CN2379974Y

CN2379974Y - Wired, duplex and sound enlarged type mutual talking telephone extension set

Info

Publication number: CN2379974Y
Application number: CN 99233542
Authority: CN
Inventors: 邓振安
Original assignee: DENG ZHEN AN
Current assignee: DENG ZHEN AN
Priority date: 1999-06-12
Filing date: 1999-06-12
Publication date: 2000-05-24
Anticipated expiration: 2009-06-12

Abstract

The utility model relates to a wired, duplex and sound enlarged type intercommunication telephone extension set, which is composed of a power regulating circuit, a microphone circuit, a microphone amplifier, an output circuit, a bridge circuit, and capacitors C1, C2. The utility model has the advantages of novel design, simple structure, practicality, high reliability, low cost, large volume for communication, clear speech, strong anti-interference ability. The utility model also has the advantages that the utility model has nothing to do with the polarity of external lines in connection; the utility model provides convenience for connection; the bridge circuit has attenuation to audio signals; the communication of telephone extension sets and central telephone sets becomes convenient. The utility model is especially suitable for being used at the place with large environmental noise and strong line interference.

Description

Wired duplex intercommunication telephone extension set that amplifies

The utility model relates to the extension that a kind of band send the words amplifier, relates in particular to a kind of wired duplex intercommunication telephone extension set that amplifies.

Present wired duplex of generally using intercommunication telephone extension set that amplifies, all unresolved outside line is connected nonpolarity requirement, cause the user when extension is connected with outside line, whether must differentiate phone be connected polarity with outside line correct in advance, the probability of repetitive operation is 50%, like this, bring very large inconvenience when open-air work high above the ground (especially) to the user

The purpose of this utility model is to remedy the deficiencies in the prior art, proposes a kind of and wired duplex of the applicant matching used irrelevant wired duplex of the polarity intercommunication telephone extension set that amplifies that is connected with outside line of intercommunication telephone exchange that amplifies.

The purpose of this utility model is achieved by the following technical programs, this wired duplex intercommunication telephone extension set that amplifies, comprise power supply regulator circuit, transmitter circuit, send words amplifier, output circuit, it is characterized in that: between power circuit and outside line binding post, be connected with a bridge circuit, between output circuit and outside line binding post, be connected with capacitor.

The utility model modern design, simple in structure, practical reliable, with low cost, In Call is big, and sound is clear, antijamming capability is strong, and irrelevant with outer circuit polarity, the convenient connection, bridge circuit is undamped to audio signal, make things convenient for the contact of extension set and exchange, it is big at environmental noise to suit especially, and circuit disturbs strong occasion to use, and also can be widely used in the contact between each section office and the section office.

Accompanying drawing is circuit theory diagrams of the present utility model.

Below in conjunction with embodiment, and the contrast accompanying drawing is made an explanation to the utility model.

Wired duplex of embodiment intercommunication telephone extension set that amplifies, it comprises power supply regulator circuit 1, transmitter circuit 2, send words amplifier 3, output circuit 4, bridge circuit 5 and capacitor C ₁, C ₂Form, when external power supply is L ₁ ⁺, L ₂ ^-The time, power supply is through L ₁→ D ₂→ Q ₁→ Q ₂→ IC → K → D ₄→ L ₂Constitute path, just forming, descending negative voltage on the IC.And work as external power supply is L ₂ ⁺, L ₁ ^-The time, power supply is through L ₂→ D ₃→ Q ₁→ Q ₂→ IC → K → D ₁→ L ₁Constitute path, also just forming on the IC, descending negative voltage, thereby make the polarity of extension set work and external circuit irrelevant.Again because capacitor C ₁, C ₂Isolated DC, logical audio frequency makes audio signal be added to outside line through bridge circuit, has exempted the decay of bridge circuit to audio signal, has also exempted the short circuit of output transformer to the outside line DC component, makes extension set and exchange normal talking.

Operation principle of the present utility model is: extension set binding post L ₁, L ₂After external circuit is connected, connect K switch, at this moment extension set can be got in touch with exchange, and when extension set sent words, the voice signal voltage that transmitter DM picks up was exported through C by transformer T after sending the amplification of words amplifier ₁, C ₂Deliver to binding post L ₁, L ₂Via line is passed to exchange, at this moment, and Q ₂Saturation conduction.When extension set was talked about, exchange signal one tunnel was through C ₁, C ₂Deliver to extension set transformer T and directly promote loud speaker BL sounding; Another road is added to Exgt Bat extension battery through bridge circuit and adjusts circuit, because the exchange signal is very strong, audio frequency voice signal voltage is greater than 10 volts, cause Q2 to end, send the words amplifier to lose the job voltage and be in off position thereby make, prevented the sound of being talked about that loud speaker BL sends effectively, entered through extension set microphone DM again and send the talking path.Finished by words, send the words amplifier to recover enlarging function again, guarantee to realize the duplex conversation between extension set and the exchange.

Claims

1, a kind of wired duplex intercommunication telephone extension set that amplifies, comprise power supply regulator circuit, transmitter circuit, send the words amplifier, it is characterized in that: between power circuit and outside line binding post, be connected with a bridge circuit, between output circuit and outside line binding post, be connected with capacitor.

2, wired duplex according to claim 1 intercommunication telephone extension set that amplifies, it is characterized in that: bridge circuit is made up of four diodes.

3, wired duplex according to claim 1 intercommunication telephone extension set that amplifies, it is characterized in that: capacitors in series is at output circuit transformer T secondary winding two tap terminals.