CN2185960Y

CN2185960Y - Theft-proof line-locking alarm device for telephone line

Info

Publication number: CN2185960Y
Application number: CN 94204383
Authority: CN
Inventors: 倪晓文
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-02-26
Filing date: 1994-02-26
Publication date: 1994-12-21
Anticipated expiration: 2004-02-26

Abstract

The utility model relates to a theft-proof line-locking alarm device for a telephone line, which is disclosed in order to prevent the telephone line being stealthily used. The technical point is that the upper surface of the shell is provided with line-locking switch and a light emitting diode. A loudspeaker section and a circuit section are arranged in the shell. The circuit section is composed of a dialing tone decoding circuit, a time delay circuit, an alarm circuit, and a DC blocking charge and discharge circuit. The theft-proof line-locking alarm device for a telephone line has the advantages of small size, low cost, simple circuit, convenient installation, and the test is not needed. The theft-proof line-locking alarm device for a telephone line has a line stealing use alarming device, and does not influence the normal operation of the telephone exchange when used.

Description

Theft-proof line-locking alarm device for telephone line

The utility model relates to a kind of telephone line burglar alarm, relates in particular to the thief-proof line-locking alarm of a kind of telephone line.

Along with improving constantly of people's living standard, communication telephones has been come into huge numbers of families, and this brings great convenience to people's life.But other people the thing of circuit happen occasionally thing followed steal, and this has brought very big loss for telephone subscriber's economy, has upset the development of communication career.At present, the telephone line anti-theft arrangement of having developed in China, lock machine is locking wire not, or there is the locking wire function certain inhibitory action to be arranged to stealing line, but this telephone line anti-theft arrangement influences telephone exchange work, do not have warning device, can't determine to steal the correct time of circuit, to checking that line work has brought inconvenience.

The purpose of this utility model just is to provide a kind of volume little, and cost is low, and circuit is simple, does not influence telephone exchange work, and is easy for installation, has the thief-proof line-locking alarm of telephone line of alarm indication.

On housing, be provided with locking wire K switch and LED for the utility model that achieves the above object is achieved in that, in housing, be provided with loud speaker SP and circuit part.The dialing tone decoding circuit that circuit part is made up of single-tone decoding integrated chip, resistance, electric capacity; The delay circuit of 555 o'clock base chips, resistance, electric capacity, light-emitting diode and relay compositions; Warning circuit and stopping direct current charge-discharge circuit constitute.The dialing tone decoding circuit is that 3 pin at single-tone decoding integrated chip LM567 are to being in series with capacitor C 1, resistance R 1 and locking wire K switch between the outside line successively, at 1,2,6 pin of LM567 to being connected to electrochemical capacitor C2, C3, C4 between the ground respectively, between 5 pin and 6 pin, be in series with variable resistor R3 and

resistance R

2,4 pin connect power supply, 7 pin ground connection, at 4 pin to being connected to electrochemical capacitor C5 between the ground, 2 pin of 555 o'clock base chips are connected in output 8 pin and the delay circuit, at 8 pin of LM567 to being connected to resistance R 4 between the power supply; Delay circuit be 555 o'clock the base chip 3 pin to being in series with relay J and LED between the ground, be parallel with resistance R 6 at the relay J two ends, 1 pin ground connection, 4,8 pin connect power supply, at 5 pin to being connected to capacitor C 7 between the ground, 7 pin are connected with 6 pin, at 6 pin to being connected to resistance R 5,6 pin between the power supply to being connected to capacitor C 6 between the ground; Warning circuit is to be connected to loud speaker SP between 2 pin of music ic VT66A and 3 pin, 1 pin ground connection, at 3 pin to being in series with relay node J2 and resistance R 7 between the power supply; The stopping direct current charge-discharge circuit is to be in series with electrochemical capacitor C8, C9 and relay node J1 between two lead-in wires.

The utility model has the advantages that: volume is little, and cost is low, and circuit is simple, need not test, and being contained in does not influence the telephone exchange operate as normal on the teleset line, and has theft use circuit acoustic-optic alarm.

The drawing explanation:

Accompanying drawing 1 is the three-dimensional profile schematic diagram of the utility model;

Accompanying drawing 2 is the utility model circuit theory diagrams.

Now in conjunction with specific embodiments the utility model is described further:

On housing ［ 1 ］, be provided with locking wire K switch and LED, be provided with loud speaker SP and circuit part in housing ［ 1 ］ lining.Circuit part is to be made of dialing tone decoding circuit ［ 4 ］, delay circuit ［ 5 ］, warning circuit ［ 6 ］ and stopping direct current charge-discharge circuit ［ 3 ］.Dialing tone decoding circuit ［ 4 ］ is that 3 pin at single-tone decoding integrated chip LM567 are in series with capacitor C 1 successively between the positive pole of go between ［ 2 ］, resistance R 1 and locking wire K switch, the positive pole of capacitor C 1 is connected with resistance R 1, at 1 of LM567,2,6 pin are to being connected to electrochemical capacitor C2 between the ground respectively, C3, C4, electrochemical capacitor C2, C3, the negative pole of C4 is connected with ground, between 5 pin and 6 pin, be in series with variable resistor R3 and

