CN2128808Y - Duplex wire intercom machine - Google Patents
Duplex wire intercom machine Download PDFInfo
- Publication number
- CN2128808Y CN2128808Y CN 92222312 CN92222312U CN2128808Y CN 2128808 Y CN2128808 Y CN 2128808Y CN 92222312 CN92222312 CN 92222312 CN 92222312 U CN92222312 U CN 92222312U CN 2128808 Y CN2128808 Y CN 2128808Y
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- CN
- China
- Prior art keywords
- input
- amplifier
- terminal
- resistance
- receiver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
The utility model discloses a novelduplex wire intercom machine, a speaker and a loudspeaker are arranged in the same shell. The utility model is characterized in that the duplex wire intercom machine is provided with an electronic shutter, a controllable end of the electronic shutter is in parallel connection with the loudspeaker, and a controlled end is in parallel connection with an input the of an amplifier. When the signal of the input end reaches a certain value, the controlled end is leaded through in order to make the input end of the amplifier short circuit. The utility model is also provided with a loudspeaker line transformer, the two input ends are respectively connected with an input terminal and a shared terminal on the shell in order to form sending and receiving independent channels, and an output end is in parallel connection with a shared end of the loudspeaker and the electronic shutter. The utility model has the advantages of convenient operation, high quality, simple structure, low cost and long transmission distance.
Description
The utility model relates to a kind of structure of duplex wired intercom.
General wire intercommunication all has a microphone; An amplifier, this amplifier input terminal is connected with microphone; A line transformer, its input is connected with the output of amplifier, input, the output of two output termination intercom; A receiver by a key switch, connects input, the output of intercom.The main weak point of this class intercom is: send words, will switch at any time by words, use inconvenience, transmission range is nearer, and noise is bigger.
Task of the present utility model provides a kind of technical scheme of duplex wired intercom.It can realize being subjected to, sending words to carry out simultaneously, and is easy to use; Transmission range is far away, and transmission quality is higher.
In order to solve above-mentioned task, scheme of the present utility model is: comprise a microphone 1 in the casing, place in the casing; An amplifier 2, its input answer the tube output; A line transformer 3, the output of its input termination amplifier, two output meet sb. at the airport lead-out terminal 4 and 5, one receivers 6 of common terminal on the shell place in the casing; An electronic switching device 7, its controlled end and transmitter also connect; A receiver line transformer 9, two input meet sb. at the airport respectively input terminal 8 and common terminal on the shell, its output is connected to the controlled end two ends of receiver and electronic switching device.When the signal of the controlled end of electronic switching device reaches certain value (conducting voltage of electronic switch), connect the controlled terminal conducting of the electronic switch of amplifier in, make amplifier input short circuit, thereby suppressed the feedback of sound.Give, the receiver channel is independent separately, improved communication quality.
Electronic switching device of the present utility model comprises: a transistor BG2, and base stage connects receiver by resistance R 9, connects power supply by resistance R 8; Collector electrode connects power supply by resistance R 7, and emitter connects common terminal by capacitor C 13.A transistor BG1, base stage connects the emitter of transistor BG2, and collector electrode connects amplifier input terminal, and emitter connects common terminal.
Owing to adopt above-mentioned solution, major advantage of the present utility model is, transmitter and receiver combine in the same shell, and sending and receiving are talked about and can be carried out simultaneously; Automatically sound-inhibiting feeds back, and speech is clear; Simple in structure, the reliability height.
The drawing of accompanying drawing is described as follows:
Fig. 1 is an outline drawing of the present utility model;
Fig. 2 is the utility model external form elevational schematic view;
Fig. 3 is a circuit block diagram of the present utility model;
Fig. 4 is an embodiment circuit diagram of the present utility model.
The utility model is described in further detail below in conjunction with drawings and Examples: in Fig. 4, capacitor C 10 is connected with capacitor C 9 with resistance R 5 backs in parallel and is constituted audio compensator, and this audio compensator is serially connected with between microphone and the amplifier.
In an embodiment, also have one by music-integrating block YY, the music generator that capacitor C 8 and C12, resistance R 4 and R6, potentiometer W1 and key switch K1 form is connected between the defeated end and common terminal of amplifier.
Among the embodiment, receiver is a loud speaker, W2 receives the potentiometer of sound size for control, the amplifier of embodiment is by integrated package TDA2822, capacitor C 14, C15, C16, C17, C18, C19, C20, resistance R 11, R12, R13, R14, R15 constitute, and the pin 7 of integrated package TDA2822 be an amplifier input terminal, and the pin 3 of integrated package TDA2822 is connected with capacitor C 19 afterwards as the output of amplifier.The power supply of embodiment is by source switch K, transformer B, silicon stack D1, luminous tube D2, capacitor C 1, C2, C3, C4, C5, C6, resistance R 1, and integrated package 7809 constitutes.Resistance R 2, R3, capacitor C 7, C11 constitute the biasing circuit of microphone.
Claims (4)
1, a kind of duplex wired intercom comprises: a casing; A microphone places in the casing; An amplifier, its input answer the tube output; A line transformer, the output of its input termination amplifier, two output meet sb. at the airport respectively lead-out terminal and common terminal on the shell; A receiver places in the casing; It is characterized in that: an electronic switching device, its controlled end and receiver also connect, and its controlled terminal and amplifier input terminal also connect, and when the signal of input reached certain value, the controlled terminal conducting made amplifier input short circuit; A receiver line transformer, two input meet sb. at the airport respectively input terminal and common terminal on the shell, its output is connected to the input of receiver and electronic switching device.
2, according to the described duplex wired intercom of claim 1, it is characterized in that: electronic switching device comprises: a transistor BG2, its base stage connects receiver by resistance R 9, connect power supply by resistance R 8, its collector electrode connects power supply by resistance R 7, and its emitter connects common terminal by capacitor C 13; A transistor BG1, its base stage connects the emitter of transistor BG2, and its collector electrode connects amplifier input terminal, and its emitter connects common terminal.
3, according to claim 1 or 2 described duplex wired intercoms, it is characterized in that: one is serially connected with between microphone and the amplifier by capacitor C 10 and the resistance R 5 backs in parallel audio compensation that constitute of connecting with capacitor C 9.
4, according to claim 1,2 or 3 described duplex wired intercoms, it is characterized in that being connected to the music generator formed by music-integrating block YY, capacitor C 8 and C12, resistance R 4 and R6, potentiometer W1 and key switch K1 by one between amplifier input terminal and the common terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92222312 CN2128808Y (en) | 1992-05-25 | 1992-05-25 | Duplex wire intercom machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92222312 CN2128808Y (en) | 1992-05-25 | 1992-05-25 | Duplex wire intercom machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2128808Y true CN2128808Y (en) | 1993-03-24 |
Family
ID=33768792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92222312 Expired - Fee Related CN2128808Y (en) | 1992-05-25 | 1992-05-25 | Duplex wire intercom machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2128808Y (en) |
-
1992
- 1992-05-25 CN CN 92222312 patent/CN2128808Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |