CN102595000A

CN102595000A - Remote fixed-line telephone listener

Info

Publication number: CN102595000A
Application number: CN2012100357109A
Authority: CN
Inventors: 何林
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-16
Filing date: 2012-02-16
Publication date: 2012-07-18

Abstract

The invention belongs to the technical fields of electronics and communication, and relates to a remote fixed-line telephone listener, which comprises a fixed-line telephone, a double-pole double-throw switch, an electret microphone, a 12V direct current power supply, a silicon controlled rectifier control and trigger circuit and a delay and control circuit. A time-base circuit IC1 in the delay and control circuit adopts the model number of NE555. Various telephones emerge in endlessly in the market, such as automatic alarming telephones, and cannot be afforded by ordinary blue-and-white collar workers. If the remote fixed-line telephone listener is installed on a telephone in a home, a remote fixed-line telephone listening function can be realized. If a user worries about the security of the home when the user goes out and nobody is at home, the user is only required to dial the fixed-line telephone, and then everything happening in the home can be listened, so that the worry of the user can be lifted.

Description

Long-range landline telephone monitor

Technical field

The invention belongs to electronic technology and communication technique field, relate to a kind of long-range landline telephone monitor.

Background technology

Telephone set miscellaneous emerges in an endless stream on the market, Automatic alarm telephone ... But these novel phones general wage-earners that cost an arm and a leg are difficult for bearing.

If the family telephone set is loaded onto long-range landline telephone monitor of the present invention, can realize landline telephone remote monitoring function.Marquis when unmanned in you are away from home house, if worried to family safety, as long as you dial the landline telephone in the family, all sounds of movement take place and could listen to immediately in family, can remove your trouble and worry!

It is simple that this monitor has a circuit, all uses common components and parts, and cost of manufacture only needs tens yuan, is well suited for exploitation in batches, also is suitable for developing the novel telephone set of the function with remote monitoring.

Below specify this long-range landline telephone monitor related correlation technique in implementation process.

Summary of the invention

Goal of the invention and beneficial effect: telephone set miscellaneous emerges in an endless stream on the market, Automatic alarm telephone ... But these novel phones general wage-earners that cost an arm and a leg are difficult for bearing.If the family telephone set is loaded onto long-range landline telephone monitor of the present invention, can realize landline telephone remote monitoring function.Marquis when unmanned in you are away from home house, if worried to family safety, as long as you dial the landline telephone in the family, all sounds of movement take place and could listen to immediately in family, can remove your trouble and worry!

The circuit working principle: behind the landline telephone in putting through house, bell signal makes one-way SCR VS triggering and conducting through germanium diode D1 rectification, and direct current relay K1 gets the electrician and does; Normally opened contact K1-1 is closed in the relay K 1, and telephone set is by off-hook, and Electret condenser microphone MIC starts working, the sound of sound of movement during you can listen and get home; Normally opened contact K1-2 is also closed among the direct current relay K1 simultaneously, and the delay circuit of being made up of NE555 gets electrician's work, and this moment, 3 pin of NE555 were exported electronegative potential, and direct current relay K2 keeps release; Through the time-delay of a few minutes, 3 pin of NE555 output high potential, direct current relay K2 gets the electrician and does; Its normally-closed contact K2-1 is broken off, the direct current relay K1 release of cut off the power supply, its normally opened contact K1-1 disconnection; The telephone set on-hook, the normally opened contact K1-2 of direct current K1 breaks off, and then delay circuit outage; Direct current relay K2 outage is released, its normally-closed contact K2-1 adhesive, and entire circuit resets.

When double-point double-throw switch placed " OFF " position, S1-1 broke off the 12V DC power supply, and S1-2 connects the loud speaker in the telephone set simultaneously, does not influence the normal use of telephone set.

When double-point double-throw switch places " ON " position, S1-1 connects the 12V DC power supply, and circuit must be established beginning work by cable, and LED is lighted, and breaks off the loud speaker BL in the telephone set by S1-2 simultaneously.

Technical scheme: long-range landline telephone monitor, comprise fixed telephone, double-point double-throw switch, Electret condenser microphone, 12V DC power supply, one-way SCR control and circuits for triggering, time-delay and control circuit composition, it is characterized in that:

Double-point double-throw switch: the public pin COM1 among the double-point double-throw switch S1-1 succeeds fixed contact and the fixed contact among the relay K 2 normally-closed contact K2-1 among the electrical equipment K1 normally opened contact K1-1; The ON1 termination 12V dc power anode of double-point double-throw switch S1-1; Public pin COM2 connects the end of loud speaker BL among the double-point double-throw switch S1-2; The other end of loud speaker BL answer the call an end and the circuit ground GND of power ringing output; Other 2 pin connect OFF2 end and ON2 end respectively among the double-point double-throw switch S1-2, the OFF2 end of another termination double-pole double throw switch S1-2 of ringing telephone stations output and the positive pole of germanium diode D1;

One-way SCR control and circuits for triggering thereof: the negative pole order of germanium diode D1 is to the control utmost point of controllable silicon VS; The anode of one-way SCR VS is succeeded an end of electrical equipment K1 coil; The moving contact of another relay termination K2 normally-closed contact K2-1 of relay K 1 coil, the negative electrode connection circuit ground GND of one-way SCR VS;

Time-delay and control circuit: form by time-base circuit IC1, timing capacitor C1, potentiometer RP, relay K 2; The model that time-base circuit IC1 adopts is NE555; The 2nd pin of time-base circuit IC1 and the 6th pin connect the negative pole of timing capacitor C1, the end of potentiometer RP; The 1st pin connection circuit ground GND of the other end of potentiometer RP and lever arm thereof and time-base circuit IC1; The anodal VCC of the 4th pin of the positive pole of timing capacitor C1 and time-base circuit IC1 and the 8th pin connection circuit, the 3rd pin of time-base circuit IC1 is succeeded an end of electrical equipment K2 coil, and the other end of relay K 2 coils links to each other with circuit ground GND; Circuit anode VCC succeeds the moving contact among the electrical equipment K1 normally opened contact K1-2, and the fixed contact among the normally opened contact K1-2 meets the public pin COM1 among the double-point double-throw switch S1-1.

