CN104581518A - High-sensitivity sound pick-up circuit for communication equipment - Google Patents
High-sensitivity sound pick-up circuit for communication equipment Download PDFInfo
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- CN104581518A CN104581518A CN201310493624.7A CN201310493624A CN104581518A CN 104581518 A CN104581518 A CN 104581518A CN 201310493624 A CN201310493624 A CN 201310493624A CN 104581518 A CN104581518 A CN 104581518A
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Abstract
The invention discloses a high-sensitivity sound pick-up circuit for communication equipment. The high-sensitivity sound pick-up circuit comprises a direct-current power supply, an audio acquisition circuit, a primary audio amplifying circuit, a secondary audio amplifying circuit and a headset. Sound in a certain direction is received by a microphone, filtered by a first capacitor, a second capacitor and a fourth capacitor, subjected to current limiting by a first resistor and a fourth resistor, and then fed into the primary audio signal amplifying circuit to be amplified to have a gain factor of 100; after being filtered by the third capacitor and subjected to current limiting by a sixth resistor, an output signal is fed into the secondary audio signal amplifier to be amplified to have a gain factor of 500; after being filtered by the fifth capacitor, the output signal is fed into the headset. Due to high amplifying power, a very weak sound signal can be easily amplified and output from the headset. Compared with the prior art, the high-sensitivity sound pick-up circuit has the advantages of simple circuit structure, low cost, few electronic elements and convenience in mounting, and has popularization and application values.
Description
Technical field
The present invention relates to a kind of communication apparatus circuit, particularly relate to a kind of high sensitivity pick-up circuit for communication apparatus.
Background technology
Communication apparatus is divided into wire communication equipment and wireless telecommunications system.Wire communication equipment mainly introduces the conversion equipment solved between the serial communication of industry spot, the communication of professional bus-type, the communication of Industrial Ethernet and various communications protocol.Wireless telecommunications system is the equipment such as wireless aps, wireless bridge, wireless network card, wireless lightning arrester, antenna mainly.And circuit structure for the pick-up of communication apparatus in prior art is complicated, cost is high, volume is large, is unfavorable for installation.
Summary of the invention
Object of the present invention is just to provide a kind of high sensitivity pick-up circuit for communication apparatus to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention includes DC power supply, audio collection circuit, one-level audio amplifier circuit, secondary audio amplifying circuit and earphone, described audio collection circuit comprises microphone, first resistance, second resistance, 3rd resistance, 4th resistance, first electric capacity, 4th electric capacity and the second electric capacity, the first end of described first resistance simultaneously with the first end of described second electric capacity, the first end of described second resistance is connected with the positive pole of described DC power supply, second end of described first resistance is connected with the first end of described first electric capacity and one end of described microphone simultaneously, second end of described second electric capacity is connected with the second end of described first electric capacity and the first end of described 4th resistance simultaneously, second end of described second resistance simultaneously with the first end of described 3rd resistance, the first end of described 4th electric capacity is connected with the positive signal input of described one-level audio amplifier circuit, the other end of described microphone simultaneously with the second end of described 3rd resistance, second end of described 4th electric capacity is connected with the negative pole of described DC power supply, second end of described 4th resistance is connected with the negative signal input of described one-level audio amplifier circuit, described one-level audio amplifier circuit comprises the first operational amplifier, 5th resistance, 6th resistance and the 3rd electric capacity, the negative signal input of described first operational amplifier is connected with the negative signal output of described audio collection circuit and the first end of described 5th resistance simultaneously, second end of described 5th resistance is connected with the signal output part of described first operational amplifier and the first end of described 3rd electric capacity simultaneously, second end of described 3rd electric capacity is connected with the first end of described 6th resistance, second end of described 6th resistance is connected with the negative signal input of described secondary audio amplifying circuit, the positive signal input of described first operational amplifier is also connected with the positive signal input of described secondary audio amplifying circuit, described secondary audio signal amplification circuit comprises the second operational amplifier, 7th resistance and the 5th resistance, the negative signal input of described second operational amplifier is connected with the negative signal output of described one-level audio amplifier circuit and the first end of described 7th resistance simultaneously, the positive signal input of described second operational amplifier is connected with the positive signal output of described one-level audio amplifier circuit, the signal output part of described second operational amplifier is connected with the second end of described 7th resistance and the first end of described 5th electric capacity simultaneously, second end of described 5th electric capacity is connected with one end of described earphone, the other end of described earphone is connected with the negative pole of described DC power supply, the signal output part of described audio collection circuit is connected with the signal input part of described one-level audio amplifier circuit, signal output part that is described and audio amplifier circuit is connected with the signal input part of described secondary audio amplifying circuit, the signal output part of described second amplifying circuit is connected with described earphone.
Beneficial effect of the present invention is:
The present invention is a kind of high sensitivity pick-up circuit for communication apparatus, and compared with prior art, the present invention has the advantage that circuit structure is simple, with low cost, employing electronic component is few, be beneficial to installation, has the value promoted and use.
