous signal of AC signal or chance to circuit; avoid circuit erroneous action, Q3 be used for pull switch pipe Q4 conducting with end, D2 is the individual event switching diode that shields.
Accumulator 4 is to be made of Z1, C4, C5 and D3, the end of the positive pole of the negative pole of voltage-stabiliser tube Z1, the positive pole of C4, diode D3 and fictitious load news Chinese percussion instrument BUZ is connected on the collector electrode of Q4, that the negative pole of the positive pole of Z1, the negative pole of C4, C5 and the other end of BUZ are connected to is public " " end, the negative pole of D3 is connected with 8 pin of the positive pole of C5 and integrated circuit (IC) 1.Voltage-stabiliser tube Z1 has limited the maximum charging voltage on the C4, and C4 is a first order storage capacitor, and C5 is a second level storage capacitor, because the unidirectional conducting effect of diode D3, it is only powered to oscillating circuit.VCC only is an identifier among the figure, is used for representing the positive terminal of accumulator in circuit.
Multi-resonant oscillating circuit 5 is to be made of C2, C3, IC1 and R6, R7, one end of capacitor C 2 is connected with 5 pin of integrated circuit (IC) 1, one end of 2 pin of the positive pole of electrochemical capacitor C3, IC1,6 pin and resistance R 6 is connected together, that 1 pin of the other end of C2, the negative pole of C3 and IC1 is connected to is public " " end, the end of another termination R7 of R6 and 7 pin of IC1, the negative pole of the 8 pin diode D4 of another termination IC1 of resistance R 7 connects 3 pin of IC1, and the positive pole of D4 connects the base stage of Q3.The output voltage of IC1 pin 3 affacts by diode D4 on the base stage of Q3, when the circuit starting of oscillation, and control switch pipe Q4 conducting and ending periodically.
Power supply circuits 6 are made up of battery BATTER, R10 and D5, one end of resistance R 10 is connected with the negative pole of diode D5, it is the output point of battery feed circuit, this point is received on the emitter of Q4, the other end of R10 and the positive pole of D5 are connected on the positive pole of battery, that the negative pole of battery connects is public " " end.At the telephone line feed just often, diode D5 is in reverse bias, feed current by R10 to battery charge, if the telephone line feed voltage is very low or when equalling zero, battery makes D5 be in forward bias to circuit supply.
The model of the integrated circuit (IC) 1 that is adopted in the utility model is ICM7555IPA.
The utility model is described its circuit working principle below with reference to accompanying drawing:
When two lines of telephone line inserted the two ends of SZ2, if electrode line connects the A end of SZ2, negative line connect the B end of SZ2, and then red light emitting diodes L1 does not work, i.e. expression connects correct, otherwise then L1 sends red light prompting polarity and connects instead.After correct the installation, when subsets are not worked, if power down (promptly have telephone set make contact phreaking) takes place on the telephone line, then sampling amplification circuit is to high level of electronic switching circuit output, the electronic switch conducting, the feed current that the news Chinese percussion instrument will absorb telephone line sends rings, and causes simultaneously to make contact the telephone set short of electricity and can't work.When subsets are worked, if telephone set is arranged in addition on the telephone line also in work, cause load to increase the weight of (promptly wiretaping), then sampling amplification circuit is to high level of electronic switching circuit output, the electronic switch conducting, the feed current that the news Chinese percussion instrument will absorb telephone line sends rings, and causes all telephone set shorts of electricity on the telephone line simultaneously and can't work.Do not work and telephone line when power down does not take place when subsets, sampling amplification circuit is to low level of electronic switching circuit output, and electronic switch cuts out.When subsets work and telephone line load just often, sampling amplification circuit is to low level of electronic switching circuit output, electronic switch cuts out.When causing telephone line not have electricity owing to broken string, short circuit or other reason, the battery feed circuit output current, at this moment sampling amplification circuit is to high level of electronic switching circuit output, and the electronic switch conducting is interrogated Chinese percussion instrument and absorption current sent ring (telephone line abnormal alarm function).When SW1 is closed, the sampling amplification circuit telephone set electric current of not taking a sample, the power down that subsets work causes will make sampling amplification circuit to high level of electronic switching circuit output, the electronic switch conducting, the feed current that the news Chinese percussion instrument will absorb telephone line sends rings, cause the subsets short of electricity simultaneously and can't work, but this does not hinder subsets to receive bell signal (being the use of limited subscriber telephone set).