Two lead-out terminals of Electret condenser microphone respectively and connect the microphone cord in the landline telephone cleaner handgrip.

Description of drawings

Accompanying drawing 1 is an embodiment circuit working of a long-range landline telephone monitor provided by the invention schematic diagram.

Embodiment

Specification requirement according to the components and parts of the circuit working schematic diagram of the long-range landline telephone monitor shown in the accompanying drawing 1 and description of drawings and the following stated is implemented, and can realize the present invention.

The selection of components and parts and technical parameter thereof

IC1 is a time-base integrated circuit, and the model that present embodiment uses is NE555;

VS is an one-way SCR, the optional MCR100-6 of model;

D1 is a rectifier diode, for reducing the pressure drop that produces because of rectification, should select the germanium diode of 2AP10 class;

Diode D2 is that protective circuit is established, and can select the rectifier diode of silicon materials for use, as: 1N4001;

LED is a red light emitting diodes, is used for the off hook state indication;

MIC is a microphone, should select the Electret condenser microphone of two lead-out terminals for use;

The resistance of resistance R 1 is 1.2K Ω, and the resistance of potentiometer RP is 2.2M Ω;

C1 is an electrochemical capacitor, and its capacity is 220 μ F;

Relay K 1 is used 2 groups of normally opened contact K1-1, K1-2, and model is JRXB-1;

Relay K 2 is used 1 group of normally-closed contact, and the model of selecting for use is HG4098;

Double-point double-throw switch is combined by 2 groups of synchronous single-pole double-throw switch (SPDT)s, that is: S1-1, S1-2 are used for the break-make of external 12V DC power supply of Synchronization Control and boombox;

The 12V DC power supply can be selected the 12V stabilized voltage power supply for use, or selects common 12V rectifier power source for use.

Circuit production method and circuit debugging

The circuit of long-range landline telephone monitor can directly be fixed on the inside of telephone set; A ￠ 3mm aperture is bored in appropriate location in telephone set front or side; An Electret condenser microphone MIC inside is installed; Two lead-out terminals of Electret condenser microphone are connected on the microphone cord parallel connection in the Telephone handset respectively; The normally opened contact K1-1 of relay K 1 is connected in parallel on 2 contacts of hook switch of telephone set, and 1 double-point double-throw switch is installed in the telephone set side, is used for the through and off of external 12V DC power supply of Synchronization Control and boombox;

If need to prolong the listening period after the dialing at every turn, can increase the resistance of potentiometer RP through adjustment, or suitably increase the capacity of electrochemical capacitor C1.

Claims

1. a long-range landline telephone monitor comprises fixed telephone, double-point double-throw switch, Electret condenser microphone, 12V DC power supply, one-way SCR control and circuits for triggering, time-delay and control circuit composition, it is characterized in that:

Public pin COM1 among the double-point double-throw switch S1-1 succeeds fixed contact and the fixed contact among the relay K 2 normally-closed contact K2-1 among the electrical equipment K1 normally opened contact K1-1; The ON1 termination 12V dc power anode of double-point double-throw switch S1-1; Public pin COM2 connects the end of loud speaker BL among the double-point double-throw switch S1-2; The other end of loud speaker BL answer the call an end and the circuit ground GND of power ringing output; Other 2 pin connect OFF2 end and ON2 end respectively among the double-point double-throw switch S1-2, the OFF2 end of another termination double-pole double throw switch S1-2 of ringing telephone stations output and the positive pole of germanium diode D1;

The negative pole order of germanium diode D1 is to the control utmost point of controllable silicon VS in one-way SCR control and the circuits for triggering thereof; The anode of one-way SCR VS is succeeded an end of electrical equipment K1 coil; The moving contact of another relay termination K2 normally-closed contact K2-1 of relay K 1 coil, the negative electrode connection circuit ground GND of one-way SCR VS;

Time-delay and control circuit are made up of time-base circuit IC1, timing capacitor C1, potentiometer RP, relay K 2; The model that time-base circuit IC1 adopts is NE555; The 2nd pin of time-base circuit IC1 and the 6th pin connect the negative pole of timing capacitor C1, the end of potentiometer RP; The 1st pin connection circuit ground GND of the other end of potentiometer RP and lever arm thereof and time-base circuit IC1; The anodal VCC of the 4th pin of the positive pole of timing capacitor C1 and time-base circuit IC1 and the 8th pin connection circuit, the 3rd pin of time-base circuit IC1 is succeeded an end of electrical equipment K2 coil, and the other end of relay K 2 coils links to each other with circuit ground GND; Circuit anode VCC succeeds the moving contact among the electrical equipment K1 normally opened contact K1-2, and the fixed contact among the normally opened contact K1-2 meets the public pin COM1 among the double-point double-throw switch S1-1.

2. long-range landline telephone monitor according to claim 1 is characterized in that: two lead-out terminals of Electret condenser microphone respectively and connect the microphone cord in the landline telephone cleaner handgrip.