Accompanying drawing explanation
Fig. 1 is circuit structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1: the present invention includes DC power supply, audio collection circuit, one-level audio amplifier circuit, secondary audio amplifying circuit and earphone, audio collection circuit comprises microphone MIC, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, first electric capacity C1, 4th electric capacity C4 and the second electric capacity C2, the first end of the first resistance R1 simultaneously with the first end of the second electric capacity C2, the first end of the second resistance R2 is connected with the positive pole of DC power supply, second end of the first resistance R1 is connected with the first end of the first electric capacity C1 and one end of microphone MIC simultaneously, second end of the second electric capacity C2 is connected with second end of the first electric capacity C1 and the first end of the 4th resistance R4 simultaneously, second end of the second resistance R2 simultaneously with the first end of the 3rd resistance R3, the first end of the 4th electric capacity C4 is connected with the positive signal input of one-level audio amplifier circuit, the other end of microphone MIC simultaneously with second end of the 3rd resistance R3, second end of the 4th electric capacity C4 is connected with the negative pole of DC power supply.One-level audio amplifier circuit comprises the first operational amplifier IC1, the 5th resistance R5, the 6th resistance R6 and the 3rd electric capacity C3, the negative signal input of the first operational amplifier IC1 is connected with second end of the 4th resistance R4 and the first end of the 5th resistance R5 simultaneously, second end of the 5th resistance R5 is connected with the signal output part of the first operational amplifier IC1 and the first end of the 3rd electric capacity C3 simultaneously, and second end of the 3rd electric capacity C3 is connected with the first end of the 6th resistance R6.Secondary audio signal amplification circuit comprises the second operational amplifier IC2, 7th resistance R7 and the 5th resistance R5, the negative signal input of the second operational amplifier IC2 is connected with second end of the 6th resistance R6 and the first end of the 7th resistance R7 simultaneously, the positive signal input of the second operational amplifier IC2 is connected with the positive signal output of the first operational amplifier IC1, the signal output part of the second operational amplifier IC2 is connected with second end of the 7th resistance R7 and the first end of the 5th electric capacity C5 simultaneously, second end of the 5th electric capacity C5 is connected with one end of earphone SP, the other end of earphone SP is connected with the negative pole of DC power supply.
As shown in Figure 1: the acoustic reception on certain orientation is got off (sound in other directions is suppressed) by microphone MIC, through the first electric capacity C1, the second electric capacity C2 and the 4th electric capacity C4 filtering, the amplification quantity having 110 times of gains after one-level amplifier circuit for sound frequency signal amplifies is sent into after first resistance R1 and the 4th resistance R4 current limliting, output signal by the amplification quantity having 500 times of gains after sending into secondary audio signal amplifier after the 3rd electric capacity C3 filtering after the 6th resistance R6 current limliting, output signal and send into earphone SP by after the 5th electric capacity C5 filtering.Amplifying power high is like this enough to atomic weak voice signal to amplify, and is exported by earphone SP.
Claims (1)
1. the high sensitivity pick-up circuit for communication apparatus, it is characterized in that: comprise DC power supply, audio collection circuit, one-level audio amplifier circuit, secondary audio amplifying circuit and earphone, described audio collection circuit comprises microphone, first resistance, second resistance, 3rd resistance, 4th resistance, first electric capacity, 4th electric capacity and the second electric capacity, the first end of described first resistance simultaneously with the first end of described second electric capacity, the first end of described second resistance is connected with the positive pole of described DC power supply, second end of described first resistance is connected with the first end of described first electric capacity and one end of described microphone simultaneously, second end of described second electric capacity is connected with the second end of described first electric capacity and the first end of described 4th resistance simultaneously, second end of described second resistance simultaneously with the first end of described 3rd resistance, the first end of described 4th electric capacity is connected with the positive signal input of described one-level audio amplifier circuit, the other end of described microphone simultaneously with the second end of described 3rd resistance, second end of described 4th electric capacity is connected with the negative pole of described DC power supply, second end of described 4th resistance is connected with the negative signal input of described one-level audio amplifier circuit, described one-level audio amplifier circuit comprises the first operational amplifier, 5th resistance, 6th resistance and the 3rd electric capacity, the negative signal input of described first operational amplifier is connected with the negative signal output of described audio collection circuit and the first end of described 5th resistance simultaneously, second end of described 5th resistance is connected with the signal output part of described first operational amplifier and the first end of described 3rd electric capacity simultaneously, second end of described 3rd electric capacity is connected with the first end of described 6th resistance, second end of described 6th resistance is connected with the negative signal input of described secondary audio amplifying circuit, the positive signal input of described first operational amplifier is also connected with the positive signal input of described secondary audio amplifying circuit, described secondary audio signal amplification circuit comprises the second operational amplifier, 7th resistance and the 5th resistance, the negative signal input of described second operational amplifier is connected with the negative signal output of described one-level audio amplifier circuit and the first end of described 7th resistance simultaneously, the positive signal input of described second operational amplifier is connected with the positive signal output of described one-level audio amplifier circuit, the signal output part of described second operational amplifier is connected with the second end of described 7th resistance and the first end of described 5th electric capacity simultaneously, second end of described 5th electric capacity is connected with one end of described earphone, the other end of described earphone is connected with the negative pole of described DC power supply, the signal output part of described audio collection circuit is connected with the signal input part of described one-level audio amplifier circuit, signal output part that is described and audio amplifier circuit is connected with the signal input part of described secondary audio amplifying circuit, the signal output part of described second amplifying circuit is connected with described earphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310493624.7A CN104581518A (en) | 2013-10-21 | 2013-10-21 | High-sensitivity sound pick-up circuit for communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310493624.7A CN104581518A (en) | 2013-10-21 | 2013-10-21 | High-sensitivity sound pick-up circuit for communication equipment |
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| Publication Number | Publication Date |
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| CN104581518A true CN104581518A (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310493624.7A Pending CN104581518A (en) | 2013-10-21 | 2013-10-21 | High-sensitivity sound pick-up circuit for communication equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109000928A (en) * | 2018-07-19 | 2018-12-14 | 广州市楚佰环保科技有限公司 | A kind of detection method of automobile engine operation |
-
2013
- 2013-10-21 CN CN201310493624.7A patent/CN104581518A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109000928A (en) * | 2018-07-19 | 2018-12-14 | 广州市楚佰环保科技有限公司 | A kind of detection method of automobile engine operation |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |
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| WD01 | Invention patent application deemed withdrawn after publication |