Claims (7)

1, a kind of telephone line theftproof monitoring device is characterized in that: it is by indicating circuit 1 being installed, sampling amplification circuit 2, electronic switching circuit 3, accumulator 4, and multi-resonant oscillating circuit 5 and power supply circuits 6 compositions; Wherein install indicating circuit 1 directly and user telephone line join; The control end of the output of sampling amplification circuit 2 and electronic switching circuit 3 joins, the B end of input termination SZ1 and the A end of SZ2; The A end of the input termination SZ2 of electronic switching circuit 3, the positive pole of output termination accumulator 4 first order storage capacitor C4; Directly to multi-resonant oscillating circuit 5 power supplies, multi-resonant oscillating circuit 5 joins by the control end of D4 and electronic switching circuit accumulator 4 second level storage capacitor C5; The input of power supply circuits output termination electronic switching circuit.
2, telephone line theftproof monitoring device according to claim 1, it is characterized in that: it is to be made of D1, L1 and R3 that indicating circuit 1 is installed, the answer the call A end of circuit two wires input SZ2 of the negative pole of diode D1, the negative pole of anodal sending and receiving optical diode L1, that the end of the anodal connecting resistance R3 of L1, the other end of R3 and the B of SZ2 end are connected to mutually is public " " end.
3, telephone line theftproof monitoring device according to claim 1, it is characterized in that: the subsets sampling amplification circuit in the sampling amplification circuit 2 is to be made of SW1, R1, R2 and Q1, the B end of one end of switch SW 1, subscriber phone input SZ1, an end of resistance R 1 and an end of resistance R 2 are connected together mutually, that the emitter of the other end of SW1, the other end of R2 and triode Q1 is connected to is public " " end, the base stage of another termination Q1 of R1, the collector electrode of Q1 inserts the base stage of the signal input end triode Q3 of electronic switching circuit; Telephone line feed voltage sampling amplification circuit in the sampling amplification circuit is to be made of R4, R5 and Q2, the A end of one termination telephone line two wires input SZ2 of resistance R 4, the end of the other end connecting resistance R5 of R4 and the base stage of triode Q2, the other end of R5 with the emitter of Q2 be connected to public " " end, the collector electrode of Q2 connects the base stage of Q3.
4, telephone line theftproof monitoring device according to claim 1, it is characterized in that: electronic switching circuit 3 is by D2, R8, R9, C1, Q3 and Q4 constitute, the A end of the end of the anodal connecting resistance R8 of diode D2 and telephone line two wires input SZ2, the end of the negative pole connecting resistance R9 of D2 and the emitter of triode Q4, the other end of R8 is connected with the end of C1 and the base stage of Q3 with the other end of R9, that the other end of C1 inserts is public " " end, the collector electrode of Q3 is connected with the base stage of Q4, the emitter of Q4 is the input of electronic switch, and the collector electrode of Q4 is the output of electronic switch.
5, telephone line theftproof monitoring device according to claim 1, it is characterized in that: accumulator 4 is to be made of Z1, C4, C5 and D3, the positive pole of the negative pole of voltage-stabiliser tube Z1, the positive pole of C4, diode D3 and the end of fictitious load BUZ are connected on the collector electrode of Q4, that the negative pole of the positive pole of Z1, the negative pole of C4, C5 and the other end of BUZ are connected to is public " " end, the negative pole of D3 is connected with 8 pin of the positive pole of C5 and integrated circuit (IC) 1.
6, telephone line theftproof monitoring device according to claim 1, it is characterized in that: multi-resonant oscillating circuit 5 is to be made of C2, C3, IC1 and R6, R7, one end of capacitor C 2 is connected with 5 pin of integrated circuit (IC) 1, one end of 2 pin of the positive pole of electrochemical capacitor C3, IC1,6 pin and resistance R 6 is connected together, that 1 pin of the other end of C2, the negative pole of C3 and IC1 is connected to is public " " end, the end of another termination R7 of R6 and 7 pin of IC1,8 pin of another termination IC1 of resistance R 7, the negative pole of diode D4 connects 3 pin of IC1, and the positive pole of D4 connects the base stage of Q3.
7, telephone line theftproof monitoring device according to claim 1, it is characterized in that: power supply circuits 6 are made up of battery BATTER, R10 and D5, one end of resistance R 10 is connected with the negative pole of diode D5, it is the output point of battery feed circuit, this point is received on the emitter of Q4, the other end of R10 and the positive pole of D5 are connected on the positive pole of battery, that the negative pole of battery connects is public " " end.
CN 94208068 1994-04-07 1994-04-07 Monitor for preventing theft of telephone line Expired - Fee Related CN2194052Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 94208068 CN2194052Y (en) 1994-04-07 1994-04-07 Monitor for preventing theft of telephone line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 94208068 CN2194052Y (en) 1994-04-07 1994-04-07 Monitor for preventing theft of telephone line

Publications (1)

Publication Number Publication Date
CN2194052Y true CN2194052Y (en) 1995-04-05

Family

ID=33826193

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 94208068 Expired - Fee Related CN2194052Y (en) 1994-04-07 1994-04-07 Monitor for preventing theft of telephone line

Country Status (1)

Country Link
CN (1) CN2194052Y (en)

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GR01 Patent grant
C19 Lapse of patent right due to non-payment of the annual fee
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