resistance R

2,4 pin connect power supply, 7 pin ground connection, at 4 pin to being connected to electrochemical capacitor C5 between the ground, 2 pin of 555 o'clock base chips are connected in output 8 pin and the delay circuit ［ 5 ］, at 8 pin of LM567 to being connected to resistance R 4 between the power supply.Delay circuit ［ 5 ］ be 555 o'clock the base chip 3 pin to being in series with relay J and LED between the ground, the positive level of diode (LED) is connected with relay J, negative pole connects ground, is parallel with resistance R 6,1 pin ground connection at the relay J two ends, 4,8 pin connect power supply, be connected with 6 pin to being connected to

capacitor C

7,7 pin between the ground at 5 pin, at 6 pin to being connected to resistance R 5 between the power supply, at 6 pin to being connected to capacitor C 6 between the ground, capacitor C 6 negativing ending groundings.Warning circuit ［ 6 ］ is to be connected to loud speaker SP between 2 pin of music ic VT66A and 3 pin, 1 pin ground connection, at 3 pin to being in series with relay node J2 and resistance R 7 between the power supply.Stopping direct current charge-discharge circuit ［ 3 ］ is to be in series with electrochemical capacitor C8, C9 and relay node J1 between lead-in wire ［ 2 ］.Electrochemical capacitor C8 is connected with negative pole with the C9 negative pole, and the positive pole with capacitor C 8 is connected with the lead-in wire positive pole again, and the positive pole of capacitor C 9 is connected with relay node J1.Lead-in wire ［ 2 ］ with the thief-proof line-locking alarm of telephone line during use is attempted by on the telephone line, when oneself is made a phone call K is disconnected, thief-proof line-locking alarm of telephone line and outside line disconnect, after having made a call with locking wire K switch closure, when illegally making a phone call, the 450HZ signal is through the locking wire K switch, resistance R 1 and capacitor C 1 enter dialing tone decoding circuit ［ 4 ］, because the centre frequency that this circuit is formed is 450HZ, be that 8 pin of LM567 are electronegative potential in the dialing tone decoding circuit ［ 4 ］, 8 pin of LM567 are connected with 555 o'clock base chip 2 pin, and connect positive supply through resistance R 4, be in high potential at ordinary times, when 8 pin of LM567 are electronegative potential, it is high potential that this negative pulse makes 3 pin of 555 o'clock base chips, relay J energising adhesive, relay node J1, the J2 closure, the luminous demonstration of LED, visual alarm LED and loud speaker SP send alarm signal, because relay node J1 closure, telephone line is by electrochemical capacitor C8, C9 institute virtual short drags down voltage between lines and prevents the stolen use of circuit.Telephone hook switch is quiet to be closed on the node as directly the locking wire K switch being located at, and uses more convenient.

Claims

1, the thief-proof line-locking alarm of a kind of telephone line, it is characterized in that on housing [1], being provided with locking wire K switch and LED, be provided with loud speaker SP and circuit part in housing [1] lining, the dialing tone decoding circuit [4] that circuit part is made up of single-tone decoding integrated chip, resistance and electric capacity; The delay circuit [5] of 555 o'clock base chips, resistance, electric capacity, light-emitting diode and relay compositions; Warning circuit [6] and stopping direct current charge-discharge circuit [3] constitute.

2, the thief-proof line-locking alarm of a kind of telephone line as claimed in claim 1, it is characterized in that dialing tone decoding circuit ［ 4 ］ is that 3 pin at single-tone decoding integrated chip LM567 are in series with capacitor C 1 successively between outside line ［ 2 ］, resistance R 1 and locking wire K switch, at 1 of LM567,2,6 pin are to being connected to electrochemical capacitor C2 between the ground respectively, C3, C4, between 5 pin and 6 pin, be in series with variable resistor R3 and resistance R 2,4 pin connect power supply, 7 pin ground connection, at 4 pin to being connected to electrochemical capacitor C5 between the ground, 2 pin of 555 o'clock base chips are connected in output 8 pin and the delay circuit ［ 5 ］, at 8 pin of LM567 to being connected to resistance R 4 between the power supply; Delay circuit ［ 5 ］ be 555 o'clock the base chip 3 pin to being in series with relay J and LED between the ground, be parallel with resistance R 6 at the relay J two ends, 1 pin ground connection, 4,8 pin connect power supply, at 5 pin to being connected to capacitor C 7 between the ground, 7 pin are connected with 6 pin, at 6 pin to being connected to resistance R 5,6 pin between the power supply to being connected to capacitor C 6 between the ground; Warning circuit ［ 6 ］ is to be connected to loud speaker SP between 2 pin of music ic VT66A and 3 pin, 1 pin ground connection, at 3 pin to being in series with relay node J2 and resistance R 7 between the power supply; Stopping direct current charge-discharge circuit ［ 3 ］ is to be in series with electrochemical capacitor C8, C9 and relay node J1 between two lead-in wires ［ 2 ］.